JUKI LK-1900A Series User Manual

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3. Standard adjustment
(1) Main shaft connection/disconnection
Procedures of disassembling
1. Loosen the set screw of the main shaft counterbalance through the screwdriver hole A, then remove
the taper screw .
2. Loosen the two set screws
(through the screwdriver hole B), and also the two each of and .
At that time, loosen the second set screw first. The first set screw should be removed completely from the
flat part of the main shaft
.
3. Remove the main shaft motor .
Refer to “(2) Removal of the main shaft motor and coupling.”
4. Loosen the two set screws .
Pay attention to possible injury at that time because the balancer begins to turn when the set screw
is loosened.
5. Loosen the two set screws .
At that time, the first set screw of the set screw should be removed completely from the flat part of the
main shaft .
6. Loosen the two set screws and the two set screws .
7. Draw out the main shaft in the direction of the Arrow C.
F
D
E
No. 2 screw
No. 1 screw
No. 1 screw
No. 2 screw
No. 2 screw
No. 1 screw
C
Main shaft taper hole
Screwdriver hole B
Screwdriver hole A

JUKI LK-1900A Series Specifications

General

Stitch Type	Lockstitch
Max Sewing Speed	3, 000 sti/min
Power Consumption	550W
Needle Bar Stroke	41.2 mm
Needle Type	DP×5
Number of Patterns	50 standard patterns
Sewing Area	30mm x 40mm
Lubrication	Automatic lubrication
Presser Foot Lift	17mm (max)