70
5.2.5
Full hydraulic steering gears
Troubles & possible causes
Fixing methods
1.
Steering operation is heavy
Insufficient oil delivery of
hydraulic pump
Air bulbs in the hydraulic
system
The oil viscosity is too much
Leakage in the cylinder
2.
Oil leakage
O-ring seals damaged
Bolts and nuts for copper
coupling surfaces got loose
Poor welding
3.
Steering failure
Mistaken mounting position of
the rotor and follow-up shaft
Failure of the steel ball check
valve in valve body
4.
Fails to steer manually
Check the hydraulic pump and fix up the
troubles if any
Bleed air in the system, check the suction
pipe and fix up the leakage if any
Replace with the specified oil
Replace O-ring seal
Replace with new ones
Tighten the bolts and nuts as required
Re-weld
Bring back to the dealer for repairing
Bring back to the dealer for repairing
Bring back to the dealer for repairing
5.2.6
Hydraulic system
Troubles & possible causes
Fixing methods
1.
Insufficient lifting force or lift
system not working
Too low the oil level or
improper hydraulic oil being
used
Oil strainer clogged
Air being sucked into
hydraulic system
Oil pump seal ring seriously
worn out and inner leaking
seriously
Main control valve seized
Main control valve worn out
seriously
Safety valve failure
Cylinder leaking seriously
Add or replace with proper oil to specified
level
Wash the strainer
Bleed air in the system and tighten
connector or replace seal ring
Replace the oil pump seal ring
Operate lift control lever several times and
shift the main control valve with a screw
driver, if still seized, disassemble and wash
it clean
Replace worn out parts
Readjust or repair safety valve
Replace seal ring or replace the worn out
parts if necessary
