Section 5
MAINTENANCE
24
2. With the service valve closed, set the engine low
speed (idle) to its specified setting with the idle
stop screw on the engine injector pump.
NOTE
Operation at speeds below the minimum idle
speeds shown in Section 3 under Specifications
will damage the compressor. Extended operation
below those speeds will induce coupling and/or
compressor failures.
3. Adjust the pressure regulator so t hat t he com-
pressor maintains 117 psig (8.1 bar).
4. Gradually open the service valve to atmosphere
until the engine comes up in speed and sump
pressure is held at 100 psig (6.9 bar). At this
point, set the engine high speed to its specified
setting by adj usting the high idle threaded rod lo-
cated on the engine speed control. To raise or
lower the speed, lengthen or s horten the rod re-
spectively.
5. Open the service valve to 100 psig (6.9 bar) (rated
full load pressure) and recheck top engine
speed and control response. Close the s ervice
valve and allow the compressor to cycle and re-
check low engine speed (idle).
The following explanation applies to “H” compres-
sor with dual pressure controls.
1. Start the compressor and allow the engine to
warm---up to normal operating temperature with
the service valve closed and the pressure selec-
tor switch set to the “low” position.
2. Follow the procedure for setting the controls at
100 psig (6.9 bar) rated full load pressure as de-
scribed in Steps 2 through 5 a bove.
Figure 5 ---4 Control System Adjustment
175/185
185H
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