Komatsu 830E Shop Manual page 519

Trouble
Excessive free play at
steered wheels
Binding or poor center-
ing of steered wheels
Steering control valve
locks up
Steering wheel oscil-
lates or turns by itself
Steering wheels turn in
opposite direction
when operator turns
steering wheel
L10016 05/03
TROUBLESHOOTING CHART
(Steering Circuit)
Possible Cause
Broken or worn linkage between
cylinder and steered wheels.
Leaky cylinder seals.
Binding or misalignment in steering
column or splined column or splined
input connection.
High back pressure in tank can
cause slow return to center. Should
not exceed 300 psi (2068 kPa).
Large particles can cause binding
between the spool and sleeve.
Large particles in spool section.
Insufficient hydraulic power.
Severe wear and/or broken cardan
shaft pin.
Lines connected to wrong ports.
Parts assembled incorrectly.
Lines connected to wrong cylinder
ports.
Hydraulic Check-out Procedure
Suggested Corrective Action
Check for loose fitting bearings at anchor
points in steering linkage between cylinder
and steered wheels.
Replace cylinder seals.
Align column pilot and spline to steering
control valve.
Reduce restriction in the lines or circuit by
removing obstruction or pinched lines, etc.
Clean the steering control unit. If another
component has malfunctioned generating
contaminating materials, flush the entire
hydraulic system.
Clean the steering control unit.
Check hydraulic oil supply.
Replace pin or the steering control unit.
Check line routing and connections.
Reassemble correctly.
Correct cylinder port line connections.
L10-7