10 - 1
Fault Finding Contents
Page No.
Introduction 10 - 1
Steering wheel difficult to turn 10 - 1
Steering wheel turns on its own 10 - 2
Machine will not turn when the
steering wheel turned. 10 - 2
Steering fails to respond to
selected mode (4WS Machines only) 10 - 3
Section H Steering
9803/3280
Section H
10 - 1
Issue 1
Fault Finding
Fault Probable Cause Action
1 Steering wheel difficult to turn. Tyres not inflated to Inflate tyres to correct
correct pressure pressure
Insufficient hydraulic fluid. Check for leaks and top
up the hydraulic tank as
required.
Leaks in the relevant hoses or Check hoses and
component connections connections for leaks
Air in the hydraulic system. Bleed system - bleed the
load sense line.
Low pump flow. Check pump flow, if
required service or
replace pump.
Steer relief valve set Check pressure setting
incorrectly of steer unit relief valve,
adjust as required.
Worn or damaged parts in the steer Remove and inspect.
control valve.
....... continued
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.
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