Operation Description
46
2.18.1.5 Hydraulic Steering System Faults and Troubleshooting
Table 2-6 Steering System and Running System Faults and Troubleshooting
Free stroke of steering
system is too large
(1) Steering gear thrust bearing worn
(2) Steering gear screw, nut and ball worn
(3) Gear sector and rack worn
(1) Replace bearings or adjust
(2) Replace wearing parts
(3) Adjust
Mechanical and hydraulic
steering is too heavy
(1) Upper ball seat screw of the steering
thrust bearing is too tight
(2) The air pressure of front wheel tire is low
(3) Oil delivery of gear oil pump is not
enough. Gear oil pump leaks inside or oil
screen inside the steering oil tank is blocked,
light at slow speed and heavy at rapid speed
(4) Air exists in steering system, when
rotating steering wheel, oil cylinder
sometimes moves and sometimes does move
(5) Oil level in steering oil cylinder
is insufficient
(6) Spring elasticity in relief valve is weak or
the steel ball is not sealed; a light load is
steering lightly, and steering becomes heavier
if load is increased
(7) Oil viscidity too high
(8) Steel ball check valve in the valve body
fails, steering wheel is heavy when turning it
slowly or quickly, and steering is weak
(9) Oil leakage from steering system,
including inside and outside
(1) Properly tighten upper ball
seat screw
(2) Fill with air according to
the requirements
(3) Check if gear oil pump
is normal. Clean the filter screen
(4) Discharge the system and
check if any air is in the oil
inlet line
(5) Fill oil to the specified level
(6) Wash safety valve and adjust
safety valve spring pressure.
(7) Apply the specified oil
(8) Clean, do maintenance
and change
(9) Check and find the
leaking points
(1) Clearance between taper roller bearing of
front bearing is too large
(2) Steering ball joint is seriously worn
(3) Gasket is worn between the swing shaft
and bracket
(4) Toe-in of front wheel is abnormal
(5) Front wheel ring is seriously worn
(1) Adjust the clearance to the
specified requirements
(2) Replace
(3) Replace
(4) Adjust
(5) Correct
(1) Toe-in of front wheel is abnormal
(2) Pressure in the tire is incorrect
(3) Drive tire thread mounted in reverse
(1) Adjust
(2) Fill the air according
to requirements
(3) Reassemble
(1) Rubber O-rings at various pipe joints are
damaged or loose
(2) O-rings in hydraulic steering gear valve
body, stator and rear cover are damaged
(3) The O-ring at the axle journal is damaged
(4) The bolts at the joint of the steering rack
or the hub subassembly have loosened
(1) Replace the O-ring or tighten
the fitting
(2) Clean or replace the O- ring
(3) Replace the O- ring
(4) Tighten the bolts
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