Maintenance
59
4. Unscrew the wing nuts (
2
) and (
3
) on the bottom furnace lock (
3
):
Fig. 21: Wing nuts on the bottom furnace lock
5. Pull the bottom furnace lock (
1
) down and off.
The O-ring on the underneath of the furnace is now accessible:
Fig. 22: O-ring on the bottom furnace lock
6. Remove the O-ring (
4
).
7. Apply a thin layer high vacuum silicon grease (Part No. 92610) to the inside of the new O-
ring (Part No. 70380).
8. Insert the new O-ring on the underneath of the furnace on the combustion tube.
2
3
1
4
