Komatsu WA250-3L Wheel Loader Service Manual
654 pages · Publication CEBM001301
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- Models
- WA250-3L
- Serial coverage
- A70001 and up
- Manual type
- Service Manual
- Pages
- 654
- Publication
- CEBM001301
- Condition
- Brand new
What's inside
From the manual's own table of contents: 2 sections, 131 entries. See sample pages (PDF, 794 KB)
General5 topics
- GENERAL
- STRUCTURE AND FUNCTION
- TESTING AND ADJUSTMENT
- DISASSEMBLY AND ASSEMBLY
- MAINTENANCE STANDARD
TROUBLESHOOTING102 topics
- Points to remember when troubleshooting
- Precautions when carrying out maintenance
- Precautions when handling electric equipment
- Points to remember when handling hydraulic equipment
- Checks before troubleshooting
- Judgement of power train
- Precautions when troubleshooting
- Preventing recurrence of trouble
- Method of using troubleshooting charts
- Connector types and mounting locations
- Electrical circuit diagram
- Machine monitor system
- T-MODE
- EAGLE AIR CONDITIONER
- Starting performance is poor (Staring always take time)
- (2) Engine turns but no exhaust gas comes out (Fuel is not being injected)
- (3) Exhaust gas comes out but engine does not start. (Fuel is being ejected)
- Engine stops during operations
- Engine does not rotate smoothly (hunting)
- Engine lacks output (no power)
- Oil becomes contaminated quickly
- Fuel consumption is excessive
- Oil is in cooling water, or water spurts back, or water level goes down
- T-3 Excessive shock when starting machine or shifting gear
- T-7 Steering is heavy
- T-9 Machine deviates naturally to one side when traveling
- BRAKE SYSTEM
- Brake is not released, brake drags
- WORK EQUIPMENT
- Boom does not rise
- When boom is raised, it moves slowly at a certain height
- Excessive hydraulic drift of boom
- Boom shakes during operation
- Boom drops momentarily when control lever is operated from HOLD to RAISE
- Bucket does not tilt back
- Bucket movement is slow or tilt-back lacks power
- Bucket movement becomes slow during tilt-back operation
- Bucket dumps momentarily when control lever is operated from HOLD to TILT
- Boom, bucket control levers are heavy or do not move smoothly
- Engine does not start (1/2)
- (a) Check starting circuit
- Engine does not start (2/2)
- (b) Check fuel shut-off solenoid
- Engine does not stop
- (transmission cut-off is normal)
- (d) Contact in directional circuit
- F is continuous
- R is continuous
- (Self -hold function of kick-down switch relay does not work)
- Kick-down is not canceled
- from FORWARD to neutral or REVERSE
- Kick-down switch is wrongly actuated when traveling in F2
- Preheating is not carried out
- Preheating remains actuated
- Table of action codes and failure codes
- Main monitor does not work
- Abnormality in shift indicator
- (b) Stays at N even when directional lever is at R
- and displays E when directional lever is at F
- and displays E when directional lever is at R
- (e) Does not display 1st, 4th
- Does not display 3rd, 4th
- Turn signal display does not light up
- (a) L.H. turn signal does not light up
- (b) R.H. turn signal does not light up
- Abnormality in parking display
- (a) Parking lamp does not light up
- (b) Parking lamp stays lit
- Abnormality in preheating system
- (a) Does not carry out preheating
- (1) Monitor display also does not light up
- (2) Only monitor display lights up
- (b) Only monitor display does not light up
- (c) Always carries out preheating for 1 minute
- (d) Preheating stays on
- (e) Preheating time becomes shorter, or is unstable
- Night lighting does not light up
- (a) Neither monitor display nor front working lamp light up
- (c) Monitor lights up but working lamp does not light up
- (a) Neither monitor display nor rear working lamp light up
- (b) Working lamp lights up but monitor display does not light up
- Abnormality in transmission cut-off
- cut-off function is not switched and display is not given
- (b) Monitor display goes out but cut-off function stays on
- light up for 3 seconds, maintenance monitor does not work
- (a) All lamps on maintenance monitor do not light up for 3 seconds
- (b) Some lamps do not light up
- but do not go out
- When staring switch is turned ON (engine stopped), CHECK items flash
- (a) Engine oil level display flashes
- (b) Engine water level display flashes
- (c) Brake oil level display flashes
- When starting switch is turned ON (engine started), CAUTION items flash
- (a) Engine oil pressure display flashes
- Does not light up
- (b) CAUTION lamp
- warning lamp (CHECK lamp, CAUTION lamp) lights up
- Night lighting lights up even when lamp switch is OFF, night lighting stays lit
- Service is running even when engine is stopped
- Abnormality in gauge items
- (a) Abnormality in fuel gauge
- (b) Abnormality in engine water temperature gauge
DISASSEMBLY AND ASSEMBLY22 topics
- ASSEMBLY
- FRONT AXLE
- REMOVAL
- INSTALLATION
- REAR AXLE
- DIFFERENTIAL
- AXLE HOUSING
- CENTER HINGE PIN
- STEERING VALVE
- DISASSEMBLY
- PRIORITY VALVE
- MAIN CONTROL VALVE
- STEERING CYLINDER
- POWER MASTER CYLINDER
- PARKING BRAKE DISC
- HYDRAULIC TANK
- HYDRAULIC FILTER
- BUCKET CYLINDER
- HYDRAULIC CYLINDER
- COUNTERWEIGHT
- FUEL TANK
- MAIN MONITOR
Inside this manual
Real pages from this service manual (654 pages). Open the sample pages (PDF, 792 KB)
- Diagram, page 79: STRUCTURE AND FUNCTION
- Troubleshooting, page 259: METHOD OF USING TROUBLESHOOTING CHARTS
- Specifications, page 519: REAR AXLE
- Foldout diagram, page 166
This is a service manual
Here's how it compares to the other manual types.
Service manual
Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.
Operator's manual
Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.
Parts manual
Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.
Engine service manuals are sometimes sold separately, since certain machine models were offered with more than one engine option.
What it's used for
Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.
Service shops and owner/operators who repair their own equipment
Identifying correct parts and seeing how assemblies come apart and go back together
Keeping equipment running with less downtime
Factory manual, 654 pages
Quantity one is the manual described above.
Fast free USA shipping
Ships in 1 business day.
60-day returns
Free if the mistake is ours. A manual ordered in error must come back unopened in its shrink-wrap; you pay return shipping and a 20% restocking fee applies. Return policy
Binder not included
Manuals over about 300 pages may need a standard 3-ring binder, which you can buy locally to keep the pages organized for shop use.
Questions about model, serial number, engine coverage or contents? Contact us before purchasing and we'll help confirm it's the right manual. Please verify the manual type, machine model, serial number range and engine coverage before purchasing: manuals ordered in error carry a 20% restocking fee (return policy).