Adjusting The Amount Of Oil; Lubricating Other Components - JUKI LBH-1700 Series Engineer's Manual

(3) Adjusting the amount of oil

Adjustment of the amount of oil for both lubricating amount and reflux amount is performed through oil pump base
!1 . In filter screen !2 of the oil pump base, there are three parts which play an role of the filter, namely, unwoven
fabric, oil felt and compression spring.
The lubricating amount will be increased when removing the unwoven fabric and directly placing the felt on the oil
hole.
The standard number of pieces of the unwoven fabric is three pieces. Increasing the number of pieces will
decrease the lubricating amount. The standard value of oil coming out of the oil pipe is 3 to 10 cc per minute at
high speed.
In addition, the lubricating amount is in reverse proportion to the reflux amount (increasing the lubricating amount
will decrease the reflux amount. On the contrary, decressing the lubricatinf amount will increase the reflux amount.).
Take care not to change the number of pieces of the unwoven fabric or crush the filter screen.
<Remarks>
If oil is excessively kept in the reflux felt, the lubricating amount is temporarily increased. However, when the
reflux is completed, the amount will be returned to the normal state.

(4) Lubricating other components

1) Lubricating the hook is performed through felt !3 and the oil wick from oil reservoir 1. Adjustment of the
amount of oil is described in the Instruction Manual. Adjust with the screw in the hook sleeve when the
adjustment cannot be performed with the screw in the machine bed only.
<Check of oil pipe and reflux pipe>
When running the sewing machine at low speed, observe reflux pipe 4 and oil pipe !6 from oil sight window
!5 and make sure whether the oil flows in the respective directions of the arrows. It is normal when it is flowing.
<Matters of caution>
Lubricating amount may be decreased after an extended period of disuse or at the time of unpacking.
This is mainly because that the reflux felt has dried and absorbs a lot of air due to less resistance of
reflux. As a result, suction of oil from the oil reservoir is decreased. At this time, apply oil into the oil
holes in the machine arm and the top cover and leave the machine for approximately 30 minutes or
remove the face cover and apply a few drops of oil to reflux felt 3 at the jaw section of the machine
arm.
In addition, make the sewing machine run idle and make sure that the machine sucks up oil after
performing the aforementioned measures.
Oil pump base
Felt
(Unwoven fabric)
Filter screen
50
− −
Oil felt
Oil pump base spring