Autoquip FREIGHTLIFT FLT - Manual (Page 73)

73
TROUBLESHOOTING ANALYSIS
Unit won’t lower
- Electrical Circuit
• The emergency stop button may be pressed or
jammed Check and repair.
• The gates or doors may be open. Close and try
again.
• Control transformer fuse may be blown. Check
and replace.
• Manually bleed off the hydraulic pressure with the
lower valve. If the lift lowers, check the electrical
circuit and the down solenoid. If the lift does not
lower, see next section below.
• The solenoid may be incorrectly wired, burned
out, not rated for the voltage, or the line voltage
may be excessively low.
• The timer relay may be malfunctioning. Check
and replace.
• The motor starter auxiliary contacts may be
malfunctioning. Check and repair.
Unit won’t lower
- Hydraulic Circuit
• Check for mechanical obstructions or a binding
condition.
NOTE: Contact a local Autoquip Representative
before attempting to repair the following problems.
• Check for tripped velocity fuses.
• Air in the system will cause a lock up (see Air
Bleeding Procedures in the Routine Maintenance
section).
• Heavy oil will cause a lockup (see Oil
Recommendations in the Routine Maintenance
section).
• Cold temperatures of below 10 degrees F will
cause a lockup (see Oil Recommendations in the
Routine Maintenance section).