Allmand Brothers TLB6235 Tractor - Manual (Page 35)

35
*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:
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.
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. If not, you must weld on the stop to increase
clearance.
PROBLEM POSSIBLE CAUSE CORRECTION
Worn or malfunctioning
pump
Repair or replace pump
Stuck relief valve cartridge Repair or replace pump
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 pump
linkage
Bending of linkage or
cylinder rod
Repair or replace pump
Loose cylinder piston Repair or replace pump
Cold hydraulic fluid
Warm fluid with engine
at idle speed
Engine speed is too low Open throttle
Oil leaking past control
valve
Repair or replace worn
section
Oil too heavy Use recommended oil
Pump damaged or worn Repair or replace pump
Oil leaking past cylinder
seals
Replace seals
Dirty return oil filter Replace return oil filter
Faulty relief valve
Clean or replace relief
valve
SURGING OF
LOADER AND
BUCKET ACTIONS
SLOW LIFT OR
ROLL BACK,
LOSS OF POWER
LOADER AND
BUCKET ACTIONS
TOO SLOW