Operation Description
38
4
Drive shaft and
sleeve become hot
(4-wheel drive
tractor).
(1) The drive shaft is severely bent or
deformed creating friction.
(1) Replace the drive shaft
5
Auxiliary box
noise (4-wheel
drive tractor).
(2) Speed gear is too high.
(3) Bearing or gear is severely worn.
(2) Put into low gear.
(3) Replace
2.16.1.5 Hydraulic Steering System Faults and Troubleshooting
Table 2-8 Hydraulic System Faults and Troubleshooting
Sequence
No.
Fault Fault Reasons Troubleshooting
1
Oil
leakage.
(1) Rubber o-rings or bolts at various pipe joints are
damaged or loose.
(2) Hydraulic steering gear valve body, stator and rear
cover rubber o-rings are damaged.
(3) Rubber o-ring at the axle journal is damaged.
(4) Leaks in hub subassembly
(1) Replace the rubber ring
or tighten the bolt.
(2) Replace the rubber ring.
(3) Replace the rubber
o-rings.
(4) Tighten the bolts.
2
Heavy
steering.
(1) Not enough oil delivery to the gear oil pump. The
gear oil pump leaks inside or the oil screen inside
the steering oil tank is blocked (light at low speed
and heavy at high speed).
(2) Erratic steering cylinder movement when the
steering wheel is rotated.
(3) The oil level in the steering oil cylinder is
insufficient.
(4) Spring tension in the relief valve becomes weak,
or the steel ball is not sealed, light load is steering
lightly, and steering becomes heavier if load is
increased.
(5) Oil viscosity is too high.
(6) Steel ball check valve in the valve body fails; the
steering wheel is heavy when turning it slowly or
weak when turning sharply.
(7) Oil leakage from steering system, both inside and
outside.
(1) Check the gear oil
pump. Clean the filter
screen.
(2) Discharge the air in the
system and check if air
exists in the oil suction
pipe.
(3) Fill oil to specified
height, clean the relief
valve and adjust the
spring pressure in the
valve.
(4) Replace parts and
components.
(5) Drain oil and replace
with specified oil
(6) Replace valve.
(7) Troubleshoot the point
of the oil leakage and
repair or replce.
3
Steering
column
failure.
(1) Linkage shaft opening is broken or deformed.
(2) Rotor and linkage shafts are improperly mounted.
(3) Steering oil cylinder piston or piston seal ring is
damaged.
(1) Replace the coupled
axle.
(2) Refit.
(3) Replace
4.
Hydraulic
steering
without
power.
(1) Clearance between the rotor and stator is too big
on pump.
(2) Driver does not feel endpoint strongly when
steering with the oil cylinder piston in the extreme
position; when manual steering, the steering wheel
rotates and oil cylinder does not move.
(1) Replace pump.
(2) Replace
5.
Steering
is hard to
turn.
(1) The gap between valve inside and the valve sleeve
is too large.
(2) The gap between interlocking shaft and fork pin is
too large.
(3) The gap between the interlocking shaft and the
rotor is too large.
(4) The return spring plate is broken or too soft.
(1) Replace.
(2) Replace.
(3) Replace.
(4) Replace.
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