JUKI DLN-6390 Manuel D'utilisation page 84

(2) Adjusting the amount of oil in the hook
WARNING :
Be extremely careful about the operation of the machine since the amount of oil has to be checked
by turning the hook at a high speed.
1 Amount of oil (oil splashes) confi rmation paper
Approx. 70 mm
＊ Use any paper available regardless of the material.
＊ When performing the operation of 2) below, remove needle thread from the thread take-up lever to needle and
bobbin thread. Then be careful to check the machine with the presser foot lifted. At this time, be careful not
to allow your fi ngers to touch the hook.
1) If the machine has not been suffi ciently warmed up for operation, make the machine run idle for approximately three
minutes. (Moderate intermittent operation)
2) Place the amount of oil (oil splashes) confi rmation paper under the hook while the sewing machine is in operation.
(Section A in the direction of the arrow mark ( → ))
3) Confi rm that the height of the oil surface in the oil reservoir is within the range between "H" and "L".
4) Confi rmation of the amount of oil should be completed in fi ve seconds. (Check the period of time with a watch.)
• Sample showing the appropriate amount of oil
Splashes of oil from the hook
4 to 5mm
• Adjusting the amount of oil (oil spots) in the hook
2 Position to confi rm the amount of oil (oil splashes)
1) The sample shown in the fi gure on the left side is the
2) Adjust the amount of oil in the hook so that the oil
1) Turning the oil amount adjustment screw in the "+" di-
B A
2) After the amount of oil in the hook has been properly
– 20 –
amount of oil adjusted at the time of delivery.
Check the amount of oil before using the machine and
re-adjust the amount of oil appropriately according to
the condition of use. (If the oil amount is inadequate,
the hook can be seized (the hook becomes hot). If the
oil amount is excessive, the sewing product can be
stained with oil (oil leaks))
amount (oil splashes) should not change while check-
ing the oil amount three times (on the three sheets of
paper).
rection (in direction A ) will increase the amount of oil (oil
spots) in the hook, or in the "–" direction (in direction B )
will decrease it.
adjusted with the oil amount adjustment screw, make
the sewing machine run idle for approximately 30 sec-
onds to check the amount of oil in the hook.
A