Harrington Hoists and Cranes SH Hoist - Manual (Page 8)

8
TROUBLE SHOOTING
Trouble Cause Remedy Remarks
Will not move.
Will not lift.
Broken fuse Replace fuse of same
rating Do not use copper wire
as substitute. Do not
use fuse of larger rating.
Broken limit switch Replace limit switch
Broken condensor Replace with new ones. Replacement should be
made as one complete
set (1 pair).
Voltage drop Check the voltage with
a voltohm meter and
check wiring. Interrupt the operation.
Discontinuity in power
supply cable
Discontinuity in push
button control cord Check discontinuity in
the cable where cable is
subject to frequent
bending, and repair
cable and cord. The motor turns
immediately but does
not rotate.
Overload Check the weight of the
load.
Slipping due to poor
friction clutch
performance Replace with factory
adjusted friction clutch.
Brake slips Worn brake shoe Replace brake shoe if
necessary.
Clicking sound is heard Worn load chain
Rusted load chain
Replace load chain if
necessary.
Trolley will not stop Angulation of beam
Oil-stained beam Correct the angulation
Remove oil, clean
Electrical leak Poor grounding work Provide correct
grounding Leak at places other
than the electric chain
hoist may sometimes be
responsible.
Foreign matters or
moisture depositing on
electrical parts Remove foreign matter
from or dry the electrical
parts.
Oil leak Oil plug missing Install the regular oil
plug. If oil leak occurs at
places other than oil
plug, disassemble and
check thoroughly for the
cause and repair.
Loose oil plug Tighten the plug.
Oil plug packing missing Use new packing.