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Instructions, Removal and replacement, Principal assemblies – SINGER 251 User Manual

Page 27

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27

INSTRUCTIONS

FOR

REMOVAL AND REPLACEMENT

OF

PRINCIPAL ASSEMBLIES

CAUTION TO MECHANICS

Machines of Class 251- are made with extreme precision in machining and

assembly,

and

the

"Superfinish"

process

provides

microscopically

smooth

bearing

surfaces. Therefore, special care should be taken not to permit any misalignment

of parts or to cause any scratches or nicks on the bearing surfaces by careless

assembly

or

handling

of

parts.

Any

such

damage

might

render

the

machine

incapable of the long, trouble-free service for which it is designed.

See also other documents in the category SINGER Sewing machines: