−
38
−
24 mm
2) Oil amount in the hook does not appear or is small.
3) Noise of the gear is large.
3-33 Applying the exclusive grease
*
For the parts other than the lubrication components, the exclusive grease (23640204) is applied to the parts
where the lubrication is necessary. Never use other grease.
Additional grease is not necessary if the machine is normally used.
When the machine is used under the severe conditions, it is effective to fill grease periodically (once in every
one or two years).
[Notes when applying grease]
1) Needle bar metal section of DS and DF machine heads
There is a grease groove inside the needle bar lower metal. Draw out the needle bar and fill the exclusive
grease to the groove section. Apply a small quantity of grease to the lower end section of the upper metal.
When filling the grease newly, make the sewing machine run idle for every 10 seconds, discharge extra
grease that occurs at this time, and wipe it out. Perform this operation several times, and use the machine
after the grease stops coming out.
Phenomenon
Plunger pump does not work.
(Oil in the pipe coming from machine bed
section does not move.)
Oil amount is small although oil in the pipe
moves.
Cause and corrective measure
• Plunger is not fit in the plunger groove of the hook shaft. Remove plunger
screw, spring and plunger, and check that the plunger groove is placed in
the center of the hole of machine bed.
↓
At the time of NG (no good)
Longitudinal position of the hook shaft is slipped or the position of the
hook shaft front metal is slipped.
End face of the hook shaft front metal is 24 mm from the needle entry
position.
When this distance is proper, correct the position of the hook shaft.
(Adjust the plunger groove to the center of the hole of machine bed.)
(It is necessary to open the gear box and correct the positions of the
gear, hook shaft bearing support and thread trimmer cam.)
• Abration or burr at the top end of the plunger
↓
At the time of NG (no good)
Replace the plunger.
• Defective shape at the top end of oil amount adjustment screw
→
Replace.
• Hook shaft front stopper plug felt is clogged.
→
Replace.
• Oil hole in the lubricating hook is clogged.
→
Replace.
• Re-check the adjustment of oil amount (Item 3-36)
Needle entry
position
(1)
Phenomena
Oil is not contained or is short in the gear box.
Cause and corrective measure
• Oil inside the gear box has leaked since air vent cap was not provided at
the time of transportation.
Remove cap (1) in the front face of machine bed, insert a rather hard
string into the gear box to check that oil is enough contained inside of it.
→
when oil is short, open the gear box cover and suck out with vinyl pipe
all oil contained inside the gear box. Then, fill the gear box with JUKI
New Defrix Oil No. 2 of 140 cc.
When attaching stopper plug (1), apply sealant to it.
