253273 R3
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Section
4 Troubleshooting
The following table lists problems that may be encountered on your Lift Tek Mast, the probable causes and rec-
ommended corrective action that should be taken to restore the mast to normal operating condition.
PROBLEM
PROBABLE CAUSE
SOLUTION
Empty
a)
Plugged inlet hose
a)
Unplug hose or replace.
b)
Insufficient oil.
b)
Check the truck hydraulic system for
correct oil level in tank, defective pump or
pump drive, leaks in the lines or
disconnect control valve linkage. Repair
or replace as necessary.
c)
Bent or jammed plunger.
c)
Repair or replace as necessary.
Loaded
a)
Plugged piston check valve.
a)
Unplug check valve or replace.
b)
Truck relief valve setting low.
b)
Raise truck relief setting to specified level
c)
Over capacity.
c)
Reduce load to specified capacity.
d)
Mechanical bind due to bent plunger
d)
Remove mechanical bind by
or bad rollers.
replacing/freeing plunger and rollers.
Cylinders drift
a)
External leak in pressure line.
a)
Tighten or replace as necessary.
b)
Truck valve defective-cycle to full
b)
Repair or replace truck valve.
lift height to verify.
c)
External leaks at retainer.
c)
Replace all cylinder seals.
d)
Piston check valve leaking.
d)
Replace check valve.
Spongy or jerky action
a)
Sticky or defective truck relief valve.
a)
remove and check the truck relief valve. If
contaminated oil caused the malfunction,
drain and flush the system, change the
filter and refill with fresh oil.
b)
Bent or damaged cylinder plunger.
b)
Disassemble, check and repair cylinder
assembly.
c)
Load rollers not properly adjusted
c)
Adjust or replace as necessary.
or defective.
d)
Mast channels improperly lubricated.
d)
Lubricate mast.
e)
Low Battery charge.
e)
Charge battery.
f)
Low pump volume.
f)
Install accumulator.
g)
Low oil level.
g)
Fill oil reservoir.
h)
Insufficient hydraulic tank capacity
h)
Install larger tank baffles
or baffles.
Weldments banging
during lowering
a)
Insufficient cushion oil exists below
a)
Replace Main Lift cylinder seals.
the Main Lift cylinder to properly
dampen the Weldment transition.
Cylinders don’t lift load
or won't move
WARNING:
Extreme care should be used when working on a unit when the carriage (with or without a
load) is in the raised position.
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