MTS Model 506-62-72 Hydraulic Power Supply - Manual (Page 24)

3-12 Service
3 . 2 . 4 Main Pump Low-Inlet Pressure Switch Adjustment
VW-G052
Adjustment knob
Pressure Switch
(cover removed)
Indicator
Figure 3-2 shows the location of the main pump low-inlet-pressure
switch on the HPS. The switch monitors the pressure level supplied by
the supercharge pump at the input to the main pump. The switch
protects the main pump by turning off the HPS if the supercharge pump
pressure drops below the minimum level required by the main pump.
The switch is set at the factory to activate at 15 psi (0.1 MPa). This
switch may be adjusted with or without the HPS running. Use the
following procedure to adjust the switch.
1. Remove the four screws holding the cover and check the position of
the indicator.
2. If the indicator does not point to approximately 15 psi (0.1 MPa),
turn the adjustment knob located on top of the switch to increase or
decrease the pressure setting to 15 psi (0.1 MPa).
3. Re-install the cover and four screws.