Lubrication Of Modified Hook Driver When Removed From Machine - Bernina B 590 Service And Maintenance Manual

7.1. Lubrication of modified hook driver when removed from machine is not necessary at
the moment
General information:
The hook driver of the new 5 Series has been modified.
The modification improves process reliability considerably.
The driving part of the hook driver has been made of
synthetic material (new), (right part 1 in pict.).
Previously the driving part of the hook driver was made of
sinter material (left part 2 in pict)
The modified hook driver will replace the previous hook
driver type completely. It will be used in all machines with
BERNINA hooks.
Oiling/lubrication:
• Remove screws a, b, c, and d (T9).
• Remove hook driver cover (pict. 2).
• Use spring mounting tool 398112.03.0+ to remove
tension springs e and f. Remove hook drive shaft
(pict. 3).
Note:
New - the hook drive shaft consists of one piece now (pict
4).
Oil to be used:
Klübersynth UH1-1600 / OY 100 K
• Use Klübersynth UH1-1600 to lubricate link, link
block, and drive shaft sparingly.
• Fill OY 100 K in oil inlet (pict. 5).
Assembly:
• Refit hook drive shaft into hook driver driving part.
Use spring mounting tool 398112.03.0+ to rehook
tension springs in their proper positions (pict. 3)
• Refit hook driver cover.
• Refit black hook driver cover with white dot (see top
pict.)
• Retighten 4 fastening screws a, b, c, and d
crosswise. (pict. 6)
Note:
• Recheck if tensions springs are correctly hooked at both ends. (pict. 3 and 6)
• To avoid cutting a new thread, find the proper thread with the screws.
• Don't tighten the screws too tight to avoid stiff running of the drive shaft.
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