ETU Maintenance
17
Anthony Liftgates, Inc.
800-482-0003
www.anthonyliftgates.com
Troubleshooting Chart
Problem
Possible Causes
Possible Solution
Motor runs, but liftgate will not open or
lower to the ground.
Structural damage. Check clearance
between platform and dock bumpers.
Fix damage. Replace worn parts.
Flow control valve.
Remove flow control valve and hook
hydraulic hose directly to the cylinder.
If the cylinder operates properly, replace
the valve. “3.4.7 Checking Flow Control
Valve” on page 11.
Motor runs, but platform will not raise,
will not raise rated capacity, or raises
but drifts down when control switch is
released.
Load capacity has been exceeded.
Verify load capacity and adjust load
weight.
Structural damage.
Replace damaged parts.
Low fluid level.
Fill reservoir. “3.4.1 Adding Fluid to
Power Unit Reservoir” on page 9.
Low Voltage.
Inspect the battery connection
terminals and check the battery’s
Voltage (9 Volts minimum).
Defective piston seals.
See Maintenance section for Checking
Cylinder for Leakage. “3.4.5 Checking
Cylinder Piston Seals for Drift” on page
10.
Hydraulic pump is worn.
Replace hydraulic pump.
Liftgate will not open.
Platform operating area is not clear.
Clear platform operating area.
Latch chain is connected.
Activate the “UP” switch and release the
latch chain.
Platform lowers extremely slow.
Improper oil in hydraulic reservoir.
See Monthly Inspection. “3.1 Monthly
Inspection” on page 8.
Bushing wear where lift arms connect to
platform.
Replace bushings.
Damaged or kinked hydraulic hose.
Repair or replace.
Cylinder rod is scored, pitted, or bent.
Replace cylinder.
Flow control valve.
Remove flow control valve and hook
hydraulic hose directly to the cylinder.
If the cylinder operates properly, replace
the valve. “3.4.7 Checking Flow Control
Valve” on page 11.
Platform raises partially and stops.
Load capacity has been exceeded.
Verify load capacity and adjust load
weight.
Structural damage.
Replace damaged parts.
Low Voltage.
Recharge battery (if less than 9 Volts).
Low pressure.
Refill reservoir. Check pump and motor.
“3.1 Monthly Inspection” on page 8.
Platform will not lower.
Platform operating area is not clear.
Clear area.
Structural damage.
Replace damaged parts.
Low Voltage.
Recharge battery (if less than 9 Volts).
Hydraulic pump and motor.
Replace power unit.
Summary of Contents for ETU-20-44
Page 2: ......
Page 18: ...Anthony Liftgates Inc 18 ETU Maintenance www anthonyliftgates com 800 482 0003 NOTES ...
Page 19: ......
