JUKI MOJ-2500N - User Manual

lYSi56'LWl No. 01
r
Thank you for buying the JUKI MOJ/MOK-2500N
BEFORE OPERATION
1. Do not hold the cloth plate cover when carrying the
machine.
2. Resupply oil if the red color in the oil gauge is not seen
when the oil gauge
is observed from the top or the side.
3. Apply a few drops of oil to the needle bar guide and
upper looper guide before operating your new rnach~ne or
starting your machine for the first time ~n a ioog time.
Also,
lubricate the oil holi: sf link (A) and ttre top feed
presser bar. (Refer ?o "2, LUBRiCATiUN".i
4. Never allow the sewing machine to sun in the reverse
directioi!. The hdndwhrei shrjr;ld rcirr. clockwise as
1
series sewing machine. The MOJIMOK-2500N series
I
models have basically the &me mechanism as
those of MOG-2500N series models except that the
top feed mechanism has been incorporated
in
MOJ/MOK-2500N series models. For this reason,
I
thl Instruction Manual mainly deals with the too
I
feed mechanism only.
he customers are re-
quested to refer to separate instruction Manuals of
MOG-2500N series models for the common instruc-
tions omitted from
this manual.
MOJ
1 (Example) For MOK - 25 16N
Top feed mechanism
I CAUTIONS IN OPERATION I
1. Do not put your hand under or near the needle when
turning the power switch
ON or while the machine is
operating.
2. Do not put your fingers into the face plate cover while the
machine
is operating.
3. Be sure to turn the power switch OFF when removing the
V belt.
4 Dor~ng operation, be careful not to allow your or any
other person's head or hands to come, or place anything
close to the pulley,
V belt or motor. Any of these actions
may develop dangerous conditions.
" if vour machine is provided with a belt cover, finger guard
CJT any other protectors, never operate your machine with
any of these removed.
F. Do not wlpe off the surface of the machine head using
racouer thinner.
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5 - 6.5 mm
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j 1 ~lr~.~~?~~,li::al \:rok\> <)t ::;~j ic, J ..its 3 ;I!;,;
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Max. 6 mm
1 Lift oi ;?ri.\cr f~o! Y i;rr, 8 mm
I * i
Zleans the ratio ,it !hi: rndi!l red 3oi.r i!:~:giru.lii?:~l .trok.r t,? the !op feed dog longitudinal stroke.
This ratio
is factory-
adjusted
to 1 :l .I -. 1 ::.8 for the blOJ-:( 136, a~id i :0.7 - ! : 1.8 for the MOJ-2516N.
("2) The top feed dog has 3 long end for betre: <titchine perforn:ance. When the maximum longitudinal stroke of 8.5 mm of the
top feed dug
is nece.;sar)~. out the end ot the top feed dog bl 3 mm by a maximum.
12. LUBRICATION
~p~ -~ - - -
Before operating a new machine or a machine which has
not been used for an extended period of time, apply a
few drops of lubricating oil to oil hole of link
(A)
0
(lubricate the bushing from the front knife driving arm
shaft) and top feed presser bar
@ .
MATPARTS

Summary

BEFORE OPERATION

CAUTIONS IN OPERATION

1. SPECIFICATIONS

3. PRESSER LIFTING CHAIN

4. PRESSER FOOT

5. CHANGING THE TOP FEED AMOUNT (HORIZONTAL STROKE)

6. ADJUSTING THE VERTICAL STROKE OF THE TOP FEED DOG

7. ADJUSTING THE TOP DIFFERENTIAL FEED RATIO

8. ADJUSTING THE HEIGHT OF THE TOP FEED DOG

9. PROHIBITED ADJUSTMENT

10. ADJUSTING THE PRESSURE OF THE TOP FEED DOG

11. CONVERSION BETWEEN MOJ-2500 N AND MOK-2500 N

1. INSTALLING THE FRAME SUPPORT PLATE

2. MOTOR PULLEY AND V BELT

3. ATTACHING THE BELT COVER

4. INSTALLING THE PEDALS

5. SETTING UP THE THREAD STAND

6. LUBRICATION

Checking and cleaning the oil pan

Periodically remove and clean oil pan and cloth filter. Replace oil if dirty.

Installing the needle cooler

Procedure for installing needle cooler support and lubrication joint.

Checking the cartridge filter and replacing it

Check and clean/replace cartridge filter regularly to prevent machine damage.

Lubricating the needle cooler

Fill needle cooler with silicone oil through designated points.

7. OPENING;CLOSING THE COVER

8. ATTACHING NEEDLES

9. THREADING THE MACHINE

10. THREAD TENSION

11. PRESSER FOOT PRESSURE AND LIFTER

12. ADJUSTING THE STITCH LENGTH

13. LOCKING MECHANISM OF FEED ECCENTRIC CAM

14. HEIGHT OF NEEDLE

15. SETTING THE LOOPERS

Lower looper

Adjust lower looper distance from overlock needle and between loopers.

Upper looper

Set upper looper height above throat plate and clearance with lower looper.

Double-chain looper

Adjust double-chain looper distance from needle and clearance with needle.

16. DIFFERENTIAL FEED MECHANISM

17. PRESSER FOOT AND FEED DOG

Contact of the presser foot with the throat plate top surface

Adjust presser foot to ensure even contact with the throat plate.

Height of feed dog

Adjust feed dog protrusion from throat plate for different materials.

Tilt of feed dog

Level the feed dog by adjusting the eccentric shaft.

20. KNIVES AND OVEREDGE WIDTH

Height of the lower knife

Adjust lower knife height to be flush with the throat plate surface.

Height of the upper knife

Adjust upper knife to overlap lower knife by 0.5-1 mm.

Overedge width

Change parts or models to adjust overedge width from 4.8 to 10 mm.

Resharpening the lower knife

Resharpen the lower knife when it becomes dull.

21. NEEDLE GUARD

For 1-Needle and 2-Needle Overlock Machines

Position needle guards for 1-needle and 2-needle machines.

For safety stitch machines

Position needle guards for safety stitch machines.

JUKI MOJ-2500N Specifications

General

Differential Feed	Yes
Differential Feed Ratio	0.7 - 2.0
Type	Overlock
Number of Threads	4
Number of Needles	2
Stitch Length	0.8 - 4 mm
Power Requirements	100 - 120 V