18
9-TROUBLESHOOTING
1�
Motor does not run:
A�
Breaker or fuse blown.
B� Motor thermal overload tripped� Wait for overload to cool�
C�
Faulty wiring connections……Call electrician for service.
D�
Defective up button……Call electrician for service.
2�
Motor runs but will not raise:
A�
A piece of trash is under the check valve. Push handle down and push 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 1/16”.
C� Remove the check valve cover and clean ball and seat�
D�
Oil level too low. Oil level should be just under the vent cap port when the lift is in
the lowered position.
3�
Oil blows out breather of power unit:
A�
Oil reservoir overfilled.
B�
Lift lowered too quickly while under a heavy load.
4�
Motor hums and will not run:
A�
Impeller fan cover is dented. Take off and straighten.
B�
Faulty wiring……Call electrician.
C�
Bad capacitor……Call electrician.
D�
Low voltage……Call electrician.
E�
Lift overloaded……Reduce weight.
5�
Lift jerks going up and down: Air in hydraulic system. Raise lift all the way to top and
return to floor; Repeat 4-6 times. Do not let this overheat power unit.
6�
Oil leaks:
A�
Check the power unit: If the power unit leaks hydraulic oil around the tank-
mounting flange, check the oil level in the tank. The level should be two inches
below the flange of the tank. Check with a screwdriver.
B�
Check the rod end of the cylinder: If the rod seal of the cylinder is out, rebuild or
replace the cylinder�
C�
Breather end of the cylinder: If the piston seal of the cylinder is out, rebuild or
replace the cylinder�
7�
Lift makes excessive noise:
A�
Leg of the lift is dry and requires grease.
B�
Cylinder pulley assembly or cable pulley assembly is not moving freely.
C�
May have excessive wear on pins or cylinder yoke.
