1. Motor will not run.
2. Motor runs but hoist will not lift.
3. Hoist squeaks when operating.
4. Hoist creeps down under load.
5. Safety clutches operate when
hoist is fully lowered to floor.
6. Hoist motor will not stop at full
height.
7. Hoist will not lower.
8. Column hook will not engage
freely.
9. Column hooks will not
disengage.
a) No power to hoist.
b) Thermal overload has tripped.
c) Top limit switch is damaged.
d) Wiring has loose connections.
e) Contactor faulty.
f) Raise switch faulty.
g) Motor faulty.
a) Lack of oil.
b) Hoist is overloaded.
c) Motor direction is wrong.
d) Solenoid valve stuck open.
e) Relief valve stuck open.
f) Burst hose.
g) Failure of motor - pump
coupling.
a) Dry clutch rods or clutch
pulleys.
b) Failed cable pulley bearing.
a) Dirt under solenoid valve seat.
b) Dirt under check valve seat.
c) Dirt under relief valve seat.
d) Leaking seal in cylinder.
e) Leak in pipework.
a) Hoist is on an obstruction.
b) Cables have stretched.
a) Cables have stretched.
b) Lack of oil
c) Limit switch arm is loose.
d) Limit switch is faulty.
a) Burst hose.
b) Clutches engaged.
c) Failed cable.
d) Solenoid valve not opening.
e) No power to hoist.
f) Solenoid faulty.
g) Lower switch faulty.
h) Wiring is loose.
a) Pivot is dry or corroded.
b) Spring is broken.
c) Air cylinder seized.
a) No air pressure.
b) Air line has leak.
c) Air line is kinked.
d) Air cylinder seal is leaking.
e) Air cylinder head seized.
Check the mains isolator is on and
fuses are OK.
Reset thermal overload.
Replace limit switch.
Tighten all connections.
Replace contactor.
Replace switch.
Replace motor.
Top-up reservoir.
Check load (4t maximum).
Reverse direction.
Clean valve assembly.
Clean valve.
Replace hose.
Replace coupling.
Lubricate with SAE 140 oil.
Replace pulley bearing.
Clean valve assembly.
Clean valve.
Clean valve.
Replace seal.
Raise hoist, remove obstruction.
Adjust cables.
Adjust cables.
Top-up reservoir.
Tighten arm.
Replace switch.
Replace hose.
Raise hoist to release clutches, adjust
cables.
Replace cables.
Clean and check operation of valve.
Check the main isolator is on and
fuses are ok.
Fit new solenoid.
Replace switch.
Tighten all connections.
Clean & lubricate pivot.
Replace spring.
Repair cylinder.
Check for air at filter/lubricator.
Find and fix leak.
Find and replace kinked tube.
Dismantle & repair cylinder.
Lubricate cylinder.
FAULT
POSSIBLE CAUSE
REMEDY
FAULT DIAGNOSIS
Page 10
Tighten fittings.
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