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5) Oil in the gear box
1. The condition is normal (within the range between the upper and
lower lines for the oil quantity) if the oil level in the gear box can be
seen through the oil peep window when the sewing machine is
made to fall down.
(Same as for the AK unit installed)
(Cautions) 1. The gear box oil and the internal mechanism are
maintenance-free.
The oil type is different from that of the hook oil.
Except for unavoidable problems, never open the
gear box cover .
2. The quantity of oil is normal if the oil level can be
seen through the oil peep window .
6) Placement/displacement of the gear box cover
Never open the gear box unless any problem occurs.
In the case of placement/displacement for unavoidable reasons, pay
attention to the cautions specified below.
[Displacement procedures]
1. Let the sewing machine fall down.
2. Insert the oil pan in the undercover.
3. Remove the oil drain screw to drain oil.
4. Remove the setscrew of the thread tension releasing wire holder
and remove the thread tension releasing wire.
5. Loosen the thread trimmer SOL cable setscrew and remove the
thread trimmer SOL cable.
6. Loosen nine setscrews of the gear box cover and remove the
gear box cover and the gasket.
[Placement procedures]
1. Provide for a new gasket.
Gear box cover gasket Part No.: 40037166
2. The gear box cover and the bed mounting face shall be kept
clean. Wipe off waste oil from these parts.
3. Tighten nine setscrews of the gear box cover. (2-turn tightening)
4. Remove the lubrication stop plug from the bed side and replenish
140cc of the JUKI New Defrex Oil No. 2.
(JUKI New Defrex Oil No. 2 Part No.: MDFRX2700C0)
* After replenishment, confirm the oil level through the oil peep window .
* Apply a sealant when mounting the lubrication stop plug again.
7) Cautions for gear box cover oil during transportation
When the sewing machine is transported, there may be oil leakage
from the air relief hole of the bed side due to vibration.
During transportation, mount the air relief cap , without fail.
(Cautions) Never operate the sewing machine while the air relief
cap is mounted.
Air relief cap : 23601305
oToo less quantity of oil can result
in mechanical wear or heat gen-
eration.
oToo much quantity of oil can raise
inner pressure in the gear box. As
a result, there will be oil leakage
from the air relief hole or the oil
seal of each shaft.
o According to the position of the
head support bar on the sewing
table, the oil level may change.
Use, without fail, the table
exclusively specified by JUKI.
oOil leakage may occur unless the
coupling face is kept clean.
o Change in the oil quantity can be
a cause of problem.
o Inner pressure is raised and oil
leakage occurs.
Adjustment Procedure Results of Improper Adjustment
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