Ingersoll-Rand P250WJDU, Operating & Maintenance Manual

Page: 35 / 57

Operation Operating & Maintenance Manual
Book: 22904767 (6/06) Rev. A 37
P250 Speed and Pressure Regulator Adjusting Instructions
The engine idle and full speed settings are
set and sealed at the factory, and should not
be adjusted. Serious injury may result if the
full speed is increased. Removal of the seals
without authorization could affect the
warranty. If speed settings are lost due to
engine fuel pump service or other repairs, the
speed settings can be reset as follows:
Before Starting
1. At the Pressure Regulator (on service
pipe near receiver tank), remove the
cover to expose the adjusting screw.
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. At air cylinder (A), loosen jam nut (B) on
adjusting rod (C). Turn rod (C) until it just
touches the piston inside of the cylinder.
This is determined by the movement of
the air cylinder piston rod (D). Rod (D)
should be fully retracted and just begin to
extend when the adjusting rod (C) is
properly set.
4. Lock jam nut (B).
After Starting Unit
5. Allow unit to warm up at an engine speed
greater than IDLE speed (*) for at least
five minutes. Do this by loosening jam nut
(H) on the IDLE screw (L). Turn the IDLE
screw until the speed is properly set (*).
6. If equipped, place the Start-Run Valve
Switch to the “AIR” position. 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. Replace cover.
7. 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.
8. If necessary, loosen jam nut (J) on FULL
speed screw (K) and turn screw until it
hits a stop. Recheck the FULL speed
setting and reset if required. Tighten jam
nuts (J) and (H).
9. Close the service valve and recheck
IDLE speed (*). If necessary, adjust