Brother B706 - Page 7

2. Lower shaft oil supply
Lower shaft
(I) The oil is supplied by the pump to the lower shaft and lower shaft bushing L f).
(2) Part of the oil from lower shaft bushing L f) flows through the lower shaft to the rotary hook.
Also, the oil ejected from lower shaft bushing L f) is supplied to the horizontal feed rocker shaft 0 and the
vertical feed shaft 8 via a wick.
(3)
The oil dispersed in the ar.,m column is supplied to lower shaft bushing R 0, the horizontal feed rocker shaft
0, and the vertical feed shaft 8 via the arm channel.
3. Pump mechanism
When the vanes at the bottom of the vertical
shaft turn, the centrifugal force sucks the oil up
through the hole in the center. The oil is then
expelled from the outlets at the ends of the spinal
chambers to the various oil tubes.
In addition, a plunger pump attached to the
pump body draws oil which accumulates in the
dip in the arm back to the pump.
-5-
----Pump body
____ Rotating
vanes
From the library of: Superior Sewing Machine & Supply LLC