Adjusting The Rotary Hook Lubrication Amount - Brother BAS-342G Service Manual

7-8. Adjusting the rotary hook lubrication amount

Less oil
More oil
Aligned
4036M
Oil tube
More oil
Three turns of the set
screw (1)
Less oil
4037M
4037M
More oil
Less oil
4038M
BAS-342G
<Adjusting by changing the pressure on the oil tube>
The optimum position is when the head of the set screw (1)
is aligned with the edge of the bed. The rotary hook
lubrication amount can be adjusted within three turns to the
right from that position.
• If the set screw (1) is turned clockwise, the lubrication
amount becomes smaller.
• If the set screw (1) is turned counterclockwise, the
lubrication amount becomes greater.
* If you would like the lubrication amount to be increased
further from the position the head of the set screw (1) is
aligned with the edge of the bed, use the following method
to make the adjustment.
<Adjusting by changing the amount of oil supplied from
the sub-tank>
1. Remove the four screws (1), and then remove the X motor
cover (2).
2. Tilt back the machine head.
3. Insert a screwdriver into the holes in the left side of the
sewing machine bed and loosen the two bolts (3).
4. Move the sub-tank (4) up or down to adjust its position,
and then tighten the two bolts (3).
• If the position of the sub-tank (4) is raised, the
lubrication amount will increase.
• If the position of the sub-tank (4) is lowered, the
lubrication amount will decrease.
5. Return the machine head to its original position.
6. Install the X motor cover (2) with the four screws (1).
7. ADJUSTMENT
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