Brother BAS-311F-L, BAS-326F-0, BAS-311F-0 Replacing the bobbin case and threading the thread

5. INSTALLATION

5-5. Replacing the bobbin case and threading the thread

CAUTION

If the power switch needs to be left on when carrying out replacing the bobbin, be extremely careful to observe all safety precautions.

The machine may operate if the foot switch is depressed by mistake, which could result in injury. (ex. Continuing sewing from a stopping point)

(3)	(2)	30 mm
	(4)

(1)

1201S 0110Q 1202S

1.Pull the shuttle race cover (1) forward and then open the cover.

2.Lift the bobbin case latch and remove the bobbin case.

3.Insert a new bobbin into the bobbin case, and then pass the thread through the slot (2) and pull it out from the thread hole (3). Check that the bobbin turns in the direction of the arrow when the thread is pulled at this time.

4.Pass the thread through the lever thread hole (4), and then pull out approximately 30 mm of thread.

5-6. Sewing conditions and thread tension

5-6-1. Sewing conditions

	BAS-311F-0, 326F-0		BAS-311F-0	BAS-311F-L
Specifications	For heavy materials	For medium	For extra heavy	For heavy materials
		materials	materials	(denim)
Upper thread	# 20 or equivalent	# 50 or equivalent	# 4 or equivalent	# 20 or equivalent
				(cotton)
Lower thread	# 20 or equivalent	# 60 or equivalent	# 4 or equivalent	# 20 or equivalent
				(cotton)
Upper thread	1.4 - 1.8	1.0 - 1.3	4.5 - 5.0	1.4 - 1.8
Tension (N)
Lower thread	0.2 - 0.3		1.0 - 1.2	0.3 - 0.4
Tension (N)
Thread take-up	6 - 8		0	6 - 8 mm
spring height (mm)
Thread take-up	0.4 - 0.6	0.15 - 0.35	-	0.4 - 0.6
spring tension (N)
Pre-tension (N)	0.3 - 0.5	0.1 - 0.3	0.3 - 0.5	0.2 - 0.4
Needle	DP X 17 # 21	DP X 5 # 16	DP 17 # 25	DP X 17 # 19
Normal sewing	2000 rpm	2000 rpm	1300 rpm	2000 rpm
speed

The sewing conditions given in the above table may need to be changed depending on the article being sewn.

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BAS-311F-0, 311F-L, 326F-0