Heavy Duty Balanced Opposed Compressors

FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE
10. Re-install and adjust the chain according to the instructions in “Chain Adjustment”
on page 5-13.
11. Reinstall all tubing to the pump.
Sprocket
No. 204 Woodruff
(or Square Key)
Set Screws
Gaskets
Adapter
FIGURE 5-9: LUBE OIL PUMP AND SPROCKET - TYPICAL
Force Feed Lubricator Chain Sprocket Replacement
1. Refer to Figure 5-10: on page 5-17.
2. With a good machinist rule, measure the exact distance from the inside face of
the auxiliary end cover to the near face of the lubricator sprocket. Note the measurement
for proper positioning of the new sprocket. Remove chain.
3. Remove the sprocket set screw and sprocket. Detach all tubing to the lubricator.
4. Remove the four mounting bracket capscrews and remove the lubricator.
5. With the lubricator on the bench, remove the Woodruff Key from the shaft and
file the shaft to remove any burrs raised by the cup point of the set screw. Install
a new O-ring.
6. Install a new No. 204 Woodruff Key after first checking to make sure the key will
fit into the new sprocket. If it is too thick, it can be polished with an emery cloth
on a flat surface until it can easily slide into the notch. It may also be a little high
and require filing of the top edge.
7. After the new key has been installed and it has been determined that the new
sprocket will fit, oil the new O-ring and remount the lubricator to the end cover.
8. Put the new sprocket onto the shaft and set to measured dimension. Tighten the
set screw.
9. Check alignment to the crankshaft drive sprocket with crankshaft centered in
end play, using a straight edge, to within 1/32 inch (1mm).
10. Install chain and adjust using the instructions given in “Chain Adjustment” on
page 5-13.
PAGE 5 - 16 11/01
Pump