Anthony Lifgtates, Inc.
46
MRT Models
www.anthonyliftgates.com
800-482-0003
Troubleshooting Chart
Problem
Possible Causes
Possible Solution
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. “7.1.1 Monthly Inspection”
on page 40.
Low Voltage.
Inspect the battery connection terminals
and check the battery’s Voltage (9 Volts
minimum).
Dirty or Defective Lowering valve.
Solenoid or cartridge may need cleaning
or replacement. See Maintenance
section. “7.2.1 Check Lowering Valve
Cartridge And Coil” on page 42.
Defective piston seals.
See Maintenance section for Checking
Cylinder for Leakage. “7.2.2 Inspect
Cylinder Piston Seals” on page 42.
Hydraulic pump is worn.
Replace hydraulic pump.
Air in the hydraulic hose(s).
Check oil level in reservoir. Fill to within
1/2” of full with platform on ground.
Power down models fill to within 1/2” of
full with platform raised. “7.1.1 Monthly
Inspection” on page 40.
Cylinder piston seals blown, allowing
fluid to leak past piston when trying to
raise platform.
Remove breather hose from end of
cylinder. Activate power unit to raise
position, if hydraulic fluid pumps out of
breather port, replace cylinder.
Lowering valve stuck partially or fully
open.
With platform on ground, remove
lowering valve and inspect. Clean if dirty.
Replace if plunger not freely moveable.
Foaming oil.
Air in the hydraulic hose(s).
Check oil level in reservoir. Fill to within
1/2” of full with platform on ground.
Power down models fill to within 1/2” of
full with platform raised. “7.1.1 Monthly
Inspection” on page 40.
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.
Liftgate will not open.
Platform operating area is not clear.
Clear platform operating area.
Blown circuit breaker
Check all connectors and connections
for worn or loose parts, replace any
worn terminals with “heat shrink” factory
terminals. Reset circuit breaker.
Blown in-line fuse.
Replace blown fuse with 10 Amp ATO or
ATC fuse.
Bad opening valve coil.
Remove coil from cartidge and test
magnetism of inside of coil with metal
object (screwdriver) while energizing
down control side of switch only.
Clogged or bad opening valve on
power unit.
Remove valve, clean and inspect. If
plunger will not move freely, replace.
