Brother DB2-DD7100, Service Manual

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4. MECHANICAL DESCRIPTIONS
SL-710A
8
4-5. Lubrication mechanism (Thread take-up lever and rotary hook)
The lubrication mechanism for this sewing machine is a dry head method, with the oil supplied from a tank.
The oil level can be checked through the oil gauge window, without needing to tilt back the machine head or operate the
sewing machine.
DD7100A, 710A
When adding the lubricating oil for the first time after unpacking the sewing machine, pour 130 ml of lubricating oil in
through oil filler hole (1). The oil gauge in the oil gauge window (2) will rise as far as the upper reference line. (Refer to
page 59 for details on the lubrication method.)
1. The lubricating oil that is poured into the oil filler hole (1) is stored in the oil tank (3).
2. The lubricating oil in the oil tank (3) is drawn up by the plunger pump (4).
3. The lubricating oil in the sub tank (5) is transferred to parts such as the thread take-up lever and needle bar by wicks.
* The rotary hook lubrication amount can be adjusted using the adjusting screw (6). (Refer to page 73.)
(2)
(3)
(4)
(5)
(1)
(6)
(6)
(5)
1636M
1635M
1634M
1633M
To upper shaft, thread take-up
lever, needle bar, etc.
Used oil
To rotary hook and rotary
hook shaft
Upper reference line
Oil gauge
Lower reference line
(2)
Oil gauge window
Plunger pump
Oil gauge
Increase
Decrease
(4)