Komatsu HD785-7 Parts Book LEPBH78703 – Serial J30001 and Up SAA12V140E-3 Engine

Description

Komatsu HD785-7 Parts Book — Serial J30001 and Up

This Komatsu HD785-7 Parts Book (document number LEPBH78703) covers the HD785-7 off-highway truck from serial number J30001 and up, equipped with the SAA12V140E-3 engine from engine number 505616 and up. It is the complete illustrated parts catalogue that Komatsu dealerships and service operations use to identify, order, and replace every component on the machine — from individual nuts, bolts, and O-rings through to complete assemblies such as the torque converter, transmission, rear axle, and body hoist cylinders.

When you are repairing or servicing an HD785-7, guessing a part number is not an option. This parts book eliminates that risk by giving you the exact part number, description, and quantity required for your machine’s serial number range, along with exploded diagrams that show how every component fits together. Whether you are rebuilding a cylinder head, replacing a hydraulic pump, ordering brake discs, or chasing down a wiring harness clip, the correct number is here.

File Details

• Manual type: Illustrated Parts Book / Parts Catalogue
• Brand: Komatsu
• Model: HD785-7
• Serial number coverage: J30001 and up
• Engine model: SAA12V140E-3
• Engine serial number coverage: 505616 and up
• Document number: LEPBH78703
• Language: English
• File format: PDF
• Page count: Approximately 674 pages

Chapters Covered

This parts book is organised into major sections that mirror the machine’s structure, with each section broken down into illustrated figures and corresponding parts lists.

Engine — SAA12V140E-3

• Cylinder Head (including valve guides, valve seats, springs, valves, crossheads, and head gaskets)
• Head Cover
• Air Intake Manifold, Air Intake Connection and Sensor
• Pre-Heater Switch
• Exhaust Manifold (with exhaust temperature sensor)
• Turbocharger and Lubricating Oil Piping
• Turbocharger Water Piping
• Turbocharger (KTR110L-F85PW) Inner Parts
• Heat Shield
• Exhaust Brake and Mounting, Exhaust Brake Inner Parts
• Front Cover, Gear Case and Front Cover Accessory
• Breather and Blowby Sensor Wiring
• Idler Gear, Camfollower Cover
• Oil Filler, Oil Pan Suction Tube, Oil Level Sensor, Oil Level Gauge
• Flywheel Housing (with bearing and revolution sensor), Flywheel
• Front Support and Rear Bracket
• Crankshaft, Damper, Piston, Crank Pulley
• Camshaft, Camfollower, Rocker Arm
• Oil Pump, Oil Filter, Oil Adapter, Oil Cooler
• Fuel Injection Pump Mounting, Common Rail (L.H and R.H)
• Fuel Supply Pump (L.H and R.H), Feed Pump
• Fuel Injection Piping (1/4 through 4/4)
• Fuel Supply Pump Lubricator, Fuel Injection Pump Drive
• Fuel Piping, Fuel Connection, Fuel Filter, Fuel Air Vent, Fuel Priming Pump
• Fuel Injection Nozzle and Spill Pipe, Fuel Return
• Fuel Injection Controller
• Water Pump, Water Pump Bypass Piping
• Air Water Piping and Water Outlet
• Cooling Fan (Suction Type), Fan Pulley and Drive Belt
• Cooling Fan Drive, Tension Pulley
• Corrosion Resistor
• Alternator Mounting (90A), Alternator (90A) Inner Parts
• Alternator Drive
• Starting Motor Mounting (7.5Kw and 11Kw), Starting Motor Inner Parts
• Electrical Wiring (Injector Harness Group, Pressure and Temperature Sensor Group, Main Harness Group)
• Cylinder Head Gasket Kit, Cylinder Block Gasket Kit, Water Pump Gasket Kit
• Pre-Lubrication Piping
• Name Plate and Caution (EPA 2nd Regulation, English)
• PM-Clinic Accessory
• Fuel Filter (1-5/8), Fuel Pre-Filter (1-1/4), Joint, Switch and Plate, Water Separator and Sensor (Poor Fuel Arrangement Spec)

Engine Related Parts

• Engine Cooling Tube, Engine Damper
• Engine Block to Cooling Plate, Cooling Plate to Water Separator (R.H and L.H)
• Fuel Piping, Filter to Engine (R.H and L.H)
• Block to Engine (R.H and L.H)
• Air Intake Piping
• Wiring Harness — Engine
• Heater Relay Wiring Harness
• Air Conditioner Related Parts (1/2 and 2/2)
• Vehicle Health Monitoring System (VHMS)
• Engine Mounting, Engine Mounting with Exhaust Bracket

Cooling System

• Radiator (1/2 and 2/2), Mounting Bracket, Baffle Plate
• Coolant Piping (1/3 through 3/3)
• Coolant Level Sensor
• Air Conditioner — Brake Cooler Piping
• Air Conditioner Related Parts
• Fan Net
• Coolant Piping (Without Engine Pre-Lubrication System) — Cooling Tube, Bypass Tube
• Coolant Piping (Radiator to Engine)

Fuel System

• Fuel Tank, Cover, Suction Valve, With Fuel Quick Charger Valve, Blind Plug
• Fuel Tank Mounting (1/2 and 2/2)
• Fuel Piping (Extra Bad Fuel and Poor Arrangement) — Tank to Block (1/2 and 2/2), Block, Hose, Mounting
• Fuel Piping (Extra Poor Fuel Arrangement) — Add Filter, Water Separator (1/2 and 2/2)
• Water Separator to Filter (L.H and R.H), Filter to Engine, Block to Engine R.H

Electrical System

• Battery Box and Rear Hood — Battery, Stay, Battery Box, Relay, Circuit Breaker, Large Capacity Fuel Arrangement Rear Hood, Under Hood, Cab Hood, Breather, Valve Box, Related Parts
• Wiring Harness (Extra Poor Fuel Arrangement) — Main Harness (1/2 and 2/2), Bracket and Clamp
• Electric Wiring Harness — Starting Motor Cable, Wiring Harness R.H, Wiring Harness L.H
• Rear Combination Lamp and Backup Alarm — Bracket, Lamp and Buzzer, Mounting
• Side Lamp (VHMS)
• Payload Meter Lamp (VHMS, Payload Meter) — R.H and L.H

Power Transmitting System

• Front Drive Shaft
• Rear Drive Shaft
• Torque Converter and Transmission — Bare, Input Shaft, Drive Case, Rear Housing, PTO Assembly, Mounting (1/3 through 3/3), Torque Converter Valve, Charger Pump Gear
• Transmission — 1st and 2nd Speed/Reverse Clutch, High Clutch, Low and 4th Speed Clutch
• Carrier (1/4 through 4/4)
• Case, Docking Unit, Input and Output Shaft
• Transmission Control Valve (1/2 and 2/2)
• Main Flow Selector Valve
• Oil Pan (1/2 and 2/2)
• Sensor
• Brake Cooling Pump — Inner Parts (1/2 and 2/2), Mounting
• Hydraulic Pump — Inner Parts (1/2 and 2/2), Mounting
• Steering and Hoist Pump — Inner Parts (1/3 through 3/3), Coupling (1/2 and 2/2), Mounting
• Suction Piping (1/2 and 2/2)
• Pre-Filter, Filter, Breather Piping
• Without Engine Brake System Pump Suction
• Pump to Brake Piping, Brake Control Valve to Filter
• Brake Piping, Nipple
• Torque and Transmission Mounting

Rear Axle

• Differential (1/3 through 3/3)
• Final Drive (L.H) (1/2 and 2/2), Final Brake (L.H) (1/4 through 4/4)
• Final Drive (R.H) (1/2 and 2/2), Final Brake (R.H) (1/4 through 4/4)
• Housing, Brake Piping (1/2 and 2/2), Blind Parts, Sensor
• Pin, Lubrication, Rod

Front Axle

• Suspension, Hydroneumatic — Hub R.H, Brake R.H (1/3 through 3/3), Cylinder R.H, Valve (1/2 and 2/2), Cover R.H, Sensor R.H
• Suspension Lubrication (1/2 and 2/2), Lever R.H
• Brake Piping (1/2 and 2/2), Brake Cooler Piping (1/2 and 2/2)
• Transport R.H, Hub L.H, Brake L.H (1/3 through 3/3), Cylinder L.H, Valve (2/2), Cover L.H, Sensor L.H
• Lever L.H, Transport L.H, Clip, Lubrication (1/2 and 2/2)

Hydraulic System

• Hydraulic Oil Tank — Tank (1/2 and 2/2), Hoist Valve Inner Parts (1/3 through 3/3), Hoist Valve Mounting, Hoist Piping, Demand Valve Inner Parts (1/3 through 3/3), Demand Valve Mounting, Transmission Oil Filter, Coolant Piping, Suction Piping, Transmission Piping (1/2 and 2/2), Block, Check Valve, Demand Valve to Filter Piping, Demand Valve to Steering Valve, Demand Valve Hoist Valve, Return Piping, Oil Filler Cap Lock and Cover, Emergency Steering Piping, Sensor, Steering and Hoist Piping, Cap, Quick Charge Related Parts (1/2 and 2/2), Dump Control, Mounting, Clip
• Brake Oil Cooling Control Valve — Inner Parts, Mounting, Bracket
• Transmission Piping — Transmission to Hydrostatic Tank Piping, Breather Piping (1/2 and 2/2)
• Steering and Hoist Hydraulic Piping — Cylinder L.H, Cylinder R.H (multiple configurations)
• Brake Oil Cooling Hydraulic Piping — Without Oil Quick Charger (1/2 and 2/2), Transmission to Front Brake (1/2 and 2/2), Oil Cooler to Rear Brake (1/2 and 2/2), Brake Oil Cooler to Return Filter, Brake Control Valve to Filter, Sensor
• Accumulator — Accumulator Cover (1/2 and 2/2), Accumulator R.H, Related Parts (1/2 and 2/2), Valve Related Parts, Hose, Accumulator L.H, Accumulator Mounting
• Brake Piping — Filter Piping, Frame L.H, Frame R.H (1/3 through 3/3), Brake Piping, Parking Brake Valve, Parking Hose, Tank, Tank Related Parts (1/2 and 2/2), Mounting, Proportional Valve Inner Parts, Rear Brake Piping, Front Brake Piping R.H, Front Brake Piping L.H, Proportional Valve Piping

Main Frame and Related Parts

• Main Frame — Extra Bad and Poor Fuel Arrangement (ASR), Frame, Mounting Bracket, Bracket, Axle Support
• Rear Support (Without Muffler)
• Front Support — Without Fog Lamp/Support and Head Lamp (L.H), VHMS Sensor, Mounting (1/2 and 2/2), Steep (1/2 and 2/2), Valve Cover, Steering Valve Related Parts, Steering Piping, Bracket (1/2 and 2/2), Support and Head Lamp (R.H), Bolt, Cab Mounting Parts (2/2), Step (1/2 and 2/2) Optional, Bracket Optional
• Stairway — Ladder and Step, Ladder Guard
• Engine Oil Filter — Extra Bad and Poor Fuel Arrangement Add Filter (L.H, Mounting, R.H)
• Positioner
• Air Intake Connector
• Exhaust Piping (Body Heating)
• Engine Control — Extra Poor Fuel Arrangement Add Filter (Mounting Parts, Switch)
• Transmission
• Steering Linkage — Lever and Rod, Mounting, Lubrication Piping
• Emergency Steering Control Switch — Motor, Motor Related Parts
• Lubrication Piping (Without Auto Greasing)

Operators Compartment and Control System

• Cab and Cab Floor Group — Cab Body, Door L.H, Door Lock L.H, Door Cover L.H, Door R.H, Door Lock R.H, Door Cover R.H, Door Related Parts, Glass Window, Antenna, Wiper, Seat, Accessory, Roof Pad, Mark and Plate, Window Washer Tank, Air Conditioner Filter, Related Parts, Accelerator Pedal, Accelerator Pedal Mounting, Brake Control Valve, Brake Hose, Brake Control Sensor
• Air Conditioner Inner Parts (1/2 and 2/2)
• Air Conditioner Piping
• Dashboard (1/2 and 2/2)
• Cab In Parts Air Duct
• Radio Cassette AM/FM, Radio
• Monitor Decal, Cap
• Monitor Panel
• Steering Column, Steering Wheel and Column
• Decal
• Operator’s Seat, Operator’s Seat Related Parts
• Dump Control (1/2 and 2/2, Inner Parts, Console Box)
• Cap Console Box
• Rear Cover (1/2 and 2/2)
• Auxiliary Seat
• Fuse Box and Relay, Relay
• Roll Over Angle Sensor Less
• Floor Control
• Emergency Steering Timer
• Payload Meter Angle Sensor
• VHMS
• ORBCOMM
• Parts for Less Pre-Lube
• Cab Wiring Harness and Under Cover
• Floor Material
• Cab Step — First Step, Side Step, Toe Guard, Side Mirror, Mounting, Antenna, Cap, Mudguard, Cab Under Cover, Ladder Inclined Type Front Step

Platform and Related Parts

• Platform Group — Platform L.H, Air Cleaner Inner Parts, Air Cleaner Related Parts, Platform Related Parts, Payload Meter Platform R.H, Mudguard, Handrail, Toe Guard R.H, Payload Meter Auto-Greasing Platform L.H and R.H, Auto-Greasing Pump
• Coolant Reservoir Tank — Oil Filler Cap and Cover Lock
• Under View Mirror, Side View Mirror (Additional Rear View Mirror R.H)

Guard and Cover

• Radiator Guard (Sandy and Dusty Terrain Arrangement)
• Engine Hood
• Fire Protection — Engine Rear Cover, Exhaust Cover, Cover, Steering Piping Protection
• Front Fender — Side Working Lamp L.H and R.H
• Engine Under Guard, Transmission Under Guard

Rim and Tire

• Rim — Front Wheel, Rear Wheel, Mounting Parts
• Tire — 27.00R49 E4 XDRACR Michelin, 27.00R49 E4 Bridgestone, 27.00R49 E4 GP Belshina, 27.00R49 E4 VMTS Bridgestone, 27.00R49 E4 Bridgestone
• Rear Suspension, Rear Suspension Pressure Sensor

Body

• Body — With Platform Guard, With 300mm Spill Guard (Auto Greasing System), With Side Extension 200mm, Light Body
• Body Accessory
• Rock Injector
• Body Hoist Cylinder — Inner Parts L.H (Option), L.H (1/2 and 2/2), Inner Parts R.H (Option), R.H (1/2 and 2/2), Inner Parts L.H, Related Parts (1/2 and 2/2), Inner Parts R.H, Related Parts (2/2)
• Body With 300mm Spill Guard, With Platform Guard
• Platform Guard (Without Muffler)
• Exhaust Box

Marks and Plates

• Name Plate Unit (1/2 and 2/2) — Indonesian and English, English Add Fuel Filter, Indonesian

Tool

• Spare Parts
• Cap and Overall
• General Tool Unit — Hose, General Tool Unit
• Tool Box Unit
• Payload Meter Software
• General Tool Kit

Miscellaneous

• Air Conditioner Related Parts — Hose Clamp, Heater Hose Clamp
• Cap Lock
• Fire Extinguisher — English, Indonesian
• Front Propeller Shaft Guard, Rear Propeller Shaft Guard
• ABS/ASR Chassis — Steering Sensor, Common Wiring Harness, Valve (1/2 and 2/2), Valve Wiring Harness
• Battery Isolator — Switch Box, Battery Cable, Cover and Guard
• Vehicle Health Monitoring System — Less, Clamp, Down Load, Antenna (With ORBCOMM)

Services Kit

• Service Kit (K01, K02)
• Service Kit (K03)
• Service Kit (K04, K09, K012)
• Service Kit (K013, K014)

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What This Parts Book Gives You

The HD785-7 is a 91-tonne class rigid haul truck used in mining and heavy construction. When one of these machines is down, every hour of downtime is expensive. This parts book exists to get it back into service as quickly as possible, by making sure the right part is identified the first time.

What sets this catalogue apart is the level of detail — it does not just list assemblies, it breaks them down to the component level. You get the exact part number, the quantity required, and the serial number range that each part applies to. That last point matters enormously on a machine like the HD785-7, where running changes were made during production. A part that fits a J30001 machine may not fit a later J30050 machine. This book removes the ambiguity.

The parts lists are paired with exploded illustrations that show how components relate to one another. This is invaluable when you are working on a system you have not touched before — a brake cooling circuit, a hoist valve, a torque converter PTO — because you can see the assembly order and identify which seals, rings, and fasteners go where.

Beyond the part numbers themselves, this catalogue gives you an accurate picture of the machine’s architecture. You can trace how the hydraulic system routes from the tank through the demand valve to the hoist valve and on to the cylinders. You can see how the fuel system is configured for the poor fuel arrangement specification, including the additional filters and water separators. You can identify which electrical harnesses and sensors serve which functions. For anyone maintaining a fleet of HD785-7 trucks, this is the reference document that answers the question: what part do I need, and where does it go?

Why You Need This Parts Book

Ordering the wrong part costs time and money. A wrong hydraulic hose, a seal that does not match the bore, a filter with the wrong thread — these are the delays that turn a two-hour job into a two-day wait for the correct component to arrive. The Komatsu HD785-7 Parts Book eliminates that risk. Every part number in this catalogue is specific to the HD785-7 serial number J30001 and up and the SAA12V140E-3 engine from engine number 505616 and up. It is the same information your Komatsu distributor uses when you place an order.

This parts book is also essential for planning. If you are scheduling a major service — a transmission overhaul, a brake rebuild, a hydraulic pump replacement — the illustrated parts breakdowns let you assemble a complete list of every gasket, seal, bearing, and fastener you will need before the machine is opened up. No more stopping mid-job because a $3 O-ring was not in stock.

For workshops that service multiple HD785-7 trucks, or for owners who maintain their own equipment, this manual pays for itself the first time it prevents a wrong order or helps you identify a discontinued part that has been superseded by a new number.

Instant PDF Delivery

This Komatsu HD785-7 Parts Book is delivered as an instant PDF download — no shipping, no waiting for a disc or a printed book to arrive. Once your payment is processed, you can download the file immediately and have it on your computer, tablet, or phone. The PDF is fully printable, so you can print just the sections you need for a particular job, or print the whole book for your workshop library. Whether you are working in the field on a tablet or at a desk with a printed copy, the information is there when you need it.