Failure Code And Cause Table - Komatsu WA250-6 Shop Manual

SEN03849-00

Failure code and cause table

Failure Code
Does not travel forward or in reverse
Does not travel forward (reverse is normal)
The machine does not start at reverse (Forward is normal)
Speed is slow in both forward and reverse
The travel speed is slow at forward (Reverse is normal)
The travel speed is slow at reverse (Forward is normal)
The traction force is weak in both forward and reverse
The traction force is weak at forward (Reverse is normal)
The traction force is weak at reverse (Forward is normal)
Engine stalls when traveling or engine speed drops excessively
The gear is not shifted
The steering wheel does not turn
The steering wheel is heavy
There is play in steering wheel or excessive shock
Machine deviates naturally to one side when traveling
The brake does not work or does not work well
The brake is not released or is dragged
The lift arm does not rise or lower
The lift arm moves slowly or the lift arm rising force is insufficient
When the lift arm is rising, the lift arm comes to move slowly at
specific height
The lift arm cylinder cannot be hold down the bucket
(The bucket rises in the air)
Hydraulic drift of the lift arm occurs often
The lift arm wobbles during operation
When the control lever is switched from "HOLD" to "RAISE", the lift
arm falls temporarily
The bucket does not tilt back
The bucket moves slowly or the tilting-back force is insufficient
The bucket comes to operate slowly in the midst of tilting-back
The bucket cylinder cannot be hold down to bucket
Hydraulic drift of the bucket occurs often
The bucket wobbles during travel with load
(The work equipment valve is set to "HOLD")
When the control lever is switched from "HOLD" to "TILT", the bucket
falls temporarily
The control levers of the lift arm and bucket do not move smoothly
and heavy
ECSS does not operate but pitches and bounces
ECSS does not move at all
Fan revolution is abnormal (Fan sound/vibration is abnormally large
or engine overheats)
Fan always revolves in reverse
6
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Part causing problem
Q Q
Q
Failure code and cause table
HST pump
motor 2
Q Q Q Q Q Q
Q Q
Q Q
Q Q Q Q
Q Q
Q Q
Q Q
Q
Q
Q
Q Q
Q
Q Q
Q
1
HST HST
motor 1
Q Q Q
Q Q Q Q Q Q
Q Q Q Q
Q Q
Q Q
WA250, 250PZ-6