Anthony Liftgates AC-1600, Maintenance Manual

Troubleshooting Chart

Problem

Possible Causes

Possible Solution

Platform lowers extremely slow.

Low oil level on power down models.

Fill reservoir with proper fluid. Refer to 

“4.1 Monthly Inspection” on page <?> 

for oil specifications and “4.3 Check 

Power Module Fluid Level” on page 

<?> for oil level. 

Improper oil in hydraulic reservoir.

Fill reservoir with proper fluid. Refer to 

“4.1 Monthly Inspection” on page <?> 

for oil specifications and “4.3 Check 

Power Module Fluid Level” on page 

<?> for oil level. 

Bushing wear where lift arms connect to 

platform.

Replace bushings. Refer to the separate 

Parts Manual.

Damaged or kinked hydraulic hose.

Repair or replace. Refer to the separate 

Parts Manual.

Cylinder rod is scored, pitted, or bent.

Replace the cylinder, repair is not 

practical.  

Replacement part — A‑130113 Cylinder 

3” or A‑130114 Cylinder 4”.

Flow control valve.

Remove flow control valve and hook 

hydraulic hose directly to the cylinder.  

If the cylinder operates properly, replace 

the valve. “4.14 Checking Flow Control 

Valve” on page <?>.  

Replacement part — A‑130102.

Lowering valve (power down models 

only).

Solenoid or cartridge may need 

cleaning or replacement.  Refer to  

section “4.9 Checking Valve Cartridge 

and Solenoid” on page <?>.  

Replacement part — A‑130216.

Motor runs, but platform will not lift 

stated load or drifts down after being 

raised.

Low fluid level has caused air in the 

lines.

Fill reservoir with proper fluid. Refer 

to “4.3 Check Power Module Fluid 

Level” on page <?> for oil level and 

specifications. Raise and lower the 

platform several times to expel any 

trapped air.

Lowering valve stuck in the open 

position (power down models only).

With platform on ground, check, 

remove, and clean valve cartridge using 

the procedure in section “4.9 Checking 

Valve Cartridge and Solenoid” on page 

<?>. If plunger will not move freely, 

replace. Replacement part — A‑130216. 

Damaged cylinder piston seals.

Refer to section “4.12 Checking 

Cylinder Piston Seals” on page <?> for 

additional information.

Relief valve is set too low or clogged 

with contaminants.

Loosen locknut and turn Allen screw 

clockwise to increase pressure. 

Remove and clean if necessary.