MNL-126509
April 4, 2013
Page 17
3.1.4
Compressor Lubrication
3.1.4.1
Description
Refer to Figure 3-3. The compressor is provided with forced-feed lubrication. The oil pressure is pro-
duced by a low speed gear pump (1). The oil pressure is approximately 73 psi (5 bar).
The oil pump (1) is coupled to and driven by the crankshaft. It pumps oil through the oil line filter (2) and
a minimum pressure valve (3) to the 3rd stage cylinder. The oil is then distributed by the guide piston (4)
of the 3rd stage and lubricates all the moving parts of the compressor block.
The minimum pressure valve (3) allows for oil pressure indication at a pressure gauge and/or electronic
oil pressure monitoring.
3.1.4.2
Oil Level Check
Check the oil level at the sight gauge on either side of the compressor block (See Figure 3-4) every day
before putting the compressor into operation. Oil level must be between the minimum and maximum
notches. Oil level must never be below the minimum mark as this will cause severe damage due to lack of
Figure 3-3
Lubrication Oil Circuit
1. Oil Pump
2. Oil Filter
3. Minimum Pressure Valve
4. Guide Piston
5. Oil Sight Glass
^
CAUTION
The Oil Pump operates only when the compressor is rotating in the correct direction. If the compressor is
rotating backwards, no oil pressure will build up damaging the compressor.
3
2
4
1
5
5
