Maintenance
26
Replace the Oil
1. Operate the pump for ten minutes to warm the oil.
2. Turn the pump OFF.
3. Place a block under the front of the pump to tilt it toward the drain in the
back.
4. Unscrew one of the oil caps on the top of the pump.
5. Place a vessel under the drain and remove the drain plug.
6. Replace drain plug and fill the pump with oil as described in the Hardware
Description and Assembly section of the manual on page 4.
7. Replace oil caps and remove block before operating the pump.
Inspect and Clean the Inlet Filter
1. Disconnect the Vacuum Hose to Dewar U-Tube from the pump inlet port
(Figure 1).
2. Remove the filter and O-ring and inspect for cleanliness.
3. If needed, remove the O-ring from the filter and wash the filter with a
proper cleaning solution and allow it to dry. Do not let the O-ring come
into contact with the cleaning solution.
4. Re-assemble the filter, O-ring, and Vacuum Hose to Dewar U-Tube.
Inspect and Clean the Gas Ballast Control
1. Remove the oil ballast (Figure 1) from the top of the pump.
2. Wipe with a clean dry cloth and check that the air hole is not blocked.
3. Screw the oil ballast back into place.
Clean Oil Level Sight Glass
1. Drain the oil as described above.
