SURFACE MINING EXTRACTION EQUIPMENT PART C Caterpillar Performance Handbook ® Edition 44 800.437.4228 www.hawthornecat.com © 2014 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, BUILT FOR IT, their respective logos, “Caterpillar Yellow,” the “Power Edge” trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission. ELECTRIC ROPE SHOVELS CONTENTS ELECTRIC ROPE SHOVELS Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . Digging Envelopes. . . . . . . . . . . . . . . . . . . . . . . . General Dimensions . . . . . . . . . . . . . . . . . . . . . . Ground Bearing Pressure . . . . . . . . . . . . . . . . . . Dipper Selection . . . . . . . . . . . . . . . . . . . . . . . . . Truck Match . . . . . . . . . . . . . . . . . . . . . . . . . . . . FEATURES 16-29 16-29 16-32 16-35 16-42 16-49 16-50 16-51 AC IGBT Electrics With over 30 years of AC experience and over 200 operating AC machines, Bucyrus led the industry in AC electric rope shovels. Caterpillar will carry on this proud tradition. Since its launch in 1981, the AC electric rope shovel has gained strong industry acceptance. ● Superior availability: AC IGBT electric rope shovels have routinely demonstrated electrical availabilities of greater than 98%. ● Greater reliability: Fewer components including interchangeable inverters. IGBT systems require no fuses or circuit breakers. ● Reduced maintenance: No regular maintenance is required on IGBT power control modules. Motor maintenance on AC machines is reduced to greasing and replacing bearings every 30,000 hours. ● Reduced inventory: Cat IGBT is a mine quality system with rugged welded cabinets to withstand harsh mining conditions. INTRODUCTION Electric rope shovels are one of the largest loading tools on the market. They run in a truck-shovel operation with mining trucks in order to move large quantities of material at a low cost per ton. Electric rope shovels are used to mine a variety of minerals including oil sands, coal overburden, copper, gold, iron ore, etc. They operate at extreme climates in tough surface mining applications all over the world. 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 29 16-29 12/20/13 8:54 AM Electric Rope Shovels Features Robust Front End Design The Cat free-floating tubular handle design presents many benefits over traditional rack-and-pinion systems, including: ● Fast swing times: The Cat deck-mounted, rather than boom-mounted, crowd machinery greatly reduces front end weight for reduced swing inertia and fast swing times. ● Elimination of torsional loading: The free-floating handle design allows the Cat handle to rotate under torsional stress, transferring stress into the ropes rather than into the boom. ● Improved line of sight: Cat machines provide operators with a much-improved left-hand line of sight by moving around the crowd machinery from the boom to the deck. ● Efficient digging: Wide-set boom point sheaves stabilize the dipper as it engages the bank for easier and more efficient digging. Cat Cab Caterpillar’s state-of-the-art operator’s cab is the product of a multi-year collaboration between Caterpillar, mining companies and shovel operators. The cab provides industry-leading visibility with excellent line of sight supplemented by five optimally-mounted cameras and display screens. It provides enhanced safety through dual access/egress doors and an optimally-placed trainer seat with independent emergency stop. Additionally, the new cab offers the smoothest, most comfortable ride available with an ergonomic, adjustable operator’s seat with a fully pneumatic suspension system, low-effort joysticks and dual display screens optimized for operator comfort. Power Demand Management System Caterpillar’s exclusive Power Demand Management System for 7495 Series machines allows an electric rope shovel to operate in spite of electrical infrastructure challenges. This patented energy storage and power management technology reduces the number of generators required to run an electric rope shovel, giving mines the option of production without grid power. Additionally, this technology lowers the machine’s peak power requirement, resulting in more alternatives when mines plan for power. 16-30 HydraCrowd™ HydraCrowd represents the first new crowd technology developed in the past 70 years. A hydraulic cylinder inside the tubular dipper handle maintains all the benefits of the Cat front end while eliminating the need for routine crowd/retract rope replacements. HydraCrowd cuts downtime by reducing the number of maintenance events needed to keep the machine operational. HydraCrowd is controlled with proven Cat IGBT technology and has complete diagnostic and troubleshooting information with step-by-step instructions. It is designed to operate in all climates to ensure each shovel will be able to deliver maximum productivity in the harshest conditions. LatchFree™ The LatchFree Dipper System is Caterpillar’s solution to customers’ number-one cause of downtime — the latch assembly. The LatchFree dipper eliminates the latch assembly, replacing it with a strong steel link mounted to the dipper back — away from material flow. The system enhances safety by reducing the number of maintenance events required to maintain the system and increase reliability by reducing unplanned downtime. The LatchFree dipper system comes complete with a comprehensive training program to ensure customers achieve maximum system benefits. FastFil™ Dipper Design The unique FastFil dipper provides customers with faster and fuller dipper loads where the application permits. Its trapezoidal shape accommodates the natural configuration of the load, eliminating voids that occur with box-shaped dippers for improved fill factors. The trapezoidal shape also reduces dipper size and weight for improved maneuverability and faster swing times. Additionally, optimized lip and rake angles lead to improved bank penetration and eliminate bulldozing for reduced material turbulence. Finally, a shorter dipper body cuts load and dump time. Combined, FastFil features optimize fill factor. Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 30 12/20/13 8:54 AM Features AccessDirect™ AccessDirect is an electrical interface system that facilitates remote access to a machine’s onboard computer via the Internet. With AccessDirect, maintenance personnel can analyze faults from off-site locations and arrive on-site prepared to resolve the issues — leading to reduced machine downtime. AccessDirect also enables factory experts to remote-access and troubleshoot faults, resulting in superior response times and reduced mean time to repair. MIDAS The MIDAS health monitoring system continues to optimize machine performance by providing, logging and analyzing data on a variety of machine variables. MIDAS comes complete with a built-in report generator that outputs data in a format that can be easily analyzed to identify opportunities to improve machine performance. When paired with AccessDirect, MIDAS provides real-time monitoring of shovel operation and provides users with a 3D model to watch the shovel in motion. AccuLoad AccuLoad is a data analysis system that provides real-time feedback on dipper loads. AccuLoad’s load calculation is accomplished without mechanical sensors, eliminating the need for recalibration, a common problem with other load-weighing systems. The system can be employed to calculate material moved, to monitor overloading of trucks or to allow operators to study their load and shift performance. It can also log operator performance data which, when paired with MIDAS, can generate reports to help identify training opportunities to increase shift production. Electric Rope Shovels Major Structures Cat major structures are designed for extended performance in harsh mining conditions. Structures are manufactured using cold-weather, impact-resistance, high-strength steel with select welds of full-penetration, profiled and ground type. All welds undergo visual inspection, with critical welds also receiving MT, UT or X-ray inspection. Large furnaces are used to stressrelieve entire weldments for reduced susceptibility to cracking. Interiors of finished structures are painted white to facilitate field inspection. Safety Safety plays an integral role in everything we do at Caterpillar, from our factory floors to our service centers to our clients’ mine sites. Caterpillar’s commitment to safety is apparent in our product designs, which undergo risk assessments and are designed to meet strict codes and regulations. Examples of our safety focus include the development of a cab with dual egress doors and flat floors to provide stretcher-to-operator access, LatchFree dipper and HydraCrowd for reduced unplanned maintenance, and extensive training programs to help keep your operators and maintenance personnel out of harm’s way. Additionally, the electric rope shovel product line has incorporated additional safety product enhancements as part of Caterpillar’s engagement and dedication to the Earth Moving Equipment Safety Round Table or EMESRT. 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 31 16-31 12/20/13 8:54 AM Electric Rope Shovels Specifications MODEL Payload Operating Weight Dipper Range Drive Distribution System Requirements (separate system) Distribution System Requirements (large system) Average 15 Minute Demand Peak Power Crowd Type Hoist Ropes Number Diameter Type Construction Crowd/Retract Ropes Number Diameter Type Construction 16-32 7295 7395 45 tonnes 50 tons 789 251 kg 1,740,000 lb 19.1-38.3 m³ 25-50 yd³ AC IGBT 2000 kVA 1320 kVA 538-753 kW 2152 kW Tubular handle rope crowd 64 tonnes 70 tons 1 288 656 kg 2,841,000 lb 20.7-55.8 m³ 27-73 yd³ AC IGBT 3500 kVA 2000 kVA 777-1087 kW 3106 kW Tubular handle rope crowd 2 57 mm 2.25" Twin dual 6×41 2 70 mm 2.8" Twin dual 8×37 1 crowd, 1 retract 60 mm 2.4" Single dual 8×37 1 crowd, 1 retract 64 mm 2.5" Single dual 8×37 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 32 12/20/13 8:54 AM Specifications MODEL Payload Operating Weight Dipper Range Drive Distribution System Requirements (separate system) Distribution System Requirements (large system) Average 15 Minute Demand Peak Power Crowd Type Hoist Ropes Number Diameter Type Construction Crowd/Retract Ropes Number Diameter Type Construction Electric Rope Shovels 7495 HD 7495 7495 HydraCrowd 82 tonnes 90 tons 1 306 346 kg 2,880,000 lb 27.5-60.4 m³ 36-79 yd³ AC IGBT 109 tonnes 120 tons 1 369 246 kg 3,018,670 lb 30.6-62.7 m³ 40-82 yd³ AC IGBT 109 tonnes 120 tons 1 382 400 kg 3,047,670 lb 30.6-62.7 m³ 40-82 yd³ AC IGBT 3500 kVA 4000 kVA 4000 kVA 2000 kVA 832-1165 kW 3330 kW Tubular handle rope crowd — 926-1297 kW 3706 kW Tubular handle rope crowd — 945-1322 kW 3778 kW Tubular handle HydraCrowd 2 70 mm 2.8" Twin dual 8×37 2 70 mm 2.8" Twin dual 8×37 1 crowd, 1 retract 64 mm 2.5" Single dual 8×37 1 crowd, 1 retract 64 mm 2.5" Single dual 8×37 2 70 mm 2.8" Twin dual 8×37 N/A N/A N/A N/A N/A = Not Available. 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 33 16-33 12/20/13 8:54 AM Electric Rope Shovels Specifications MODEL Payload Operating Weight Dipper Range Drive Distribution System Requirements (separate system) Average 15 Minute Demand Peak Power Crowd Type Hoist Ropes Number Diameter Type Construction Crowd/Retract Ropes Number Diameter Type Construction 7495 HF 7495 HF HydraCrowd 109 tonnes 120 tons 1 429 120 kg 3,150,670 lb 30.6-62.7 m³ 40-82 yd³ AC IGBT 4000 kVA 926-1297 kW 3706 kW Tubular handle rope crowd 109 tonnes 120 tons 1 442 274 kg 3,179,670 lb 30.6-62.7 m³ 40-82 yd³ AC IGBT 4000 kVA 945-1322 kW 3778 kW Tubular handle HydraCrowd 2 70 mm 2.8" Twin dual 8×37 1 crowd, 1 retract 64 mm 2.5" Single dual 8×37 2 70 mm 2.8" Twin dual 8×37 N/A N/A N/A N/A N/A = Not Available. 16-34 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 34 12/20/13 8:54 AM Digging Envelopes ● 7295 Electric Rope Shovels m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 7295 9.22 m 7.00 m 18.69 m 15.56 m 21.78 m 9.45 m 30'3" 23'0" 61'4" 51'1" 71'5" 31'0" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 35 16-35 12/20/13 8:54 AM Electric Rope Shovels Digging Envelopes ● 7395 m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 16-36 7395 10.00 m 7.91 m 20.50 m 16.70 m 23.30 m 14.30 m 32'11" 25'11" 67'2" 54'11" 76'5" 47'0" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 36 12/20/13 8:54 AM Digging Envelopes ● 7495 HD Electric Rope Shovels m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 7495 HD 10.60 m 8.45 m 21.00 m 17.30 m 23.97 m 14.30 m 34'10" 27'9" 69'0" 56'10" 78'8" 47'0" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 37 16-37 12/20/13 8:54 AM Electric Rope Shovels Digging Envelopes ● 7495 m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 16-38 7495 10.06 m 8.61 m 21.64 m 17.80 m 25.20 m 14.30 m 33'0" 28'3" 71'0" 58'5" 82'8" 47'0" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 38 12/20/13 8:54 AM Digging Envelopes 7495 HydraCrowd ● Electric Rope Shovels m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 7495 HydraCrowd 10.06 m 8.61 m 21.64 m 17.80 m 25.20 m 14.30 m 33'0" 28'3" 71'0" 58'5" 82'8" 47'0" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 39 16-39 12/20/13 8:54 AM Electric Rope Shovels Digging Envelopes ● 7495 HF m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 16-40 7495 HF 10.06 m 8.61 m 21.64 m 17.80 m 25.20 m 14.30 m 33'0" 28'3" 71'0" 58'5" 82'8" 47'0" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 40 12/20/13 8:54 AM ● Digging Envelopes 7495 HF HydraCrowd Electric Rope Shovels m ft m ft MODEL Dumping Height Dumping Height at Maximum Crowd Limit Dumping Radius Cutting Height Cutting Radius Effective Length of Dipper Handle 7495 HF HydraCrowd 10.06 m 8.61 m 21.64 m 17.80 m 25.20 m 14.30 m 33'0" 28'3" 71'0" 58'5" 82'8" 47'0" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 41 16-41 12/20/13 8:54 AM General Dimensions ● 7295 CL ROTATION CL ROTATION Electric Rope Shovels MODEL Boom Length A B C D E F G H I 16-42 Height 7295 18.00 m 59'0" 18.15 m 59'7" A-Frame Height 11.94 m 39'2" Overall Width 12.39 m 40'8" Tail Swing Radius 7.98 m 26'2" Clearance Radius 17.48 m 57'4" Radius of Level Floor 15.58 m 51'1" Minimum Ground Clearance 0.78 m 2'6" Track Length 10.26 m 33'8" Operator Eye Level 8.20 m 26'11" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 42 12/20/13 8:54 AM General Dimensions ● 7395 MODEL Boom Length A B C D E F G H I Electric Rope Shovels 7395 19.51 m 64'0" Height 19.50 m 63'11" A-Frame Height 13.30 m 43'8" Overall Width 13.01 m 42'8" Tail Swing Radius 8.67 m 28'5" Clearance Radius 19.05 m 62'6" Radius of Level Floor 15.40 m 50'6" Minimum Ground Clearance 0.86 m 2'10" Track Length 10.41 m 34'2" Operator Eye Level 8.64 m 28'4" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 43 16-43 12/20/13 8:54 AM Electric Rope Shovels General Dimensions ● 7495 HD MODEL Boom Length A B C D E F G H I 16-44 7495 HD 20.40 m 67'0" Height 20.10 m 65'10" A-Frame Height 13.30 m 43'8" Overall Width 13.01 m 42'8" Tail Swing Radius 8.67 m 28'5" Clearance Radius 19.74 m 64'9" Radius of Level Floor 16.92 m 55'6" Minimum Ground Clearance 0.86 m 2'10" Track Length 10.41 m 34'2" Operator Eye Level 8.64 m 28'4" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 44 12/20/13 8:54 AM General Dimensions ● 7495 MODEL Boom Length A B C D E F G H I Electric Rope Shovels 7495 20.40 m 67'0" Height 20.87 m 68'6" A-Frame Height 14.00 m 46'0" Overall Width 13.11 m 43'0" Tail Swing Radius 9.34 m 30'8" Clearance Radius 19.65 m 64'5" Radius of Level Floor 17.47 m 57'4" Minimum Ground Clearance 0.90 m 3'0" Track Length 11.43 m 37'6" Operator Eye Level 10.61 m 34'10" 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 45 16-45 12/20/13 8:54 AM Electric Rope Shovels General Dimensions ● 7495 HydraCrowd MODEL Boom Length A B C D E F G H I 16-46 7495 HydraCrowd 20.40 m 67'0" Height 20.87 m 68'6" A-Frame Height 14.00 m 46'0" Overall Width 13.11 m 43'0" Tail Swing Radius 9.34 m 30'8" Clearance Radius 19.65 m 64'5" Radius of Level Floor 17.47 m 57'4" Minimum Ground Clearance 0.90 m 3'0" Track Length 11.43 m 37'6" Operator Eye Level 10.61 m 34'10" Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 46 12/20/13 8:54 AM General Dimensions ● 7495 HF MODEL Boom Length A B C D E F G H I Electric Rope Shovels 7495 HF 20.40 m 67'0" 20.87 m 68'6" A-Frame Height 14.00 m 46'0" Overall Width 13.96 m 46'1" Tail Swing Radius 9.34 m 30'8" Clearance Radius 19.65 m 64'5" Radius of Level Floor 17.47 m 57'4" Minimum Ground Clearance 0.90 m 3'0" Track Length 11.43 m 37'6" Operator Eye Level 10.61 m 34'10" Height 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 47 16-47 12/20/13 8:54 AM Electric Rope Shovels General Dimensions ● 7495 HF HydraCrowd MODEL Boom Length A B C D E F G H I 16-48 7495 HF HydraCrowd 20.40 m 67'0" 20.87 m 68'6" A-Frame Height 14.00 m 46'0" Overall Width 13.96 m 46'1" Tail Swing Radius 9.34 m 30'8" Clearance Radius 19.65 m 64'5" Radius of Level Floor 17.47 m 57'4" Minimum Ground Clearance 0.90 m 3'0" Track Length 11.43 m 37'6" Operator Eye Level 10.61 m 34'10" Height Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 48 12/20/13 8:54 AM Ground Bearing Pressure GROUND BEARING PRESSURE conditions. Selecting links that require higher ground bearing pressure than what exists at site will make propelling the machine difficult. A link too narrow for the application may even cause the crawlers to sink into the ground. Ground bearing pressure, or the amount of weight that can be supported by ground conditions, determines the link width (and occasionally the machine model) that can be used at a mine site. Softer ground conditions require wider links while the softest conditions (i.e. oil sands) require a specific model (7495 HF) which was designed to operate under low ground bearing pressure MODEL Standard Link Length Ground Bearing Pressure Optional Link Length Ground Bearing Pressure The chart below lists the link length options for each electric rope shovel model as well as the corresponding minimum ground bearing pressures. 7295 140 cm 372 kPa 183 cm 284 kPa 7395 55" 53.9 psi 72" 41.2 psi Electric Rope Shovels 213 cm 395 kPa 274 cm 308 kPa MODEL 7495 HydraCrowd Standard Link Length Ground Bearing Pressure Optional Link Length Ground Bearing Pressure 200 cm 374 kPa 259 cm 289 kPa 79" 54.2 psi 102" 50 psi 7495 HD 84" 57.4 psi 108" 44.6 psi 213 cm 401 kPa 274 cm 311 kPa 7495 HF 318 cm 245 kPa 356 cm 219 kPa 125" 35.6 psi 140" 31.8 psi 7495 84" 58.1 psi 108" 45.2 psi 200 cm 372 kPa 259 cm 288 kPa 79" 53.9 psi 102" 41.8 psi 7495 HF HydraCrowd 318 cm 248 kPa 356 cm 221 kPa 125" 35.9 psi 140" 32.1 psi 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 49 16-49 12/20/13 8:54 AM Electric Rope Shovels Dipper Selection DIPPER SELECTION density, divide insitu (undisturbed material density) by 1 + swell factor. Selecting the correct dipper size plays an integral role in maximizing productivity from a truck shovel operation. Optimal dipper size is a function of truck size, material loose density, and fill factor. Material loose density = Insitu (1 + swell factor) The first step in calculating dipper size is to determine the machine’s optimal payload based on truck size. To calculate this, divide truck payload by three and four (three or four pass even loading is ideal for high productivity). Compare these values to the machine’s maximum payload. The machine’s optimal payload is the largest value that is less than the maximum payload. Once material loose density is calculated, use the equation below to find the optimal dipper size. For example, consider a mine operating a 7495 shovel (maximum payload = 120 tons) and 797 trucks (payload = 400 tons). 400 ÷ 3 = 133.3 and 400 ÷ 4 = 100. 133.3 can be eliminated as it is greater than the shovel’s maximum payload (120 tons). 100 tons is the largest value less than the machine’s maximum payload, and therefore, is the machine’s optimal payload. For example: For a mine with the following conditions: Optimal machine payload Optimal dipper size = × Fill factor Material loose density Insitu: 2.276 ton/yd³ Swell factor: 35% Fill factor: 95% Optimal machine payload: 100 tons Optimal dipper size = Once optimal machine payload is determined, material loose density and fill factor are used to calculate the optimum dipper size. To calculate material loose MODEL Dipper Range MODEL Dipper Range 16-50 7295 19.138.3 m³ 7395 2550 yd³ 20.755.8 m³ 7495 HydraCrowd 30.6-62.7 m³ 40-82 yd³ 100 tons × .95 = 62.5 yd³ 2.276 ÷ (1 + 0.35) 7495 HD 2773 yd³ 27.560.4 m³ 7495 HF 30.6-62.7 m³ 40-82 yd³ 7495 3679 yd³ 30.662.7 m³ 4082 yd³ 7495 HF HydraCrowd 30.6-62.7 m³ 40-82 yd³ Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 50 12/20/13 8:54 AM Truck Match Electric Rope Shovels TRUCK MATCH Truck shovel match, or the number of passes necessary to load a truck, has a major impact on an operation’s productivity. To optimize productivity, 3 to 4 even pass loading of trucks is ideal. The chart below shows pass match between Cat electric rope shovels and Cat trucks. MODEL 772G 773G 775G 777G MT3300 AC 785D 789D MT3700 AC MT4400 AC 793F 795F AC MT5500 AC MT6300 AC 797F Payload 7295 7395 7495 HD 7495 7495 HF tonne (ton) 45 (50) 64 (70) 82 (90) 109 (120) 109 (120) 45 (50) 57 (63) 65 (72) 97 (107) 2 136 (150) 3 2 2 136 (150) 3 2 2 2 181 (200) 4 3 186 (205) 4 3 2 221 (244) 5 4 3 2 2 227 (250) 5 2 4 3 2 313 (345) 5 4 3 3 326 (360) 5 4 3 3 363 (400) 4 4 4 363 (400) 4 4 4 16 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 51 16-51 12/20/13 8:54 AM Notes — 16-52 Edition 44 PHB-Sec16-ElectricRopeShovels(pg029-052).indd 52 12/20/13 8:54 AM