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.
Mechanical failure. Check for damaged axle
components, such as
rams, trackrods, linkages
etc.
2 Steering wheel turns on its own. Dirt in the steer unit. Clean and inspect unit.
(causing sleeves to stick open)
Steer unit valve centring springs Check steer unit.
damaged, broken or missing.
Steer unit 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 is 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,
service or replace pump
if required.
Steer unit 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.
unit.
Priority valve not operating Check if the priority valve
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.
10 - 2
Fault Probable Cause Action
Section H Steering
9803/7130
Section H
10 - 2
Issue 1
Fault Finding
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