environment shorter interval may be required.
The following items should only be performed by a trained maintenance
expert.
z Replace hydraulic hoses.
z Replace chains and rollers.
z Replace cables and sheaves.
z Replace or rebuild air and hydraulic cylinders as required.
z Replace or rebuild pumps/motors as required.
z Check hydraulic and air cylinder rod and rod end (threads) for deformation or
damage.
z Check cylinder mount for looseness and damage.
Relocating or changing components may cause problems. Each component in the system
must be compatible; an undersized or restricted line will cause a drop in pressure. All valve,
pump and hose connections should be sealed and/or capped until just prior to use. Air
hoses can be used to clean fittings and other components. However, the air supply must be
filtered and dry to prevent contamination. NOTE: Contamination is the most frequent cause
of malfunction or hydraulic equipment.
TROUBLE SHOOTING
1. Motor dose not run:
A. Breaker or fuse is blown.
B. Motor thermal overload tripped. Wait for overload to cool.
C. Faulty wiring connections. Call electrician.
D. Defective up button. Call electrician for checking.
2. Motor runs but will not raise:
A. A piece of trash is under check valve. Push the handle down and the up
button at the same time. Hold for 10-15 seconds. This should flush the system.
B. Check the clearance between the plunger valve of the lowering handle. There
should be 1/16clearance.
C. Remove the check valve cover and clean ball and seat.
D. Oil level should be just under the vent cap port when the lift is down.
3. Oil blows out breather of power unit:
A. Oil reservoir overfilled.
B. Lift lowered too quickly while under a heavy load.
C. Return tube is loose or disconnected.
13
Floor Plate/Overhead Style Lifts
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