Anthony Liftgates don't break often, but even the most rugged parts don't last forever. Damage or normal wear and tear can interfere with normal liftgate operation. We've prepared this section to help guide you step-by-step through the most common troubleshooting procedures for liftgate repair. Simply locate and click the description that most closely matches your issue, then follow the troubleshooting steps outlined on that page.

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Platform will not raise to full raised position.  

Possible Cause #1 Little or no hydraulic fluid in reservoir.
Action -

Fill reservoir to within 1/2' of full with platform on ground with Pennzoil Arctic hydraulic fluid. (Power down models fill to 1/2' of full with platform raised).


(Diagnosis time -10 minutes / Repair time - 10 minutes).

Part Numbers - N/A
Possible Cause #2 Lowering valve stuck partially or fully open.
Action -

With platform on ground, remove lowering valve and inspect. Clean if dirty. Replace if plunger not freely moveable.


(Diagnosis time - 1/2 hr. / Repair time - 15 minutes).

Part Numbers -

ATU-121 (Monarch Lowering Valve)

ATU-479 (Fenner Lowering Valve)

Possible Cause #3

Cylinder piston seals blown allowing fluid to leak past piston when trying to raise platform.Air in hydraulic lines.

*NOTE* (AR-1200 will leak from rod end), (AR-1800 will leak from vent tube).

Action -

Remove breather hose from end of cylinder. Activate power unit to raise position, if hydraulic fluid pumps out o f breather port, repack or replace cylinder. (If under warranty, replace cylinder - DO NOT repack or dismantle.


(Diagnosis time - 10 minutes / Repair time - 1/2 hr.).

Part Numbers -

A-150344 (AR-1200 CYLINDER)

AR-18-77 (AR-1800 CYLINDER)

A-150244 (AR-1200 SEAL KIT)

AR-18-53 (AR-1800 SEAL KIT)

Possible Cause #4 Power unit relief valve on power unit set too low.
Action -

Re-adjust lift chain.


(Diagnosis time -10 minutes / Repair time - 15 minutes).

Part Numbers - N/A
Warranty Information:
Base Warranty:

3 Years on mechanical structure.

2 Years on hydraulic & electrical components.

Warranties are void if genuine Anthony parts are not used.