Instruction manual

5.5 Change the gearbox oil
1. Refer to Figure 4. Remove the oil filler-plug (4).
2. Place a suitable container under the oil drain-plug (5).
3. Remove the oil drain-plug (5) and allow the oil to drain out of the gearbox.
4. Refit the oil drain-plug (5).
5. Dispose of the old rubber bonded seal on the oil filler-plug (4) and replace it with a new one
from the pump maintenance kit.
6. Fill the gearbox through the filler-hole, with the correct grade and quantity of oil. Allow the
oil to drain into the gearbox and then check the level on the oil-level sight-glass: refer to
Section 5.3.
7. Ensure that the new rubber bonded seal is positioned correctly on the oil filler-plug (4), then
refit the plug to the gearbox.
5.6 Relubricate the rotor bearings
Relubricate the rotor bearings as described below.
1. Refer to Figure 11. Remove the six fixing-screws (2) which secure the bearing end-cover (1)
to the high vacuum head-plate.
2. Lift away the end-cover (1) and remove the sealing 'O' ring (3). Dispose of the 'O' ring (see
Section 6.2).
3. Use a plastic or wooden spatula to remove as much old grease as possible from the end-cover
and bearings (5). Do not use your fingers for this operation.
4. Inspect the bearings for obvious signs of wear or the presence of debris. If the bearings are
worn, return the pump to a BOC Edwards Service Centre for repair.
5. If the bearings are in a satisfactory condition, force new PFPE grease (supplied in the
maintenance kit) into the bearings so that a smooth layer of grease covers the case and
bearings. Do not over-pack the bearings or the DP180 will run hot.
6. If you have not fitted a pump to evacuate the bearing end-cover (see Section 3.10) and you
have reached the planned time to replace the head-plate felt filter (this is carried out
annually), replace the filter as described in Section 5.7. Otherwise, continue at Step 7 below.
7. Apply a light wipe of PFPE grease to the new 'O' ring seal (3) and position it in its groove in
the head-plate.
8. Refit the end-cover (1) to the high vacuum head-plate and secure with the six screws (2).
24 DP180 Dry Vacuum Pump