MRT Models
45
Anthony Lifgtates, Inc.
800-482-0003
www.anthonyliftgates.com
8. Troubleshooting
8.1 Troubleshooting Guide
Troubleshooting Chart
Problem
Possible Causes
Possible Solution
Motor does not run when
control switch is activated.
Cab cut-off switch.
Turn switch located in pump enclosure to
ON position.
Dead or low battery.
Make sure battery is fully charged.
Check for loose or corroded battery
connections.
Replace or recharge battery.
Corroded or loose wire connections.
Check all wire connections on power
unit for corrosion or looseness. Replace
defective terminals with “heat shrink”
factory type terminals. Check main
power cable from batteries, to circuit
breakers, to cut-off switch, to power unit.
Blown circuit breaker(s).
(Located near the batteries.)
Reset or replace circuit breaker(s).
(A-150495)
Blown 10 Amp fuse in power unit box. Replace, if fuse is blown. If problem
continues, check for shorts in the
electrical system.
Defective Control box switch.
Check switch. Replace if defective.
Motor start solenoid.
Check solenoid. Replace if defective.
Optional power cut-off solenoid.
Check solenoid. Replace if defective.
Defective 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 liftgate is installed on a semi trailer, make sure the battery wire is two gauge or
heavier. Smaller wires can reduce the voltage, resulting in motor failures.
If the motor does not operate in freezing conditions, make sure the motor housing
does not contain water.
Motor runs, but liftgate will not
lower to the ground.
Structural damage.
Fix damage. Replace worn parts. Check
clearance between platform and dock
bumpers.
Defective control switch.
Check switch. Replace if defective..
Defective lowering valve coil.
Check the coil. “7.2.1 Check Lowering
Valve Cartridge And Coil” on page 42.
Defective lowering valve cartridge.
(A-176305)
Check, remove, and clean valve cartridge
using the procedure in the Maintenance
section.
Defective Flow control valve.
Replace the flow control valve. See the
Flow Control Valve section
Low Voltage
Recharge battery (if less than 9 volts).
Defective hydraulic pump and motor
Replace power unit
