Operation Instruction
(4) Steering cylinder piston or piston sealing ring is
damaged.
(4) Replace piston or sealing
ring
4.
There is no
manual
steering
(1)
The clearance between the rotor and stator is
excessive.
(2) In case of power steering, the driver can not
obviously feel that the piston is already at extreme
position. When manual steering, steering wheel
rotates but the cylinder does not.
(1) Replace stator and rotor.
(2) Replace piston sealing ring
5.
Insensitive
steering
(1) The clearance between th
sleeve is excessive.
(2)
Clearance between universal drive shaft and pull
pin is excessive.
(3)
Clearance between universal drive shaft and rotor
is excessive.
(4) Return spring leaf is broken or too soft.
(1) Replace it
(2) Replace it
(3) Replace it
(4) Replace it
3.16.1.6 Hydraulic hitch system failure and troubleshooting
Table 3-8 Hydraulic hitch system failure and troubleshooting
Index: Failure Cause Troubleshooting
1
Hydraulic
hitch system
could not
lift neither
at light duty
nor at heavy
duty.
(1) The oil level in the lifter housing is
too low.
(2)
The filter screen of oil filter is
severely clogged.
(3)
There is air in the oil absorption
pipeline.
(4) Gear pump is invalid.
(5)
The elastic pin at outmost or
in
nermost of control handle comes
off.
(6)
Swing lever in the distributor
comes off.
(7)
Main control valve is stuck at
neutral or lowering position or the
oil return valve is stuck at opening
position.
(8) Main control valve is stuck
(9) lowering valve is stuck
(10)
The pin is shorten or the lowering
valve assembly is loose and rotated
out, causing un-
lowering valve.
(11)
The oil pipeline from the cylinder
head to cylinder is closed.
(1) Fill oil to specified level.
(2) Replace or replace filter screen.
(3) Check the pipeline joint.
(4) Check, repair or replace gear pump
(5) Reinstall elastic pin.
(6)
Open the distributor and install the
swing lever.
(7)
Dismantle the distributor to clean all
valves
(8) Clean the main control valve.
(9) Clean the lowering valve.
(10)
Remove the descent valve clogging,
readjust the clearance of descent valve
pull pin or tighten the descent valve
assembly.
(11) Open the oil pipeline.
2
It could rise
at light-duty.
While it
could not
rise or rise
slowly at
heavy-duty.
(1)
There is air in the oil absorption
pipeline.
(2) Adjusting pressure of system relief
valve is too low.
(3) Adjusting pressure of cylinder relief
valve is too low.
(4) Gear pump is severely worn out,
(1) Check the oil absorption pipeline and oil
filter.
(2) Repair of replace system relief valve.
(3) Adjust of replace cylinder relief valve.
(4) Repair or replace gear pump
11
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