F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-57
Lube Oil Pump & Lube Oil Pressure
F
IGURE
4-24 L
UBE
O
IL
P
UMP
- T
YPICAL
Description & Adjustment
If there is a separate regulating valve down stream from the pump, the spring-loaded safety
relief valve within the pump head is set at the Ariel factory on a new compressor to the max-
imum pressure with the adjusting screw turned in all the way. Even though the adjusting
screw is turned in all the way, the relief valve will still open at approximately 100 psig (7 bar
g
)
to protect the pump from high pressure damage. In this case, do not adjust the pump safety-
relief valve unless installing a new pump, then set the relief valve to maximum pressure by
turning the adjusting screw clockwise in all the way.
If there is no separate regulating valve, the pump safety relief valve is set by the Ariel factory
on a new compressor to regulate pressure at 60 psig (4.1 bar
g
) into the compressor when
crankshaft speed equals or exceeds minimum normal operating speed. If oil pressure into the
compressor while running at minimum operating speed and normal operating temperature
does not read approximately 60 psig (4.1 bar
g
), adjust the pump safety relief valve. With com-
pressor running at minimum rated speed, remove the dust cap and adjust the screw to pro-
vide oil pressure into the compressor at 60 psig (4.1 bar
g
). Turning the adjustment screw
clockwise increases the pressure setting.
Lube Oil Pressure Regulating Valve
If there is a separate lube oil pressure regulating valve, normal oil pressure into the compres-
sor is set at the regulating valve by the factory at 60 psig (4.1 bar
g
) when crankshaft speed
equals or exceeds minimum normal operating speed.
NOTE: IF OIL PRESSURE DROPS BELOW 50 PSIG (3.5 bar
g
) WHEN CRANKSHAFT
SPEED EQUALS OR EXCEEDS MINIMUM RATED OPERATING SPEED, THE
CAUSE MUST BE FOUND AND CORRECTED.
Suction
Discharge
Remove Dust Cap to Expose Safety Relief
Valve Adjusting Screw (Turning Screw
Clockwise Increases Pressure Setting)
Smaller Compressor
Models Have Threaded
Connections