Improper Feeding
1.
Feed
dog
set
too
low
2. Tooth
pattern
on
feed
dog
too
fine for material sewn
3. Type of feed dog unfit for work to be performed
4. Insufficient
amount
of
pressure
exerted
by
pressar
foot
5.
Lint
accumulated between teeth of feed dog
6. Blunt feed points
Overhecriing
1. Oil hole in hook choked up causing overheating of hook
2. Oil regulating screw q (Photo 21)
too
tight
3. Oil flow for
head
parts
(stud o in Photo 20) insufficient
4. V-belt too tense, causes excessive pressure on arm shaft bearings
5.
Full
weight of motor presses on V-belt because belt take-up hanger
has
become
loose
6. Improper oil used. (Viscous oil cannot
penetrate
the
narrow
conduits
when
the machine is cold).
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