S-4000 LT
1-46
Revised 10/2004
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2 0 . T H E M A I N C A M C H A N G E
1.
Loosen the screws
➊
and remove the holder
➋
.
2.
Unscrew the screws
➌
and remove the right control
spring
➍
and the holder
➎
.
3.
Loosen the stud
➏
and remove the worm gear hub
and the main cam assembly
➐
. Dismantle the
assembly.
4.
Assemble the main cam assembly according to the
following steps:
a)
Install the washer
➒
on the barring cam
➑
.
The mounting hole
must be covered.
b)
Install the feed reversing cam
➓
by the same
way.
c)
Place the stop disc
on the feed reversing
cam
➓
and fix it using the screws
and
.
d)
Insert the springs
into the holes in the stop
disc and install the drive disc spring
. Lock it
using two screws
.
5.
Remove the spring
from the pin
.
6.
Using a grease, place the thrust washer
on a
bedplate.
7.
Install the main cam assembly
➐
and the worm gear
hub on the thrust washer. Lock it by stud
➏
.
8.
Install the spring
on the pin
.
9.
Install the holder
➎
,control spring
➍
and tighten the
screws
➌
.
10.
Install the holder
➋
and lock it by screws
➊
.
11.
Turn the hand wheel to check the clearance on the
main cam - see section E9, point 3.
12.
Switch the machine on and check if the machine stops
in the home position - see section E2, E9, point 1
13.
Check the shape of a bar - see E9, point 2.
14.
Sew a few buttonholes . The shape of a bar must be
as shown on picture below.
15.
If incorrect, tilt the machine head and move the left
shifter arm to the left to obtain correct shape of a bar
(the clearance between the control spring and the
shifter arm spring
must approximately be
1,2 - 1,5 mm)
E - MACHINE ADJUSTMENTS