Brother T-8720C User Manual

T-8420C, 8450C, 8720C, 8750C
CONTENTS
1. NAMES OF MAJOR PARTS ................ 1
2. MACHINE SPECIFICATIONS ..............
2
3. TABLE AND MOTOR ...........................
3
4. INSTALLATION....................................
4
4-1. Installation ...................................................... 5
4-2. Lubrication ...................................................... 11
4-3. Checking the machine pulley rotating direction .... 13
4-4. Alarm display (Semi dry type) ........................ 13
5. PREPARATION BEFORE SEWING.....14
5-1. Installing the needle........................................ 14
5-2. Removing the bobbin...................................... 15
5-3. Winding the lower thread................................ 16
5-4. Installing the bobbin........................................ 17
5-5. Threading the upper thread............................ 19
5-6. Adjusting the stitch length............................... 21
5-7. Using the knee lifter........................................ 21
5-8. Corner sewing method (T-8450C, 8750C) ..... 22
5-8-1. To stop the needle bars
(right and left)....................................... 22
5-8-2. Number of stitches: quick-reference
guide .................................................... 22
6. SEWING................................................23
6-1. Sewing............................................................ 23
6-2. Backtacking .................................................... 23
6-3. Sewing condensed stitches............................ 24
7. THREAD TENSION ..............................25
7-1. Adjusting the thread tension ...........................25
7-2. Adjusting the presser foot pressure ................26
7-3. Adjusting the presser foot floating amount
(minute lifting amount) ....................................27
7-4. Adjusting the thread take-up amount..............28
8. CLEANING ...........................................29
8-1. Daily cleaning procedures...............................29
8-2. Lubricating via the oil cover
(every 6 months) .............................................30
8-3. Applying grease - When the GREASE
indicator illuminates (Semi dry type)...............31
9. ADJUSTING THE ROTARY HOOK
LUBRICATION AMOUNT ....................
34
10. STANDARD ADJUSTMENT...............
35
10-1. Thread take-up amount for thread take-up
spring .............................................................35
10-2. Thread take-up spring tension ........................36
10-3. Clearance between rotary hook and needle
plate ...............................................................37
10-4. Clearance between rotary hook and
opener ............................................................38
10-5. Presser foot height..........................................38
10-6. Needle and rotary hook timing ........................39
10-7. Installing the feed dog.....................................41
10-8. Feed dog position ...........................................42
10-9. Feed dog height ..............................................43
10-10. Feed dog angle .............................................44
11. TROUBLESHOOTING........................45

Brother T-8720C Specifications

General

Brand	Brother
Model	T-8720C
Category	Sewing Machine
Language	English