600H, 700HH, 750, 750H, 750HH, 825, 900H, 1050 USER MANUAL SECTION 5
86
CONTROL SYSTEM ADJUSTMENT—SINGLE PRESSURE
Refer to Figure 5-10. Prior to adjusting the control
system, it is necessary to determine the desired
operating pressure range as well as the maximum
pressure at which the machine is to operate. This
pressure must not exceed the maximum operating
pressure which is stamped on the machine serial
number plate.
1. Start the machine and let it warm-up and
enter full “run” mode.
2. Open service valve slightly until engine tries
to speed up. Slowly close the service valve.
With service valve closed, check and adjust
the pressure at the reducing regulator to a
minimum of 60 psig (4.1 bar) and not to
exceed 85 psig (5.2 bar). With service valve
still closed adjust the back pressure regula-
tor so the service pressure is between 115 to
125 psig (7.9 to 8.6 bar) for standard
machines, 165 to 175 psig (11.4 to 12.1 bar)
for "H" machines, and 190 to 200 psig (13.1
to 13.8 bar) for "HH" machines with the
engine at 1400 rpm. Open the service valve
to load the compressor to maintain a service
pressure of 100 psig (6.9 bar) for standard
machines, 150 psig (10.3 bar) for "H"
machines, and 175 psig (12.1 bar) for "HH"
machines. Operating speed should be 1800
RPM on the controller panel. If not, repeat
step, or adjust the unload service pressure
up or down as needed until desired pressure
is maintained and engine speed is 1800 rpm.
Figure 5-10: Control System Components
1. Pneumatic Inlet Valve
2. Compass Controller
3. HI/LO Solenoid (Dual Only)
4. High Pressure Regulator
5. Low Pressure Regulator (Dual Only)
6. START/RUN Solenoid
7. Reducing Pressure Regulator
8. Dry Pressure (P
1)
9. Wet Pressure (P
2)
10. Control Pressure (P
3)
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