FOR MODELS: JGW, JGR AND JGJ SECTION 4 - LUBRICATION AND VENTING
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Lube Oil Pump & Lube Oil Pressure
Description & Adjustment
Oil pump discharge pressure is held nearly constant by a spring loaded regulating valve
within the pump head. Lube system pressure can be raised or lowered by adjusting this
valve (see Figure 4-11:).
Lube Oil Pressure
NOTE: NORMAL PRESSURE ON THE DISCHARGE SIDE OF THE LUBE OIL FILTER IS
SET AT THE FACTORY AT 60 PSI (414 kPa) WHEN CRANKSHAFT SPEED
EQUALS OR EXCEEDS 600 RPM FOR THE JGW AND JGR AND 900 RPM FOR
JGJ. IF OIL PRESSURE DROPS BELOW 50 PSI (350 kPa), THE CAUSE MUST
BE FOUND AND CORRECTED.
Low Oil Pressure Shutdown
The low oil pressure shutdown is normally mounted by the packager and is supplied to cus-
tomer specifications. Ariel provides an oil pressure pickup fitting on the oil gallery located
after the cooler and filter. The electric or pneumatic oil pressure switch is to be set to actuate
when oil pressure falls below 35 PSIG (240 kPa).
NOTE:
1. THE COMPRESSOR MUST HAVE A WORKING LOW OIL PRESSURE SHUT-
DOWN.
FIGURE 4-11: LUBE OIL PUMP
Cap Shown
Removed
Adjustment Bolt
(Turn Clockwise to
Increase Pressure)
Locknut
Suction
Discharge
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