Operating & Maintenance Manual OPERATION
38 Book: 46551819 (2-11-2011) Rev B
C185 Speed and Pressure Regulator Adjusting Instructions
Before Starting
1. On the Pressure Regulator, loosen the jam nut and turn screw counterclockwise until
tension is no longer felt at the screw. Then, turn screw clockwise one full turn.
2. Close service valve(s).
3. Inspect throttle arm (G) on engine governor to see the arm is resting against the governor
stop. Loosen jam nut on air actuating cylinder (A) and then turn cylinder rod (D) until
throttle arm (G) is forced against the governor stop.
After Starting Unit
4. If equipped, push the SERVICE AIR button on the control panel, making certain the button
does not pop back out. The unit should speed up and then unload (and drop back to IDLE).
With the unit unloaded, turn the adjusting screw on the pressure regulator clockwise until
the discharge pressure gauge indicates 125-130 psi.Tighten the pressure regulator jam
nut.
5. With the service valve closed, adjust IDLE speed (*). Adjust speed using adjusting rod (D).
Tighten jam nut (H).
6. Open the service valve and adjust the discharge pressure to 100 psi (700 kPa). Now
turn adjusting rod (C) until the proper engine FULL speed setting (*) is reached.
Tighten jam nuts (B & J).
7. To obtain maximum CFM at any pressure between 80 psi (550kPa) and maximum
pressure rating (*), make adjustment at the pressure regulator to obtain desired
discharge pressure at FULL engine speed. Lock adjusting screw and replace cover.
* See General Data Specifications.
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