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WHEEL TRACTOR-SCRAPERS
TOWED SCRAPERS
CONTENTS
WHEEL TRACTOR-SCRAPERS
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-2
Specifications:
Standard Scrapers . . . . . . . . . . . . . . . . . . . . .8-3
Tandem Powered and Push-Pull Scrapers . . .8-4
Elevating Scraper . . . . . . . . . . . . . . . . . . . . . .8-6
Coal Bowl Wheel Tractor-Scrapers . . . . . . . .8-7
Ground Engaging Tools:
Router Bits . . . . . . . . . . . . . . . . . . . . . . . . . . .8-8
Cutting Edges . . . . . . . . . . . . . . . . . . . . . . . . .8-8
Bowl Side Protectors . . . . . . . . . . . . . . . . . . . .8-9
Elevating Scraper . . . . . . . . . . . . . . . . . . . . .8-10
Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-10
Material Application Guide . . . . . . . . . . . . .8-11
Push-Load TTT Match . . . . . . . . . . . . . . . . .8-11
Tire Options, All Models . . . . . . . . . . . . . . . . . .8-12
Cushion Hitch . . . . . . . . . . . . . . . . . . . . . . . . . .8-13
Wheel Tractor-Scraper Anatomy . . . . . . . . . . .8-13
Use of Rimpull-Speed-Gradeability Curves . .8-14
Use of Travel Time Charts . . . . . . . . . . . . . . . .8-16
Fixed Times for Scrapers . . . . . . . . . . . . . . . . .8-17
Use of Retarder Curves . . . . . . . . . . . . . . . . . .8-17
Curves/Charts:
621G Rimpull, Retarding, Travel Times . . .8-19
623G Rimpull, Retarding, Travel Times . . .8-23
627G Rimpull, Retarding, Travel Times . . .8-27
631G Rimpull, Retarding, Travel Times . . .8-31
637G Rimpull, Retarding, Travel Times . . .8-35
657G Rimpull, Retarding, Travel Times . . .8-39
TOWED SCRAPERS
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
Recommended Pull Units . . . . . . . . . . . . . . . . .8-43
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .8-44
8
Edition 41
8-1
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Page 2
Features
Features:
● VHP engines that deliver 10% more horsepower
in gears 3 through 8 in the 620, 630 and 650 G Series.
● Controlled throttle shifting improves power
train life by reducing fuel injection rate just prior
to shifting in the 620, 630 and 650 G Series.
● G Series rear engines can be started from the cab.
Tachometer can monitor either front or rear engine.
● G Series Scrapers EMS information can be
viewed in the cab by pressing a tractor/scraper
switch. If EMS senses a fault in the scraper, it will
automatically switch from tractor to scraper.
● HEUI and (EUI) Electronic Unit Injection
electronically maintains fuel settings as well as
automatically derate for altitude and air filter
restrictions.
● Eight speed semi-automatic power shift transmissions used in the 620, 630, and 650 G Series.
● Hydraulic retarder protects engine from over
speeding and extends brake life on grades in the
620, 630 and 650 G Series.
● Cushion Hitch on 620, 630, and 650 G Series
absorbs haul road shocks, prevents loping as well
as promotes operator comfort.
● G Series implement valve has been relocated to
the scraper for improved serviceability on the 620,
630, and 650 G Series.
● Electro-hydraulic implement controls replace
cab pilot valve and associated lines in the 620, 630,
and 650 G Series.
● Joystick implement control — bowl, apron,
ejector, elevator, transmission hold, cushion hitch,
and optional bail are controlled by a joystick in
the 620, 630, and 650 G Series.
● Simplified transmission control on 620, 630,
and 650 G Series. Gear selection choices are 1, 2,
and D. Operator can override transmission by
manually selecting top gear.
8-2
Edition 41
● Differential lock connects both tractor drive wheels
in poor underfoot conditions for positive traction.
Tandem Powered:
● Push-Pull arrangement allows tandem engine
scrapers to assist one another in loading. Recommended for high production applications.
Elevating:
● Infinitely variable elevator speed on 623G.
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Specifications
● Standard Scrapers
MODEL
Flywheel Power
Approx. Operating Weight (Empty)
Scraper Capacity: Struck
Scraper Capacity: Heaped
Rated Load
Weight Distribution — Empty:
Drive
Rear
Weight Distribution — Loaded:
Drive
Rear
Engine Model
Rated Engine RPM
Displacement
Top Speed (Loaded)
180° Curb-to-Curb Turning Width
Tires — Tractor Drive
Tires — Scraper
Width of Cut
Maximum Depth of Cut
Maximum Depth of Spread
Fuel Tank Refill Capacity
GENERAL DIMENSIONS:
Height to Top of Scraper
Wheelbase
Overall Length
Overall Width
Shipping Width
(Draft Arm on Inside of Bowl)
Scraper Tread
Tractor Tread
Wheel Tractor-Scrapers
621G
246/272 kW
33 995 kg
12 m3
17 m3
23 950 kg
631G
330/365 hp
74,946 lb
15.7 yd3
22 yd3
52,800 lb
345/373 kW
47 628 kg
18.3 m3
26 m3
37 013 kg
462/500 hp
105,002 lb
24 yd3
34 yd3
81,600 lb
67%
33%
64%
36%
52%
48%
C15 ACERT
1800
52%
48%
C18 ACERT
1800
15.2 L
928 in3
51 km/h
32 mph
11.7 m
38'5"
33.25R29##E3
33.25R29##E3
3.02 m
9'11"
333 mm
13.1"
522 mm
20.6"
606 L
160 U.S. gal
18.1 L
1105 in3
53 km/h
33 mph
12.2 m
40'1"
37.25R35##E3
37.25R35##E3
3.51 m
11'6"
437 mm
17.2"
480 mm
18.9"
814 L
215 U.S. gal
3.71 m
7.72 m
12.88 m
3.58 m
12'2"
25'4"
42'3"
11'9"
3.86 m
8.77 m
14.71 m
3.94 m
7'4"
7'3"
3.63 m
2.46 m
2.46 m
—
2.23 m
2.20 m
**
*
8
12'8"
28'9"
48'3"
12'11"
11'11"
8'1"
8'1"
**Optional Shipping Configuration.
**Standard Shipping Configuration.
Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator.
Single Engine Open Bowl
The Open Bowl Wheel Tractor-Scraper is available as a self-loading or push-loaded hauling system with a broad material
appetite. The broad material appetite allows the Open Bowl Wheel Tractor-Scraper to be used in general construction, heavy construction, mining, and waste applications.
Open Bowl Advantages:
● Quick load/unload
● Spread evenly on-the-go
● Broad material appetite
● Aids in compaction
● Varying material conditions
● High production
Single Engine Advantages
(Compared to Tandem Engine):
● Low fuel usage
● Lower gross vehicle weight
● Loads quickly with the aid of a Track-Type Tractor and hauls
to fill carrying minimum machine weight
Edition 41
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PUSH-PULL GENERAL DIMENSIONS:
Operating Weight (Empty)
Overall Length
Weight Distribution — Empty: Front
Weight Distribution — Empty: Rear
Weight Distribution — Loaded: Front
Weight Distribution — Loaded: Rear
Page 4
Specifications
● Tandem Powered
● Push-Pull
MODEL
Flywheel Power: Tractor
Flywheel Power: Scraper
Approx. Operating Weight (Empty)
Scraper Capacity: Struck
Scraper Capacity: Heaped
Rated Load
Weight Distribution — Empty: Front
Weight Distribution — Empty: Rear
Weight Distribution — Loaded: Front
Weight Distribution — Loaded: Rear
Engine Model: Tractor
Engine Model: Scraper
Rated Engine RPM: Tractor
Rated Engine RPM: Scraper
Displacement: Tractor
Displacement: Scraper
Top Speed (Loaded)
180° Curb-to-Curb Turning Width
Tires — Tractor Drive
Tires — Scraper
Width of Cut
Maximum Depth of Cut
Maximum Depth of Spread
Fuel Tank Refill Capacity: Tractor
Fuel Tank Refill Capacity: Scraper
GENERAL DIMENSIONS:
Height to Top of Scraper
Wheelbase
Overall Length
Overall Width
Shipping Width
(Draft Arm on Inside of Bowl)
Scraper Tread
Tractor Tread
1:57 PM
627G
246/272 kW
178/198 kW
37 922 kg
12 m3
17 m3
23 950 kg
637G
330/365 hp
239/266 hp
83,604 lb
15.7 yd3
22 yd3
52,800 lb
345/373 kW
198/211 kW
51 963 kg
18.3 m3
26 m3
37 013 kg
Edition 41
421/447 kW
306/337 kW
68 384 kg
24.5 m3
33.6 m3
47 174 kg
564/600 hp
410/451 hp
150,760 lb
32 yd3
44 yd3
104,000 lb
59%
41%
50%
50%
C15 ACERT
C9 ACERT
1800
2000
15.2 L
928 in3
8.8 L
538 in3
51 km/h
32 mph
11.7 m
38'5"
33.25R29##E3
33.25R29##E3
3.02 m
9'11"
333 mm
13.1"
522 mm
20.6"
—
1105 L
292 U.S. gal
59%
41%
50%
50%
C18 ACERT
C9 ACERT
1800
2000
18.1 L
1105 in3
8.8 L
538 in3
53 km/h
33 mph
12.2 m
40'1"
37.25R35##E3
37.25R35##E3
3.51 m
11'6"
437 mm
17"
480 mm
18.9"
—
1268 L
335 U.S. gal
58%
42%
50%
50%
C18 ACERT
C15 ACERT
1800
1800
18.1 L
1105 in3
15.2 L
928 in3
53 km/h
33 mph
14.2 m
46'7"
40.5/75R39##E3
40.5/75R39##E3
3.85 m
12'8"
440 mm
17.3"
660 mm
26"
—
1597 L
424 U.S. gal
3.81 m
7.72 m
12.88 m
3.58 m
12'6"
25'4"
42'3"
11'9"
4.18 m
8.77 m
14.71 m
3.94 m
13'9"
28'9"
48'3"
12'11"
4.62 m
9.96 m
16.2 m
4.35 m
2.23 m
2.20 m
7'4"
7'3"
3.63 m
2.46 m
2.46 m
11'11"
8'1"
8'1"
3.91 m
2.81 m
2.63 m
39 443 kg
15.2 m
86,957 lb
49'7"
54 057 kg
16.64 m
119,175 lb
54'7"
72 804 kg
18.01 m
—
59%
41%
51%
49%
**Optional Shipping Configuration.
**Standard Shipping Configuration.
Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator.
8-4
657G
462/500 hp
266/283 hp
114,559 lb
24 yd3
34 yd3
81,600 lb
**
*
60%
40%
51%
49%
15'2"
32'8"
53'1"
14'4"
**
12'10"
9'3"
8'8"
160,505 lb
59'1"
58%
42%
51%
49%
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Page 5
Specifications
● Tandem Powered
● Push-Pull
Wheel Tractor-Scrapers
Tandem Engine Open Bowl
The Open Bowl Wheel Tractor-Scraper is available as a self-loading, push-loaded, or push-pulled hauling system with a broad
material appetite. The broad material appetite allows the Open Bowl Wheel Tractor-Scraper to be used in general construction,
heavy construction, mining, and waste applications.
Open Bowl Advantages:
● Quick load/unload
● Spread evenly on-the-go
● Broad material appetite
● Aids in compaction
● High Production
● Varying material conditions
● High production
Tandem Engine Advantages
(Compared to Single Engine):
● More power for loading, traveling up grades, or over fill area
● Faster cycle times
● High rolling resistance applications
● Variable site conditions
● Poor underfoot conditions
● Steep grades
● Can be self-loaded, push loaded with the aid of a Track-Type
Tractor, or push-pulled
8
Edition 41
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Specifications
● Elevating Scraper
MODEL
Flywheel Power
Approx. Operating Weight (Empty)
Scraper Capacity: Struck
Scraper Capacity: Heaped
Rated Load
Weight Distribution — Empty:
Drive
Rear
Weight Distribution — Loaded:
Drive
Rear
Engine Model
Rated Engine RPM
Displacement
Top Speed (Loaded)
180° Curb-to-Curb Turning Width
Tires — Standard:
Tractor
Scraper
Width of Cut
Maximum Depth of Cut
Elevator Flight Spacing
Number of Flights
Maximum Floor Opening
Maximum Depth of Spread
Fuel Tank Refill Capacity
GENERAL DIMENSIONS:
Height to Top of Scraper
Wheelbase
Overall Length
Overall Width
Scraper Tread
Tractor Tread
Operating
Page 6
623G
246/272 kW
37 510 kg
13.8 m3
17.6 m3
25 038 kg
330/365 hp
82,695 lb
18 yd3
23 yd3
55,200 lb
63%
37%
52%
48%
C15 ACERT
1800
928 in3
32 mph
39'4"
15.2 L
51 km/h
12.0 m
33.25R29##E3
33.25R29##E3
3.5 m
330 mm
520 mm
11'6"
13"
20"
15
1.53 m
380 mm
606 L
5'0"
15"
160 U.S. gal
3.71 m
7.98 m
13.17 m
3.58 m
2.23 m
2.20 m
12'2"
26'2"
43'2"
11'9"
7'4"
7'3"
weight includes coolants, lubricants, full fuel tank and operator.
Elevating
The Elevating Wheel Tractor-Scraper is a self-loading hauling system with the added ability to mix/homogenize material and
do precise finishing work.
Elevating Bowl Advantages:
● Load/haul/spread with little support equipment
● Conditions material as it loads
● Capable to work as a single machine
● Aids in compaction
● Finishing work
● Low rolling resistance applications
● Short cut areas
● Favorable material types
● Windrow applications
● Thin, precise lifts
8-6
Edition 41
Single Engine Advantages
(Compared to Tandem Engine):
● Low fuel usage
● Lower gross vehicle weight
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Specifications
● Coal Bowl Wheel Tractor-Scrapers
MODEL
Flywheel Power: Tractor
Flywheel Power: Scraper
Approx. Operating Weight (Empty)
Scraper Capacity: Struck
Scraper Capacity: Heaped
Rated Load
Approx. Operating Weight (Loaded)
Top Speed (Loaded)
180° Curb-to-Curb Turning Width
GENERAL DIMENSIONS:
Height to Top of Scraper
Wheelbase
Overall Length
Overall Width
Shipping Width (Draft Arm on Inside of Bowl)
Scraper Tread
Tractor Tread
Wheel Tractor-Scrapers
637G
657G
345/373 kW
198/211 kW
54 050 kg
31 m3
38 m3
34 473 kg
88 409 kg
53 km/h
13.7 m
462/500 hp
266/283 hp
118,909 lb
41 yd3
50 yd3
76,000 lb
194,909 lb
33 mph
44'10"
421/447 kW
306/337 kW
72 190 kg
45 m3
56 m3
49 895 kg
121 933 kg
53 km/h
15.6 m
564/600 hp
410/451 hp
158,817 lb
59 yd3
73 yd3
110,000 lb
268,817 lb
33 mph
51'3"
4.18 m
9.53 m
15.47 m
3.94 m
3.63 m
2.46 m
2.46 m
13'9"
31'3"
50'9"
12'11"
11'11"
8'1"
8'1"
4.62 m
11.01 m
17.21 m
4.35 m
3.91 m
2.81 m
2.63 m
15'2"
36'1"
56'5"
14'4"
12'10"
9'3"
8'8"
**
*
**
8
**Optional Shipping Configuration.
**Standard Shipping Configuration.
Coal Bowl
Coal Bowl Wheel Tractor-Scrapers are typically used for building and maintaining coal stockpiles and hauling coal to the supply system at coal power plants. The self-loading capability, large capacity, coal pile compaction, and high speed of Coal Bowl
Wheel Tractor-Scrapers make them the tool of choice for moving coal both short and long distances. Coal Bowl Wheel TractorScrapers are available in the 637G and 657G tandem engine models.
Coal Bowl Advantages:
● Load hoppers
● Manage coal stockpiles
● Compaction reduces risk of spontaneous combustion in
coal stockpile
● Exclusively designed large capacity coal bowls
Notes:
● The 637G Coal Scraper is 736 mm (29.0") longer, the bowl
sides are 476 mm (18.7") taller, and the apron is 499 mm
(19.6") taller than its earthmoving counterpart.
● The 657G Coal Scraper is 1072 mm (42.2") longer, the
bowl sides are 1010 mm (39.8") taller, the apron is 677 mm
(26.7") taller, and the ejector is 944 mm (37.2") taller than
its earthmoving counterpart.
Edition 41
8-7
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Ground Engaging Tools
● Router Bits
● Cutting Edges
WHEEL TRACTOR-SCRAPER
GROUND ENGAGING TOOLS
ROUTER BITS
Cat router bits help prevent wear and costly damage to the scraper bowl. All router bits are forged
DH-2 steel and through-hardened to prevent breakage and prolong life.
Standard Router Bit
● Available for all models.
Heavy Duty Router Bit
● 45% more wear material than the standard router
bits.
CUTTING EDGES
Cat cutting edges are rolled from DH-2 steel and
through-hardened for strength and wear resistance
and are available in standard, abrasion resistant
material (ARM), and serrated versions.
Standard center and end-cutting edges
● For use on all scraper models (open bowl, auger
and elevating scraper).
● Used in low-to-medium abrasion and low-to-high
impact conditions.
● Available in various thicknesses and sizes for both
stinger and level-cut arrangements.
● Can be reversed or propellered for prolonged edge
use and improved cost per hour.
ARM Router Bit
● Available for virtually all models in high abrasion, low impact applications.
Level Router Bit
● Used for clean-up work and keeps material in
front of the cutting edges.
ARM center and end cutting edges
● For use on all scraper models (open bowl, auger
and elevating scraper).
● Used in medium-to-high abrasion and low-to-high
impact conditions.
● Available in various thicknesses and sizes for both
stinger and level-cut arrangements.
● Can be reversed or propellered for prolonged edge
use and improved cost per hour.
8-8
Edition 41
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Page 9
Ground Engaging Tools
● Cutting Edges
● Bowl Side Protectors
ARM serrated center cutting edge
● For use on 620, 630 and 650 Series Scraper (open
bowl, auger and elevating scraper).
● Used in medium-to-high abrasion and mediumto-high impact conditions where increased penetration and aggressive digging action is required.
Wheel Tractor-Scrapers
Special serrated cutting edges
● For site-specific applications and conditions.
● Use on 620, 630 and 650 Series Scraper (open
bowl, auger and elevating scraper).
● Available in various thicknesses and sizes for both
stinger and level-cut arrangements.
● Custom-designed edges have sharp teeth for lowto-medium abrasion and low-to-medium impact
conditions.
● Edges can be reversed or propellered around for
prolonged edge use and improved cost per hour.
BOWL SIDE PROTECTORS
8
Integrated tooth center cutting edge
● For use on 623 and 633 Elevating Scraper, and
620 Series Auger Scraper.
● Used in low-to-high abrasion conditions for improved
penetration in medium-to-high impact conditions.
● Include cast-in-place adapters, which accept pinon tips.
● Bowl Side protectors are available in two styles:
Bolt on bowl side protectors and pin on bowl side
protectors.
● Bolt on style takes a weld on adapter plate that
accepts the bolt on bowl side protector. This is
available for 620, 630 and 650 Series scrapers.
● Pin on style takes a weld on adapter plate that
accepts the pin on bowl side protector. This is available for 620, 630 and 650 Series scrapers.
Bolt-on adapters
● For use on Elevating Scraper 613, 615, 623 and 633.
● Used in low-to-high abrasion conditions and lowto-medium impact conditions when improved penetration is needed.
● Bolt-on adapters accept pin-on tips.
Edition 41
8-9
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Page 10
Ground Engaging Tools
● Elevating Scraper
● Auger
ELEVATING SCRAPER
Standard auger shoe
● For use in low-to-medium abrasion and low-tohigh impact conditions where accelerated wear is
not a problem.
● Flight assemblies.
● Chain assemblies.*
● Sprockets.*
● Idlers and idler groups.
● Rollers and roller groups.
*Optional heavy-duty chain and sprocket for 623G available through your Cat
dealer.
Tungsten carbide auger shoe
● For use in medium-to-high abrasion and mediumto-high impact conditions where accelerated wear
is a problem.
In today’s competitive environment, machines
must operate efficiently. Inspections identify problems that cause machines to burn more fuel and
shorten component life.
AUGER
Plastic liners
● For use in low-to-high abrasion, plastic liners prevent sticky material from building up on the auger.
Steel wear plates
● For use in medium-to-high abrasion and medium-tohigh impact conditions to protect the auger surface.
8-10
Edition 41
Auger cutting edge
● For use in low-to-high abrasion and low-to-high
impact conditions.
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Page 11
Ground Engaging Tools
● Material Application Guide
● Push-Load TTT Match
Material
Application Guide
Elevator
Self-Load
Single and
Tandem
Engine
Push-Load
Single and
Tandem
Engine
Push Pull
Auger
Tandem
Engine
Wheel Tractor-Scrapers
Coal Bowl
Remarks
Decomposed Granite/Soil
Excellent loading
Decomposed Granite
(Ripped)
Excellent loading by pushloading or push-pull to
reduce cutting of tires
Moist Top Soil
Good to Excellent Loading
Top Soil
Excellent for WTS
Clay/Sand Mixture
Excellent for WTS
Sand
Good to Excellent loading,
but some cases may need
to be push loaded by a TTT
or Push-Pull
Antigo
Excellent WTS material:
lower portion may require
ripping depending on
material density
Coal
Excellent for WTS: ripping
may be required in dense
material
Limestone
In natural state, not suitable
for WTS
Granite
Not suitable for WTS
Sandstone
For WTS to be productive
in sandstone, material needs
to be ripped. In some cases
where density is high, WTS
would not be a good fit
Shot Rock
Below 610 mm (24") good
for WTS when push-loaded
by a TTT to reduce cutting
of tires
Loess Overtill (Banked)
Excellent for WTS: ripping
may be required in dense
material
Loess Overtill (Ripped)
Excellent WTS material
provided rock size does not
exceed 610 mm (24")
Aridisols
Excellent WTS material,
ripping will decrease load
times
Glacial Outwash/
River Rock
Excellent WTS material
provided rock size does not
exceed 610 mm (24")
FOR MORE INFORMATION ON WHEEL TRACTOR-SCRAPER MATERIAL APPLICATIONS REFERENCE PUBLICATION AEXQ0442.
Push-Load TTT Match
D8
D9
D10
D11
621
627
631
637
657
Edition 41
8-11
8
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Wheel Tractor-Scrapers
MODEL
TIRE SIZE
621G
623G
33.25R29
33.25-29
1:58 PM
Page 12
Tire Specifications
TYPE
MODEL
TIRE SIZE
631G
637G
##
32
E-3
E-3
##
E-3
37.25R35
657G
40.5/75R39
627G
33.25R29
8-12
PLY RATING/
STAR RATING*
10/25/10
Edition 41
PLY RATING/
STAR RATING*
TYPE
##
E-3
##
E-3
*Manufacturer uses star (#) rating system instead of ply rating.
Recommended tire.
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Cushion Hitch
Wheel Tractor-Scraper Anatomy
Wheel Tractor-Scrapers
CUSHION HITCH
● Cushion Hitch dampens shocks to provide a smoother ride
● Nitrogen over oil accumulators absorb and dampen road shock
1. Load Cylinder
2. Hitch Castings
3. Scraper Gooseneck
4. Nitrogen Accumulators
5. Orifice
6. Oil from Tractor Hydraulic System
7. Leveling Valve
8. Free-Floating Pistons
8
WHEEL TRACTOR-SCRAPER ANATOMY
Steering Cylinders
Cushion Hitch
Banana Link
Bowl Lift Cylinders
Gooseneck
Fuel Tank
Overflow Guard
Push/Pull Bail
Ejector
Push/Pull Hook
Cushion Push Plate
Apron
Router Bit
Cutting Edge
Bowl
Draft Arms
Push Block
Edition 41
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Rimpull-Speed-Gradeability Curves
● Example
USE OF RIMPULL-SPEEDGRADEABILITY CURVES
The following explanation applies to Rimpull-SpeedGradeability curves for Wheel Tractor-Scrapers,
Construction & Mining Trucks/Tractors and Articulated Trucks.
Maximum speed attainable, gear range and available rimpull can be determined from curves on the
following pages when machine weight and total
effective grade (or total resistance) are known.
Rimpull is the force (in kg, lb or kN) available
between the tire and the ground to propel the
machine (limited by traction).
Weight is defined as Gross Machine Weight (kg or lb)
= Machine + Payload.
Total Effective Grade (or Total Resistance) is grade
resistance plus rolling resistance expressed as
percent grade.
Grade is measured or estimated.
Rolling resistance is estimated (see Tables section
for typical values.)
10 kg/metric ton (20 lb/U.S. ton) = 1% adverse grade.
Example
With a 6% grade and a rolling resistance of 40 kg/
metric ton (80 lb/U.S. ton), find total resistance.
Rolling resistance = 40 kg/t ÷ 10 = 4% Effective
Grade
(English: 80 lb ÷ 20 = 4%)
Total resistance = 4% rolling + 6% grade = 10%
Altitude Derating
Rimpull force and speed must be derated for altitude similar to flywheel horsepower. The percentage loss in rimpull force approximately corresponds
to the percentage loss in flywheel horsepower. See
Tables Section for altitude derations.
8-14
Edition 41
Page 14
Rimpull-Speed-Gradeability
To determine gradeability performance: Read
from gross weight down to the % of total resistance.
(Total resistance equals actual % grade plus 1% for
each 10 kg/metric ton (20 lb./U.S. ton) of rolling
resistance.) From this weight-resistance point, read
horizontally to the curve with the highest obtainable speed range, then down to the maximum speed.
Usable rimpull depends upon traction and weight
on drive wheels.
Example problem:
A 631G with an estimated payload of 37 013 kg
(81,600 lb) is operating on a total effective grade of
10%. Find the available rimpull and maximum attainable speed.
Empty weight payload = Gross Weight
47 628 kg + 37 013 kg = 84 641 kg
(105,002 lb + 81,600 lb = 186,602 lb)
Solution: Using graph on the next page, read from
84 641 kg (186,602 lb) (point A) on top of gross
weight scale down the line to the intersection of the
10% total resistance line (point B).
Go across horizontally from B to the Rimpull
Scale on the left (point D). This gives the required
rimpull: 7756 kg (17,100 lb).
Where the line cuts the speed curve (point C),
read down vertically (point E) to obtain the maximum speed attainable for the 10% effective grade:
12.9 km/h (8 mph).
ANSWER: The machine will climb the 10% effective grade at a maximum speed of 12.9 km/h (8 mph)
in 4th gear. Available rimpull is 7756 kg (17,100 lb).
●●●
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Rimpull-Speed-Gradeability Curves
● Example
Wheel Tractor-Scrapers
GROSS WEIGHT
lb x 1000
kg x
1000
TOTAL RESISTANCE
(Grade plus Rolling)
kg x 1000
RIMPULL
lb x
1000
8
km/h
mph
SPEED
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
A — Loaded 84 641 kg (186,602 lb)
B — Intersection with 10% total resistance line
C — Intersection with rimpull curve (4th gear)
D — Required rimpull 7756 kg (17,100 lb)
E — Speed 12.9 km/h (8 mph)
Edition 41
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Page 16
Travel Time Charts
● Example
USE OF TRAVEL TIME CHARTS
Travel times were derived using Cat Machine Simulation Program and standard tire inputs. Travel times
for machines equipped with (larger) optional tires
vary slightly.
Example problem:
631G hauls its rated payload 37 013 kg — 26 bank
cubic meters (81,600 lb — 34 bank cubic yards) on
a 4% road for 610 m (2000 feet) and returns on a 0%
road for 760 m (2500 feet). Find the cycle time.
Haul —
Using the graph for the Loaded machine, read
from the Travel Distance (one way) scale at 610 m
(2000 feet) across to the 4% total resistance line
(point A). From (point A) read down to the Travel Time
(one way) scale to determine haul time = 1.4 minutes.
Travel Distance One Way
610 m
(2000 ft)
Total Resistance
Travel Time One Way
Return —
Using the graph for the Empty machine, read
from the Travel Distance (one way) scale at 760 m
(2500 feet) across to the 0% total resistance line
(point A). From (point A) read down to the Travel Time
(one way) scale to determine return time = 1 min.
Empty
Total Resistance
Travel Distance One Way
760 m
(2500 ft)
The following explanation applies to travel time
charts for Wheel Tractor-Scrapers, Construction &
Mining Trucks and Articulated Trucks.
One-way travel time can be determined from
graphs on the following pages when one-way travel
distance and total resistance (expressed in percent)
are known. 10 kg/metric ton (20 lb/U.S. ton) equals
1% equivalent grade.
If total resistance is negative (grade assistance
greater than rolling resistance) machine may accelerate downhill requiring the use of retarder or
brakes. Travel time charts cannot be used in these
cases. Consult respective machine retarder curve to
establish maximum safe downhill speed.
Two graphs are given for each hauling unit: one
for the machine carrying its rated payload and one
for the empty machine.
Loaded
Travel Time One Way
8-16
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Travel Time Charts
Typical Fixed Times
Retarder Curves
Wheel Tractor-Scrapers
Cycle Time —
= load* + haul + maneuver & spread* + return
= 0.6 + 1.4 + 0.7
+ 1.0
= 3.7 min.
*For fixed time (load, maneuver and spread)
see the table below.
When cycle time and payload are known, productivity can be calculated. For a more complex
example see the Earthmoving Section.
NOTE: Empty Weights shown on the Wheel TractorScraper charts includes ROPS Canopy. The
travel times will remain within acceptable
limits when applied to a non-ROPS equipped
machine. When calculating TMPH loadings
any additional weight must be considered
in establishing mean tire loads.
●●●
The following explanation applies to retarder curves
for Wheel Tractor-Scrapers and Articulated Trucks.
The speed that can be maintained (without use
of service brake) when the machine is descending a
grade with retarder fully on can be determined from
the retarder curves in this section if gross machine
weight and total effective grade are known.
Total Effective Grade (or Total Resistance) is grade
assistance minus rolling resistance.
10 kg/metric ton (20 lb/U.S. ton) = 1% adverse
grade.
TYPICAL FIXED TIMES FOR SCRAPERS
(Times may vary depending on job conditions)
Model
Loaded By
613G
623G
621G
627G
621G
627G
627G/PP
631G
637G
631G
637G
637G/PP
657G
657G
Self
Self
One D8R
One D8R
One D9R
One D9R
Self
One D9R
One D9R
One D10R
One D10R
Self
One D11R
Push Pull
Self
Auger
Auger
Coal
Auger
Coal
627G
637G
637G
657G
657G
*Load time per pair, including transfer time.
Load Time
(Min.)
Maneuver and
Spread or
Maneuver and
Dump (Min.)
0.9
0.9
0.5
0.5
0.4
0.4
0.9*
0.6
0.6
0.5
0.5
1.0*
0.6
1.1*
0.7
0.7
0.7
0.6
0.7
0.6
0.6
0.7
0.6
0.7
0.6
0.6
0.6
0.6
0.7
0.8
0.8
1.0
0.8
0.7
0.7
0.7
0.6
0.6
USE OF RETARDER CURVES
Example
15% favorable grade with 5% rolling resistance.
Find Total Effective Grade.
Total Effective Grade = 15% Grade Assistance —
5%
Rolling Resistance = 10% Total Effective Grade
Assistance.
Example problem:
A 651E with an estimated payload of 47 175 kg
(104,000 lb) descends a 10% total effective grade.
Find constant speed and gear range with maximum
retarder effort. Find travel time if the slope is 610 m
(2000 ft) long.
Empty Weight + Payload = Gross Weight
= 60 950 kg + 47 175 kg = 108 125 kg
(134,370 lb + 104,000 lb = 238,370 lb)
Edition 41
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Retarder Curves
● Example
Solution: Using the retarder curve below, read from
108 125 kg (238,370 lb) (point A) on top of gross
weight scale down the line to the intersection of the
10% effective grade line (point B).
Go across horizontally from point B to the intersection of the retarder curve (point C). Point C intersects at the 5 (5th gear) range.
Where point C intersects the retarder curve, read
down vertically to point D on the bottom scale to
obtain the constant speed: 21.7 km/h (13.5 mph).
GROSS WEIGHT
ANSWER: The 651E will descend the slope at
21.7 km/h (13.5 mph) in 5th gear. Travel time is
1.68 minutes.
610 m
__________
= 1.68 min
363 m/min
*(mph 88 = F.P.M.)
2000
ft
_______________ = 1.68 min
13.5 mph 88*
NOTE: The basic Distance-Speed-Time formula is
60 D ÷ S = T (or “60 D Street”), where 60 is
minutes, D is distance, S is speed and T is
time. In the above problem, 60 610 m ÷
21.7 km/h 1000 = T.
60 610
____________
= T = (1.68)
21.7 1000
lb x 1000
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
kg x 1000
km/h
mph
SPEED
8-18
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
A — Loaded 108 125 kg (238,370 lb)
B — Intersection with 10% effective grade line
C — Intersection with retarder curve (5th gear)
D — Constant speed 21.7 km/h (13.5 mph)
Edition 41
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Page 19
621G Rimpull-Speed-Gradeability
● 33.25R29 Tires
Wheel Tractor-Scrapers
TIER 3
STANDARD ARRANGEMENT*
GROSS WEIGHT
lb x kg x
1000 1000
0
20
40
10
0
60
20
80
30
100
40
120
140
50
lb x 1000
60
70
40
E
kg x 1000
L
30
1
RIMPULL
60
20
30%
40
25%
2
20
20%
3
10
8
15%
4
10%
5
0
TOTAL RESISTANCE
(Grade plus Rolling)
80
6
7
5%
8
0
0
0
10
5
20
10
30
15
40
20
25
60 km/h
50
30
35
mph
SPEED
*at sea level
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 33 995 kg (74,946 lb)
L — Loaded 57 945 kg (127,746 lb)
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621G Retarding
● 33.25R29 Tires
TIER 3*
GROSS WEIGHT
20
0
40
10
60
80
20
30
100
120
40
140
50
E
160
60
L
180 lb x 1000
80 kg x 1000
70
30%
25%
20%
3
15%
4
5
10%
6
7
5%
8
0
0
5
10
5
15
20
10
25
15
30
35
40
20
25
45
50
30
55
60
35
65
70 km/h
40
mph
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
0
SPEED
*at sea level
8-20
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 33 995 kg (74,946 lb)
L — Loaded 57 945 kg (127,746 lb)
Edition 41
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621G Travel Time — Loaded
● 33.25R29 Tires
Wheel Tractor-Scrapers
LOADED
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 33 995 kg (74,946 lb)
Payload: 23 950 kg (52,800 lb)
Edition 41
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621G Travel Time — Empty
● 33.25R29 Tires
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 33 995 kg (74,946 lb)
8-22
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623G Rimpull-Speed-Gradeability
● 33.25R29 Tires
Wheel Tractor-Scrapers
GROSS WEIGHT
10
lb x
1000
200
kg x
1000
20
4
40
8
6
10
60
80
20
100
200
40
100
60
80 100 kg x 1000
L
E
80
lb x 1000
60
80
40
1
60
RIMPULL
40
30%
25%
20%
20
2
20
15%
3
10
8
10%
8%
4
6
10
8
5
6%
6
4
2
4%
7
6
4
TOTAL RESISTANCE
(Grade plus Rolling)
100
2
8
2%
8
1
0.8
0.6
1
0
0
5
10
5
15
10
20
25
15
30
35
20
40
25
45
50
30
55
35
60
65
70 km/h
40
mph
SPEED
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 37 510 kg (82,695 lb)
L — Loaded 62 548 kg (137,895 lb)
Edition 41
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623G Retarding
● 33.25R29 Tires
GROSS WEIGHT
lb x 1000
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
kg x 1000
km/h
mph
SPEED
8-24
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 37 510 kg (82,695 lb)
L — Loaded 62 548 kg (137,895 lb)
Edition 41
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623G Travel Time — Loaded
● 33.25R29 Tires
Wheel Tractor-Scrapers
LOADED
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 37 510 kg (82,695 lb)
Payload: 25 038 kg (55,200 lb)
Edition 41
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623G Travel Time — Empty
● 33.25R29 Tires
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 37 510 kg (82,695 lb)
8-26
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627G Rimpull-Speed-Gradeability
● 33.25R29 Tires
Wheel Tractor-Scrapers
TIER 3
STANDARD ARRANGEMENT*
GROSS WEIGHT
lb x kg x
1000 1000
0
20
40
10
0
60
20
80
30
100
40
120
140
50
lb x 1000
60
70 kg x 1000
60
E
L
120
50
1
40
RIMPULL
80
30
60
2
40
20
30%
25%
3
10
15%
5
6
10%
7
0
8
20%
4
20
TOTAL RESISTANCE
(Grade plus Rolling)
100
8
5%
0
0
0
10
5
20
10
30
15
40
20
25
60 km/h
50
30
35
mph
SPEED
*at sea level
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 39 443 kg (86,957 lb)
L — Loaded 63 393 kg (139,757 lb)
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627G Retarding
● 33.25R29 Tires
TIER 3*
GROSS WEIGHT
20
0
40
10
60
80
20
30
100
120
40
140
50
160
60
E
70
180
lb x 1000
80
kg x 1000
L
30%
3
25%
4
20%
15%
5
6
10%
7
8
5%
0
0
5
10
5
15
20
10
25
15
30
35
20
40
25
45
50
30
55
60
35
65
40
70
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
0
km/h
mph
SPEED
*at sea level
8-28
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 39 443 kg (86,957 lb)
L — Loaded 63 393 kg (139,757 lb)
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Page 29
627G Travel Time — Loaded
● 33.25R29 Tires
● Standard and Push-Pull
Wheel Tractor-Scrapers
LOADED
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 39 443 kg (86,957 lb)
Payload: 23 950 kg (52,800 lb)
Edition 41
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627G Travel Time — Empty
● 33.25R29 Tires
● Standard and Push-Pull
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 39 443 kg (86,957 lb)
8-30
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631G Rimpull-Speed-Gradeability
● 37.25R35 Tires
Wheel Tractor-Scrapers
GROSS WEIGHT
15
kg x
1000
lb x
1000
65
55
45
150
120
100
50
40
15
30
10
8
40 50 60
2
1
90
80 100 120 160 200
kg x 1000
lb x 1000
L
1
30%
25%
20%
2
15%
12%
10%
8%
3
20
4
15
5
6
4
40 50 60 70
E
70
25
20
30
6%
5%
4%
6
10
7
8
5
TOTAL RESISTANCE
(Grade plus Rolling)
RIMPULL
35
30
20
8
3%
2%
2
0
0
5
10
15
20
25
30
35
mph
5 10 15 20 25 30 35 40 45 50 55
km/h
SPEED
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 47 628 kg (105,002 lb)
L — Loaded 84 641 kg (186,602 lb)
Edition 41
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631G Retarding
● 37.25R35 Tires
GROSS WEIGHT
30
55
40
50
75
60
100
70
125
150
80
kg x 1000
175
lb x 1000
30%
E
3
L
16%
4
5
10%
6
7
5%
8
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
22%
1%
0
0
5
5
10
10
15
15
20
25
20
30
35
25
40
30
45
50
35
55
mph
60
km/h
SPEED
8-32
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 47 628 kg (105,002 lb)
L — Loaded 84 641 kg (186,602 lb)
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Page 33
631G Travel Time — Loaded
● 37.25R35 Tires
Wheel Tractor-Scrapers
LOADED
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 47 628 kg (105,002 lb)
Payload: 37 013 kg (81,600 lb)
Edition 41
8-33
8
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Page 34
631G Travel Time — Empty
● 37.25R35 Tires
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 47 628 kg (105,002 lb)
8-34
Edition 41
EPHB-Sec08(p31-42):EPHB-Sec08(p31-42)
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Page 35
637G Rimpull-Speed-Gradeability
● 37.25R35 Tires
Wheel Tractor-Scrapers
GROSS WEIGHT
lb x
1000
65
55
45
150
120
100
RIMPULL
35
50
40
15
30
10
8
30
40 50 60
90
kg x 1000
80 100 120 160 200
E
lb x 1000
L
2
30%
25%
20%
3
15%
12%
10%
8%
4
5
20
6
15
6
4
40 50 60 70
1
70
25
20
30
20
7
10
6%
5%
4%
8
TOTAL RESISTANCE
(Grade plus Rolling)
15
kg x
1000
8
3%
2
1
5
2%
2
0
0
5
10
15
20
25
30
35
mph
5 10 15 20 25 30 35 40 45 50 55
km/h
SPEED
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 54 057 kg (119,175 lb)
L — Loaded 91 070 kg (200,775 lb)
Edition 41
8-35
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Page 36
637G Retarding
● 37.25R35 Tires
GROSS WEIGHT
35
50
55
100
75
95
150
115
200
250
135
kg x 1000
300
lb x 1000
E
25%
L
20%
3
15%
4
10%
5
6
7
5%
8
1%
0
0
5
5
10
10
15
15
20
20
25
30
35
25
40
30
45
50
35
55
mph
60
km/h
SPEED
8-36
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 54 057 kg (119,175 lb)
L — Loaded 91 070 kg (200,775 lb)
Edition 41
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
30%
EPHB-Sec08(p31-42):EPHB-Sec08(p31-42)
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Page 37
637G Travel Time — Loaded
● 37.25R35 Tires
● Standard and Push-Pull
Wheel Tractor-Scrapers
LOADED
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet meters
minutes
TIME
Empty weight: 54 057 kg (119,175 lb)
Payload: 37 013 kg (81,600 lb)
Edition 41
8-37
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Page 38
637G Travel Time — Empty
● 37.25R35 Tires
● Standard and Push-Pull
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 54 057 kg (119,175 lb)
8-38
Edition 41
EPHB-Sec08(p31-42):EPHB-Sec08(p31-42)
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Page 39
657G Rimpull-Speed-Gradeability
● 37.25/R35 Tires
Wheel Tractor-Scrapers
GROSS WEIGHT*
lb x
1000
110
240
100
220
90
200
80
180
RIMPULL
70
60
20
0
40
50
60
100
80
150
100
200
120
250
E
140
300
lb x 1000
L
1
160
140
40%
120
50
35%
30%
25%
100
40
80
30
kg x 1000
2
60
20
40
10
20
0
0
3
5
0
10
8
20%
15%
4
5 6
0
TOTAL RESISTANCE
(Grade plus Rolling)
0
kg x
1000
10
15
20
10%
7
8
20
25
30
40
5%
30
50
35
mph
60
km/h
SPEED
*at sea level
KEY
KEY
1 — 1st Gear Torque Converter Drive
2 — 2nd Gear Torque Converter Drive
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 72 804 kg (160,505 lb)
L — Loaded 119 978 kg (264,505 lb)
Edition 41
8-39
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Page 40
657G Retarding
● 37.25/R35 Tires
GROSS WEIGHT*
0
15
30
45
60
75
90
105
120
135
kg x 1000
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
lb x 1000
E
25%
L
3
20%
4
15%
5
10%
6
7
5%
8
1%
0
0
5
5
10
10
15
15
20
25
20
30
25
35
40
30
45
50
mph
km/h
SPEED
*at sea level
8-40
KEY
KEY
3 — 3rd Gear Direct Drive
4 — 4th Gear Direct Drive
5 — 5th Gear Direct Drive
6 — 6th Gear Direct Drive
7 — 7th Gear Direct Drive
8 — 8th Gear Direct Drive
E — Empty 72 804 kg (160,505 lb)
L — Loaded 119 978 kg (264,505 lb)
Edition 41
EFFECTIVE GRADE
(Grade minus Rolling Resistance)
40% 35% 30%
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Page 41
657G Travel Time — Loaded
● 40.5/75R39 Tires
● Standard and Push-Pull
Wheel Tractor-Scrapers
LOADED
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet meters
minutes
TIME
Empty weight: 72 804 kg (160,505 lb)
Payload: 47 174 kg (104,000 lb)
Edition 41
8-41
8
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Page 42
657G Travel Time — Empty
● 40.5/75R39 Tires
● Standard and Push-Pull
EMPTY
meters
TOTAL RESISTANCE
(Grade plus Rolling)
DISTANCE ONE WAY
feet
minutes
TIME
Empty weight: 72 804 kg (160,505 lb)
8-42
Edition 41
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Page 43
TOWED SCRAPERS
CONTENTS
TOWED SCRAPERS
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
Recommended Pull Units . . . . . . . . . . . . . . . . .8-43
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .8-44
Features:
● High-strength, abrasion-resistant steel is used
inside the bowl on the floor, walls, apron and ejector face for maximum strength and wear life. The
bowl uses a cellular design for superior strength
and dent resistance.
● Standard heavy-duty, dry-disc brake calipers ensure
effective stopping from safe operating speeds.
● The bolted hitch design eliminates pin wear. The
tongue’s robust, straight-line design efficiently
transfers maximum power to the cutting edge for
outstanding performance.
● Standard radial tires provide maximum flotation
and durability.
● Cat Towed Scrapers easily adapt to jobsite conditions. They can be pulled in single or tandem configurations, top loaded with an excavator, or —
on an intermittent basis — be push loaded with
a track-type tractor.
● Ideally suited to be pulled by Cat Track-Type Tractors and Challenger® Special Application Tractors.
Applications:
On any given jobsite, there are several ways to
accomplish the task of hauling/moving material:
● Hydraulic excavators with articulated trucks.
● Wheel tractor-scrapers (self-loading, push loading, or push-pull loading).
● Wheel loaders with rigid-frame trucks.
● Agricultural tractors (tired or rubber tracked) with
towed scrapers.
● Track-type tractors dozing material.
8
● Track-type tractors with towed scrapers.
Towed scrapers excel for contractors removing top
soil with the following ideal conditions:
● Haul distance under 0.8 km (2500 ft).
● Materials with a bank density of less than 1780 kg/m³
(3000 lb/yd³).
● No large rocks or stumps.
Towed scrapers also complement wheel tractor
scrapers by expanding the work season with high
flotation in the softest underfoot conditions. Adding
towed scrapers to the Caterpillar product line gives
contractors more solutions for selecting the earthmoving system that is most cost effective for their
application. Caterpillar offers the full range of earthmoving and hauling machines — dozers, wheel tractor
scrapers, towed scrapers, wheel loaders with rigid
frame trucks and hydraulic excavators with articulated trucks.
Recommended Pull Units:
Cat Towed Scrapers are designed to be pulled by
Cat Track-Type Tractors and Challenger MTS800
and MTS900 Special Application Tractors. The following tables show the minimum recommended
power required for single and tandem towed scraper
applications.
Edition 41
8-43
EPHB-Sec08(p43-46):EPHB-Sec08(p43-46)
Towed Scrapers
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Page 44
Specifications
MODEL
Scraper Bowl:
Capacity — Heaped
Width of Cut, to Router Bits
Rated Load
Capacity Struck
Depth of Cut — Maximum
Ground Clearance — Maximum
Cutting Edge — Thickness
Depth of Spread — Maximum
Apron Opening
Weights:
Empty Weight
Distribution, Empty — Tongue
Distribution, Empty — Axle
Distribution, Loaded — Tongue
Distribution, Loaded — Axle
Brakes and Tires:
Brake Type
Calipers, Lead — Qty
Calipers, Trail — Qty
Tires — Qty
Tire — Standard
Tire — Optional
Dimensions:
Width — Inside of Bowl
Width — Outside Rear Rires
Width — Outside Bowl
Height — Overall Shipping
Height — Floor to Top of Ejector
Height — Sidewall
Height — Ground to Cutting Edge — Maximum
Length — Maximum
Length — Floor
Hydraulics:
Front Bowl Cylinder — Bore
Front Bowl Cylinder — Stroke
Rear Bowl Cylinder — Bore
Rear Bowl Cylinder — Stroke
Apron Cylinder — Bore
Apron Cylinder — Stroke
Ejector Cylinder — Bore
Ejector Cylinder — Stroke
Pull Unit Recommendations:
Steel Track-Type Tractor — Single Scraper
Steel Track-Type Tractor — Tandem Scrapers
Rubber Tracked Ag Tractor — Single Scraper
Rubber Tracked Ag Tractor — Tandem Scrapers
Rubber Tired Ag Tractor — Single Scraper
Rubber Tired Ag Tractor — Tandem Scrapers
Hydraulic Services Required — Single Scraper
Hydraulic Services Required — Tandem Scraper
8-44
Edition 41
TS180
14.8 m3
3200 mm
20 800 kg
9.9 m3
203 mm
533 mm
22 mm
610 mm
1600 mm
11 748 kg
TS185
18.8 yd3
10.5 ft
45,900 lb
13 yd3
8 in
21 in
0.87 in
24 in
63 in
14.5 m3
3785 mm
21 050 kg
11 m3
305 mm
597 mm
22 mm
711.2 mm
1600 mm
25,900 lb
11 748 kg
19.0 yd3
12.4 ft
46,400 lb
14.4 yd3
12 in
23.5 in
0.87 in
28 in
63 in
32,020 lb
28%
72%
29%
71%
28%
72%
29%
71%
Dry-Disc
2 per side
1 per side
2
29.5R25
875 65R29
Dry-Disc
2 per side
1 per side
4
23.5R25
26.5R25
3048 mm
3099 mm
3378 mm
2362 mm
1930 mm
1219 mm
657 mm
8915 mm
1295 mm
120 in
122 in
133 in
93 in
76 in
48 in
25.9 in
351 in
51 in
3632 mm
3835 mm
3988 mm
2515 mm
1930 mm
1219 mm
687 mm
9119 mm
1219 mm
143 in
151 in
157 in
99 in
76 in
48 in
27.0 in
359 in
48 in
127 mm
508 mm
5 in
20 in
127 mm
508 mm
127 mm
203 mm
102 mm
965 mm
127 mm
914 mm
5 in
20 in
5 in
8 in
4 in
38 in
5 in
36 in
N/A
N/A
102 mm
813 mm
127 mm
1372 mm
4 in
32 in
5 in
54 in
D7
D8
224-298 kW
298-373 kW
224-298 kW
298-373 kW
D8
D9
300-400 hp
400-500 hp
300-400 hp
400-500 hp
2
4
298-373 kW
373-447 kW
298-373 kW
373-447 kW
400-500 hp
500-600 hp
400-500 hp
500-600 hp
3
6
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Page 45
Specifications
MODEL
Scraper Bowl:
Capacity — Heaped
Width of Cut, to Router Bits
Rated Load
Capacity Struck
Depth of Cut — Maximum
Ground Clearance — Maximum
Cutting Edge — Thickness
Depth of Spread — Maximum
Apron Opening
Weights:
Empty Weight
Distribution, Empty — Tongue
Distribution, Empty — Axle
Distribution, Loaded — Tongue
Distribution, Loaded — Axle
Brakes and Tires:
Brake Type
Calipers, Lead — Qty
Calipers, Trail — Qty
Tires — Qty
Tire — Standard
Tire — Optional
Dimensions:
Width — Inside of Bowl
Width — Outside Rear Rires
Width — Outside Bowl
Height — Overall Shipping
Height — Floor to Top of Ejector
Height — Sidewall
Height — Ground to Cutting Edge — Maximum
Length — Maximum
Length — Floor
Hydraulics:
Front Bowl Cylinder — Bore
Front Bowl Cylinder — Stroke
Rear Bowl Cylinder — Bore
Rear Bowl Cylinder — Stroke
Apron Cylinder — Bore
Apron Cylinder — Stroke
Ejector Cylinder — Bore
Ejector Cylinder — Stroke
Pull Unit Recommendations:
Steel Track-Type Tractor — Single Scraper
Steel Track-Type Tractor — Tandem Scrapers
Rubber Tracked Ag Tractor — Single Scraper
Rubber Tracked Ag Tractor — Tandem Scrapers
Rubber Tired Ag Tractor — Single Scraper
Rubber Tired Ag Tractor — Tandem Scrapers
Hydraulic Services Required — Single Scraper
Hydraulic Services Required — Tandem Scraper
Towed Scrapers
TS220
18.0 m3
3480 mm
25 580 kg
13 m3
262 mm
508 mm
22 mm
737 mm
1600 mm
13 145 kg
TS225
23.5 yd3
11.4 ft
56,400 lb
17 yd3
10.3 in
20 in
0.87 in
29 in
63 in
18.0 m3
3785 mm
25 580 kg
13 m3
262 mm
660 mm
22 mm
737 mm
1600 mm
28,980 lb
15 250 kg
23.5 yd3
12.4 ft
56,400 lb
17 yd3
10.3 in
26 in
0.87 in
29 in
63 in
33,620 lb
28%
72%
29%
71%
28%
72%
29%
71%
Dry-Disc
2 per side
2 per side
2
875 65R29
N/A
Dry-Disc
2 per side
2 per side
4
26.5R25
N/A
8
3353 mm
3378 mm
3683 mm
2464 mm
2134 mm
1219 mm
698 mm
9677 mm
1448 mm
132 in
133 in
145 in
97 in
84 in
48 in
27.5 in
381 in
57 in
3632 mm
3912 mm
3988 mm
2515 mm
1930 mm
1219 mm
819 mm
10287 mm
1346 mm
143 in
154 in
157 in
99 in
76 in
48 in
31.9 in
405 in
53 in
140 mm
508 mm
5.5 in
20 in
140 mm
508 mm
152 mm
203 mm
102 mm
965 mm
127 mm
1219 mm
5.5 in
20 in
6 in
8 in
4 in
38 in
5 in
48 in
N/A
N/A
102 mm
965 mm
127 mm
1524 mm
4 in
38 in
5 in
60 in
D8
D10
298-373 kW
373-447 kW
298-373 kW
373-447 kW
D8
D10
400-500 hp
500-600 hp
400-500 hp
500-600 hp
2
4
298-373 kW
373-447 kW
298-373 kW
298-373 kW
400-500 hp
500-600 hp
400-500 hp
500-600 hp
3
6
Edition 41
8-45
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Page 46
Specifications
Pull Unit
Hauling Distance
Materials
Cat Track-Type Tractors
250-300 m (800-1000 ft)
Soil, dirt and small rock, sand and shale (no shot rock)
Challenger MT800 Series Tractors
Up to 915 m (3000 ft)
Challenger MT900 Series Tractors
Up to 1215 m (4000 ft)
Soil, sand and gravel mix
TS180 Recommended Pull Units
8-46
Configuration
Track-Type Tractor
Ag Tractor
Single
D7
224-298 kW (300-400 hp)
Tandem
D8
298-373 kW (400-500 hp)
Edition 41