Product Manual

MASTERLINE SERIES CAP200
Page 32 of 46 REV H JUNE 2017
Oil Pressure
Large Industrials (C200 and up)
Base mounted large industrial units are equipped with a factory installed oil pump and oil
pressure gauge. Proper oil pressure readings are as follows
Oil Gauge Pressure
Normal Pressure .......................... 26 to 30 PSIG
Normal Pressure (C260H) ........... 30 to 40 PSIG
Minimum Pressure ....................... 20 PSIG
Switch Cutoff Pressure ................ 18 PSIG
Oil Switch
The oil pressure safety switch is set and tested at the factory for 18 pounds minimum oil
pressure. If the oil pressure is below the set pressure, the safety switch will cause the power
to shut off. After correcting the problem, power can be restored by the following procedure:
1. Push reset button on the pressure switch.
2. Push start button on starter.
Oil Pressure Procedure
Stop compressor and turn off power, then drain oil from crankcase. When facing flywheel,
remove the right hand side door from crankcase to expose closure screw in bearing plate No.
CM-836.
Remove closure screw –
No. CM-843 for models 200, 260, and 260H
No. CM-924 for models 300 and 300H
Follow the above instructions to expose closure screw.
Note: 1/2” dia. Hex hollow head adjusting setscrew with lock nut in the closure screw, see
drawing LH-32.
To adjust oil pressure
1. Adjust with ¼” Allen Wrench
2. To increase pressure – turn set screw to the right (tighten).
3. To lower pressure – turn set screw to the left (loosen).
Note – under normal conditions one full turn of the set screw will change the oil pressure
approximately 4 pounds.
Hold set screw position and tighten lock nut. Return side door, restore oil level in crankcase
(check oil level) and start compressor. “Note Oil Pressure Gauge” if normal pressure 36 to 40
pounds is not obtained by the above procedure contact factory service department.