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 lowers extremely slowly.  

Possible Cause #1 Lowering valve not opening fully or is clogged with contaminates.
Action - With platform on ground, remove valve. Inspect and clean valve with parts solvent, then blow out with air. Replace if needed.
(Diagnosis time - 1/2 hr. / Repair time - 15 minutes).
Part Numbers - ATU-121 (Monarch Lowering Valve)
ATU-479 (Fenner Lowering Valve)
Possible Cause #2 Defective pressure compensated flow control valve.
Action - Try lowering platform without valve in place. Clean or replace if found to be contaminated.
(Diagnosis time- 1/2 hr. / Repair time - 1/2 hour).
Part Numbers - A-150035 (AST-1500, AST-2000, ASTL-1800, ATU-1800)
A-150038 (ASTL-2500, AST-2500, ATU-2500)
AR-18-72 (AST-3000, ATU-3000, ATU-3500)
Possible Cause #3 Restricted or pinched hydraulic hose or breather hose.
Action - Check all hydraulic hoses for loose connections or pinching. Replace hose if damaged.
(Diagnosis time - 15 minutes / Repair time - 15 minutes).
Part Numbers - ATU-129 (Hydraulic hose)
ATU 125 ( Return hose)
Possible Cause #4 Cylinder rod scored, or pitted.
Action - Replace cylinder.
(Diagnosis time - 10 minutes / Repair time 1/2 hr.).
Part Numbers - ATU-25100 (AST-1500, ASTL-1800, AST-2000, ATU-1800)
ATU-50100 (ASTL-2500, AST-2500, ATU-2500 CYLINDER)
ATU-75100 (AST-3000, ATU-3000, ATU-3500 CYLINDER)
ATU-25113-WR (ATU-25100 SEAL KIT)
ATU-50123-WR (ATU-50100 SEAL KIT)
ATU-75112 (ATU-75100 SEAL KIT)
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.