Manitowoc Grove 5540F Service Manual page 330

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