Autoquip FREIGHTLIFT FL4M - Manual (Page 94)

94
PROBLEM POSSIBLE CAUSE AND SOLUTION
Freightlift will not raise
(motor is running or
“humming”).
WARNING! a safety
device may have been
activated – if you are
not familiar with how
safety devices interact
with the operation of
the lift, you must find
someone who does.
Or, call Autoquip
Customer Service at
888-811-9876.
 WARNING! The lifting chains may be disconnected or
broken and slack chain sensing switches missing or
malfunctioning. Check while standing near (but NOT on)
the lift carriage and correct as necessary – once carriage
has been blocked in place.
 The load may exceed the rated capacity of the lift.
Remove any excess load.
 Rotation on the 3-phase motor may be reversed.
Reverse any two motor electrical leads.
 The 3-phase motor may be single-phasing (humming).
Check wiring, fuses, etc.
 The voltage at the motor terminals may be too low to run
the motor with the existing load. Check by measuring the
voltage at the motor terminals (or as near as possible)
while the motor is running under load. Inadequate or
incorrect wiring can starve the motor when the source
voltage is ample. Correct as necessary.
 The motor brake may be seized if the motor is humming,
blowing fuses, or overloads. Remove the motor and
check to see if the brake is working correctly.
Motor labors or heats
excessively.
 The voltage may be low. Check at the motor terminals
while the motor is running under load. Inadequate wiring
can starve the motor even when the source voltage is
ample.
 The wiring may be incorrect. Be sure one leg of the
motor line is not connected to the ground prong. This
can happen particularly on 3-phase units using twist-lock
plugs.
 The gear reducer may be binding from oil starvation.
This can cause high internal heat. The gear reducer can
be irreparably damaged by oil starvation and may have
to be replaced!
Unit operates in a
“spongy” or jerky
fashion.
 The chain sprockets may be binding. Check and repair
 The chain may be off of a sprocket. Check and repair.
 The platform carriage may be binding in the guide ways.
Check and repair.
TROUBLESHOOTING ANALYSIS