Terex RT700 - Page 108

TROUBLESHOOTING
RT700 Series Page 5 - 9 Issued: August 2003
BINDING OR POOR CENTERING OF STEERING WHEEL
-CAUSE- -REMEDY-
Binding or misalignment in steering column
or splined input connection ....................................................................................Align column pilot and spline to
steering control unit.
High back pressure in tank line can cause
slow return to center. Should not exceed 300 psi....................................................Check circuit return line for block-
age.
Large particles can cause binding between
the spool and sleeve................................................................................................Clean unit and filter oil. If another
component has failed, generating
contaminents, flush system while
bypassing steering control unit.
STEERING UNIT LOCKS UP
-CAUSE- -REMEDY-
Large particles in meter section ..............................................................................Clean the unit.
Insufficient hydraulic power (units over 15 in
3
).....................................................Check hydraulic power supply.
Severe wear and/or broken pin................................................................................Replace the unit.
Thermal shock* .......................................................................................................Replace the unit.
STEERING WHEEL OSCILLATES OR TURNS BY ITSELF
-CAUSE- -REMEDY-
Parts assembled wrong. Steering unit improperly timed.........................................Correct timing.
Lines connected to wrong ports ..............................................................................Reconnect lines correctly.
Leaking seal in rotary manifold ..............................................................................Reseal.
STEERED WHEELS TURN IN WRONG DIRECTION
WHEN OPERATOR ACTIVATES STEERING WHEEL
-CAUSE- -REMEDY-
Lines connected to wrong cylinder ports ................................................................Reconnect lines correctly.
3-way steering valve malfunctioning......................................................................See “Operator Controls”.
Cab facing toward rear reverses response...............................................................Be alert when operating with cab
over rear.
STEERING WHEEL KICKS AT START OF STEERING
-CAUSE- -REMEDY-
No inlet check valve on steering control unit..........................................................Install a check valve.