Komatsu HD785-5 Dump Truck Product Knowledge Training Handbook – PDF

Description

Komatsu HD785-5 Product Knowledge Training Handbook – Complete System Training for the HD785-5 and HD985-5 Dump Trucks

The Komatsu HD785-5 Product Knowledge Training Handbook is a full system-by-system training reference for the HD785-5 and HD985-5 rigid frame dump trucks, prepared by the Plant Training Center at PT. Bukit Makmur Mandiri Utama (BUMA), Cileungsi, and compiled directly from the Komatsu HD785-5 Shop Manual. Across 351 pages it takes a mechanic through every major system on the truck – the Komatsu SA12V140 engine and its electronic governor, the torque converter and TORQFLOW transmission, the air-over-hydraulic brake package, steering, hoist, suspension, machine monitor, payload meter II, PMC and ABS/ASR – explaining what each component is called, where it sits on the machine, what it does, and exactly how it works.

This is a teaching document rather than a bare specification sheet. Every system is opened up with sectioned drawings, hydraulic circuit diagrams, air circuit diagrams, electrical wiring layouts, pressure charts and set-pressure values, so the reader builds a mental model of how the truck behaves before ever touching a wrench. It was written to support a 40-hour, five-day product training programme (90% classroom discussion, 10% practice), but it stands on its own as a self-learning reference for any mechanic working on the HD785-5 or HD985-5.

File Details

• Manual type: Product knowledge training handbook (self-learning and instructor reference)
• Equipment covered: Komatsu HD785-5 and HD985-5 dump trucks
• Serial number coverage: HD785-5 serial number 4001 and up; HD985-5 serial number 1021 and up
• Engine covered: Komatsu SA12V140
• Language: Technical text with English section headings and component terminology
• Page count: 351 pages
• File format: PDF
• Prepared by: Plant Training Center – Cileungsi, Plant People Development (PT. Bukit Makmur Mandiri Utama)
• Dated: 29 March 2010
• Basis: Compiled from the Komatsu HD785-5 Shop Manual

Chapters Covered

• Training profile – prerequisites, duration, training outcome, pass criteria, recommended follow-on training
• Safety – important safety notice, general precautions, preparations for work
• How to read the shop manual – chassis, engine, electrical and attachment volumes, filing method, revised edition marks, symbols
• Hoisting instructions – heavy part handling, wire rope selection and allowable load tables
• Explanation of terms for maintenance standard – standard size and tolerance, standard clearance and standard value, repair limit and allowable value, standard interference, clearance limit, interference limit
• Handling electric equipment – wiring harnesses and connectors, main failure modes, connector removal and installation, drying wiring harnesses, controller handling, electric circuit troubleshooting
• Handling hydraulic equipment – operating environment, sealing openings, refilling, flushing and cleaning operations
• Coating materials – adhesives, gasket sealants, molybdenum lubricants, greases, primers, glass adhesives and caulking materials
• Standard tightening torque tables – metric bolts and nuts, flared nuts, split flange bolts, O-ring boss piping joints and plugs, taper seal and face seal hose connections
• Electric wire code – classification by thickness and classification by colour and code
• Method of disassembling and connecting push-pull type couplers
• Specifications – weight, weight distribution, performance, dump body capacity, dimensions, engine, power train, steering, suspension, brake system and hydraulic system data for HD785-5 and HD985-5
• Travel performance and brake performance graphs
• Weight table for lifting and mobilisation
• List of lubricant and water – ambient temperature ranges, specified and refill capacities
• Radiator – structure, pressure relief valve, vacuum valve, radiator cap, altitude and boiling point relationship
• Torque converter and transmission – main relief valve, torque converter relief valve, lockup valve, solenoid valve, transmission valve, ECMV structure and actuation, transmission lubrication valve
• Differential, differential lock system, differential lock solenoid valve, final drive
• Brake system – front brake, rear brake, parking brake, slack adjuster, brake line failure sensor, air governor, safety valve, check valve, double check valve, auto drain valve
• Brake control valves – hand brake valve, brake valve, emergency brake valve, emergency relay valve, parking brake relay valve, quick release valve, parking brake chamber, ratio valve, brake chamber
• Switches – stop lamp switch, exhaust brake switch, inclination switch, front brake cut-off valve
• Steering system – steering column, steering valve, demand valve, crossover relief valve, steering cylinder
• Hoist system – hoist control, body positioner, hoist valve, hoist cylinder, hoist circuit operation
• Suspension system – front suspension cylinder, rear suspension cylinder, variable damping mechanism, automatic suspension system
• Air conditioner – heating, cooling, refrigerant circuit, receiver dryer, condenser, compressor
• Engine control system – fuel injection pump electronic governor, AISS (Automatic Idling Setting System), engine controller, exhaust brake
• Automatic shift control system – transmission controller, shift lever positions and automatic gear shifting ranges, automatic gear shifting line graph, gearshifting time lag, safety functions
• Sensors and switches – engine speed sensor, transmission speed sensor, engine oil pressure, engine water temperature, retarder oil temperature, torque converter oil temperature, air pressure, fuel level, transmission oil filter, radiator water level, steering oil temperature, brake stroke, accelerator sensor, shift lever, shift limiter, mode selector
• Automatic emergency steering system – flow switch, relay timer, emergency steering valve
• Payload meter II – block diagram, calibration, measuring payload, compensating on slopes, service check mode, pressure sensor, clinometer, lamp drive relay, self-diagnostic function
• Machine monitor system – system drawing, machine monitor diagram, normal display functions, self-diagnostic function at starting switch operation, travel speed compensation rotary switch
• PMC system – power train management controller
• ABS / ASR system – system circuit diagram, operation logic, ABS / ASR controller, ABS pressure control valve, ASR control valve, wheel speed sensor, ASR II system
• Standard value table for engine related parts
• Standard value table for chassis
• Standard value table for electrical parts
• Tools for testing, adjusting and troubleshooting
• Adjusting valve clearance
• Testing and adjusting fuel injection timing
• Adjusting engine speed sensor and transmission speed sensor
• Adjusting electronic monitor
• Adjusting Q (fuel injection amount) when replacing engine controller
• Setting rotary switch (model data, network data) when replacing transmission controller
• Method of deleting data from engine controller, transmission controller and PMC memory
• Method for emergency escape when there is failure in the electrical system
• Procedure for operating modulating checker
• Explanation of functions (control mechanism) of the electrical system
• Monitor panel user codes and service mode function
• Maintenance standard – output shaft, torque converter valve, torque converter, transmission, ECMV, front axle, rear axle support, differential, final drive, front brake, rear brake, parking brake, steering linkage, front suspension cylinder, rear suspension cylinder, parking brake chamber, slack adjuster, hydraulic pumps, demand valve, crossover relief valve, hoist valve, steering cylinder and hoist cylinder

Read end to end, the handbook builds from the basics outward. It opens with the maintenance vocabulary every measurement depends on – standard size, tolerance, clearance limit, interference limit, repair limit and allowable value – then moves through working safely, handling harnesses, connectors and controllers without destroying them, and handling hydraulic components without letting contamination into the circuit. Only after that groundwork does it dive into the machine itself: the SA12V140 engine and its electronically governed fuel injection pump, the torque converter with its lockup clutch, the seven-speed TORQFLOW planetary transmission and the ECMV valves that fill and regulate each clutch, the differential and final drive, the air-over-hydraulic brake package front and rear, the load-sensing demand valve that splits steering and hoist flow, the hoist valve’s four operating positions, the hydropneumatic suspension cylinders and their variable damping, and finally the electronic layer – engine controller, transmission controller, suspension controller, PMC, machine monitor panel, payload meter II and the ABS/ASR package – complete with user codes, service codes and service mode procedures for pulling stored fault data back out of memory.

Reference Data, Torque Values and Adjustment Standards

For day-to-day work in the shop, the handbook carries the numbers a mechanic actually reaches for. Standard tightening torque tables cover metric bolts and nuts by thread diameter and width across flats, flared nuts, split flange bolts, O-ring boss piping joints and O-ring boss plugs, plus taper seal and face seal hose connections. Electrical work is supported by wire code tables that decode nominal number, strand count, cross section, cable outside diameter, current rating and colour code – so a harness tag like 5WB can be read straight off the page.

Set pressures and adjustment values appear with the components they belong to: main relief valve actuating pressure, torque converter relief valve pressure, lockup valve set pressure, transmission lubrication valve cracking pressure, hoist circuit relief pressure, crossover relief pressure, brake cooling control valve pilot relief values, air governor cut-out and cut-in pressures, safety valve release pressure, and radiator pressure relief differential. The adjustment section then walks through valve clearance setting with the firing order, fuel injection timing by both the counter mark alignment method and the delivery valve method, engine and transmission speed sensor clearance, electronic monitor compensation, controller Q adjustment and rotary switch settings after controller replacement.

Diagnostics, Controllers and Service Modes

The electronic side of the HD785-5 gets the same treatment as the mechanical side. Machine monitor system coverage includes the full monitor panel layout, the normal display functions for gauges, pilot lamps and cautions, and the self-diagnostic sequence that runs when the starting switch is turned on. From there the handbook explains user code display, how to call up the stored service codes behind a user code, and how to move through machine data monitoring mode and service code / trouble data display mode to read live input and output values for every controller on the network.

Controller-specific chapters cover the engine controller with its self-diagnostic display window and connector layout, the transmission controller with its connector pin tables for ATC1 through ATC5B, the suspension controller, the power train management controller, and the ABS/ASR controller. Memory deletion procedures, emergency escape methods when the electrical system fails, and the modulating checker procedure for measuring clutch pressure, checking manual shift, manually operating lockup and measuring torque converter stall speed are all documented step by step.

Who This Handbook Is Written For

This handbook suits mechanics responsible for the HD785-5 and HD985-5 who need to move past parts swapping and understand why a system behaves the way it does. It suits trainers who need ready-made system explanations, diagrams and discussion material for product training sessions. It suits maintenance planners and supervisors who want a single reference that ties component location, function, operation, testing and adjusting together for the whole truck. And it suits anyone preparing for the follow-on preventive maintenance, machine troubleshooting and overhauling training that this course is designed to feed into.

Put the Full HD785-5 System Picture in Your Hands

With this handbook on hand you can identify a component by name and location, explain how it works, carry out the simple testing and adjusting procedures the training programme expects, and approach basic troubleshooting with a structured understanding instead of guesswork. Correct procedures and correct specifications are what keep a 91,000 kg rated load truck productive – wrong torque values, wrong set pressures or contaminated hydraulic circuits are what turn a small fault into a major failure and a long downtime.

IMAGES PREVIEW

The Komatsu HD785-5 Product Knowledge Training Handbook is delivered as an instant PDF download. There is no shipping, no waiting and no physical book to lose in the workshop. Open it on a laptop, tablet or phone at the machine, print the pages you need for the job, and keep the rest of the 351-page reference within reach. Order now and start working on the HD785-5 with the same material the training centre uses.