6 Maintenance
TZ-67
6.10
Replacement of main collars
Although normally exposed to very limited wear, it is possible to replace Main collars (26.1 and 26.2) in Body. The procedure to
do this is described below.
Main collar upper
1. Place Body (26) in a vice upright position. Do not clamp on machined faces. Insert tool (see page 43) into Main collar
upper (26.1). Unscrew Main collar.
2. Carefully clean thread and recess in Body. Do not damage special thread in Body. Recess must be absolutely clean.
3. Make sure that new Main collar is clean and free from impurities.
4. Screw in new Main collar. Attention should be given to make sure that thread is in correct engagement before screwing
in Main collar.
5. Tighten Main collar fully home and tighten up.
6. Check that Main collar is fully home: install Stem, Ball retainer with balls and Gear wheel (see page 26). Check that there is
sufficient axial clearance to allow for free rotation of Stem.
Main collar lower
1. Place Body in a vice in upside down position and repeat procedure described above.
Warning:
Thread on Main collar lower is left-handed.
Replacement of Main Collars
4106-0061_1
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