Gardner Denver EBB BB-7.5 HP Operating And Service Manual page 39

Oil Inlet Pressure – Check at the fitting in the line near
the compressor oil inlet. With air receiver pressure at
100 psi, oil inlet pressure should be 65–75 psig.
Oil Cooler Oil Pressure Differential (Air–Cooled
Radiator) – Check differential across the oil system by
measuring oil inlet pressure as described above.
Oil Cooler Temperature Differential (Air–Cooled
Radiator) – The oil temperature differential depends
on the temperature of the air at the oil cooler fan and
cleanliness of the core faces. As ambient tempera-
tures and core restrictions increase, the oil cooler outlet
temperature will increase. The oil inlet temperature is
approximately the same as the air discharge tempera-
ture – see the gauge on the instrument panel. The out-
let oil temperature may be checked by installing a tee
at the oil filter outlet.
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