2015 Caterpillar Unit Rig MT3700DC Truck Parts Manual – MT3700B DC Drive MJ312-MJ322

Description

2015 Caterpillar Unit Rig MT3700DC Parts Manual – Complete Coverage for MT3700B DC Drive Trucks

This is the complete parts manual for the Caterpillar / Unit Rig MT3700DC truck in DC drive configuration, published December 2015 under document number OCP MJ 312-322. It covers eleven trucks in the MJ312 through MJ322 serial number range and provides full parts identification, exploded assembly views, and service part drawings for every major system on the machine – from the Cummins K2000E engine and GE 5GTA26F3 alternator through to the wheel motors, brakes, hydraulic systems, cab, and dump body. Every numbered item in the illustrations maps directly to a part number, description, and quantity in the accompanying bill of material, making this manual the primary reference for anyone ordering, identifying, or replacing components on these trucks.

File Details

• Manual Type: Parts Manual (Parts Catalog)
• Brand: Caterpillar / Unit Rig
• Model: MT3700DC (MT3700B DC Drive Version)
• Document Number: OCP MJ 312-322
• Publication Date: December, 2015
• Serial Number Range: MJ312 through MJ322 (11 trucks)
• Language: English
• File Format: PDF
• Page Count: 887 pages

Chapters Covered

The manual is organised into 14 primary sections, each dedicated to a major system or group of components on the truck:

• Section 00 – Cover and Table of Contents
• Section 01 – How to Use This Parts Manual / Reference Index: Alphabetical index, service part drawing cross-reference
• Section 02 – Body and Structural Components: Body decals, body mounting, cab and superstructure mounting, dump body assembly, dump body lockup, fire extinguisher, frame brackets, fuel tank, hood and grill, ladders and railings, mirrors, mud guards, paint, rock deflectors, rock ejector, safety signs, superstructure floor plates
• Section 03 – Electrical System: 24V electrical assembly, battery box mounting, battery, contactor barrier, control box, dump body up assembly, emergency engine kill, ground cable, head/tail/clear lights, power and excitation assembly, retarding grid assembly, reverse warning horn, WPTU toolbox software
• Section 04 – Engine and Cooling: Air cleaner assembly, alternator and wheel cooling, battery charging alternator, drive system alternator, engine and alternator mounting, engine electrical assembly, engine piping, diesel engine K2000E, exhaust assembly, radiator mounting, radiator piping
• Section 05 – Hydraulics: Auto apply brake assembly, dump cylinder mounting, hydraulic brake system, hydraulic dump assembly, hydraulic oil cooler, hydraulic pump drive, hydraulic steering assembly, hydraulic tank
• Section 06 – Auto Lube and Central Service: Automatic lubrication system, central service assembly
• Section 07 – Axle and Wheel Components: Front axle assembly, axle box, front wheel assembly (oil bath), hub cap assembly, jackpad/skid plate, rim assembly 29x57x6, mechanical steering assembly, front suspension, rear suspension, wheel motor 5GE787FS11
• Section 08 – Brake Assemblies: Front brake assembly, rear brake assembly
• Section 09 – Cab and Operator Station: Air conditioner, brake drag warning, cab configuration, cab electrical, cab gauges, cab shifter, cab/ROPS with ABS and electric windows, dash and shroud, electronic throttle, engine shutdown delay, harness installation, heater, restriction indicator, radio, retard pedal, ROPS certification label, seat assembly, seat belt, speedometer and tachometer, steering column, park brake warning system, windshield washer, windshield wiper
• Section 10 – Weigh System: Access database template, alarm assembly, load display, weigh system program, wiring kit
• Section 11 – Service Tools and Consumables: Computer kit (laptop), chassis grease, nitrogen charging kit, suspension oil charging kit, engine module lifter, engine oil 15W40, compressor oil, hydraulic oil VG68, synthetic oil ISO680, O-ring kit, truck lift assembly
• Section 12 – Service Part Drawing Cross Reference: Detailed service parts drawings and bills of material for individual components including accumulators, air cleaners, alternators, batteries, brake calipers, clamp assemblies, compressor clutches, contactors, controllers, cylinders, doors, driveshafts, engines, exciters, filters, gauges, glass, harnesses, injectors, interlocks, manifolds, motors, panels, pedals, pumps, radiators, receivers, relays, resistors, retarding grids, reversers, rims, seats, steering columns, valve stems, suspensions, switches, throttles, transmitters, turn signals, U-joints, covers, valves, vent valves, wheel motors, windshields, wiper drives, and wire harnesses
• Section 13 – Schematics: 24 VDC electrical schematic, 24 VDC electrical schematic (options), chassis lube requirements, front wheel bearing lube requirements, hydraulic schematic, power and excitation electrical schematic, weigh system configuration data, weigh system test procedure
• Section 14 – Expanded Numerical Index: Parts sorted in numerical order

Across these 14 sections, the MT3700DC Parts Manual provides a complete part-by-part breakdown of the entire vehicle. Every assembly is presented with an exploded or isometric illustration, a bill of materials listing item numbers, quantities, part numbers, and descriptions, and clear references to related assemblies elsewhere in the manual. Where a component carries a service part drawing, the manual directs you to Section 12 for expanded detail including seal kits, repair kits, sub-components, and replacement parts.

What This Parts Manual Enables You to Do

• Identify every part on the MT3700DC truck by item number, part number, and description
• Confirm part numbers before ordering replacement components
• Cross-reference Caterpillar part numbers with Unit Rig / Bucyrus legacy numbers
• Understand how assemblies fit together through exploded and sectional illustrations
• Locate seal kits, repair kits, and service parts for individual components in Section 12
• Verify quantities of fasteners, washers, clamps, and fittings needed for a repair
• Follow electrical schematics and hydraulic schematics for diagnostics and troubleshooting
• Check serial number applicability to ensure the correct parts for MJ312-MJ322 trucks
• Reference lube requirements for chassis and front wheel bearings
• Service the auto lube system, central service points, and all major hydraulic circuits

Why This Manual Matters

Parts identification on a mining truck of this size is not a guess-and-check exercise. The MT3700B runs a Cummins K2000E engine rated at 2000 HP, GE 5GTA26F3 alternator, GE 5GE787FS11 wheel motors with 31.8:1 gear reduction, a 960-gallon fuel tank, 175-gallon hydraulic tank, 29×57 Rimex rims, and a 146/152 cubic yard dump body rated for a 717,000 lb maximum GVW and 205 short ton payload. Every one of those systems has a specific parts breakdown, and ordering the wrong component can mean costly downtime, incorrect fitment, or damage to adjacent assemblies.

This manual eliminates guesswork. It shows you exactly which parts belong where, gives you the part numbers to order, and provides the diagrams to understand how the pieces come apart and go back together. Whether you are maintaining a fleet of these trucks or keeping a single machine running, having the correct parts reference is essential.

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Instant PDF Delivery

This 2015 Caterpillar Unit Rig MT3700DC Parts Manual is delivered as an instant PDF download after purchase. There is no physical shipping, no waiting for a book to arrive, and no limitation on how many times you print pages for your workshop. Open it on any computer, tablet, or smartphone, and search or browse the section you need. If you work on MT3700B DC drive trucks in the MJ312-MJ322 serial range, this is the parts reference that covers them completely.