Komatsu WA250-1LC Manuals

Manuals and User Guides for Komatsu WA250-1LC. We have 1 Komatsu WA250-1LC manual available for free PDF download: Shop Manual

Komatsu WA250-1LC Shop Manual (648 pages)

WHEEL LOADER

Brand: Komatsu | Category: Compact Loader | Size: 61 MB

Table of Contents
5
Hoisting Instructions
10
Standard Tightening Torque
11
Coating Materials
12
Lubricants, Fuel and Coolant
15
Engine
19
Testing and Adjusting
19
Standardvaluetable Engine on Test Bench
21
Engineon Chassis
22
Tool List
22
Valveclearance
23
Fuelinjectiontiming
23
Engineoilpressure
24
Engineoiltemperature
25
Blow-Bypressure
26
Exhaustgas Color
27
Accelerator Pedal
28
Operatingangle
29
Disassembly and Assembly
32
Nozzleholderassembly
32
Removal
32
Installation
32
Cylinder Headassembly
33
Removal
33
Installation
34
Radiator
35
Removal
35
Installation
37
Engine
39
Removal
39
Installation
44
Fueltank
48
Removal
48
Disassembly and Assembly
49
Installation
49
Power Train
52
General
54
Hydraulic Circuit for Power Train
56
Hydraulic Circuit Diagram for Power Train
57
Torque Converter and Transmission Piping
58
Torque Converter Charging Pump
59
Specifications
59
Torqueconverter
60
Specifications
60
Outline
61
Torque Converter Oil Filter
62
Torque Converter Oil Cooler and Radiator
63
Structure and Function
64
Torqueflow Transmission
64
Clutchpack
66
Forwardandreverseclutch
66
Operationofclutch
68
Forward2Nd
70
Forward3Rd
71
Forward 4Th
72
Reverselst
73
Transmission Solenoid Valve
80
Quickreturnvalve
83
Emergencymanualspool
87
Directionalspool
89
Fillvalve
90
Pilotoilfilter
92
Driveshaft
93
Axle
94
Front
94
Rear
95
Differential
96
Front
96
Rear
97
Torque Proportioning
98
Finaldrive
100
Axle Mount
101
Tire and Wheel
103
Power Train
104
Testing and Adjusting
104
Testing and Adjusting
108
Shift Lever
111
Tireandwheel
114
Troubleshooting
115
Preventing Recurrence of Trouble
116
Method of Reading Troubleshooting Table
117
Transmission System
120
Checks before Troubleshooting
121
System
121
Troubleshootingtable
121
Torque Converter and Transmission
121
Machinedoesnotmoveoff
121
Machine Speed Is Low, Thrust Is Weak, Gradeability Falls off
123
Large Time Lag When Moving off or Changing Gear
126
Torque Converter Charging Pump
130
Removal
130
Installation
130
Removal
131
Torque Converter
131
Disassembly
145
Transmission
151
Disassembly
151
Forward-Reverse
154
Assembly
158
Clutch Pack
170
Disassembly
170
Forward-Reverseclutch Pack
170
2Nd-4Th Speed Clutch Pack
175
Assembly
177
Forward-Reverseclutch Pack
177
Lst3Rdspeedclutch PACK
182
Transmission Removal
190
Control Valve
190
Installation
191
Disassembly and Assembly
197
Drive Shaft Disassembly
198
Front Axle Removal
202
Rear Axle Removal
206
Axle Housing
229
Engine and Transmission Mount
241
Maintenance Standard
242
Torque Converter Charging Pump
242
Torque Converter
243
Transmission
250
Transmission Clutch
255
Lowervalve
255
Solenoidvalve
256
Axle
257
Differential
261
Finaldrive
263
Drive Shaft
264
Axle Mount
265
Steering System
267
Structure and Function
267
Steering Piping
268
Structure and Function
269
Hydraulic Circuit for Steering
269
Priorityvalve
269
Hydraulic Circuit Diagram for Steering
270
Two-Wayrestrictorvalve
271
Steeringvalve
272
Connection of Hand Pump and Sleeve
278
Steering Column
283
Steering Cylinder
284
Center Hinge Pin
285
Testing and Adjusting
287
Tool List
288
Steering Wheel Play
289
Operating Force of Steering Wheel
290
Operating Time of Steering Wheel
291
Steering Oilpressure
292
Testing and Adjusting
294
Troubleshooting Troubleshootingtable
296
Steering Wheel Does Not Turn
296
Steering Wheel Is Sluggish
297
Steering Wheel Moves Unsteadily or Is Subjected to Large Shock
298
Machine Tends to Turn Naturally in One Particular Direction When Traveling
298
Left and Right Turning Radii Are Different
298
Disassembly and Assembly
299
Removal
300
Installation
302
Disassembly
304
Assembly
306
Removal
308
Installation
313
Maintenance
329
Priority Valve
335
Structure and Function
338
Parking Brake Control
346
Parking Brake
347
Brake Caliper
349
Testing and Adjusting
350
Measuring Brakepedal
353
Brake Pedallinkage
354
Brakeperformance
356
Brake Piston Leakage
357
Air Bleeding from Brake Circuit
359
Parking Brake
361
Adjusting
362
Measuring Clearance
363
Troubleshooting
364
Troubleshooting Tables
365
Brake Is Ineffective or Not very Effective
365
Brake Cannot be Released or Drags
366
Disassembly and Assembly
368
Installation
370
Parking Brake
379
Installation
383
Maintenance
384
Work Equipment System
389
Hydraulic Circuit
391
Structure and Function
392
Hydraulic Circuit Diagram
392
Work Equipment Lever Linkage
393
Bucket Positioner and Boom Kick-Out
396
Hydraulictank
398
Hydraulic and Steering Pumps
400
Maincontrolvalve
401
Reliefvalve
403
Lift and Dump Spools at "Neutral Position
406
Lift Spool at "Raise Position
407
Lift Spool at "Lower Position
408
Operation
408
Lift Spool at "Float Position
409
Dump Spool at 'Tilt Back Position
410
Dump Spool at Dump "Position
411
Hydraulic Cylinder
412
Testing and Adjusting
413
Control Levers
417
Hydraulic Pressure
419
Liftarmand Bucket
421
Hydraulic Drift of Lift Arm and Bucket
422
Boom Kick-Out
424
Troubleshooting
426
Troubleshooting Troubleshootingtables
427
Lift Arm Movement Becomes Slow after It Reaches a Certain Height
429
Bucket Cannot be Held down with Lift Arm Cylinder
429
Lift Arm Movement Is Unsteady During Work
429
Lift Arm Descends Momentarily When Control Lever Is Shifted from "Hold" to "Raise
429
8. Bucket Does Not Tilt Back
430
Bucket Moves Slowly or Has Insufficient Tilt Back Power
431
10. Bucket Movement Becomes Slow During Tilt Back
432
Bucket Cannot be Held down by the Bucket Cylinder
432
12. Bucket Has Large Hydraulic Drift
432
Bucket Moves Unsteadily When Machine Travels under Load. (Main Control Valve in .Hold')
432
Disassembly and Assembly
435
Disassembly and Assembly
439
Hydraulic Filter
441
63-L 6
450
Lift Cylinder
457
Counterweight Removal
469
Maintenance Standard
472
Electric and Electronic System
484
Structure and Function
484
Electrical Wiring Circuit Diagrams
485
Combination Switch
489
Neutralizer Relay
491
Electronic Vehicle Monitoring System (Evms)
493
Monitorpanel
494
Structure and Function
495
Indication on Monitor Panel
495
Engine Oil Level Sensor
499
Coolantlevelsensor
499
Brakeoillevelsensor
500
Fuel Gauge Sensor
501
Torque Converter Oil Temperature Sensor
502
Engineoilpressuresensor
503
Rotationalspeedsensor
503
Proximityswitch
504
82 Testing and Adjusting
508
Adjusting Speedometer Module
511
Troubleshooting
512
Troubleshooting Electricalcircuitsystem
514
Engine Starting Circuit System
514
Engine Stop Circuit System
515
Pin Number
517
Connection Table for Connector Pin Number
518
MIC Connector
518
Precaution When Handling Connector
522
Method of Using Yes-No Troubleshooting Flow Chart
524
Position of Connector
526
Electrical Schematic
527
Troubleshooting Charts for Electric System
530
Position of Connectors
531
E-L ENGINE DOES NOT START
536
Engine Does Not Stop
537
Engine Stops When Machine Is Traveling
537
Troubleshooting
537
Machine Moves in Reverse but Not in Forward
538
Machine Moves Neither in Forward nor Reverse
539
Machine Moves in Forward but Not in Reverse
541
Machine Moves Forward Even When Transmission Control Levers Are in Neutral
541
Machine Moves in Reverse Even When Transmission Control Levers Are in
542
Machine Always Travels in 2Nd
542
Troubleshooting Charts for Electronic Vehicle Monitoring System
548
Electronic Vehicle Monitoring System (Evms) Schematic
549
Position of Connectors
551
Even When Engine Is Stopped, (Brake Oil Level) Flashes
556
Even When Engine Is Stopped, (Engine Oil Level) Flashes
556
Even When Engine Is Stopped, (Coolant Level) Flashes
557
Battery Charge) Flashes When Engine Is Running
557
Troubleshoot,Ng
557
Fuel Level) Flashes
558
When Engine Is Running, Even Though There Is no Abnormality in Machine
558
(Brake Oil Level) Flashes
558
(Engine Oil Pressure) Flashes
558
(Coolant Level) Flashes
559
Troubleshooting
559
When Engine Is Running, Even Though There Is no Abnormality in Machine
560
(Brake Servo Pressure) Flashes (if Equipped)
560
Parking Brake) Lights up or Does Not Light up
560
Not Used
562
Failure in Main Steering) Lights up or Does Not Light up (if Equipped)
562
Turn Signal Lamps, High Beam Light up or Do Not Light up
565
Troubleshootang
566
All or Part of Monitor Panel Does Not Work
569
Lamps on Monitor Light up (Immediately after Turning Starting Switch to On, Engine Stopped)
570
Central Warning Lamp Does Not Go out
571
Central Warning Buzzer Does Not Stop
571
None of Panel Lamps on Machine Monitor Light up
572
Some of Panel Lamps on Machine Monitor Do Not Light up
574
Abnormality in (Fuel Gauge)
576
Abnormality in (Torque Converter Oil Temperature Gauge)
576
Table of Monitor Reference Values
579
Disassembly and Assembly
584
Others
589
Structure and Function
589
Air Conditioner
592
Electrical Diagram
594
Disassembly and Assembly
599
Principle of Operation
612
General Description
614
Structure and Operation
615
Maintenance Standard
633
Metric Conversions
635

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Komatsu WA250-1LC Shop Manual (648 pages)

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