Chemglass AF-0349 Welch Vacuum Pump - Manual (Page 22)

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11. REPLACE THE LIP SEAL HOUSING
a) It is recommended that you use 3 lockwashers to secure the LIP SEAL HOUSING. Uniform tightness is
important. Repeatedly finger-tight the 3 screws in sequence. Then lastly, turn them very tight.
b) Replace the Woodruff Key in its slot. Use your small finger or a thin tool to hold it in place as you replace
the motor coupling housing. Be sure the key stays in position. If it should fall even a little distance, use a
screwdriver to push it back up in the key slot. Then tighten the set key screw—very tight.
Figure 6.1
12. REPLACE OTHER COMPONENTS, then reassemble the motor and other components.