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Centurion 121C
Service manual
Singer Centurion 121C Service Manual
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Service manual
(48 pages)
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Table of Contents
Lubrication
To Test Hook Lubrication
Machine Threading
Stitch Length
Preventing Unauthorized Changes in Stitch Length
Adjustable Stitch Length Stop
Presser Foot Pressure
Hook Timing
Timing Feed Lifting Shaft to Arm Shaft
Feed Dog Setting
To Adjust Feed Dog Height at .043 Inch
To Adjust Feed Dog Height at .032 Inch
Check Spring Setting
Tension Release
Presser Bar and Foot Setting
Setting Heedle Bar Frame Timing Indicator
Setting Needle Bar Height
Bobbin Winder Drive Wheel Adjustment
Bobbin Winder Driven Wheel Adjustment
To Adjust Bobbin Winder
Disassembly Sequence
Presser Bar
Needle Bar Frame and Take-Up Mechanism
Tension Release Mechanism
Arm Shaft
Feed Lifting Shaft
Feed Rock Shaft
Feed Reversing Mechanism
Feed Reversing Lever Mechanism
Knee Lift Mechanism
Hook Shaft and Bushing
Assembly Sequence
Feed Reverse Drive Assembly
Hook Shaft and Hook Shaft Bushing
Presser Bar Assembly
Needle Bar Frame Driving Linkage Adjustments
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Lubrication
2
Machine Threading
3
Stitch Length
4
Hook Timing
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Centurion 121d
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