Table of Contents
Service Instructions 869-M PREMIUM - 00.0 - 07/2018 1
1 About these instructions ......................................................... 5
1.1 For whom are these instructions intended?................................ 5
1.2 Representation conventions – symbols and characters ............. 5
1.3 Other documents ........................................................................ 7
1.4 Liability........................................................................................ 7
2 Safety ......................................................................................... 9
2.1 Basic safety instructions ............................................................. 9
2.2 Signal words and symbols used in warnings ............................ 10
3 Working basis ......................................................................... 13
3.1 Order of the settings ................................................................. 13
3.2 Laying the cable guide.............................................................. 13
3.3 Calling up the service routine ................................................... 14
3.4 Removing the covers................................................................ 16
3.4.1 Access to the underside of the machine................................... 17
3.4.2 Removing and placing the arm cover ....................................... 18
3.4.3 Removing and placing the head cover ..................................... 19
3.4.4 Removing and placing the valve cover ..................................... 20
3.4.5 Disassembling and assembling the throat plate slide............... 21
3.4.6 Disassembling and assembling the throat plate ....................... 22
3.4.7 Disassembling and assembling the feed dog ........................... 23
3.5 Flats on shafts .......................................................................... 24
3.6 Locking the machine in place ................................................... 25
4 Setting the handwheel scale.................................................. 27
5 Positioning the arm shaft....................................................... 28
6 Positioning the toothed belt wheels ..................................... 29
6.1 Positioning the upper toothed belt wheel.................................. 30
6.2 Positioning the lower toothed belt wheel .................................. 31
7 Setting the mechanical stitch adjustment............................ 32
7.1 Setting the stitch regulator gear................................................ 32
7.2 Setting the eccentric for the forward and backward stitches .... 35
8 Setting the feed dog ............................................................... 36
8.1 Setting the feed dog position .................................................... 36
8.2 Setting the feed dog movement................................................ 38
8.2.1 Setting the feed dog feed movement........................................ 38
8.2.2 Setting the feed dog height at top dead center......................... 40
8.2.3 Setting the feed dog stroke movement..................................... 41
9 Aligning the needle bar linkage............................................. 42
9.1 Aligning the needle bar linkage sideways................................. 42
9.2 Aligning the needle bar linkage in the sewing direction ............ 44
10 Position of the hook and needle ........................................... 46
10.1 Setting the hook side clearance................................................ 46
10.2 Setting the loop stroke position................................................. 48
10.3 Setting the needle guard........................................................... 49
10.4 Setting the needle bar height.................................................... 50
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