Allmand Brothers TLB 535 - Manual (Page 36)

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PROBLEM POSSIBLE CAUSE CORRECTION
Worn or malfunctioning pump Replace pump
Stuck flow divider in gear pump
Replace flow divider cartridge in gear
pump
Malfunctioning relief valve allowing
system pressure to be too low
Replace the relief valve
Overloaded steering axle Reduce the load
Leaking or kinked load sensing signal
line. Correct
SLOW
STEERING, HARD
STEERING, OR
LOSS OF POWER
ASSIST
Malfunctioning priority valve
Check spring and sticking spool.
Check dampin orifices in both ends of
main bore for debris. Check system
pressure at SCU inlet for proper
system pressure. If not, correct
replace priority valve relief cartridge.
Air in the system due to low level of
oil, cavitation op pump, leaky fitting,
pinched hose, etc.
Correct as needed
Worn mechanical linkage Repair or replace
Bending of linkage or cylinder rod Repair or replace
Loose cylinder piston Repair or replace
WANDER-
VEHICLE WILL
NOT STAY IN A
STRAIGHT LINE
Severe wear in steering orbitrol Repair or replace
DRIFTS-VEERS
SLOWLY IN ONE
DIRECTION
Worn or damaged steering linkage Replace linkage and align front end
STEERING
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.
D - HYDRAULIC SYSTEM (continued)
Hydraulic System Pressures
ƒ Steering 1500 p.s.i.
ƒ Main circuit (Loader) 2500 p.s.i.
ƒ Main circuit (Backhoe) 2150 p.s.i.
Hydraulic System Flows
ƒ Main circuit 6 g.p.m
PROBLEM POSSIBLE CAUSE CORRECTION
NO LOADER LIFT
OR BUCKET
ROLLBACK
Inadequate pressure Inspect, clean or replace relief valve
Fluid flow to loader cylinders too high
or too low.
Inspect or replace priority valve
Cold hydraulic fluid
Warm hydraulic fluid by running
engine
INAPPROPRIATE
LIFT SPEED
Low engine R.P.M.
Move throttle control to fast position to
increase R.P.M
.