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Adjustment Procedures Results of Improper Adjustment
1. Disassembling
1) Remove top cover 7 and side cover 8.
2) If packing 9 of the top cover has been adhered on the frame,
also remove packing 9.
3) Remove needle front plug !1.
4) Loosen setscrew !0 of needle lubricating pin 4 and remove
needle lubricating pin 4.
5) Remove needle bar upper bushing cap screw !2 and loosen
setscrew !3 in the needle drive pin.
6) Fitting needle drive pin 2 in the hole on the frame side, thrust
the pin until it can be drawn out.
2. Adjustment
1) Bring needle bar 1 to the lower dead point.
2) Adjust oil wick 3 in needle drive pin 2 so that it should be
flush with the chamfered plane of the pin.
(If oil wick 3 sinks inside the chamfered plane as the concave,
oil will not be fed smoothly.)
3) Install needle lubricating pin 4 in place with its oil inlet 6 faced
above.
4) Adjust with setscrew !0 so that the clearance between needle
lubricating pin 4 and needle drive connecting link 5 is 0.1
mm. (It is convenient to use a 0.1 mm clearance gauge or the
like.)
™ If the oil wick is installed in the
needle drive connecting link pin
inside the pin as the concave,
oil will not lubricated properly
resulting in seizure.
™ If the clearance provided
between the needle lubricating
pin and the needle drive
connecting link is too small, the
related components will come in
contact with each other.
™ If the clearance provided
between the needle lubricating
pin and the needle drive
connecting link is too large, oil
wll not be fed properly resulting
in seizure.
™ If the oil inlet does not face
upward, oil will not be fed
resulting in seizure.
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