Troubleshooting 337
Pump
The pump is operated by a button switch located on the control panel. When it is engaged, the switch
turns green.
Three conditions must be met for the pump to engage and the switch to turn green:
Air pressure must be at approximately 70 PSI
Engine speed must be lower than 900 RPM
Emergency S
TOP button (red) must be pulled out
Air pressure condition is verified by a pressure switch, and engine speed, by the transmission control
module (TCM).
If the pump does not engage when the pump switch is turned on, it may be related to a voltage supply
problem in the pump circuitry.
The following test will help resolve pump-related problems. Prior to the test, ensure that all these
conditions are met:
Parking brake applied
Engine is running (idle speed)
Arm does not respond to
joystick (assuming that the
pump switch is ON)
Cut off or defective power
cables
Follow wires on the electrical
schematic for 12-volt supply (move
joystick to get signal).
Faulty joystick Contact LabriePlus.
Packer moves forward but
stops at end of stroke
Packer wear pads are worn out Replace wear pads (see Upper Wear
Pads on page 135).
Packer extend proximity switch
needs adjustment
Adjust packer extend proximity
switch.
Packing is insufficient Low hydraulic pressure Adjust hydraulic pressure. Call
LabriePlus for support.
Packer proximity switches are
not properly set up
Verify and adjust packer proximity
switches (see Adjusting Packer
Extend Proximity Switch on page 202
and Adjusting Packer Retract
Proximity Switch on page 205).
Loss of pressure due to leak
inside cylinder
Perform a cylinder leak test (see
Detecting Cylinder Internal Leaks on
page 285).
Optional regeneration valve
malfunctioning
Inspect regen valve and/or adjust
pressure (see Adjusting Regeneration
Valve Pressure on page 298).
Problem Possible causes Solution
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