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CHAPTER 7. POWER STEERING SYSTEM
Troubles Presumable causes Countermeasures
5. Chassis
a. Excessively worn mechanical parts Lubricate joints or replace defective
ones with new ones.
Steering wheel does not
1. Hydraulic system
return to neutral position
a. Excessively high back pressure Correct.
when releasing it.
2. Orbit-roll
a. Seized orbit-roll due to dust trapped Replace orbit-roll with a new one.
between spool and sleeve
b. Off-set of steering column axis Correct.
c. Broken centring springs Replace with new ones.
Cylinder is not fast 1. Hydraulic system
in responding or a. Trapped air Bleed air out of system.
does not respond to b. Insufficient pump delivery Check pump.
turning of steering
wheel and wheels slip 2. Orbit-roll
excessively. a. Worn internal parts Replace with new ones and re-set
pressure.
b. Too low tightening torque of Correct tightening torque.
end cap screws
c. Mis-installed drive or spacer. Reinstall them properly.
3. Directly connected valve or
other elated valves
a. Dust trapped in over load relief valve
Disassemble, wash, reassemble, and
rest pressure or replace defective
valve assemblies with new ones.
b. Damaged O-rings Replace with new ones.
4. Pump
a. Poor efficiency Replace with a new one.
5. Cylinder
a. Broken piston seal Replace with a new one.
Steering wheel is turned 1. Hydraulic system
in opposite direction Incorrect piping to four ports Check and correct.
against will.
2. Orbit-roll
a. Improperly assembled timing valve Reassemble correctly.
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