1 Steering wheel difficult to turn. Priority valve not operating Check if the priority valve
(continued) correctly is sticking, rectify as
required.
Check the load sense line
from the steer unit to the
priority valve for signs of
leaking or poor
connection.
Steer mode valve not operating Check if spools sticking,
correctly (4WS Machines only) rectify as required
Check if solenoids
operating, replace
solenoids as required
Mechanical failure Check for damaged axle
components, such as
rams, trackrods, linkages
etc.
2 Steering wheel turns on its own. Dirt in the steer control unit Clean and inspect unit.
(causing sleeves to stick open)
Steer control valve centring springs Check steer unit.
damaged, broken or missing.
Steer control valve - position of Refer to Hydraulic Steer
rotor to shaft slot incorrect. Unit - Dismantling and
Assembly.
Correct as required.
3 Machine will not turn when the Insufficient hydraulic fluid. Check for leaks and top
steering wheel turned. 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.
10 - 2
Fault Probable Cause Action
Section H Steering
9803/3280
Section H
10 - 2
Issue 1
Fault Finding
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