3
GB
1.
General
These service instructions describe the adjustments that can be made
to the Class 838 special sewing machine.
CAUTION!
The operations described in these service instructions may only be
carried out by qualified staff or other appropriately trained persons!
Caution: Risk of Injury!
Turn the main switch off for repair, conversion and maintenance work
and separate the machine from the pneumatic supply line.
Any adjustment work and functional testing with the machine running
should be conducted only under observance of all safety measures
and with the greatest possible caution.
These service instructions describe the adjustment of the sewing
machine in a logical order. Please observe that various setting
positions are dependent on each other. Thus it is essential that the
settings be conducted while keeping to the order described.
For all adjustments of parts involved in the stitch formation, a new
undamaged needle must be inserted.
This text does not specifically mention any machine covers or panels
which must be removed or re-mounted in order to conduct inspections
or adjustments.
Note
Some shafts on the special 838 machine are provided with flat
eccentric surfaces. This significantly simplifies machine adjustments.
For all adjustments on flat surfaces, the first screw screwed in the
direction of the eccentric surface.
1.1
Setting gauges
The retention pin required for adjusting the machine in included with all
units. It is located with the machine accessories and can be attached
so that it is easily accessible below the oil tray.
