LT6KV LIGHT TOWER • OPERATION MANUAL — REV. 2 (07/08/16) — PAGE 71
TROUBLESHOOTING (ELECTRIC HOIST)
Table 16. Electric Hoist Troubleshooting
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Hoist won't operate in either direction
or motor doesn't operate
Power is not connected.
A) Check wiring connections. Check
for 12v at positive (+) terminal on
controller. Check for voltage at F1, F2,
and A terminals with remote switch in
either direction.
Motor tries to power-out but hoist
stalls or locks-up
Load brake failure.
Service or replace load brake.
Hoist operates in both directions but
will not lift rated load
Low voltage at hoist. Motor reaches
hot operating temperature.
A) Be sure wiring cable size
guidelines have been met.
B) Check Condition of battery.
C) Check all power wiring and
connections for corrosion. Clean and
tighten connections.
Hoist slows down and stalls during
power-out
Brake needs service.
Service or replace load brake.
Hoist vibrates badly or is noisy during
lifting or lowering of load.
Brake needs servicing.
Service or replace load brake.
Mounting surface is not flat. Tie rod or
tie bar is bent.
Check to make sure mounting surface
is flat to /- 0.020 in. (0.50
mm). Replace tie rod or tie bar id
necessary. Check for bent or cracked
housings.
