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20 2006SSD-75 R4 (10/10)
Dual-Compressor Module Maintenance
RIGHT SIDE VIEW
4.5 Adding and Removing Oil
Oil is drained from the system through the Schrader valves on the Compressor suction ttings, rst-stage
oil separator and oil cooler (see Figure 15 on page 21).
4.5.1 Topping Off the Oil Level
See 4.4 - Oil Capacity and Type on page 19 before adding oil. Also refer to 4.2 - Maintenance Tools on
page 18 for information about the tools used in this procedure.
NOTE
Adding oil through the Schrader valve on either compressor suction tting permits adding the oil
with the compressor running.
Adding Oil
1. Turn the knob on the backseating control valve fully
counterclockwise.
2. Remove the protective cap from the Schrader valve
on either compressor suction tting and connect the
backseating control valve.
3. Connect one end of the oil transfer hose to the back-
seating control valve.
4. Connect the opposite end of the hose to the oil transfer
pump.
5. Pour PAO oil into a clean container and attach the
extension hose to the threaded neck of the container.
6. Turn the knob on the backseating control valve clockwise to open the Schrader valve and slowly open
the oil transfer hose ball valve.
CAUTION
When pressure is applied to the oil pump, the handle may extend rapidly.
7. Move the pump handle slowly using long, slow, full strokes on the pump handle to transfer oil into the
Compressor until the desired oil level is reached. One full pump stroke dispenses 1.6 oz. (47ml) of oil
(see 4.3 - Checking the Oil Level on page 19).
8. Turn the knob on the backseating control valve counterclockwise to close the Schrader valve and
remove the control valve.
9. Replace the protective cap on the Schrader valve.
10. Return the Compressor Package to service.
11. Check for leaks at all ttings that have been disturbed.