Positioning the toothed belt wheels
Service Manual 867 Version 02.0 - 04/2015 23
6 Positioning the toothed belt wheels
The two toothed belt wheels must be positioned one on top of the other
such that the toothed belt can run correctly. In machines with normal
lengths, the winder wheel is directly next to the upper toothed belt wheel
and determines its alignment. In long arm machines, the winder wheel is
fastened farther away in the center of the arm.
Order
• Always check the position of the other toothed belt wheel after making
a change on a toothed belt wheel.
Differences between long arm machines and machines with normal
lengths
long arm
machines
In long arm machines, the winder wheel on the driver wheel is aligned in
the center of the arm ( Winder, page 61) and is irrelevant for the toothed
belt wheels. Therefore, in long arm machines, it does not matter which
toothed belt wheel you check first.
Machines with
normal lengths
In machines with normal lengths, the position of the upper toothed belt
wheel is defined by the distance to the winder wheel.
Therefore, you must first align the upper toothed belt wheel on the winder
wheel and then align the lower toothed belt such that the toothed belt runs
correctly over both wheels.
6.1 Upper toothed belt wheel
Proper setting
The two setscrews for the upper toothed belt wheel are seated completely
on the surface.
Additional checks for machines with normal lengths
Machines with
normal lengths
The distance between the winder wheel and the upper toothed belt wheel
is 0.8 mm.
Cover
• Arm cover ( 3.3.2 Removing and fitting the arm cover, page 13)
WARNING
Risk of injury
Crushing injuries from moving parts.
Switch the sewing machine off before you check
and set the upper toothed belt wheel.
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