Product Manual

15
13.0 Troubleshooting the JSH Hoist
Trouble Probable Cause Remedy
Motor will not run.
No incoming power, or low voltage.
Check circuit breakers, switches and
connections in power supply lines. If low
voltage, have certified electrician test
incoming power.
Rectifier damaged so that the brake
won’t release.
Have rectifier replaced by qualified
service personnel.
Motor damaged.
Have motor replaced by a qualified
service technician.
Hoist lifts very slowly.
Overloaded. Reduce load.
Low voltage.
Determine cause of low voltage and
bring up to within +/- 10% of the voltage
listed on the hoist nameplate.
Hoist lifts but will not
lower.
Broken conductor in pendant cord.
Test continuity of each conductor.
Replace cable if needed.
Up/down switch malfunctioning. Repair or replace switch.
Hoist lowers but will
not lift.
Overloaded. Reduce load to within hoist capacity.
Up/down switch malfunctioning. Repair or replace switch.
Brake malfunction.
Have brake inspected by qualified
personnel. Replace if needed.
Load continues drifting
down excessively
when hoist is stopped.
Hoist overloaded. Reduce load to within rated capacity.
Grease or oil on the lining.
Have a qualified technician dis-
assemble the brake and clean the
lining.
Brake disc is worn. Replace brake assembly.
Brake springs are damaged.
Replace brake springs (qualified
personnel).
Motor overheats.
Excessive load or too frequent use.
Operate within rated load and according
to duty cycle rating.
Brake drags.
Adjust brake clearance (qualified
personnel).
Poor engagement of
chain with
sprocket/sheave.
Load chain seriously worn. Replace load chain.
Sprocket wheel, sheave or the chain
guide is seriously worn.
Replace parts as needed.
Brake chatters.
Check for greater than allowable air
gap.
Replace brake assembly.
If brake still chatters after being
replaced check rectifier for proper
operation.
Have rectifier replaced by qualified
service personnel.
Limit switch failure.
Bad connection of limit switch leads.
Inspect the contacts of the leads and
limit switches.
Limit switch damaged. Replace limit switch.
14.0 Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-
800-274-6848, Monday through Friday (see our website for business hours, www.jettools.com). Having the
Model Number and Serial Number of your machine available when you call will allow us to serve you quickly
and accurately.