H-6 The Steering Wheel Does Not Turn - Komatsu WA250-6 Shop Manual

500 Troubleshooting of hydraulic and mechanical system (H-mode)

H-6 The steering wheel does not turn

H-6 The steering wheel does not turn
Ask the operator about the following:
Did the problem suddenly start?
q
o
Breakage of steering related equipment
Was there previously any symptom, such as heavy steering?
q
o Internal wear of steering related equipment, defective seal
Inspection before diagnosis
Are the oil level in the hydraulic tank and the oil type appropriate?
q
Has the lock bar been removed from frame?
q
No.
Diagnosis
1 Steering wheel does not turn in both directions (left and right)
2 In condition in Item 1, movement of work equipment is abnormal
3 In condition in Item 1, movement of work equipment is normal
4 Steering wheel turns only in one direction (left or right)
5 Steering wheel is heavy and does not turn
6 Oil pressure of steering circuit is low or there is no pressure
7 Emergency steering does not function in both directions (left and right)
a There is a close connection between the steering circuit and work equipment circuit, so if any abnormal-
ity is felt in the steering, check the operation of the work equipment also.
a If the steering pump is abnormal (broken), check the priority valve at the same time.
*1. This warning is given only when the emergency steering is installed.
WA250, 250PZ-6
Cause
Hydraulic
pump
a b
E
Remedy
X X
Q Q
Q
Q
Q Q
SEN03849-00
1
Others
c d e f
E E E
X X X X X
Q Q Q Q
Q Q Q
Q Q
Q
Q
13
40-500