Komatsu WA320-6 WA320PZ-6 Wheel Loader Shop Manual SEN03911-02 PDF

Description

Komatsu WA320-6 WA320PZ-6 Wheel Loader Shop Manual (SEN03911-02)

The Komatsu WA320-6 WA320PZ-6 Wheel Loader Shop Manual is the full workshop documentation set for these two KA-spec wheel loaders, issued under form number SEN03911-02 and dated 06-09 (01). It bundles every technical volume Komatsu publishes for the machine into one indexed manual: specification and technical data, structure and function of each system, standard service values, testing and adjusting procedures, complete failure-code troubleshooting, and step-by-step disassembly and assembly for every major component. Coverage starts at serial number 70001 and up for both the WA320-6 and WA320PZ-6.

Both machines run the Komatsu SAA6D107E-1 diesel engine, and the manual documents the HST-driven drivetrain, articulated steering, wet multiple-disc brakes, ECSS, and machine-monitor electrical architecture in the same level of detail Komatsu technicians use in the field. Nothing is left as a summary — the testing section alone runs through three volumes of procedures, and the troubleshooting chapter is split into failure-code parts, electrical (E-mode), hydraulic and mechanical (H-mode), and engine (S-mode) references.

File Details

• Manual type: Komatsu Shop Manual (full workshop set)
• Brand: Komatsu
• Models covered: WA320-6, WA320PZ-6 (KA SPEC.)
• Serial numbers: 70001 and up (both models)
• Engine: Komatsu SAA6D107E-1
• Language: English
• File format: PDF
• Document number: SEN03911-02
• Publication date: 06-09 (01)
• Page count: 1,300+ pages

Chapters Covered

• 00 Index and Foreword — manual composition, safety notice, how to read the shop manual, maintenance standard terminology, handling of electrical and hydraulic components, engine connector handling, electric wire code, standard tightening torque tables, conversion tables
• 01 Specification — specification dimension drawing, specifications, weight table, table of fuel, coolant and lubricants
• 10 Structure, Function and Maintenance Standard
  • 100 Engine and Cooling System — engine mount, damper, cooling system, cooling fan motor
  • 200 Power Train — power train system diagram, drive shaft, HST piping, HST pump, HST motor, transfer, clutch solenoid valve, axle, differential, torque proportioning differential, limited slip differential, final drive
  • 300 Steering System — piping diagram, steering column, priority valve, orbit-roll valve, cushion valve, steering cylinder, emergency steering valve and relief valve
  • 400 Brake System — piping diagram, charge valve, brake valve, inching valve, accumulator, slack adjuster, brake, parking brake control and parking brake
  • 500 Undercarriage and Frame — axle mount and center hinge pin, tires
  • 600 Hydraulic System — work equipment hydraulic piping, control lever linkage, hydraulic tank, 4-gear pump, work equipment control valve, cut-off valve, PPC valve, lock valve, accumulators, ECSS valve
  • 700 Work Equipment — linkage, bucket, bucket positioner and boom kick-out, work equipment cylinder
  • 800 Cab and Attachments — cab, air conditioner
  • 910 Electrical System, Part 1 — machine monitor system, machine monitor
  • 920 Electrical System, Part 2 — HST controller system, HST controller, ECSS, KOMTRAX, engine starting and stopping circuits, preheating, output derating, automatic warm-up, parking brake circuit, coupler plunger control, multi-function knob, max traction switch, sensors
• 20 Standard Value Table — standard service value table for engine and chassis
• 30 Testing and Adjusting
  • 110 Part 1 — tools, engine speed, exhaust gas color, valve clearance, compression pressure, blow-by pressure, engine oil pressure, intake air (boost) pressure, fuel system handling, fuel pressure and return rate, bleeding, leak checks, controller voltage, muffler checks, air conditioner and alternator belts
  • 120 Part 2 — accelerator pedal, directional lever, HST oil pressure, clutch control pressure, steering wheel and steering oil pressure, hydraulic fan, brake pedal and linkage, brake performance, accumulator charge pressure, wheel brake oil pressure, brake disc wear, parking brake, work equipment lever and hydraulic pressure, PPC oil pressure, bucket positioner, boom kick-out switch, proximity switch pilot lamp, diode testing, KOMTRAX terminal operations
  • 130 Part 3 — machine monitor adjustment, special functions (EMMS), Pm clinic inspection chart
• 40 Troubleshooting
  • 100 Failure code table and fuse locations
  • 200 General troubleshooting information, connector pin tables, T-branch box and adapter tables
  • 310–370 Troubleshooting by failure code (Parts 1 through 7)
  • 400 Electrical system troubleshooting (E-mode)
  • 500 Hydraulic and mechanical system troubleshooting (H-mode)
  • 600 Engine troubleshooting (S-mode)
• 50 Disassembly and Assembly
  • 100 General information, special tool list, coating materials list
  • 200 Engine and Cooling System — fuel supply pump, fuel injector, cylinder head, engine hood, radiator, air aftercooler, hydraulic oil cooler, engine assembly, front and rear oil seals, cooling fan and fan motor, fuel tank
  • 310 Power Train Part 1 — transfer, parking brake
  • 320 Power Train Part 2 — front and rear axle, axle housing, differential
  • 400 Undercarriage and Frame — center hinge pin, counterweight
  • 500 Hydraulic System — HST pump and 4-gear pump, HST motor 1 and 2, work equipment control valve, hydraulic tank, hydraulic cylinders
  • 600 Work Equipment — work equipment assembly
  • 700 Cab and Attachments — operator’s cab and floor frame, cab glass, seat, air conditioner unit
  • 800 Electrical System — monitor panel, engine controller, HST controller, KOMTRAX terminal
• 90 Diagrams and Drawings — automatic greasing circuit diagram, hydraulic circuit diagram, electrical circuit diagram, connector list and stereogram

What this shop manual really delivers is the complete service workflow Komatsu laid out for these machines. A technician can look up a machine specification in the 01 chapter, find how that system is built in the 10 chapter, check the wear limits in the 20 chapter, run the measurement procedure in the 30 chapter, diagnose a displayed failure code in the 40 chapter, and then follow the factory disassembly and assembly sequence in the 50 chapter — with a hydraulic and electrical diagram pulled from the 90 chapter whenever a circuit needs to be traced. The failure-code troubleshooting volumes cover both the machine monitor system and the engine controller, with every code listed, its trigger condition described, the system’s protective response noted, and the possible causes broken down with the standard resistance, voltage, and pressure values needed to isolate the actual fault.

Systems and procedures this manual supports

The coverage runs across every major system on the WA320-6 and WA320PZ-6. On the power train side, the HST pump, both HST motors, transfer, clutch solenoid valve, axle, standard differential, torque proportioning differential, limited slip differential, and final drive are each documented. The steering chapter covers the priority valve, orbit-roll valve, cushion valve, steering cylinders, and the emergency steering option. The brake chapter covers the charge valve, brake valve, inching valve, accumulators, slack adjuster, wheel brakes, and the mechanical parking brake. The hydraulic section documents the 4-gear pump, work equipment control valve, cut-off valve, PPC valve, lock valve, PPC and ECSS accumulators, and the ECSS valve. The electrical volumes cover the machine monitor, HST controller, ECSS, KOMTRAX, starting and stopping circuits, preheating, derating, warm-up, parking brake circuit, and the full sensor set.

Testing and adjusting values are given as standard new-machine values with service limit values and measurement conditions for engine speed, blow-by, oil pressure, HST high-pressure cut-off and low-pressure relief, servo piston control and actuation pressures, transfer clutch control pressure, steering relief pressure, brake performance, accumulator charge pressure, wheel brake oil pressure, work equipment relief pressure, PPC oil pressure, hydraulic drift, fan speed, and proximity switch clearances. The standard value table also lists operating effort and travel for the directional lever, speed switch, work equipment control lever, steering wheel, accelerator, and brake pedal.

Why this manual matters in the workshop

Wheel loaders in this class live on HST components, hydraulic circuits, and electrical networks that interact — a code on the monitor can be an electrical fault, a hydraulic fault, or a mechanical fault, and the wrong diagnosis costs time and parts. This shop manual gives the technician the measurement procedures, torque values, clearance limits, and system diagrams needed to make that call correctly, and the disassembly and assembly chapter shows the exact order, special tools, coating materials, and tightening torques required to put the machine back together without damaging seals, bearings, or machined surfaces. The safety notice, torque tables, and connector handling instructions at the front are the same references used before any work begins.

How you receive the manual

IMAGES PREVIEW

The Komatsu WA320-6 WA320PZ-6 shop manual is delivered as an instant PDF download — no shipping, no waiting, no physical binder to store. Open it on any laptop, tablet, or phone in the workshop, print the pages you need for the job at hand, and keep the digital copy on file for the next service. Because the document is organised by form number and section, you can jump straight to the chapter that matches the work order, whether that is a routine valve clearance adjustment or a full HST motor rebuild.