Troubleshooting 153
Pump
The hydraulic pump is operated by pressing the PUMP switch 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 P
UMP switch is turned on, it may be related to a voltage supply
problem in the pump circuitry. Contact your LabriePlus service technician for instructions on how to
solve this problem.
NOTE: Neither the engine throttle nor the transmission not being in Neutral will affect pump
operation once the pump is engaged.
Pump Cavitation
Cavitation is defined as the formation of air pockets in a moving fluid. Air in the hydraulic oil causes
excessive wear and noise. Make sure to prime the pump properly after replacement or after flushing
the hydraulic system (refer to “Priming a New Pump” on page 104). When the pump is properly
primed, cavitation disappears after a short period of time because air is returning to the hydraulic
tank.
If the pump is still generating unusual noise after performing the pump priming procedure, then you
will have to bleed the hydraulic system.
To do so:
1. Apply all safety measures to ensure safety around the vehicle at all times.
2. Connect a 0–4000 PSI gauge to the main valve to ensure that no pressure has built up in the
system.
3. Apply the parking brake and start the engine.
4. Engage the hydraulic pump (PUMP (PTO) switch “ON”).
5. Place a pan or a bucket under the plug located on the output section of the main control valve and
slowly loosen the plug.
A mixture of oil and air will come out. Keep bleeding the oil until the pump noise stops.
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