JUKI LU-2800 Series, Engineer'S Manual

Page: 12 / 143

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CONTENTS
1. Specifications ........................................ 1
2. Standard adjustment ............................ 4
(1) Needle entry position
(Standard gauge type) ............................. 4
(2) Needle entry position
(Europe gauge type) ................................6
(3) Height of the feed dog ............................. 8
(4) Height of the hook ....................................8
(5) Adjusting the opener .............................10
1) Clearance of opener .................................... 10
2) Opener timing .............................................. 12
(6) Needle-to-hook timing ........................... 14
1) Height of the needle bar .............................. 14
2) Needle-to-blade point of hook timing ........ 14
3) Adjusting the hook needle guard ............... 14
(7) Lift of the presser foot ........................... 16
1) Hand lifter ..................................................... 16
2) Knee lifter (Without thread trimmer only) ... 18
3) Automatic presser foot lifter
(Machine with thread trimmer only) ........... 20
(8) Feed adjustment .....................................22
1) Horizontal feed cam timing ......................... 22
2) Vertical feed cam timing ............................. 22
3) Alternate momentum ................................... 24
4) Top feed cam timing .................................... 24
(9) Needle sway
(Adjusting the bottom feed amount) .... 26
(10) Stitch length of forward/reverse feed ... 28
(11) Position of the reverse feed
control lever ............................................30
(12) Safety clutch ...........................................32
(13) Balancer ..................................................34
(14) Reverse feed cylinder ............................36
(15) Lubrication ..............................................40
(16) Thread trimmer device
(Except for LU-2828-6 and 2828-7) ....... 42
1) Position of the counter knife
and the clamp spring .................................. 42
2) Position of the counter knife base ............. 44
3) Vertical position of the moving knife ......... 46
4) Thread trimmer cam timing ........................ 48
5) Position of the thread trimmer cam ........... 50
6) Adjusting the knife pressure ...................... 50
(17) Adjusting the thread trimmer compo-
nents for LU-2828-6 and 2828-7 ............ 52
1) Adjusting the moving knife, the counter
knife and the bobbin thread clamp ............ 52
2) Adjusting the thread trimmer cam timing ... 54
(18) Detection switch of the amount of
alternate vertical movement .................. 56
(19) DL device ................................................58
(20) Adjusting the bottom feed momentum ... 60
(21) 2P feed adjustment ................................62
1) LU-2810-6, 2810-7, 2860-6, 2860-7 .............. 62
2) LU-2828-6, 2828-7 ........................................ 64
3) LU-2818-7, 2868-7 ........................................ 66
(22) Replacing the motor ..............................70
(23) Adjusting the condensation stitch
(LU-2828-6, 2828-7) ................................72
(24) Condensation cylinder
(LU-2818-7, 2868-7) ................................72
3. Portion to which LOCKTITE is
applied .................................................. 74
4. Selective parts and consumable
parts ..................................................... 75
5. Applying grease .................................. 77
(1) Applying grease .....................................77
(2) Greasing points ......................................77
1) Needle bar rocking base ............................. 77
2) Alternate vertical change base ................... 78
3) Horizontal feed change base ...................... 78
4) Greasing point indication drawing
(* Indicating the points where grease is
applied at shipment.) ................................... 79
6. Engraved marker dots on the hand-
wheel (for the machine with thread
trimmer only) ....................................... 99
7. Machine head wiring ......................... 100
(1) LU-2810-7, 2860-7 .................................100
1) Connectors coming from machine head
(Connect to control box) ........................... 100
2) Connectors that are connected
in the head cover ....................................... 101
(2) LU-2810-6, 2860-6 .................................101
1) Wiring diagram .......................................... 101
2) Details of connectors ................................ 102
(3) LU-2828-7 ..............................................105
1) Connectors coming from machine head
(Connect to control box) ........................... 105
2) Connectors that are connected
in the head cover ....................................... 106
(4) LU-2828-6 ..............................................106
1) Wiring diagram .......................................... 106
2) Details of connectors ................................ 107
(5) LU-2818-7, 2868-7 ................................. 110
1) Connectors coming from machine head
(Connect to control box) ........................... 110
2) Connectors that are connected
in the head cover ........................................111
8. Troubles and corrective measures ...112
(1) With regard to sewing .......................... 112
(2) With regard to thread trimming........... 117
9. Lubrication route diagram ................ 123
(1) LU-2810, 2810-6, 2810-7, 2828-6,
2828-7, 2818-7 .......................................123
(2) LU-2860, 2860-6, 2860-7, 2868-7 .......... 124
10. Drawing of table ................................ 125
(1) For without thread trimming
(LU-2810, 2860) .....................................125
(2) For SC-922 (LU-2810-7, 2860-7) .......... 126
(3) For V-belt (Machine with thread
trimmer) (LU-2810-6, 2860-6) ............... 127
(4) For SC-922 (LU-2810-7, 2860-7,
2828-7, 2818-7, 2868-7) ........................128
(5) For V-belt (Machine with thread
trimmer) (LU-2810-6, 2860-6, 2828-6) ... 129