INTERACTIVE SCHEMATIC
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ELECTRICAL SYMBOLS
HOTKEYS (Keyboard Shortcuts)
BASIC HYDRAULIC
COMPONENT SYMBOLS
T
FUNCTION
Zoom In
Zoom Out
Fit to Page
Hand Tool
Find
KEYS
“CTRL” / “+”
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“CTRL” / “0” (zero)
“SPACEBAR” (hold down)
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Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch
Circuit Breaker
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Schematic Symbols
and Definitions page
Pump
or Motor
Variability
Fluid
Conditioner
Spring
(Adjustable)
SCHEMATIC SYMBOLS AND DEFINITIONS
INTERNAL PASSAGEWAYS
VALVES
ENVELOPES
Two Position
One Position
Three Position
PORTS
Two-way
Three-Way
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
Infinite
Positioning
Two
Position
PARALLEL
FLOW
PUMPS
Unidirectional
Three
Position
Unidirectional
CONTROL
AB
AB
P T
P T
Single Acting
Spring
Loaded
Fluid
Conditioner
Spring
(Adjustable)
Spring
Pressure
Compensation
Control
Valves
Line Restriction
(Variable)
Restriction
Line Restriction
(Fixed)
Line Restriction
Variable and Pressure
Compensated
2-Section
Pump
Attachment
Pump: Variable and
Pressure Compensated
Bidirectional
MOTORS
Double Acting
Infinite Position
CHECK
Basic
Symbol
Variability
FIXED DISPLACEMENT
Shifted Position
Normal Position
Pump
or Motor
Bidirectional
VARIABLE DISPLACEMENT
NON- COMPENSATED
CYLINDERS
Four-Way
BASIC HYDRAULIC
COMPONENT SYMBOLS
FIXED DISPLACEMENT
CROSS
FLOW
ACCUMULATORS
Shuttle
Unidirectional
VARIABLE DISPLACEMENT
NON- COMPENSATED
Pilot
Controlled
Spring Loaded Gas Charged
Unidirectional
PILOT CONTROL
Bidirectional
ROTATING SHAFTS
RELEASED PRESSURE
External Return
Bidirectional
Unidirectional
Internal Return
Bidirectional
REMOTE SUPPLY PRESSURE
Simplified
Complete
Internal
Supply Pressure
Hydraulic Pneumatic
Energy Triangles
COMBINATION CONTROLS
Solenoid
Solenoid
or Manual
Solenoid
and Pilot
Solenoid and
Pilot or Manual
MEASUREMENT
LINES
Servo
Thermal
Detent
Crossing
Joining
Manual Shutoff
General Manual
Push Button
Pedal
Spring
Vented
Pressurized
Transducer
(Fluid)
Transducer
(Gas / Air)
M
Generator
Electric
Motor
Flow
Return Above Fluid Level
Return Below Fluid Level
ELECTRICAL SYMBOLS
HYDRAULIC SYMBOLS - ELECTRICAL
G
Temperature
Pressure
FLUID STORAGE RESERVOIRS
MANUAL CONTROL
Push-pull Lever
MAIN AUX.
T
Pressure
Switch
Pressure Switch
(Adjustable)
Temperature
Switch
Electrical
Wire
Pressure
Switch
Temperature
Switch
BASIC ELECTRICAL COMPONENT SYMBOLS
Level
Switch
Flow
Switch
Circuit Breaker
HARNESS AND WIRE SYMBOLS
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates
that the component has screw terminals and a wire can be disconnected from it.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
AG-C4
111-7898
Part Number: for
Connector Plug
1
L-C12
3E-5179
2
Ground (Wired): This indicates that the component is connected to a grounded wire.
The grounded wire is fastened to the machine.
Receptacle
Pin or Socket Number
Plug
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
harness (C1, C2, C3, ...)
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of
a normally open reed switch; it opens the contacts of a normally closed reed switch.
T
Sender: A component that is used with a temperature or pressure gauge.
The sender measures the temperature or pressure.
Its resistance changes to give an indication to the gauge of the temperature or pressure.
Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close the switch part of the relay.
Solenoid: A solenoid is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close a valve or move a piece of metal that can do work.
Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a
permanent magnet. It has two coils (latch and unlatch) that make electromagnet
when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
L-C12
3E-5179
5A
Fuse (5 Amps)
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
9X-1123
Component
Part Number
325-AG135 PK-14
Wire Gauge
Wire Color
1
2
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
1
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
UENR1259-06
October 2017
M316D, M318D, M322D, M320D2
And M322D2 Wheeled Excavator
M318D MH, M322D MH, M322D2 MH
And M324D2 MH Material Handler
Hydraulic System
M316D:
P6K1-UP
D6W1-UP
M318D:
P8L1-UP
D8W1-UP
M322D:
P2T1-UP
D2W1-UP
M322D2:
EN21-UP
M318D MH:
P9M1-UP
D9X1-UP
M322D MH:
D3X1-UP
P3W1-UP
M320D2:
EN81-UP
M322D2 MH:
EN91-UP
M324D2 MH:
EN31-UP
© 2017 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION
Component Location
Component Location -
Part
Machine Schematic
Number Location Location
Description
1
C-9
2
C-10
8U-2624
3
J-8
Accumulator Gp - Pilot
8U-6159
4
Cap - Breather (Hydraulic Tank)
194-7849
5
Control Gp -Hyd Hand (Stabilizer / Blade)
Accumulator Gp - Brake
235-5646
Accumulator Gp - Osc Axle
C-14
255-8547
50
Accumulator Gp - Ride Control
340-3267
51
B-12
Control Gp - Pilot Operated (VA Boom)
112-5704
52
E-12
A-5
Cylinder Gp - Hydraulic Cab Riser
Note A
53
H-13
Cylinder Gp - MH Boom
Note A
54
249-4939
55
257-6104
6
E-13
Note A
7
H-6
Cylinder Gp - Bucket
Note A
8
G-4
Cylinder Gp - Dozer Blade
Note A
9
J-12
Cylinder Gp - Osc Axle Lock
Note A
10
J-8
Cylinder Gp - Stabilizer
Note A
11
Cylinder Gp - Steering
Note A
Cylinder Gp - Stick
Filter Gp - Main Pump Oil Return
Part
Machine Schematic
Number Location Location
Description
Accumulator Gp - Boom Damping MH
Cylinder Gp - Boom
Filter Gp - Fan Circuit High Pressure
Auxillary Attachments
Cylinder Gp - MH Dozer Blade
F-14
H-10
B-14
E-14
J-6
I-14
Cylinder Gp - MH Stick
Note A
56
J-7
Cylinder Gp - Offset Boom Tilt
Note A
57
I-12
12
I-8
Cylinder Gp - Quick Coupler
Note A
58
H-8
Note A
13
G-5
Cylinder Gp - VA Boom
Note A
59
H-8
227-6000
14
C-6
Motor Gp - Control (12.5KW Generator)
227-5999
60
F-16
15
A-4
Motor Gp - Control (15KW Generator)
152-7371
61
D-16
Motor Gp - Reversable Fan
297-1571
62
D-5
M316D , M318D
193-5973
M322D, M318D MH , M322D MH
290-5479
J-14
Filter Gp - Pilot High Pressure
145-7750
16
C-8
Solenoid As - Hyd Modulation (Implement Pump)
216-1397
63
C-8
Filter Gp - Swing Pump & Implement Pump Drain
8U-0198
17
A-7
Valve As - Cab Lowering (Inside Cab)
226-9860
64
B-10
Filter Gp - Swing Pump Make Up Circuit
109-7288
18
C-6
Valve As - Cab Lowering (Outside Cab)
226-9860
65
B-10
Filter Gp - Travel Motor Drain
8U-0198
19
A-4
Valve Gp - 2nd High Pressure Control
252-1269
66
E-9
Motor Gp - Fan
281-6268
20
D-6
Valve Gp - Anti Drift (Multi Combination Valve)
67
G-2
21
C-5
22
J-9
68
G-5
23
E-12
Valve Gp - Boom Lowering Control Valve
254-2675
69
24
B-6
Valve Gp - Check (Offset Boom) M316D
238-7021
70
I-12
Valve Gp - Control (12.5KW Generator)
192-3177
71
F-16
Valve Gp - Control (15KW Generator)
334-7445
72
D-16
Valve Gp - Control (Hydraulic Hammer)
252-5984
73
J-1
Valve Gp - Control (Quick Coupler)
340-3327
74
G-8
Valve Gp - Control (VA Boom)
251-8038
75
Motor Gp - Swing
M316D 152-7374
M318D, M322D, M318D MH , M322D MH 152-7371
Motor Gp - Travel
291-3711
Pedal Gp - Travel Valve
with Magnet
254-2685
with out Magnet
254-2684
M316D
251-8032
M318D , M318D MH
251-8034
M322D , M322D MH
251-8036
non MH
329-5735
MH
329-5736
Pump Gp - Fan
281-6269
Pump Gp - Implement
Pump Gp - Pilot / Steering / Brake / Aux
Pump Gp - Swing
25
B-7
26
C-3
27
B-8
M316D 190-8213
M318D , M318D MH 190-8199
28
B-6
M322D , M322D MH 196-8429
292-2769
Swivel Gp
Tank As - Hydraulic
M318D, M322D, M318D MH, M322D MH 254-0488
Valve Gp - Anti Drift (Stick)
M316D 254-0489
M318D, M322D, M318D MH, M322D MH 254-0488
76
Valve Gp - Manual Shutoff
277-0954
77
H-3
78
F-12
Valve Gp - Medium Pressure Control
G-13
MPF Only
254-2643
MPF & Offset
254-2644
MPF & Joystick Steering
254-2646
M318D
321-8799
MPF, Offset & Joystick Steering
254-2647
MPF & HCR
304-9344
MPF, HCR & Joystick Steering
304-9345
M322D
338-8189
338-8319
M322D MH
338-8329
30
E-8
B-15
145-7166
338-8199
M318D MH
G-6
E-14
Valve Gp - Manual Boom Lowering
M316D
Valve Gp - Diverter Bucket Cyl (Head End)
A-13
Valve Gp - Multi Combination
E-15
252-5983
79
G-3
290-9591
31
G-4
Valve Gp - Pilot (Joystick Steering)
242-9670
80
H-11
290-9589
32
G-3
D-5
Valve Gp - Reversable Fan
308-1191
81
M316D
340-3336
Valve Gp - Selector (Pattern Changer) not MH's
243-5227
82
J-2
M318D
265-7154
Valve Gp - Solenoid (Dozer Blade)
196-7544
83
J-11
Valve Gp - Diverter Bucket Cyl (Rod End)
Valve Gp - Main Control
29
H-5
M316D 254-0489
33
F-4
M318D MH
251-8026
Valve Gp - Solenoid (Heavy Lift)
196-7486
84
C-12
M322D
251-8025
Valve Gp - Solenoid (LH) not MH's
295-7688
85
H-10
M322D MH
251-8027
Valve Gp - Solenoid (MH Dozer Shutoff)
291-6475
86
I-6
Valve Gp - Pilot Manifold
254-2662
34
B-11
Valve Gp - Solenoid (RH) not MH's
295-7689
87
H-9
Valve Gp - Pilot Operated (Boom / Bucket)
243-4046
35
E-11
Valve Gp - Solenoid (Ride Control)
299-3659
88
H-10
Valve Gp - Pilot Operated (Stick / Swing)
243-4046
36
E-12
Valve Gp - Solenoid (Smart Boom)
265-7156
89
F-10
Valve Gp - Solenoid (Stabilizer)
196-7543
90
Valve Gp - Steering
M316D, M318D
205-6215
M322D, M318D MH, M322D MH
187-3774
37
E-10
Valve Gp - Steering Priority
188-1814
38
C-8
Valve Gp - Travel Brake
322-0100
39
C-9
Valve Gp - Travel Bypass (Fast Travel)
265-7287
40
G-4
Valve Gp - Stick Lowering Control
254-2676
91
Valve Gp - VA Boom Lowering Control Valve
254-2677
92
I-7
I-14
I-15
G-8
TAP TABLE
Tap Location
Pressure and Sampling
Tap
Number
Description
Schematic
Location
AA
Swing Pump Pressure
C-6
BB
Swing Motor Pressure
B-6
CC
Implement Pump Pressure
B-7
DD
Accumulator Service Brake (1st Brake)
C-10
EE
Brake Pressure
C-10
FF
Accumulator Service Brake (2nd Brake)
C-9
GG
Travel Pedal Pilot Pressure
B-12
HH
Travel Motor Control
B-13
KK
Travel Motor Pressure
I-10
LL
Clutch Release
J-10
MM
Transmission Brake Pressure
I-10
NN
Transmission Clutch Pressure
I-10
P1
Implement Pump Outlet Pressure
D-4
P2
Load Sense
D-4
P3
Pilot Pressure
D-4
P4
Pilot / Steering / Brake / MPF / Pump Outlet Pressure
D-4
P5
Implement Pump Power Shift Pressure
D-4
P6
Swing Pump Power Shift Pressure
D-4
P7
Fan Pump Outlet Pressure
D-4
P8
Joystick Steering Pressure
D-4
16
15
14
13
12
11
10
8
9
7
6
5
4
3
2
(82) VALVE GP
SELECTOR / FLOW CONTROL
243-5227
(55) CYLINDER GP
MH DOZER BLADE
249-4939
SCHEMATIC FOR MH STICK CYLINDER WITHOUT STICK LOWERING
CONTROL VALVES
(56) CYLINDER GP
1
(73) VALVE GP
CONTROL (HAMMER)
252-5984
MH STICK NOTE A
P
STICK
U
MB
T1
BRAKE VALVE
Z1
B
T
MIN
A3
T2
EB
MB
B
MR
MR
X
X
A
T
RELEASABLE CHECK
VALVE OP
A
K
MM
b3
B3
(80) VALE GP
PILOT (JOYSTICK STEERING)
242-9670
(51) ACCUM GP
RIDE CONTROL 340-3267
M
A1
B1
CAB UP / CAB DOWN
T
A
B
(88) VALE GP
SOLENOID
(RIDE CONRL)
299-3659
B
A
1
2
a3
SWIVEL
Y2
STICK
GENERATOR OP
12.5 KW
(60) MOTOR GP
GENERATOR
227-5999
T
B01
TO TANK
SW L
SW R
STICK
IN
4
6
3
A
B
HCR/OFFSET
OP
A
MEDIUM PRESSURE
FUNCTION OP
B
T
A
B
a4
b4
1
T
LUDV
A
X
MR
MR
X
A
T
1
2
UP
TO MAIN
VALVE
PORT P
Psta
STICK
SW L
SW R
STICK
IN
P
B5
4
2
b2
OUT
IN
T
P
B
MB
A
B
B
6
A
(92) VALVE GP
VA BOOM LOWERING
254-2677
T
A
a5
MR
X
A
T
4
1
2
1
1
FWD
REV
2
T
(74) CONTROL
QUICK COUPLER
340-3327
CONNECTS AT
LOCATION C-3
CONNECTS AT
LOCATION D-3
BOOM
DOWN
BCT CL
BCT OP
BOOM
A
X
MR
MR
X
A
T
P
T
P
B
L
B1
R
L
L
P
T
(69) VALVE GP
BOOM LOWERING
254-2675
Pst
B
A
b0
VA BOOM
OP
B0
A0
P
AUX 1
b5
B5
A5
b4
L B4
DOZER/
STABILIZER
BOOM
A4
X
PST
A’
Y
B
(33) VALVE GP
MAIN CONTROL
M316D 340-3336
M318D 265-7154
M318D MH 251-8026
M322D 251-8025
M322D MH 251-8027
b2
A
b3
(37) VALVE GP
STEERING
M316, M318
205-6215
M322D + MH’S
187-3774
Pst
L
a0
DA
K
MP
LS
P
P AUX 2
a5
a0
(66) VALVE GP 2nd HIGH PRESSURE
CONTROL
252-1269
S53
a4
B3
STICK
S52
A3
b2
B2
A2
b1
B1
BUCKET
A1
I
UP
JOYSTICK
RIGHT HAND
P
T
T
SHUT OFF BALL VALVES
(FOR SINGLE OR DOUBLE ACTING TOOL)
A’
X
a2
B01
G
A01
MULTI
COMBINED
VALVE OP
S5
T
E
PMP
a1
Psta
L
a01
CONNECTION POINT
FOR RIDE CONTROL OPTION
T
(81) VALVE GP
REV FAN 308-1191
(62) MOTOR GP
REV FAN 297-1571
REMOTE PRESSUE TAPS
P1
IMPLEMENT PUMP P2 LOAD SENSE
OUTLET PRESSURE PRESSURE
P3
PILOT PRESSURE P4 PILOT,STEERING
BRAKE,MPF,PUMP
OUTLET PRESSURE
P2
B
P4
T
(38) VALVE GP
STEERING PRIORITY
188-1814
P5
T
S
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT PUMP OUTPUT
PILOT PUMP OUTPUT
DOZER CYLINDER / STABILIZER CYLINDER CONTROL CIRCUIT
SWING PUMP SUPPLY CIRCUIT
VA BOOM CYLINDER CONTROL CIRCUIT
OSC AXLE CYLINDER CONTROL CIRCUIT
IMPLEMENT PUMP LOAD SENSE
K
B
1
2
M2
SA
GEAR
SHIFT
B
K
B
BB
LS
TRAVEL
MOTOR
CONTROL
PMP
MAIN
PUMP
CONTROL
SWING
PUMP
CONTROL
TO MAIN
VALVE
PORT P
Psta
A8
TO PILOT
MANIFOLD
PORT S
M8
A7
D7
M7
A6
M6
T1/1
A5
M5
T1/2
K
FF
DD
STEERING PRIORITY
P VALVE
S1
m2
TRAVEL BRAKE
VALVE
m1
GEAR 1
P
P
T
N
P
P1
b5
B5
(1) ACCUMULATOR GP
BRAKE 235-5646
A
(54) CYLINDER GP
BOOM NOTE A
SWING MOTOR
G
V g max
ENGINE
PS
R
FA
FA1
MB
T2
C
IMPLEMENT PUMP M322D /M322D MH
(DIFFERENT TO IMPLEMENT PUMP
M316D / M318D / M318D MH)
X
Z
MZ
X2
G
FS
MH
Z
R
M A
G
(24) PUMP GP
FAN
281-6269
MA
X1
T1
P
A
V g max
S
V g min
NOTE A: SEE PARTS MANUAL FOR SPECIFIC
CYLINDER PART NUMBERS
BB
(27) PUMP GP
PILOT / STEERING
BRAKE / AUX
M316D, M318D, M322D
329-5735
M318D MH, M322D MH
329-5736
ACCESS
FROM
GROUND
(26) PUMP GP
IMPLEMENT
M322D , M322D MH
251-8036
A
B
R1
CC
OFFSET BOOM CYLINDER / MEDIUM PRESSURE CONTROL CIRCUIT
B
V g min
M1
SWING MOTOR SUPPLY CIRCUIT
TRANSMISSION OIL CIRCULATION PUMP
FAN PUMP SUPPLY CIRCUIT
BRAKE CYLINDER CONTROL CIRCUIT
DOZER BLADE CYLINDER MH
FE
R2 T1 T2
(65) VALVE AS
CAB LOWERING (OUTSIDE)
226-9860
SWING MOTOR CONTROL CIRCUIT
MAIN PUMP CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
2ND HIGH PRESSURE OPTION
P8 JOYSTICK STEERING
FAN PUMP
OUTLET PRESSURE PRESSURE
MX
T2
ONLY M313D
S
INSIDE
CAB
P7
T1
M A
PILOT PUMP
(64) VALVE AS
CAB LOWERING (INSIDE)
226-9860
A5
Y1
(16) FILTER GP
PILOT
145-7750
B
(34) VALVE GP
PILOT MANIFOLD
254-2662
BOOM
Y3
IMPLEMENT PUMP
(2) ACCUMULATOR GP
BRAKE 235-5646
SP PST
MULTI COMBINATION TOOLS / HAMMER OPTION
TRAVEL MOTOR CONTROL CIRCUIT
P6
P5
P8
(14) FILTER GP
FAN 227-6000
(21) MOTOR GP
SWING
M316D 152-7374
M318D, M322D,
M318D MH,
AND M322D MH 152-7371
AA
(4) ACCUMULATOR GP
PILOT 8U-6159
b5
Y2
(28) PUMP GP
SWING
M316D: 190-8213
M318D + MH: 190-8199
M322D + MH: 196-8429
(18) FILTER GP
SWING PUMP
109-7288
Y1
S2
DS2
GEAR 2
Y2
LD
AEC
GG
HH
B2
DS
P
TRAVEL
ACTIVATION
VALVE
OR
TRAVEL
PILOT
CONTROL
(63) SOLENOID AS
IMPLEMENT
ALL VERSIONS
216-1397
CF
FAN PUMP
(76) VALVE GP
MANUAL BOOM
LOWERING
145-7166
A1
EF
SWING PUMP
PILOT
MANIFOLD
A2
SWING BRAKE
(50) ACCUMULATOR GP
BOOM DAMPING 255-8547
A3
OSC AXLE REST
SCHEMATIC FOR
MH BOOM CYLINDER
WITHOUT
BOOM LOWERING
CONTROL VALVES
A4
DS1
B1
IMPLEMENT LOCK
a5
EE
a3
HEAVY LIFT OP
(84) VALVE GP
SOLENOID
196-7486
HEAVY LIFT CONTROL OPTION
QUICK COUPLER CONTROL CIRCUIT
P7
S
D
STEERING CONTROL CIRCUIT
BUCKET CYL CONTROL CIRCUIT / BUCKET ADJ / GRAPPLE ROTATE
P6
REV
FAN
P
SUPPLY LINE
DRAIN / RETURN LINE
STICK CYLINDER CONTROL CIRCUIT
TRANSMISSION CLUTCH CONTROL CIRCUIT
(39) VALVE GP
TRAVEL BRAKE
322-0100
a5
B
Y
A
P3
MAIN VALVE SECTION
SPOOL BOOM CYLINDER
L
S51
a1
A
TO GEN
MOTOR
CASE DRAIN
BCT OP
BOOM
T
a2
a3
T
L
BCT CL
b1
TRAVEL
a3
a4
a5
(75) VALVE GP
CONTROL (VA BOOM)
251-8038
(20) MOTOR GP
FAN 281-6268
P
TO MAIN
VALVE
PORT
P AUX 2
DOWN
PST
T
A01
LUDV
BOOM
A5
LSX
TO MAIN
VALVE
PORT
LS AUX
SW R
IN
b01
LD
P
P
TO IMP
PUMP
PORT X
SW L
STICK
4
3
F
JJ
C
2
(79) VALVE GP
MULTI COMBINATION
252-5983
P1
TO MAIN
VALVE
PORT LS
1
DIVERTER BALL VALVES
BUCKET
b3
FAN MOTOR
TO TANK
4
(32) VALVE GP
DIVERTER BUCKET
290-9589
QUICK
DISCONNECT
TRAVEL
SPOOL
IN LARGED
VIEW
MAIN
RETURN
FILTER
B01
J
H
(40) VALVE GP
TRAVEL
BYPASS
265-7287
TRAVEL
BYPASS
(FT)
b4
(61) MOTOR GP
GENERATOR
GEN 152-7371
T
4
(67) VALVE GP
ANTI-DRIFT
M316D 254-0489
ALL OTHERS 254-0488
a3
Y
GENERATOR OP
15 KW
D
8
Psta
REMOTE PRESSUE TAPS
(72) VALVE GP
CONTRTOL
334-7445
2
X
UP
P
T
6
(77) VALVE GP
MANUAL SHUTOFF
277-0954
QUICK
DISCONNECT
(68) VALVE GP
ANTI-DRIFT (STICK)
M316D 254-0489
ALL OTHERS 254-0488
JOYSTICK
RIGHT HAND
T
3
OUT
P1
(31) VALVE GP
DIVERTER
BUCKET
290-9591
SMART BOOM OP
4
3
7
JOYSTICK
LEFT HAND
(8) CYLINDER GP
BUCKET NOTE A
(13) CYLINDER GP
STICK NOTE A
S52
A5
b1
a1
A01
3
STICK
b0
a2
2
1
0
JOYSTICK STEERING OP
B
JOYSTICK
LEFT HAND
BOOM
b5
a0
b0
OUT
(54) CYLINDER GP
BOOM NOTE A
b5
TO PILOT
MANIFOLD
PORT S
Y2
3
DOWN
PMP
b3
Y1
2
P
TO MAIN
VALVE
PORT
P AUX 2
X A
R
TRAVEL PEDAL
TO MAIN
VALVE
PORT
LS AUX
B
MR
(35) VALVE GP
(23) PEDAL GP
PILOT (BOOM / BUCKET)
TRAVEL VALVE
W / MAGNET 254-2685 243-4046
WO / MAGNET 254-2684
(52) VALVE GP
PILOT (VA BOOM)
112-5704
VA BOOM OP
A
(36) VALVE GP
PILOT (STICK / SWING)
243-4046
(6) CONTROL GP
HAND (STAB / BLADE)
257-6104
SWIVEL
A
“SPOOL IN
SPOOL”
DOZER STABILIZER
BOOM
E
A
PST
BLCV OP
MR
BLCV OP
BLCV OP
B
MA A
(29) SWIVEL GP
292-2769
MR
(89) VALE GP
SOLENOID (SMART BOOM)
265-7156
JOYSTICK STEERING
PRIORITY PRESSURE
COMPENSATOR. ONLY
INSTALLED WITH
JOYSTICK STEERING
VALVE
P
1
A
(69) VALVE GP
BOOM LOWERING
254-2675
(69) VALVE GP
BOOM LOWERING
254-2675
2
3
5
A
4
0
TO BE CONNECTED
IF SMART BOOM IS
NOT INSTALLED.
(50) ACCUMULATOR GP
BOOM DAMPING 255-8547
(76) VALVE GP
MANUAL BOOM LOWERING
145-7166
B
B
BOOM
B5
T
SCHEMATIC FOR MH BOOM CYLINDER
WITH BOOM LOWERING CONTROL
VALVES (OPTIONAL)
A01
5
B
X MR
JOYSTICK
LEFT HAND
P
P
VALVE GP
PILOT (STICK / SWING)
SEE LOCATIONE-13
OUT
GEN
F
1
(29) SWIVEL GP
292-2769
HAMMER OP
Possible configurations BLCV,SLCV,Anti Drift Valves M300D
Item
Anti Drift
Number
Valve
Location
BLCV SLCV OR
X
X
X
7
Boom Head End
X
X
X
92
VA Boom Head End
X
Stick Head End
13
X
X
X
13
Stick Rod End
X
31
Bucket Head End
Note: Not all configurations shown on Hydraulic Schematic.
2ND HIGHPRESSURE OP
(71) VALVE GP
CONTRTOL
192-3177
2
4
3
QUICK COUPLER OP
BLCV OP
B
(87) VALE GP
SOLENOID (RH)
295-7689
(78) VALE GP
MEDIUM PRESS. CONT.
MPF ONLY 254-2643
MPF AND OFFSET 254-2644
MPF AND JOYSTICK STEER 254-2646
MPF, OFFSET AND JOYSTICK STEER 254-2647
MPF AND HCR 304-9344
MPF, HCR AND JOYSTICK STEER 304-9345
3
(7) CYLINDER GP
BOOM NOTE A
(69) VALVE GP
BOOM LOWERING
254-2675
BLCV OP
SMART BOOM OP
G
2
(58) CYLINDER GP
QUICK COUPLER
NOTE A
VA BOOM
A
B
HYDRAULIC CAB RISER
1
6
5
b0
b5
Y1
(59) CYLINDER GP
VA BOOM NOTE A
(51) ACCUM GP
RIDE
CONTROL
340-3267
JOYSTICK STEERING V. OP
A
1
3
STICK
BLCV
A
BUCKET ADJUST
T
b5
5
P
BLCV
G
2
KK
A
6
1
TO MAINVALVE SECTION
DOZER/STABILIZER B4
BOOM
GRAPPLE ROTATE
4
T
P
A
PST
DS
PILOT
MANIFOLD
(85) VALE GP SOLENOID (LH) 295-7688
A3
5
T
MK
RIDE CONTROL OPTION
(53) CYLINDER GP
CAB RISER NOTE A
STICK
H
M1
V2
B
LS
STEERING
CYLINDER
MA
NN
OFFSET BOOM TILT
a5
B01
AEC
C2
V1
SA
MAIN VALVE
A
C1
BB
P
TO MAINVALVE SECTION
DOZER/STABILIZER A4
IN
T
A
B
B1
Z2
LS AUX
B
A
WHEEL
BRAKE
A
EK
(57) CYLINDER GP OFFSET BOOM TILT NOTE A
(70) VALVE GP
CHECK
238-7021
A
(86) VALVE GP
SOLENOID
(MH DOZER SHUTOFF)
291-6475
TO PORT P AT
DOZER/STABILIZER
VALVES
STABILIZER SHUT OFF VALVE OP
P
(12) CYLINDER GP
STEERING NOTE A
FWD
SLCV OP
MR
SLCV OP
MAX
MS
SCHEMATIC FOR MH STICK CYLINDER WITH STICK LOWERING
CONTROL VALVES (OPTIONAL)
(91) VALVE GP
(91) VALVE GP
STICK LOWERING CONT
STICK LOWERING
254-2676
(56) CYLINDER GP
CONT
MH STICK NOTE A
254-2676
b3
S
GEAR
I
OSC. AXLE LOCK
REV
a3
T1
G
TRAVEL
MOTOR
THIS HOSE ROUTING IS VALID
IF THE MACHINE IS EQUIPPED WITH A
JOYSTICK PATTERN CHANGER
(90) VALVE GP
SOLENOID
196-7543
MLS
B3
L
TO PORT B AT
DOZER/STABILIZER
CYLINDER
B1
ANTI DRIFT VALVE OP
DOZER SHUT OFF VALVE
DOZER BLADE
(9) CYLINDER GP
DOZER BLADE NOTE A
EL
(11) CYLINDER GP
STABILIZER NOTE A
(10) CYLINDER GP
OSC. AXLE LOCK
NOTE A
(22) MOTOR GP
TRAVEL
M316D, M318D, M322D AND
M318D MH, M322D MH 291-3711
LL
Z1
b3
X
STABILIZER
WHEEL BRAKE
CLUTCH
RELEASE
B
(FOR M313D...M316D POSITION OF THE INLET
ELEMENT IS BETWEEN STICK AND TRAVEL)
(83) VALVE GP
SOLENOID 196-7544
A
OUT
J
(3) ACCUM GP
OSC. AXLE 8U-2624
PATTERN CHANGER OP
G
STICK
S
M1
R1
R2 T1 T2
(25) PUMP GP
IMPLEMENT
M316D 251-8032
M318D, M318D MH 251-8034
B
LINE PATTERNS
LOCATION B-7
FOR TAP DESIGNATION
Pressure Line
Pilot / Load Sensing Pressure
Drain / Return Lines
Component Group
Attachment
Air Line
CALLOUTS
MAIN
RETURN
FILTER
a5
MAIN VALVE SECTION
SPOOL BOOM CYLINDER
(5) CAP
BREATHER
194-7849
TANK
(19) FILTER GP
TRAVEL MOTOR
8U-0198
BREATHER CAP
A
(30) TANK AS
M316D 338-8199
M318D 321-8799
M322D 338-8189
M318D MH 338-8319
M322D MH 338-8329
(17) FILTER GP
SWING PUMP
& IMP PUMP
DRAIN
8U-0198
MAIN
RETURN
FILTER
(15) FILTER GP
MAIN PUMP
M316D 193-5973
M318D, M322D AND MH’S 290-5479
Taps (Pressure, Sampling, Sensor - by letter)
52
Components (By number)
THIS SCHEMATIC IS FOR THE M316D, M318D, M322D, M320D2 AND M322D2 WHEELED EXCAVATOR
M318D MH, M322D MH, M322D2 MH, AND M324D2 MH MATERIAL HANDLER HYDRAULIC SYSTEM
MEDIA NUMBER: UENR1259-06
SCHEMATIC PART NUMBER (MACHINE): 361-4819, CHANGE: 00, VERSION: EY
SCHEMATIC PART NUMBER (CYLINDER MH): 308-7476, CHANGE: 02, VERSION: EY
SCHEMATIC PART NUMBER (RIDE CONTROL): 318-8778, CHANGE: 00, VERSION: EY
N1
N2
N3
a5
YY
Components are shown installed on a fully operable machine with the key switch and engine off, armrest position switch up,
limit switches with opened windows, and transmission control in neutral position.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
A
VALVE GROUP VIEW
VIEW ALL CALLOUTS
OSC AXLE REST
SWING BRAKE
HEAVY LIFT
IMP LOCK
GEAR SHIFT
84
34
JJ
4
HH
GG
TRAVEL
MOTOR
SWING
PUMP
MAIN
PUMP
TRAVEL
PILOT
VA BOOM VIEW
VIEW ALL CALLOUTS
92
59
STANDARD UNDERCARRIAGE VIEW
29
VIEW ALL CALLOUTS
90
10
11
11
12
90
3
22
LL
KK
NN
MM
STANDARD BOOM AND STICK VIEW
VIEW ALL CALLOUTS
8
13
7
RIDE CONTROL VIEW
VIEW ALL CALLOUTS
85
87
88
51
REVERSE FAN VIEW
VIEW ALL CALLOUTS
81
62
REAR DOZER VIEW D SERIES
83
9
VIEW ALL CALLOUTS
QUICK COUPLER CYLINDER VIEW
VIEW ALL CALLOUTS
8
58
PATTERN CHANGER OPTION VIEW
VIEW ALL CALLOUTS
82
OFFSET BOOM VIEW
VIEW ALL CALLOUTS
70
57
MATERIAL HANDLER DOZER BLADE VIEW
86
55
VIEW ALL CALLOUTS
MATERIAL HANDLER BOOM VIEW
VIEW ALL CALLOUTS
91
56
50
54
76
69
MATERIAL HANDLER BELOW CAB COMPONENTS VIEW
2
39
37
DD
FF
EE
1
16
VIEW ALL CALLOUTS
MEDIUM PRESSURE CONTROL VIEW
VIEW ALL CALLOUTS
HCR / OFFSET
MEDIUM PRESS
GRAPPLE / ADJ
JOYSTICK
STEERING
78
MATERIAL HANDLER AND OPTIONAL COMPONENTS VIEW
53
78
89
75
68
26
80
73
79 67
74
VIEW ALL CALLOUTS
HYDRAULIC CAB RISER VIEW
VIEW ALL CALLOUTS
65
ON THE
LH SIDE
RH CAB VIEW
64
ON THE
RH SIDE
OF CAB
FLOOR
D SERIES STANDARD HYDRAULIC COMPONENTS VIEW
VIEW ALL CALLOUTS
14 66 34
68
16
1
2
38
EE
37
20
17
15
30
CC
5
33
24
FF
40
AA
BB
18
63
28
25
19
21 27
DD
D SERIES CAB COMPONENTS VIEW
VIEW ALL CALLOUTS
36
35
6
23 39
52
BUCKET CYLINDER OPTIONS VIEW
31
32
VIEW ALL CALLOUTS
8
77
15 KW GENERATOR VIEW
72
61
VIEW ALL CALLOUTS
12.5 KW GENERATOR VIEW
71
60
VIEW ALL CALLOUTS