Terex RT500-1 - Steering Circuit

Steering Circuit
Most steering problems can be corrected if the problem is properly defined. The entire
steering system should be evaluated before removing any components. The steering
control unit is generally not the cause of most steering problems. The following is a list of
steering problems along with possible causes and suggested corrections.
CONDITION CAUSE REMEDY
SLOW STEERING, HARD
STEERING, OR LOSS OF
POWER ASSIST
Worn or malfunctioning pump Replace pump.
Stuck flow divider piston Replace flow divider.
Malfunctioning relief valve
allowing the system pressure
to be less than specified
Replace the relief valve.
Overloaded steer axle Reduce load.
Leaking or kinked load
sensing signal line
Correct.
Malfunctioning priority valve Check spring and sticking
piston.
Check damping orifices in
both ends of main bore.
Check adjustment See page
5-6.
Check system pressure at
SCU inlet for proper system
pressure. If not correct
replace priority valve relief
cartridge.
WANDER
VEHICLE WILL NOT STAY IN
A STRAIGHT LINE
Air in the system due to low
level of oil, cavitating pump,
leaky fitting, pinched hose,
etc
Correct.
Worn mechanical linkage Repair or replace.
Bending of linkage or
cylinder rod
Repair or replace.
Loose cylinder piston Repair or replace.
Severe wear in steering
control unit
Replace the steering control
unit.
DRIFT
VEHICLE VEERS SLOWLY IN
ONE DIRECTION
Leaking cylinder seals Reseal cylinders.
Worn or damaged steering
linkage
Replace linkage and align
front end.
207REVISED: