Autoquip FREIGHTLIFT FLT - Manual (Page 72)

72
PROBLEM POSSIBLE CAUSE AND SOLUTION
Motor labors or heats excessively.
• The voltage may be low. Check at the motor
terminals while the pump is running under load.
Do not check at the line source or while the pump
is idling. 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 pump may be binding from oil starvation.
This can cause high internal heat. The pump can
be irreparably damaged by oil starvation and may
have to be replaced.
Unit operates in a “spongy” or
jerky fashion.
• The load may exceed the stated capacity of the
unit. Overloading caused the pressure switch
valve to activate and deactivate if the “UP” button
is depressed. The motor may start and stop if
this condition exists. Remove excess load.
• The hydraulic system may have air in it. The unit
requires bleeding (see Air Bleeding Procedures
in the Routine Maintenance section).
• Check for oil starvation.
• The rollers may be binding. Check and repair.
• The platform carriage may be binding in the
guideways. Check and repair.
• The cylinder may be binding internally or
externally. Check and repair.
• The pressure switch may be turning the motor on
and off. Check and repair.
Motor will not turn off when lift
reaches fully raised position
• Relief valve setting is too low and oil is flowing
over relief. Need to adjust setting upward per
instructions in Installation section.
• Pressure switch setting is too high and oil is
flowing over relief. Need to adjust downward per
instructions in Installation section.
TROUBLESHOOTING ANALYSIS