Happy HCS-1201-30, Maintenance Manual

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Exchange of crank
3-2-1
17. Remove crank ass’y.
18. Put parts once removed back in reverse order
For adjusting fixing of each unit, please refer to process
to adjust fixing of each unit.
<Important> Pay attention to following (1) - (4).
(1)Please fix upper shaft collar, upper pulley, drive pulley
on flat surface of upper shaft with screw tightly.
(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.
19. Please check and adjust timing mentioned below to finish.
(1)Upper shaft timing (L point, C point)
(2)Take-up lever timing
(3)Rotary hook timing
(4)Thread cut timing