Slow Or Hard Steer; Free Wheeling (No End Stop); Inability To Steer (No Pressure Build-Up); Resistance When Initially Turning Steering Whee - Komatsu 930E-2 Shop Manual

POSSIBLE CAUSES
TROUBLE: Slow or hard steer
Stuck amplifier spool
Obstruction in orifice, directional spool
Incorrect relief valve pressure setting
TROUBLE: Free wheeling (no end stop)
Leaking shock and suction relief valve
Pressure setting of shock valve too low
TROUBLE: Inability to steer (no pressure build-up)
Defective steering control unit
TROUBLE: Resistance when initially turning steering wheel
Air in "LS" line
Priority valve spring compression weak
Obstruction in orifice in "LS" or "PP" port
L06021
(Flow Amplifier)
Disassemble valve, check amplifier spool for damage
or obstruction.
Disassemble valve, check directional spool and ori-
fices for damage or obstruction.
Check and correct relief valve setting.
Disassemble valve, check and clean shock and suc-
tion valves. Replace valves if necessary.
Adjust pressure settings.
Repair or replace steering control unit.
Bleed air from "LS" line.
Disassemble flow amplifier. Replace priority valve
spring.
Disassemble flow amplifier. Inspect and clean orifice.
Steering Circuit Component Repair
SUGGESTED CORRECTIVE ACTION
L6-27