Anthony Liftgates MTU-GLR Series, Maintenance Manual

Anthony Liftgates, Inc. 

20 

MTU-GLR Maintenance

www.anthonyliftgates.com  

800-482-0003

7.  Troubleshooting Chart

Troubleshooting Chart

Problem

Possible Causes

Possible Solution

Motor does not run when  

control switch is activated.

Cab 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.

10 Amp fuse in power unit box.

Replace, if fuse is blown.  If problem 

continues, check for shorts in the 

electrical system.

Control box switch.

Check fuse. “4.5 Replacing the Fuse” on 

page 12.

Motor start solenoid.

Check solenoid. “4.6 Checking Motor 

Start Solenoid and Power Cut-off 

Solenoid” on page 12

Optional power cut-off solenoid.

Check solenoid. “4.6 Checking Motor 

Start Solenoid and Power Cut-off 

Solenoid” on page 12.

Battery cable.

Connect motor directly to a spare 

battery using the procedure in the 

Maintenance section.

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 2 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.

Sagging platform.

Normal wear.

Add shims to platform. “4.4 Platform 

Adjustment” on page 11.

Bushing wear where lift arms connect to 

platform.

Replace bushings.

Structural damage.

Replace worn parts.

Foaming oil.

Air in the hydraulic hose(s).

Check oil level in reservoir. “4.1 Monthly 

Inspection” on page 10.

Broken or loose fluid return tube.

Remove the oil reservoir and make sure 

the return tube is below the oil level.  

If the tube has turned or fallen out, 

reinstall it into the pump housing.  Use 

a center punch to “stake” the tube into 

position.