Ingersoll-Rand MHP825WCAT, Operation & Maintenance Manual

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Maintenance Operation & Maintenance Manual
75
Speed and Pressure Regulation Adjustment
Normally, regulation requires no adjusting, but if correct adjustment is lost, proceed as follows:
Refer to the diagram above.
With the unit stopped, disconnect ballast spring ‘ A ’ from the butterfly lever. Loosen the two
screws securing bracket ‘ C ’ to main bracket ‘ J ’.
Loosen screw ‘ D ’ and rotate the butterfly valve pivot shaft ‘ K ’ fully clockwise until the valve is
closed. Position lever ‘ L ‘ approximately 10° after vertical and tighten screw ‘ D ’.
Keep the butterfly lever in the closed position and with the the air cylinder fully contracted
tighten the screws holding bracket ‘
C ’ to the main bracket ‘ J ’.
Allow the cylinder to return to its extended position and reconnect the ballast spring ‘ A ’.
IMPORTANT: Ensure all components are aligned and move freely.
Start engine: Note receiver pressure. Warm up pressure should be 3, 5–5, 0 bar (50–70 p.s.i.).
To increase the warm up pressure, turn the air cylinder rod in an anti–clockwise direction to
open the butterfly valve.
To reduce warm up pressure, turn air cylinder rod in clockwise direction to close butterfly
valve.
When the engine is warmed up, press the service air switch on the control panel to commence
normal regulation.
Set pressure by adjusting the screw ‘ E ’ on the pressure regulator ‘ F ’. Turn the screw clockwise
to increase pressure and anticlockwise to reduce pressure.
Rated Operating Pressure:
XHP700 300 psig
SHP750 300 psig