DAF CF65, CF75, CF85 Series . Manual — part 945
©
200423
1
Contents
DIAGNOSTICS
ΧΦ65/75/85 series
7
1
1 Diagnostics
CONTENTS
Page
Date
DIAGNOSTICS
2
©
200423
Contents
1
ΧΦ65/75/85 series
7
©
200423
1-1
Steering gear, general
DIAGNOSTICS
ΧΦ65/75/85 series
7
1
1. STEERING GEAR, GENERAL
1.1 FAULT-FINDING TABLE
SYMPTOM: HEAVY STEERING, TO BOTH SIDES
Possible cause
Remedy
Tyre pressure of steerable wheels too low
Check the tyre pressure. Increase tyre pressure to
the specified value.
Fifth-wheel coupling damaged or insufficiently
lubricated.
Inspect/lubricate fifth-wheel coupling.
Axle load of steerable axle(s) too high
Check axle load.
Adjust the load.
Steering oil level too low
Check steering oil level.
Top up oil and bleed system.
Check system for leaks.
Air in the system
Bleed the system.
Check steering oil for foaming.
Filter is extremely filthy
Check filter. If necessary, replace the O-ring.
Steering oil line kinked or pinched off
Check routing of the steering oil lines.
The supply opening in the reservoir is (partially)
blocked.
Check supply opening in the reservoir.
Tight steering shaft bearings or universal joint(s) of
steering column
Jack up steerable axle(s) and check the steering
column tightening torque.
Tight swivel axle bearing
Check steerable axle(s).
Excessive caster
Check caster. Reduce if necessary.
System pressure too low
Check maximum system pressure.
Replace pressure-limiting valve or steering pump.
Steering pump output too low
Check pump output.
Check whether the flow control valve is jammed.
If necessary, replace steering pump.
Excessive internal leakage of steering box or slave
cylinder (if fitted)
Check internal leakage of steering box/slave
cylinder.
DIAGNOSTICS
1-2
©
200423
Steering gear, general
1
ΧΦ65/75/85 series
7
SYMPTOM: HEAVY STEERING, TO ONE SIDE
Possible cause
Remedy
Tyre pressure of steerable wheels too low
Check the tyre pressure. Increase tyre pressure to
the specified value.
Fifth-wheel coupling damaged or insufficiently
lubricated.
Inspect/lubricate fifth-wheel coupling.
Steering oil level too low
Check steering oil level.
Top up oil and bleed system.
Check system for leaks.
Air in the system
Bleed the system.
Check steering oil for foaming.
Wheel deflection limiting valves incorrectly
adjusted.
Check setting of the wheel deflection limiting
valves.
Tight swivel axle bearing
Check steerable axle(s).
Misalignment of the universal joints of the steering
column
Check/adjust position of the universal joints in
relation to each other.
Excessive internal leakage of steering box or slave
cylinder (if present) on one side
Check internal leakage of steering box/slave
cylinder.
SYMPTOM: HEAVY STEERING, OCCASIONALLY
Possible cause
Remedy
Fifth-wheel coupling damaged or insufficiently
lubricated
Inspect/lubricate fifth-wheel coupling.
Steering oil level too low
Check steering oil level.
Top up oil and bleed system.
Check system for leaks.
Air in the system
Bleed the system.
Check steering oil for foaming.
The steering oil line is temporarily kinked or
pinched off
Check routing of the steering oil lines.
Supply opening in the reservoir temporarily
blocked
Check reservoir for impurities.
Steering pump output too low because flow control
valve is jammed
Check the flow control valve for smooth operation.
Low steering pump output in "cold condition" and at
low engine speed because the partitions jam in the
rotor
Check pump output when steering pump is "cold".
Replace steering pump.
Excessive internal steering box leakage at lower
pressures
Check internal steering box leakage at a preset
pressure of 15 - 30 bar.
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