Index
Contents ..................................................................................Page
1 Adjustment ........................................................................................................................... 5
1.01 Tools, gauges and other accessories for adjusting ................................................................ 5
1.02 Abbreviations ......................................................................................................................... 5
1.03 Explanation of the symbols .................................................................................................... 5
1.04 Check and adjustment aid ...................................................................................................... 6
1.05 Adjusting the basic machine .................................................................................................. 7
1.05.01 Balancing weight .................................................................................................................... 7
1.05.02 Centering the needle in the needle hole (in sewing direction) ............................................... 8
1.05.03 Parallel guiding of the needle bar ........................................................................................... 9
1.05.04 Locking lever ........................................................................................................................ 10
1.05.05 Zero stitch and zigzag stitch scale ........................................................................................ 11
1.05.06 Centering the needle in the needle hole (crosswise to sewing direction) ........................... 12
1.05.07 Zigzag stitch width ............................................................................................................... 13
1.05.08 Zigzag stitch movement (only on the 918 and 938) ............................................................. 14
1.05.09 Needle penetration symmetry - left, centre and right (only on the 918 and 938) ................ 15
1.05.10 Multi-stitch movement (only on the 918U and 938U) .......................................................... 16
1.05.11 Zigzag movement (only on the 918U and 938U) .................................................................. 17
1.05.12 Target positioning sensor (only on the 918U and 938U) ...................................................... 18
1.05.13 Needle position adjustment lever ........................................................................................19
1.05.14 Zero position of the bottom feed dog (with closed gear box) .............................................. 20
1.05.15 Zeroing the bottom feed (with open gearbox) ..................................................................... 21
1.05.16 Feeding motion of the bottom feed dog .............................................................................. 22
1.05.17 Lifting motion of the bottom feed dog ................................................................................ 23
1.05.18 Drive belt in the gearbox housing ........................................................................................ 24
1.05.19 Hook bearing bracket .......................................................................................................... 25
1.05.20 Hook lubrication ................................................................................................................... 26
1.05.21 Pre-adjusting the needle height ........................................................................................... 27
1.05.22 Needle rise, hook-to-needle clearance and bobbin case positioning-fi nger ......................... 28
1.05.23 Final adjustment of the needle height ................................................................................. 29
1.05.24 Bobbin case opener position .............................................................................................. 30
1.05.25 Bobbin case opener motion ................................................................................................. 31
1.05.26 Bottom feed dog height ..................................................................................................... 32
1.05.27 Presser foot to needle plate clearance ................................................................................ 33
1.05.28 Presser foot pressure ......................................................................................................... 34
1.05.29 Needle thread tension release (on machines without -900/24) ........................................... 35
1.05.30 Thread diverter pin ............................................................................................................... 36
1.05.31 Limiting the knee lever stroke ............................................................................................ 37
1.05.32 Knee lever play ..................................................................................................................... 38
1.05.33 Bobbin winder ...................................................................................................................... 39
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