SECTION 3 – MAINTENANCE 3-11
Bob Assembly
Replacement of Bob Shaft Bearings
1. The bob shaft runs in two glass journal bearings. One is located at each end of the
bob shaft. Carefully remove the measurement head.
Note: The measurement head has an O-ring seal and will be tight during removal.
2. Remove the bob assembly by unthreading the plastic retaining nut.
3. Pull the bob assembly out of the measurement head. The bob assembly is held
magnetically.
Caution: Do not place the bob assembly near magnetic materials because of the
strong magnets.
4. Loosen the set screw on the bob and remove the bob from the shaft. Slide the retainer
off the shaft.
5. Remove the threaded ring and push the glass bearing out of the retainer.
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