Allmand Brothers TLB 535 - Manual (Page 38)

38
STEERING (continued)
*Thermal Shock - A condition caused when the hydraulic system is operated for some
time without turning the steering wheel so that fluid in the reservoir and system is hot and
the steering control unit is relatively cool (more than 50*F temperature differential). When
the steering wheel is turned quickly the result is temporary seizure and possible damage
to internal parts of the steering control unit. The temporary seizure may be followed by total
free wheeling.
LOADER LIFT AND BUCKET ROLL BACK
The entire system should be evaluated before removing any components. The following is
a list of problems with possible causes and suggestions for correction.
NOTE:
ƒ
It is important to check the loader bucket stops periodically for damage. If the stops are
worn, the cylinder rods may come in contact with the bucket pin grease zerk.
ƒ Check clearance between the rod and the zerk with the bucket rolled to the dump position.
There should be a minimum of 1/2" clearance.
ƒ If not, you must weld on the stop to increase clearance.
PROBLEM POSSIBLE CAUSE CORRECTION
Large particles in meter section Clean the unit
Insufficient hydraulic power Check hydraulic power supply
Severe wear and/or broken pin Replace the unit
STEERING UNIT LOCKS UP
*Thermal Shock Replace the unit
Parts assembled wrong. Steering
unit improperly timed
Correct timing STEERING WHEEL
OSCILLATES OR TURNS BY
ITSELF
Lines connected to wrong ports Reconnect lines correctly
STEERED WHEELS TURN IN
WRONG DIRECTION WHEN
OPERTOR ACTIVATES
STEERING WHEEL
Lines connected to wrong steering
cylinder ports
Reconnect lines correctly
PROBLEM POSSIBLE CAUSE CORRECTION
Worn or malfunctioning pump Repair or replace pump
Stuck relief valve cartridge Repair or replace SLOW LIFT OR ROLL BACK,
LOSS OF POWER
Worn pump allowing system
pressure to be less than specified
Repair or replace pump
Air in the system due to low level of
oil, cavitation of pump, leaky fitting,
pinched hose, etc.
Determine the cause and correct the
problem
Worn, or binding of , mechanical
linkage
Repair or replace linkage
Bending of linkage or cylinder rod Repair or replace
SURGING OF LOADER AND
BUCKET ACTIONS
Loose cylinder piston Repair or replace