Happy HCS-1201-30, Maintenance Manual

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Exchange of motor belt
3-8-4
7. Remove drive pulley and motor belt.
Install good motor belt.
8. Install each parts in reverse order.
For installation and adjustment of each part,
please refer to respective manuals.
Referring to [3-8-3 Adjustment of motor belt tension],
adjust tensile strength of motor belt.
<Important> Pay attention to following (1) - (4).
(1)When you install upper shaft collar, upper pulley,
drive pulley and crank, please fix them on flat surface
of upper shaft with screw.
(2)Make sure that pulleys and collars are attached without
space from machine body except upper pulley.
(3)Position of upper pulley is [ 2mm ] from upper shaft collar.
Upper pulley positioning gauge [ 2mm ]
(4)Confirm that belt is not interfere the pulley flange and
not come out from pulley groove.
Adjustment will be done with following pulley.
Timing belt has to be adjusted with [upper pulley position].
Motor belt has to be adjusted with [motor pulley position].
9. Check and adjust following timing to finish.
(1)Upper shaft timing(L point, C point).
(2)Take-up lever timing.
(3)Rotary hook timing.
(4)Thread cut timing.