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Section H
10 - 2
Fault
1
Steering wheel difficult to turn.
(continued)
2
Steering wheel turns on its own.
3
Machine will not turn when the
steering wheel turned.
9803/3280
Fault Finding
Probable Cause
Priority valve not operating
correctly
Steer mode valve not operating
correctly (4WS Machines only)
Mechanical failure
Dirt in the steer control unit
(causing sleeves to stick open)
Steer control valve centring springs
damaged, broken or missing.
Steer control valve - position of
rotor to shaft slot incorrect.
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
Section H
10 - 2
Action
Check if the priority valve
is st ic k ing , rec t if y as
required.
Check the load sense line
from the steer unit to the
priority valve for signs of
leak ing
o r
p o o r
connection.
Check if spools sticking,
rectify as required
Chec k
if
so leno id s
o p erat ing ,
rep lac e
solenoids as required
Check for damaged axle
c o m p o nent s, suc h as
rams, trackrods, linkages
etc.
Clean and inspect unit.
Check steer unit.
Refer to Hydraulic Steer
Unit - Dismantling and
Assembly.
Correct as required.
Check for leaks and top
up the hydraulic tank as
required.
Check hoses and
connections for leaks
Bleed system - bleed the
load sense line.
Chec k p um p f lo w , if
req uired
servic e
o r
replace pump.
Check pressure setting
of steer unit relief valve,
adjust as required.
Remove and inspect.
Issue 1
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