Komatsu HM400-2 Articulated Dump Truck Shop Manual – PDF Download

Description

Komatsu HM400-2 Articulated Dump Truck Shop Manual

This comprehensive Komatsu HM400-2 Articulated Dump Truck Shop Manual provides the complete technical information required for servicing, repairing, and maintaining the HM400-2 articulated dump truck. Covering machines with serial numbers 2001 and up and A11001 and up, this manual is the definitive reference for professional technicians, fleet maintenance managers, and heavy equipment mechanics working on this 68,960 kg capacity hauler.

The HM400-2 Shop Manual spans every major system on the machine, from the Komatsu SAA6D140E-5 engine through the fully automatic TORQFLOW transmission, hydropneumatic suspension, wet-type multiple disc brakes, and the load-sensing hydraulic system. Whether you are performing routine maintenance, diagnosing a fault code, or rebuilding a component, this manual delivers the procedures, torque values, and judgement criteria you need.

File Details

• Manual Type: Shop Manual (comprehensive service and repair manual)
• Brand: Komatsu
• Model: HM400-2 Articulated Dump Truck
• Serial Numbers: 2001 and up, A11001 and up
• Language: English
• Page Count: Approximately 1,060 pages
• File Format: PDF
• Publication: Printed in U.S.A., Copyright 2005 Komatsu America Corp.
• Document Numbers: SEN00239-02, SEN00511-02 through SEN00534-01 (multi-volume shop manual set)

Chapters Covered

The HM400-2 Articulated Dump Truck Shop Manual is organized into the following major sections:

• 00 Index and Foreword — Safety notices, how to read the shop manual, explanation of terms for maintenance standards, handling electric equipment and hydraulic components, how to read electric wire codes, push-pull type coupler disassembly, standard tightening torque tables, conversion tables
• 01 Specification — Specification drawings, machine specifications, weight table, fuel, coolant and lubricants
• 10 Structure, Function and Maintenance Standard
  • Engine and Cooling System — Radiator, oil cooler, aftercooler, output shaft
  • Power Train System Part 1 — Power train skeleton, drive shaft, torque converter, transmission, transmission control valve, ECMV, main relief and torque converter relief valve
  • Power Train System Part 2 — Axle, differential, limited slip differential, final drive
  • Steering System — Steering column, steering valve
  • Brake System — Brake piping, brake valve, accumulator charge valve, accumulator, slack adjuster, brake, proportional reducing valve, brake system tank, parking brake, parking brake caliper, spring cylinder, parking brake solenoid
  • Undercarriage and Frame — Suspension, suspension cylinder, oscillation hitch
  • Hydraulic System — Steering and hoist oil pressure piping, dump body control, hydraulic tank and filter, flow amp valve, steering valve, steering cylinder, hoist valve, EPC valve, brake cooling oil control valve (BCV), pilot check valve, hoist cylinder, hydraulic pump
  • Cab and Its Attachments — Cab tilt, air conditioner
  • Electrical System Part 1 — Machine monitor system
  • Electrical System Part 2 — Automatic shift control system, transmission controller, auto emergency steering system, retarder control system, dump control lever
  • Electrical System Part 3 — Sensors and switches, KOMTRAX terminal system
• 20 Standard Value Table — Standard service value tables for engine and chassis
• 30 Testing and Adjusting
  • Part 1 — Engine speed measurement, intake air pressure, exhaust temperature, exhaust gas color, valve clearance, compression pressure, blow-by pressure, engine oil pressure, fuel system handling, fuel pressure, fuel return and leakage, air bleeding, fan belt tension, alternator belt tension, air conditioner compressor belt tension
  • Part 2 — Torque converter stall speed, power train oil pressure, differential lock oil pressure, transmission speed sensor adjustment, brake oil pressure, brake performance, brake circuit air bleeding, wheel brake disc wear, parking brake pad wear, emergency parking brake release, steering circuit oil pressure, suspension cylinder, cab tilting, dump circuit oil pressure, body positioner sensor, emergency escape at electrical system failure
  • Part 3 — Setting and adjusting various equipment, special functions of machine monitor, KOMTRAX terminal operation
• 40 Troubleshooting
  • General Information — Points to remember, sequence of events, check before troubleshooting, classification and procedures, connector pin numbers and connection table, T-boxes and T-adapters table
  • Troubleshooting by Failure Code, General — Failure codes table, before troubleshooting, information in troubleshooting table
  • Troubleshooting by Failure Code, Parts 1–8 — Detailed diagnostic procedures for every recorded failure code (1500L0 through DXH7KY), covering transmission clutch systems, pressure control valves, differential lock valves, engine controller codes, sensors, actuators, and communication faults
  • Troubleshooting for Electrical System (E-mode) — E-1 through E-16 covering engine starting, preheating, machine monitor, alarm buzzer, power mode, AISS, differential lock, seat belt, turn signals, night lighting, backup lamps, and emergency steering
  • Troubleshooting of Hydraulic and Mechanical System (H-mode) — H-1 through H-18 covering machine starting, travel smoothness, lockup, shift shock, gear shifting, travel speed, torque converter temperature, brake performance, steering, and dump body operation
  • Troubleshooting of Engine (S-mode) — S-1 through S-16 covering starting performance, engine stall, smooth rotation, power loss, exhaust gas color, oil consumption, fuel consumption, coolant contamination, oil pressure, overheating, abnormal noise, and vibration
• 90 Diagrams and Drawings — Hydraulic circuit diagrams (power train, steering and hoist, brake, brake cooling, differential lock), electrical circuit diagrams (inside cab 1–4, outside cab 1–3), connectors table and arrangement drawing

This shop manual gives the technician a complete picture of the HM400-2’s construction and operation. The structure and function sections explain not only how each component works but serve as reference material for troubleshooting. The maintenance standard sections provide the criteria and remedies for disassembly and service. The standard value tables give the judgement criteria for testing, adjusting, and troubleshooting. The testing and adjusting sections detail the measuring instruments and methods. The troubleshooting sections are divided by failure mode, with S-mode covering engine-related issues, E-mode covering electrical systems, and H-mode covering hydraulic and mechanical systems.

Why This Manual Matters for HM400-2 Owners and Technicians

The Komatsu HM400-2 is a 68,960 kg gross weight articulated dump truck powered by a Komatsu SAA6D140E-5 turbocharged and aftercooled diesel engine producing 338 kW (453 HP) at 2,000 rpm. With a maximum payload of 37,000 kg and a 16.5 m³ struck / 22.3 m³ heaped dump body, this machine is a production-critical asset. When it goes down, the cost per hour is substantial.

The HM400-2 Shop Manual enables you to:

• Perform complete engine service including valve clearance adjustment (intake 0.35 mm, exhaust 0.57 mm), compression pressure testing, blow-by pressure testing, and fuel system diagnostics on the common rail injection system
• Diagnose and repair the TORQFLOW transmission with its FL, FH, R, 1st, 2nd, and 3rd clutch packs, ECMV solenoid valves, and fill switches
• Service the torque converter with lockup clutch, including stall speed testing (1,832 ± 100 rpm), inlet/outlet pressure testing, and lockup clutch pressure testing
• Maintain the hydropneumatic suspension cylinders with correct nitrogen charge pressures (front: 4.31 MPa {44.0 kg/cm²}, rear: 1.18 MPa {12.0 kg/cm²}) and oil volumes
• Repair the wet-type multiple disc brakes on all six wheels, including slack adjuster service, brake disc wear testing, and parking brake pad adjustment
• Troubleshoot the load-sensing hydraulic system with flow amp valve, steering valve, hoist valve, and EPC valve
• Read and clear failure codes using the machine monitor service mode, including real-time monitoring, reduced cylinder mode, and no-injection cranking
• Perform emergency escape procedures when electrical system failures prevent machine operation
• Reference complete hydraulic and electrical circuit diagrams for tracing faults
• Apply correct tightening torques for standard bolts, split flange bolts, O-ring boss fittings, hoses, and engine-specific fasteners

Having the correct specifications and procedures on hand reduces the risk of collateral damage during repair, ensures components are tightened and adjusted to factory tolerances, and shortens diagnosis time when fault codes appear. The troubleshooting tables in this manual cross-reference failure codes, symptoms, possible causes, and standard values in the normal state, so you can work through problems methodically rather than by guesswork.

This Komatsu HM400-2 Articulated Dump Truck Shop Manual PDF is delivered instantly after payment. There is no shipping, no waiting for a physical book, and no risk of a damaged or incomplete paper copy. The PDF can be viewed on any device — laptop, tablet, or smartphone — and specific pages or sections can be printed for use in the workshop. Whether you are a Komatsu dealer technician, an independent heavy equipment mechanic, or a fleet owner maintaining your own HM400-2, this manual provides the depth of information needed to keep the machine running correctly.

For anyone responsible for the repair, maintenance, or overhaul of a Komatsu HM400-2 articulated dump truck, this shop manual is an essential reference that covers the machine from bumper to bumper — engine, transmission, axles, brakes, suspension, hydraulics, electrical, and body systems — with the precision that professional service work demands.

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