JUKI LK-1900B series Engineer's Manual

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3. Standard adjustment value
(1) Main shaft connection/disconnection
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
Procedures of disassembling
1. Loosen the setscrew
❷
of the main shaft counterbalance
❶
through the screwdriver hole A, then re-
move the taper screw
❸
.
2. Loosen the two setscrews
❹
(through the screwdriver hole B), and also the two each of
❺
and
❻
.
 Atthattime,loosenthesecondsetscrewrst.Therstsetscrewshouldberemovedcompletelyfrom
theatpartofthemainshaft
❼
.
3. Remove the main shaft motor
❽
.
Refer to "3.-(3) Removal of the main shaft motor and coupling."
4. Loosen the two setscrews
󱢳
.
 Payattentiontopossibleinjuryatthattimebecausethebalancer
󱢴
begins to turn when the setscrew
󱢳
is loosened.
5. Loosen the two setscrews
󱢵
.
 Atthattime,therstsetscrewofthesetscrew
󱢵
shouldberemovedcompletelyfromtheatpartofthe
main shaft
❼
.
6. Loosen the two setscrews
󱢶
and the two setscrews
󱢷
.
7. Draw out the main shaft
❼
in the direction of the Arrow C.
Main shaft taper hole
Screwdriver hole B
Screwdriver hole A
No. 2 screw
No. 1 screw
No. 2 screw
No. 2 screw
No. 1 screw
No. 1 screw

JUKI LK-1900B series Specifications

General

Brand	JUKI
Model	LK-1900B series
Category	Sewing Machine
Language	English