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Section H
10 - 1
Fault Finding Contents
Introduction
Steering wheel difficult to turn
Steering wheel turns on its own
Machine will not turn when the
steering wheel turned.
Steering fails to respond to
selected mode (4WS Machines only)
Fault
1
Steering wheel difficult to turn.
9803/3280
Fault Finding
Page No.
10 - 1
10 - 1
10 - 2
10 - 2
10 - 3
Probable Cause
Tyres not inflated to
correct pressure
Insufficient hydraulic fluid.
Leaks in the relevant hoses or
component connections
Air in the hydraulic system.
Low pump flow.
Steer relief valve set
incorrectly
Worn or damaged parts in the steer
control valve.
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Steering
Introduction
The purpose of this section is to help you trace hydraulic
faults to a faulty unit (valve, actuator, ram etc). Once you
have traced the faulty unit, refer to the appropriate
dismantling, inspecting and test instructions given elsewhere
in the steering section.
To help identify circuits, valves, rams etc mentioned in the
fault finding procedures, refer to the hydraulic schematic
diagrams (near the beginning of the Hydraulics Section).
1
Before you begin fault finding, read the Safety
information at the beginning of this manual.
2
Make simple checks before say, stripping a major
component.
3
Make sure that the hydraulic fluid is at correct working
temperature (50 °C, 122 °F).
4
What ever the fault, check the condition of the hydraulic
fluid. Drain and replace if necessary.
5
Make any relevant electrical checks before moving on
to the hydraulics.
6
Be sure to remove ALL contamination and if possible
identify its origin. It may be part of a component from
elsewhere in the circuit.
7
Replace any seals such as 'O' rings before re-
assembling hydraulic components.
Section H
10 - 1
Action
Inflate tyres to correct
pressure
Check for leaks and top
up the hydraulic tank as
required.
Check hoses and
connections for leaks
Bleed system - bleed the
load sense line.
Check pump flow, if
required
service
or
replace pump.
Check pressure setting
of steer unit relief valve,
adjust as required.
Remove and inspect.
....... continued
Issue 1
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