Alfa Laval Toftejorg TZ-79, Instruction Manual, Page: 28 / 48

Maintenance and Repair
(continued)
Stem Subassembly
Disassembly
1. Place machine in upright position.
2. Unscrew Gland (pos. 5). Note: Left-hand thread. Push out Main bush (pos. 6).
3. Turn machine upside down.
4. Remove Screws (pos. 10) in Gear wheel (pos. 8). To prevent rotation of Stem (pos. 3) mount two
screws in two holes opposite one another in BIG end of Stem. Place Stem in a vice held by the
heads of the two screws.
5. Draw out Gear wheel with ball race (pos. 8) and Ball retainer with balls (pos. 27).
6. Push out Stem (pos. 3).
If Ball races in Body (pos. 28.3) and on Gear wheel (pos. 8.1) are extremely worn they should be
replaced together with Ball retainer with balls (pos. 27). How to replace Ball races see page 32.
If blue liners on Stem are extremely worn, they can be replaced. This part requires that a precise
procedure is followed to accomplish installation. It is highly recommended that an authorized Alfa Laval
Tank Equipment Service Center perform the replacement when necessary.
Reassembly
1. Push Stem into Body. Turn machine upside-down.
2. Place Ball retainer with balls (pos. 27) and Gear wheel (pos. 8) into Body on Ball race. Rotate
Gear wheel to check free rotation.
3. Mount Gear wheel (pos. 8) with Screws (pos. 10) and tighten crosswise. To prevent rotation of
Stem (pos. 3) mount two screws in two holes opposite one another in BIG end of Stem. Place
Stem in a vice held by the heads of the two screws.
4. Turn machine to upright position. Remount Main bush (pos. 6) in Gland (pos. 5) and screw into
Stem (pos. 3). Note: Left-hand thread.
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