Komatsu 830E - Page 522

L10-10 Hydraulic Check-out Procedure 05/03 L10016
TROUBLESHOOTING CHART
(Flow Amplifier - Refer to Figure 10-5)
Trouble Possible Cause Suggested Corrective Action
Slow or hard steer
Stuck piston (position 2, Figure 10-
5).
Disassemble and check piston movement.
Heavy steering wheel
movement with a simul-
taneous opening of the
relief valve
Dirty throttle-check valve, (position
3) or dirty orifice screw (position 4).
Disassemble and clean the throttle check
valve and/or the orifice screw.
Free Wheeling (no end
stop)
Leaky shock valve or suction valve,
(position 6).
Setting pressure of shock valve too
low, (position 6).
Disassemble, clean and check shock and
suction valves.
Adjust the shock valve pressure setting.
Inability to Steer (No
Pressure Build-up)
Leaky relief valve in the priority
valve, (position 1).
Defective steering control unit.
Clean and perhaps replace the relief valve.
Replace the steering control unit.
Hard point when begin-
ning to turn the steering
wheel
Air in “LS” line.
Spring compression in the priority
valve too low.
Clogged orifice in the “LS” or “PP”
port (positions 7 & 8).
Bleed the “LS” line.
Replace priority valve spring.
Clean the orifice.