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THESE LINES ARE CROSSED. IT WILL ALSO CAUSE DAMAGE TO THE
SYSTEM AND PRESENTS A POSSIBLE SAFETY HAZARD.
J. Make certain that all connections are made per the Hydraulic Schematic and the return lines
are connected to the tank. Attach the hoses to each other or to stationary objects along the way to
make a neat installation. If any chafe points are evident, slip a large piece of hose or chafe guard
over the hose(s) at the chafe point and secure.
K. Using a pressure gage, set the PRESSURE RELIEF VALVE that is installed upstream of the
FLOW DIVERTER to 100 PSI HIGHER than the hoist Relief. Example: Hoist Relief is set to
1500 PSI. Set the main PRV to 1600 PSI.
L. Bleed the system as follows: Start the truck and slowly engage the PTO to activate the
hydraulic system. Operate the COVER-UNCOVER valve to make the arms move toward the
rear (COVER). Go up only a few feet, then operate the valve to move the arms toward the front
(UNCOVER). Move the arms back and forth a few times to fill the cylinders with oil.
NOTE: DO NOT ALLOW THE ARMS TO GO OVER "CENTER" UNTIL THE
CYLINDERS ARE FILLED WITH OIL. IF THEY ARE ALLOWED TO GO
OVER "CENTER" YOU WILL NOT BE ABLE TO CONTROL THEIR
DOWNWARD MOVEMENT WHICH COULD CAUSE DAMAGE TO THE
UNIT OR PERSONAL INJURY.
NOTE: IF THE ARMS WILL NOT MOVE UPWARD FROM THE ROLL REST, YOU
WILL HAVE TO ADJUST THE PRESSURE RELIEF ON THE COVER
CONTROL VALVE. REMOVE THE CAP AND TURN THE ADJUSTING
SCREW 1/4 OF A TURN CLOCKWISE AND TRY THE SYSTEM. REPEAT
UNTIL THE ARMS MOVE SMOOTHLY AND IN UNISON.
With the Arms at the front of the truck and the STABILIZER BAR sitting in the LOW ARM
RESTS, crack open the fittings at the base end of the cylinders to let any air escape that may be
trapped inside. Re-tighten the fittings and run the unit so the arms are at the rear of the truck and
the rack is against the stop. Crack open the fittings at the rod end of the cylinders to let any air
escape that may be trapped in that end of the cylinders. Re-tighten the fittings and run the unit
back and forth a few times.
Re-bleed the cylinders as above and run again. Check to make sure the unit "COVERS" when
the valve handle is moved in that direction. If not, the hoses are reversed. Correct as necessary.
M. Bleed the GANTRY CYLINDER in the same manner as that of the arm cylinders. Operate
the Gantry "UP and DOWN" to make certain it is working properly.
Be sure to lift the arms up off of the ROLL ASSEMBLY before moving the GANTRY.
Check to make sure the Gantry moves "UP" when the valve handle is moved in that direction.
Correct as necessary.
NOTE: IN ORDER FOR THE SYSTEM TO OPERATE PROPERLY, ALL AIR MUST
BE BLED FROM THE LINES AND CYLINDERS.
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