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General| Brand | Singer |
|---|---|
| Model | 990B3 |
| Category | Sewing Machine |
| Language | English |
Describes the machine varieties and their purpose.
Lists key features and capabilities of the sewing machines.
Details the specifications for the 990B3 and 990B5 models.
Step-by-step guide for setting up the sewing machine.
Information on pulley operation and optimal machine speed.
Guidance on selecting needles, thread types, and adjusting tension.
How to adjust presser foot pressure and stitch length.
Instructions for threading the unwinder and the machine.
Procedures for adjusting feed bars, dogs, and eccentrics.
Setting and aligning stationary and movable knives.
Setting the position and relationship of the left hand looper.
Setting the right hand looper and its linkage.
Adjusting the needle carrier and needle guard for proper function.
Adjusting oil pump relief valve and rotary shaft axial play.
Setting the thread controller and looper thread take-ups.
Procedures for removing and replacing the feed mechanism.
Removing and replacing knife mechanisms.
Procedures for left and right hand looper mechanisms.
Removing and replacing needle carrier and oil pump.
Steps for removing and replacing the rotary shaft.
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