Anthony Lifgtates, Inc.
30
MRT Models
www.anthonyliftgates.com
800-482-0003
4.12 Air Bleeding Procedure For MRT Liftgates
(Gravity Down Models ONLY!)
This procedure will remove/bleed the air that is trapped
inside the lift cylinders and hoses in the hydraulic circuit
quickly and eff ectively. If this procedure is not performed,
air in the hydraulics will eventually work its way out. Until
then, however, the lift cylinders may be “spongy”, not as
smooth as they normally would be, and the platform may
not remain perfectly level while in motion.
1. Lower the opened (unfolded) platform until the
runners extend below the bottom of the columns so
the lift cylinder piston rods are visible.
2. Remove the stop collar from each of the piston rods
using a hex key. By removing the stop collars, the lift
cylinders will retract slightly more than normal (1/8”)
when fully retracted (platform raised completely).
This opens an internal “bleeder valve” in the piston
and allows the trapped air that was introduced during
installation to be expelled from the hydraulic lift
cylinders.
CAUTION
PINCH POINT HAZARD
Keep hands clear of moving parts. To avoid
possible injury, make sure the platform up/
down switch is not activated while removing or
replacing the stop collars.
ALI-00175
LIFT CYLINDER “STOP COLLAR”
(One on each runner)
RUNNER
(Curbside shown, streetside opposite)
Remove to bleed air from
each of the two lift cylinders.
Replace collar after air is
bled from the lift cylinders.
3. Using the “UP” control switch, raise the liftgate
platform all the way up until the platform stops at
truck/trailer floor level (the lift cylinders will be fully
retracted). Continue to hold the “UP” switch in the
“ON” position for several seconds, until you see oil
start to flow out of the cylinders and into the clear
breather hoses. Once oil starts flowing, STOP! All
the air should now be released.
4. Lower the platform until the lift cylinder piston rods
are exposed below the columns. Replace the collars
onto the piston rods.
