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1. NAMES OF MAJOR PARTS
2. MACHINE SPECIFICATIONS
3. OPTIONAL PARTS
.................................................. 5
4. WORK TABLE AND MOTOR
5. INSTALLATION
........................................................ 9
5-1. Installing the oil pan ........................................... 10
5-2. Installing the machine head ............................... 11
5-3. Installing the knee lifter assembly ..................... 12
5-4. Installing the belt ................................................. 14
5-5. Installing the bobbin winder .............................. 14
5-6. Installing the belt cover ...................................... 15
5-7. Installing the pulley ring ..................................... 17
5-8. Installing the filter ............................................... 17
5-9. Lowering the suction tube .................................. 18
5-10. Installing the cotton stand ................................ 18
5-11. Ground Wire Connections (877A/878A) ........... 19
5-12. Lubrication .......................................................... 20
5-13. Checking the machine pulley rotating
direction .............................................................. 23
6. PREPARATION BEFORE SEWING
6-1. Installing the needle ............................................ 24
6-2. Removing the bobbin or cap ............................. 25
6-3. Winding the lower thread ................................... 26
6-4. Installing the bobbin or cap ............................... 28
6-4-1. Installing the bobbin
[877A, 877B, 878A] ...................................... 29
6-4-2. Installing the cap
[878B, 877B (option)] ................................... 30
6-5. Threading the upper thread ............................... 31
6-6. Adjusting the stitch length ................................. 35
6-7. Keeping the presser foot in the raised
position ................................................................. 36
7. SEWING
..................................................................... 37
7-1. Sewing .................................................................. 38
7-2. Backtacking ........................................................... 38
8. THREAD TENSION
.................................................. 39
8-1. Adjusting the thread tension .............................. 39
8-2. Adjusting the presser foot pressure .................. 43
8-3. Adjusting the trailing length after thread
trimming (877B, 878B) ........................................ 43
8-4. Adjusting the walking foot and inner presser
foot ........................................................................ 45
CONTENTS
................................. 1
................................. 3
................................ 7
...................... 24
SU-877A/B, TU-878A/B (English)
9. CLEANING
................................................................ 47
10. STANDARD ADJUSTMENTS
10-1. Adjusting the thread tension spring .................. 51
10-2. Adjusting the presser foot height ...................... 55
10-3. Adjusting of the feed dog height ...................... 56
10-4. Adjusting the forward/back position of
the feed dog ........................................................ 57
10-5. Adjusting the needle and rotary hook timing .. 59
10-5-1. Needle to rotary hook point gap ............... 59
10-5-2. Clearances between rotary hooks
and needle plate .......................................... 61
10-5-3. Clearance between rotary hook and
opener ........................................................... 62
10-5-4. Needle bar height and lift amount ............ 63
10-5-5. Adjusting the walking foot, inner
presser foot and needle timing .................. 66
10-6. Tension Release (877B, 878B) ............................ 67
10-7. Synchronizer adjustment (877B, 878B) ............. 69
10-8. Upper and lower shaft timing adjustment ....... 71
10-9. Adjusting the rotary hook lubrication
amount ................................................................. 73
10-10. Changing the knee lifter heaviness ................. 75
11. REPLACING THE FIXED KNIFE AND
MOVABLE KNIFE (877B/878B)
12. REPLACING GAUGE PARTS (CHANGING THE
NEEDLE WIDTH-878A/878B)
13. INSTALLING OPTIONAL PARTS
13-1. Replacing the rotary hook .................................. 91
13-2. Replacing the upper thread tension
assembly (878A/878A) ......................................... 95
14. SAFETY EQUIPMENT
15. TROUBLESHOOTING GUIDE
............................... 50
............................ 76
................................ 83
......................... 90
............................................. 96
............................. 100
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