H-1 The Machine Does Not Start - Komatsu WA250-6 Shop Manual

SEN03849-00

H-1 The machine does not start

Ask the operator about the following:
Has the machine come not start suddenly?
q
o
Breakage of HST pump and motor related
equipment
Was there any problem of not traveling before?
q
o Internal wear of HST pump and motor related
equipment, defective seal
Inspection before diagnosis
Are the oil level in the hydraulic tank and the oil type
q
appropriate?
Is inching valve linkage properly adjusted?
q
Is the any external oil leak found around the hydraulic
q
piping, pump and motor?
No.
Diagnosis
Does not travel forward or in reverse
1
Does not travel forward (reverse is normal)
2
3 Does not start at reverse (Forward is normal)
Does not travel forward or in reverse, motor makes sound of
4
rotation
8
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
a b c d e
E E E
Remedy
X X X
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H-1 The machine does not start
Cause
f g h i j
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Q Q Q Q Q Q Q Q Q Q Q
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WA250, 250PZ-6
1
k l m n o
E E E E E
X X X X X
A
Q Q Q