Machine head
Service Instructions 745-35-10 S/745-35-10 A - 02.0 - 04/2017 23
9. Replace and re-engage the hood (6).
3.7 Assembling the crank pin at the arm shaft
The distance between the eccentric crank pin to the arm shaft determines
the extent of the needle bar stroke and, thus, the top dead center of the
needle bars (mandated by the design of the machine).
The crank pin has been set precisely by the manufacturer. It needs to be
re-adjusted after the thread lever has been replaced or if the needles no
longer switch off properly.
Important
The crank pin is re-adjusted with the help of a gage (part number
0246 002591). The adjustment does not require that crank and arm
shaft be removed.
WARNING
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Do not adjust the crank pin unless the main switch
is switched off.
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