JANOME MyLock 634D Servicing Manual

MyLock 634D
JANOME
Brand
JANOME
Model
MyLock 634D
Category
Sewing machines
Type
Servicing Manual

JANOME MyLock 634D is a versatile overlock sewing machine that allows you to create professional-looking seams with ease. With its 4-thread overlock stitch, it can handle a variety of fabrics, from lightweight knits to heavy-duty denim. The machine also features differential feed for perfect seam control, and a built-in rolled hem for a clean finish.

JANOME MyLock 634D is a versatile overlock sewing machine that allows you to create professional-looking seams with ease. With its 4-thread overlock stitch, it can handle a variety of fabrics, from lightweight knits to heavy-duty denim. The machine also features differential feed for perfect seam control, and a built-in rolled hem for a clean finish.

SERVICING
MANUAL
MODEL 634D
INDEX
TO CHANGE
FACE PLATE UNIT ............................................................................................................1
TOP COVER UNIT ............................................................................................................ 2
BELT COVER UNIT ........................................................................................................... 3
TENSION COVER UNIT .................................................................................................... 4
FRONT PANEL UNIT .........................................................................................................5
SIDE COVER UNIT ...........................................................................................................6
MACHINE BASE.................................................................................................................7
MACHINE SOCKET........................................................................................................... 8
TO ADJUST
NEEDLE BAR HEIGHT......................................................................................................9
PRESSER BAR HEIGHT................................................................................................. 10
FEED DOG HEIGHT ....................................................................................................... 11
TIMING OF NEEDLE AND FEED DOG ........................................................................... 12
TENSION OF SUB THREAD TENSION DIAL ................................................................. 13
NEEDLE AND THE UPPER KNIFE TIMING ....................................................................14
STITCH LENGTH............................................................................................................. 15
CLEARANCE BETWEEN NEEDLE AND LOWER LOOPER / NEEDLE GUARDS ......16
CLEARANCE BETWEEN NEEDLE•@AND FIXED NEEDLE GUARD ............................ 17
POSITION OF CHAINING FINGER ..................................................................................18
NEEDLE AND THE LOWER LOOPER TIMING .............................................................. 19
POSITION OF UPPER LOOPER....................................................................................20
UPPER & LOWER LOOPER TIMING ............................................................................. 21
CLEARANCE BETWEEN LOOPERS.............................................................................22
CLEARANCE BETWEEN NEEDLE•@AND UPPER LOOPER.......................................23
POSITION OF KNIVES.................................................................................................... 24
POSITION OF LOWER LOOPER THREAD GUIDE ...................................................... 25
THREAD TENTION DIAL................................................................................................. 26
TO CHANGE THE TOP COVER UNIT
To remove:
1. Loosen two screws (A) through hole of tension thread guide plate (B), and remove the top
cover (C).
To attach:
2. Put the ribs (D) in tension cover unit (E), and tighten the setscrews (A).
1
TO CHANGE THE BELT COVER UNIT
To remove:
1.Open the looper cover unit (A).
2.Loosen set screw (B) and remove the setscrew (C).
3.Remove the belt cover unit (D).
To attach:
4.Put the ribs (E & F) in front panel unit (G) and tension cover unit (H), and tighten setscrews (B
& C).
2
TO CHANGE THE TENSION COVER UNIT
To remove:
1. Remove face plate unit and belt cover unit.
2. Remove setscrews (A & B), and remove tension cover unit (C).
To attach:
3. Put rib (D) in front panel unit (E), and tighten the setscrews (A & B).
4. Attached the belt cover unit and face plate unit.
3
TO CHANGE THE FRONT PANEL UNIT
To remove:
1. Remove the face plate unit, belt cover unit and tension cover unit.
2. Move the upper looper (F) to its lowest position by turning the balance wheel in counterclock-
wise.
3. Remove set screws (A, B, C, D & E), and remove the front panel unit (G).
To attach:
4. Attach the front panel unit (G), and tighten setscrews (A, B, C, D & E).
To set the thread take-up lever position, the thread take-up lever (H) and the thread take-up
lever cover (I) should be set at F position as shown below.
5. Attach the tension cover unit, belt cover unit and face plate unit.
4
TO CHANGE THE SIDE COVER UNIT
To remove:
1. Loosen setscrew (A) and remove the side cover unit (B).
To attach:
2. Fit the U-groove (C) in the side cover unit (B) between the setscrew (A) and set plate (D).
3. Tighten the setscrew (A).
5
TO CHANGE THE MACHINE BASE
To remove:
1.Remove the screws (A, B, C, D & two hinge screws E), and remove the base cushions (F).
2.Remove the machine base (G).
To attach:
3.Attach the machine base (G), and tighten the screws (A, B, C & D).
4.Attach the base cushions (F), washers (H, I & J), and tighten the hinge screws (E).
(Do not cross the washers because the sizes are different.)
6
TO CHANGE THE MACHINE SOCKET
To remove:
1.Remove the belt cover.
2.Remove the two setscrews (G), and pull out the cord connectors (A, B, C & D).
To attach:
3.Insert the cord connectors (A, B, C & D) as shown below.
Connectors:
A: Blue for motor
B: Brown for motor
C: Brown for lamp socket
D: Blue for lamp socket
4.Attach the machine socket (F), and tighten the two screws (G).
5.Attach the belt cover unit.
7
TO ADJUST THE NEEDLE BAR HEIGHT
The distance between the tip of needle on the right and the surface of needle plate (B) should be
between 11.2 and 11 .6 mm when the needle bar (C) is at the highest position.
To adjust:
1. Remove the face plate unit.
2. Turn the balance wheel toward you with your hand, and set the needle bar (C) at the highest
position.
3. Loosen the setscrew (A) to adjust the height, and tighten, the setscrew (A) after the adjust-
ment is done.
4. Turn the balance wheel toward you one cycle, and recheck the needle bar height.
5. Attach the face plate unit.
8
TO ADJUST THE PRESSER BAR HEIGHT
The distance between the surface of needle plate (C) and bottom of presser foot should be
between 4.7 and 5.3 mm (47/254 and 53/254”) when the presser bar lifter (D) is raised.
To adjust:
1. Remove the face plate unit.
2. Remove the set screws (A) to move the lamp socket unit (E).
3. Raise the presser bar lifter (D), and loosen the setscrew (B).
Then adjust the presser bar height. The side of presser foot should be paralleled (F) with the
hole of needle plate.
4. Tighten the setscrew (B).
5. Tighten the setscrew (A).
6. Attach the face plate unit.
9
TO ADJUST THE FEED DOG HEIGHT
When the presser foot is lowered and the feed dogs•iA •• B•jare at their highest position, the
distance between the surface of needle plate (C) and bottom of presser foot should be between
0.75 and 0.95 mm.
To adjust:
1.Set the stitch length dial at “3” and the differential feed dial at “1 .0”.
2.Lower the presser foot and raise the feed dogs (A & B) to their highest position by turning the
balance wheel.
3.Loosen the 4 main & sub feed dog screws (D).
4.Push the main feed dog straight upward (E) and adjust the distance between the surface of
needle plate and bottom of presser foot, then tighten the setscrews (2 screws).
5.When the top of the main feed dog is at the level of the top surface of needle plate in its down-
ward motion by turning the balance wheel, loosen the 2 setscrews for sub feed dog (B), and
push the sub feed dog straight upward (F) until its top surface is leveled (G) to the top surface
of needle plate (C). Then tighten the 2 setscrews of sub feed dog (B).
6.Check if these feed dogs are in parallel with the surface of needle plate while turning the
balance wheel.
110
TIMING OF NEEDLE AND FEED DOG
When the tip of right needle is at 2 mm (J) above the needle plate in its downward motion, and
lowered presser foot, the top of the feed dog teeth (K) should be leveled with the top surface of
needle plate (L) at the end of feed movement (M).
To adjust:
1. Remove the machine base.
2. Loosen set screw (A) and remove setscrew (B). Remove feed base cover (N).
3. Loosen set screw (C) and remove balance weight (O). Loosen setscrew (D) and remove
knife cam (P). Loosen setscrew (E) and remove link pin (Q) and upper knife rod (R).
4. Set feed regulator dial at 3.0, differential dial at 1.0.
5. Raise the presser foot and move the tip of right needle to 2 mm (J) above the needle plate in
its downward motion by turning the balance wheel.
6. Lower the presser foot, and loose the two screws (F) and adjust the position of the feed cam
(S) while aiming the guide line (T).
* Turn the feed cam to the direction G if the feed dogs are lower than the surface of the
needle plate.
* Turn the feed cam to the direction H if the feed dogs are higher than the surface of the
needle plate.
7. Loosen the two screws (I). Turn the balance wheel to bring the 2.5mm hole (U) of sub feed
cam (V) in front position. Put the guide pin (W) through the sub feed to main feed cam.
Tighten the setscrews (I). Clearance between main feed cam and bushing should be 1 mm
(X).
8. Attach the link pin (Q) through the upper knife rod (R), and attach the balance weight (O) and
knife cam (P) to main shaft. Then set them in line with the guide line and tighten the set-
screws (C) and (D).
9. Attach the feed base cover and machine base.
11
TO ADJUST THE TENSION OF SUB THREAD TENSION DIAL
After adjustment of the thread tension for 4 thread overlock sewing, slide the slide lever (C) from
“STD” position to “ R. H.” position without turning the thread tension dials. Make sure the sliding
thread guide (D) is set at “3/4” position.
Set the chainning-off finger position is set at “R” position and remove the left needle and thread
and adjust the sub thread tension dial as follows.
1.When the lower looper thread tension is loose, turn the adjusting screw (E) to the direction of
(A).
2.When the lower looper thread tension is tight, turn the adjusting screw to the direction of (B).
Note: If the tension cannot be set correctly within two turns of the adjusting screw, do not turn the
adjusting screw. It may require to make an adjustment on the other part of mechanism.
12
TO ADJUST THE NEEDLE AND THE UPPER KNIFE TIMING
When the needle bar is at its highest position the upper knife should be also at its highest posi-
tion.
To adjust:
1.Remove the feed base cover.
2.Loosen the two setscrews (A) and remove the balance weight (F).
3.Loosen the two setscrews (B), and adjust the needle and upper knife timing.
* Turn the upper knife drive cam (G) to the direction of (D) when the upper knife timing is
delayed.
* Turn the upper knife drive cam (G) to the direction of (E) when the upper knife timing is
advanced.
4.Tighten the two setscrews (B) firmly. Attach the balance weight (F) and set to guide line (C)
on the balance weight is in line with the one on main shaft and tighten two set screws (A).
5.Turn the balance wheel toward you one cycle, and recheck the needle and the upper knife
timing.
6.Attach the feed base cover.
13
TO ADJUST THE STITCH LENGTH
The actual stitch length should be 2.8 to 3.0 mm when the stitch dial is set at “3”.
To adjust:
1. Set the stitch length dial (C) at “3” and the differential feed dial (D) at “1.0”.
2. Remove the face plate unit, belt cover unit, tension cover unit and front panel unit.
3. If the actual stitch length is larger than 3.0 mm, turn the adjusting screw (E) in the direction of
(A). If the actual stitch length is shorter than 2.8 mm, turn the adjusting screw (E) in the
direction of (B).
4. Attach the front panel unit, tension cover unit, belt cover unit and face plate unit.
14
TO ADJUST THE CLEARANCE BETWEEN EEDLE
AND LOWER LOOPER I NEEDLE GUARDS
When the tip of lower looper (G) comes from the left just behind the needle (I) on the left or right,
the clearance between both needles and lower looper (G) should be between 0 and 0.1 mm. In
this condition, the clearance between both needles and rear needle guard (H) should be between
0 and 0.2 mm.
To adjust:
1. Remove the presser foot and needle plate. Loosen screws (A) and (B) and move the front
needle guard (J) and rear needle guard (H) to get clearance between needle guards and
needle.
2. Turn the balance wheel toward you with your hand to bring the tip of looper just behind the
needle (I) on the right from the left.
3. Loose hexagon bolt (B) just enough to move lower looper driving arm (K), and move it to back
or front to get the proper clearance between lower looper (G) and needle on the right (should
be 0.1 - 0.2 mm).
4. To adjust the clearance between needle on the left and lower looper (G), loosen the screw (D)
and move the needle bar to the direction of (E) or (F) to get proper clearance between both
needle and lower looper (G). Be careful not to change the needle bar height.
5. Recheck the clearance between the needle on the right and lower looper.
Clearance between the needle and rear needle guard:
6. Bring the rear needle guard (H) to the front to set the clearance between the needle (I) and
rear needle guard (H) to 0.1 - 0.3 mm. Then tighten the two setscrews (C).
Clearance between the lower looper and needle:
7. Turn the balance wheel toward you to until the tip of lower looper comes just behind the
center of needle from left. Push the front needle guard (J) against the needle (I) to adjust the
clearance between the needle and lower looper (G). The clearance between needle (I) and
the tip of lower looper (G) should be 0 to 0.1 mm. In this condition, the clearance between the
needle (I) and rear needle guard (H) should be 0 to 0.2 mm. Tighten the two setscrews (A).
8. Check the lower looper (G) position.
9. Check the clearance between the needle (I) and lower looper (G).
10.Check the clearance between lower and upper loopers.
11. Attach the needle plate and presser foot.
15
TO ADJUST THE CLEARANCE BETWEEN NEEDLES
AND FIXED NEEDLE GUARD
The clearance between needle (B) and the fixed needle guard (C) should be 0.1 to 0.4 mm (D).
To adjust:
1.Remove the foot and the needle plate and lower the needle to its lowest position.
2.Loosen the setscrew (A) and adjust the position of the fixed needle guard (C).
When needle position setting knob is set at “S”, the fixed needle guard (C) should touch (F)
the chaining-off finger (E) as shown below
3.Tighten the setscrew (A).
4. Attach the needle plate and the foot.
16
TO ADJUST THE POSITION OF CHAINING-OFF FINGER
When set the needle plate stung knob (E) at guide line “S”, chaining-off finger (B) should touch
with the side of needle plate (C) and tip of chaining-off finger should be at the same level as the
tip pin of the needle plate (D).
To adjust:
1.Remove the presser foot.
2.Set the needle plate setting knob (E) at the guide line (S) on needle plate.
3.Loosen 2 setscrews (A), and move chaining-off finger unit (B) to correct position.
4.Tighten 2 setscrews (A).
5.Set the needle plate setting knob (E) at the guide line (S) and (R) on needle plate and check
the position of chaining-off finger unit (B).
6.Attach the presser foot
17
TO ADJUST THE NEEDLE AND THE LOWER LOOPER TIMING
When the needle comes up 1.4 to 1.8 mm (A) from its lowest position, the tip of lower looper (B)
comes just to left side of left needle (C) on the left.
To adjust:
1. Remove the presser foot and the needle plate.
2. Turn the balance wheel toward you with your hand to bring the needle (C) 1.4 to 1 .8 mm from
its lowest position. Loosen the hexagon bolt (D) just enough to move the lower looper driving
arm (E), and move it until the tip of lower looper (B) comes just to left side of needle on the left
(C).
3. Tighten the hexagon bolt (D). Check if timing of the needle and lower looper is correct. Check
the clearance between the needle and lower looper needle guards.
4. Attach the presser foot and the needle plate.
18
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JANOME MyLock 634D Servicing Manual

MyLock 634D
JANOME
Brand
JANOME
Model
MyLock 634D
Category
Sewing machines
Type
Servicing Manual

JANOME MyLock 634D is a versatile overlock sewing machine that allows you to create professional-looking seams with ease. With its 4-thread overlock stitch, it can handle a variety of fabrics, from lightweight knits to heavy-duty denim. The machine also features differential feed for perfect seam control, and a built-in rolled hem for a clean finish.

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