13-10-617 Page 63
7. Remove screws holding the top plate to the oil reservoir. Lift the top plate from the oil reservoir.
8. Lift the separator from the separator housing.
9. Inspect and/or replace the separator as necessary. Before installing (or reinstalling) any
separator flanges are not damaged. Remove the gasket material adhering to the top plate or
reservoir flange from the old separator.
10. Lower the separator into the oil reservoir.
11. Seat the top plate to the oil reservoir flange; install and tighten all cap screws.
12. Reconnect the discharge manifold pipe union and all tubing.
13. Install original oil return by slipping tube through the fitting at the discharge manifold flange until
ferrule bottoms in the fitting. If a new fitting a return tube are used, slip the tube through the
fitting until it touches the bottom of the separator, then raise the tube about ¼ inch off the
bottom and tighten the fitting nut securely. Connect the other end of the tube to the compressor
oil return tube elbow. Do not bend tube or raise tube further than ¼” – ½” from the bottom of
the separator.
14. Reconnect compressor oil return tube to tube elbow.
COMPRESSOR OIL SYSTEM CHECK - The following readings are based on ambient temperature of
80° F (27° C) for air-cooled oil cooler and 80° F (27° C) inlet water on water-cooled oil cooler, with the
system in good condition. Compressor should be at operating temperature at the time of checks. One-
half hour of loaded operation is usually sufficient to reach level-out operating temperatures.
Air and Oil Discharge Temperature - 165° F to 195° F (74° C to 91° C) - Read display on the controller
or check with a thermometer at the discharge housing.
Compressor Oil Inlet Temperature - 150° F to 160° F (66° C to 71° C) - Install a tee at the oil filter outlet
and check with a thermometer.
Oil Inlet Pressure - Check at the fitting in the line near the compressor oil inlet. With air receiver
pressure at 100 psi (6.9 bar), oil inlet pressure should be 55 psig to 60 psig (3.8 bar to 4.1 bar).
Oil Cooler Oil Pressure Differential (Air-Cooled Radiator) - Check differential across oil system by
measuring oil inlet pressure as described above.
Oil Cooler Oil Pressure Differential (Water-Cooled Heat Exchanger) – 2 psid to 25 psid (.1 bar to 1.7
bar) (65 psig to 150 psig, 4.5 bar to 10.3 bar receiver pressure) - Check that oil inlet pressure is correct or
measure the differential between drains on the oil cooler shell.
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