STEERING SYSTEM 5540F/YB5515 SERVICE MANUAL
10-16 Published 10-21-2010, Control# 198-04
Steering fails to respond to selected
mode.
IMPORTANT: The wheels must pass
the proximity sensor to actuate relays
to change steering mode.
1. Selector switch faulty.
2. Proximity switches not operating
correctly.
3. Steering mode valve not
operating.
4. Leaks in relevant hoses or
component connections.
5. Electrical failure.
1. Replace switch.
2. Check setting of proximity switch.
Reset or replace switches.
3. Check if spools are sticking.
Repair or replace.
4. Check hoses and connections for
leaks. Tighten or replace.
5. Check relevant electrical
connectors if problem still persists,
do a wiring continuity check o
relevant circuits.
Wander - Tendency of vehicle to
deviate from course.
1. Air in system.
2. Worn steering linkage.
3. Loose steering cylinder piston.
4. Severe wear in steering orbitrol.
1. Correct condition and add fluid.
Bleed system and load sense line.
2. Repair or replace linkage.
3. Repair or replace cylinder.
4. Repair or replace the orbitrol.
Slip - A slow movement of steering
wheel fails to cause any movement in
steering wheels.
1. Leakage of cylinder piston seals.
2. Worn steering orbitrol.
1. Repair or replace cylinder.
2. Repair or replace orbitrol.
Erratic steering. 1. Air in system due to low level of
hydraulic oil, cavitating pump,
leaky fitting, pinched hose, etc.
2. Loose steering cylinder piston.
3. Sticking check valve.
4. Turning steering wheel too rapidly.
1. Correct condition and add fluid.
Bleed system and load sense line.
2. Repair or replace cylinder.
3. Clean or replace.
4. Slow movement.
Spongy or soft steering. 1. Air in hydraulic system. Most likely
air trapped in cylinders or lines.
2. Low fluid level.
1. Correct conditions. Bleed air out of
system and load sense line.
2. Add fluid and check for leaks.
Free wheeling - Steering. Check wheel
turns freely with no feel of pressure
and no action on steering wheels.
1. Steering column shaft is loose or
damaged.
2. Lower splines of column may be
disengaged or broken.
3. S
teering
orbitrol meter has a lack
of oil. This can happen on start up,
after repair, or long down time
intervals.
4. Steering cylinder piston seal blown
out.
1. Tighten the steering wheel nut.
2. Repair or replace the column.
3. Usually starting engine will cure
the problem. Bleed system if
necessary.
4. Determine cause. Correct and
replace the seal.
Excessive free play at steering wheel. 1. Loose steering wheel nut.
2. Steering column shaft worn or
damaged.
1. Tighten the nut.
2. Repair or replace the steering
wheel connection or column.
Excessive free play at steered wheels. 1. Leaky steering cylinder seals. 1. Replace cylinder seals.
Symptom Probable Cause Action
Reference Only
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