SINGER 1371A2 - Manual (Page 43)

Trouble Cause Remedy Page
1. Starting pedal does
not work. (The
(1) Needle plate, needle plate base or
bobbin thread trimmer is clogged wdth
O Tilt the machine head and clean them up.
work clamp arm is fibrous dust. O Readjust the installation of the trimmer.
not lifted up fiilly.) (2) The needle thread trimmer is interfered
by the work clamp check or the trimer
driving plate.
or the position of the trimmer driving
plate. 31
2. Machine does not (1) The hand stop crank is not in the O Correct the position of the hand stop 17
reach the high correct position. crank.
speed even when
the pedal is step­
ped down fully.
(2) The belt shifter of the speed transmitter
has not changed to the high speed
pulley.
O Lubricate the shifter driving pin.
3. A loud noise is (1) Improper setting of the low speed cam O Readjust the setting of the low speed 25
produced with a for small numbers of stitches. cam.
stop-motion, or se­
wing speed does
(2) The flat belt is too loose. O Increase the belt tension by the tension
pulley.
10
not lower at the
end of sewing.
(3) The low speed V belt is too loose. O Increase the tension of the V belt by the
motor.
8
4. Stop-motion is not (1) Stop-motion lever needs lubrication. O Lubricate the stop-motion lever. 12
smooth. (2) The belt shifter of the speed transmitter
has not changed to the low speed pulley.
O Readjust.the position of the belt shifter. 31
5. The machine does (1) Oil level in the oil reservoir is too low. OFill the lubricating oil up to "HIGH" 12
not lubricate. mark.
(2) Oil is not circulated. O Apply oil to the oil return felts. 12
6. Knife is dropped (1) Position of the knife tripping segment is ©Adjust the position of the driving cam so 34
during high speed not correct. that the knife is dropped down at a
rotation. delayed timing.
(2) The setting of the low speed cam for
numbers of stitches is not correct.
O Correct the seting of the low speed cam. 25
7. Knife is dropped
even if the needle
thread is broken.
(1) The machine is threaded incorrectly. O Correct the threading. 16
8. Needle is broken. (1) The needle is bent. O Replace the needle. 13
(2) The needle and the hook blade touch
with each other.
©Readjust the positions of the needle and
the sewing hook.
29
(3) Needle thread trimmer hits the needle © Readjust the position of the trimmer. 31
when opening its blades. ©Adjust so that the hmiting plate and the
blocking arm touch each other at the
time of starting.
31
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