Alfa Laval Toftejorg TZ-79, Инструкция по эксплуатации, Страница: 36 / 48

Maintenance and Repair
(continued)
Replacement of Main Collars
Although normally exposed to very limited wear, it is possible to replace Main collars (pos. 28.1 and
28.2) in Body. The procedure to do this is described below.
Warning : Replacement of Main collars involves risk of damaging the special threads and
accordingly the body. It is recommended to let an authorized Alfa Laval Tank Equipment
sales office do the replacement.
Main collar upper
1. Place Body (pos. 28) in a vice in upright position. Do not clamp on machined faces. Insert Tool
(see page 36) into Main collar upper (pos. 28.1). 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. Several times knock hard on tool 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.
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