Anthony Lifgtates, Inc.
36
L-501 Models
www.anthonyliftgates.com
800-482-0003
10.3 Troubleshooting Chart
Problem
Possible Causes
Possible Solution
Motor does not run when
control switch is activated.
Cut-off switch.
Turn switch to ON position.
Dead battery.
Make sure battery is fully charged.
Check for loose or corroded battery
connections.
Replace or recharge battery.
Circuit protection (fuse or breaker).
Replace fuse. Refer to “10.2.1
Replacing the Fuse” on page 33.
10 Amp fuse in power unit box.
Replace, if fuse is blown. If problem
persists, check for shorts in the
electrical system.
Motor start solenoid.
Check solenoid. “10.2.2 Checking
Motor Start Solenoid and Power Cut-
off Solenoid” on page 34.
Optional power cut-off solenoid.
Check solenoid. “10.2.2 Checking
Motor Start Solenoid and Power Cut-
off Solenoid” on page 34.
Battery cable.
Replace cable. Refer to “10.2.3
Checking the Power Cable” on page
34.
Motor.
If the motor is determined to be
defective, it should be replaced.
Defective motors are typically caused
by weak batteries (low voltage), loose
connections, corrosion, or a poor
ground.
If the motor does not operate in
freezing conditions, make sure the
motor housing does not contain
water.
Liftgate will not lower to the ground.
Platform operating area is not clear.
Clear area.
Structural damage.
Fix damage. Replace worn parts.
Defective flow control valve.
Replace flow control valve.
Defective control switch.
Check switch for continuity, replace if
defective.
Motor runs, but platform will not raise,
will not raise rated capacity, raises
partially, or raises but drifts down
when control switch is released.
Load capacity has been exceeded.
Verify load capacity and adjust load
weight.
Structural damage.
Replace damaged parts.
Low hydraulic fluid level.
Fill reservoir. Refer to “10.1 Monthly
Inspection” on page 33.
Air in hydraulic lines.
Check oil level in reservoir. “10.1
Monthly Inspection” on page 33.
Low Voltage.
Inspect electrical connections, battery
terminals, and check the battery’s
voltage (9 Volts minimum).
Defective piston seals.
See Maintenance section for
Checking Cylinder for Leakage.
“10.2.4 Checking Cylinder Piston
Seals
(drifting - caused by seal leakage)”
on page 34.
Hydraulic pump is worn.
Replace hydraulic pump.
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