6. Excessive deflection of
column under load.
b. A squealing noise from the
top of the column.
1. The brake inside the screw
pulley is squealing
2. The brake spring is rubbing
on the screw pulley.
1. The anchor bolts to the floor
are loose.
2. The bolts securing the
column to the base frame are
loose.
3. There is insufficient support
under the base frames.
4. The overhead frame is loose
1. Inadequate or wrong type of
oil used.
2. There is dirt or contamination
on the lifting screw.
3. The lifting screw is damaged
and is binding inside the lifting
nut.
a. Clean the brake shoe and
inside the screw pulley to
remove all dust.
b. remove the brake shoe and
lightly file the wearing surface
to remove any hard spots.
a. Remove the brake shoe and
bend the spring down slightly to
miss the pulley.
a. Tighten the anchor bolts.
(Refer installation)
a. Tighten the base plate bolts.
(Refer installation)
a. The base frames should be
fully supported, either by the
floor or by packing shims.
(Refer installation)
a. Tighten the nuts on the
uprights and crossbeam. (Refer
installation)
a. Clean out the oil reservoir
and refill it with the correct oil.
(Refer routine maintenance)
b. Clean the lubricating brush
on the safety nut and adjust it
so the bristles are just touching
the bottom of the screw thread.
a. Dismantle the column and
thoroughly clean the lift screw
and nuts. (Refer major service.)
b. Check that the blinds and
rubber sealing strips are fitted
and in good condition. c. Check
that the hoist is not installed
outside, exposed to the
weather and is not being used
for an unsuitable application
e.g. washing or painting
vehicles.
a. Clean the screw and check
for rough or torn threads.
Replace the screw and nuts as
a complete set. Find the cause
of the tearing. (Refer major
service)
Problem
Problem
Symptom
Possible Cause
Remedy
7. Rapid wear on lift nut.
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