Chapter 4 Angular Measurements
Angular Position Measurements
Measurements Reference Guide 4-69
Replacing the clutch washer
1 If necessary, perform the disassembly procedure above.
2 Carefully separate the washer from the bottom of the clutch control shaft.
The washer is held in place by an adhesive on one side.
3 Remove the washer from the shaft. Since you should not be reusing this
washer, you can cut it to make removal easier.
4 Note that the replacement washer has a protective paper layer on one
side. (This washer is Agilent part number 55290-80001, which is part of
the 55290-67001 Replace Hardware kit.) This paper is intended to help
keep the washer’s adhesive sticky until the end of the installation
procedure. The paper has radial cuts to allow it to expand as needed
during the installation. Do not remove the protective paper until
instructed to do so.
5 Carefully slide the clutch washer, paper-covered adhesive-side first, onto
and along the clutch control shaft, until it reaches the non-threaded
portion just above the end of the shaft.
6 Remove the protective paper, being careful to minimize the amount of
handling, to keep from contaminating the adhesive with your fingerprints.
Then press the washer onto the base of the shaft.
7 If you think it necessary, perform the cleaning procedure above, to remove
fingerprints from the newly installed washer.
8 Replace the clutch control shaft in the retainer ring and re-attach the
retainer ring to the fixture’s top plate. Only slight pressure is required to
overcome the pressure of the clutch spring that tends to push the ring and
plate apart.
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