Instruction manual

Index Page:
Preface and General Safety Instructions
Service Instructions Class 550-867
(Edition 12/2011)
1 General notes
1.1 Gauges..................................................... 3
1.2 Descriptionofthelockingpositions................................... 4
1.3 Graduationonthehandwheel....................................... 5
2 Sewing machine
2.1 Positionofthearmshaftcrankonthearmshaft............................ 6
2.2 Upperandlowertoothedbeltwheel/toothedbelt.......................... 7
2.2.1 Positionoftheuppertoothedbeltwheel................................ 7
2.2.2 Positionofthelowertoothedbeltwheel................................. 8
2.3 Bottomfeedandsteppingmotor..................................... 9
2.3.1 Pre-setting .................................................. 9
2.3.2 Positionofthefeeddoginthethroatplatecutout........................... 10
2.3.3 Feedingmotionofthefeeddog...................................... 12
2.3.4 Liftingmotionofthefeeddog....................................... 13
2.3.5 Feeddogheight............................................... 14
2.3.6 Balanceweight................................................ 15
2.4 Transmissionlever.............................................. 16
2.5 Needlebarlinkage.............................................. 17
2.5.1 Aligntheneedlebarlinkagelaterally................................... 17
2.5.2 Needlepenetrationinfeedingdirection................................. 18
2.6 Hook,loopingstrokeandneedlebarheight .............................. 19
2.6.1 Looping stroke ................................................ 19
2.6.2 Needlebarheight .............................................. 20
2.6.4 Distance between hook and needle ................................... 21
2.6.5 Needleguard................................................. 22
2.7 Bobbincaseopening............................................ 23
2.7.1 General .................................................... 23
2.7.2 Settingofthebobbincaseopening ................................... 23
2.7.3 Timingofopening.............................................. 25
2.8 Feedingfootandpresserfoot....................................... 26
2.8.1 Feedingfootandpresserfootstroke................................... 26
2.8.2 Strokemotionofthefeedingfoot..................................... 27
2.8.3 Sewingfootpressure............................................ 28
2.9 Sewingfootlifting.............................................. 29
2.9.1 Mechanicalsewingfootlifting....................................... 29
2.9.2 Heightofthesewingfeetarrestedwithhandlever .......................... 30
2.9.3 Heightoftheliftedsewingfeet ...................................... 31
2.10 Thread-guidingparts............................................ 32