1
Steering wheel difficult to turn.
Priority valve not operating
Check if the priority valve
(continued)
correctly
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.
Steer mode valve not operating
Check if spools sticking,
correctly (4WS Machines only)
rectify as required
Chec k if so leno id s
o p erat ing , rep lac e
solenoids as required
Mechanical failure
Check for damaged axle
c o m p o nent s, suc h 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.
Chec k p um p f lo w , if
req uired servic e o r
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
9803/3280
Section H
10 - 2
Issue 1
Fault Finding