Troubles And Corrective Measures (With Regard To Lubrication) - JUKI LZ-2290 Series Manual Manual

7. TROUBLES AND CORRECTIVE MEASURES
(WITH REGARD TO LUBRICATION)
1) Oil fails to come to oil wick of the face plate.
Trouble
Oil wick of the face plate has dried out.
2) Oil amount in the hook is not obtained or insufficient.
Trouble
Plunger pump fails to operate.
(Oil coming out from the joint section of
machine bed does not move.)
Hook driving
Plunger screw
shaft
Pump metal fixing
screw
Hook
Pump
Hook shaft
driving
metal
setscrew
shaft
Hook
shaft
Oil in the pipe is moving, however, the
amount of oil is insufficient.
• Check whether the route of oil wick from the float case is interrupted.
• Fill oil to oil wick as pump priming in case of a long period of disuse.
• Plunger is not fitted in the groove of plunger of the hook driving shaft.
Remove plunger screw, spring and plunger, and check that the groove of
plunger is in the center of the hole of machine bed.
Longitudinal position of the hook driving shaft is slipped or the position of
pump metal is slipped.
Adjusting the longitudinal position of hook driving shaft
Finely adjust so that the groove of plunger of the hook driving shaft is
aligned with the plunger hole. At this time, loosen the thrust screw of
the hook driving shaft.
Adjusting the position of pump metal
Move the pump metal to the right or left (fine adjustment) and
determine the position of pump metal so that work holes in the
machine arm (plunger hole) are aligned with the plunger holes of pump
metal. (Be sure to check that the plunger smoothly enters.)
In addition, an O ring is mounted on the pump metal. So, be careful at
the time of adjustment.
After determining the position, fix the pump metal fixing screw.
(Tightening torque : 25 Nm)
•When the position of the pump metal is properly adjusted, correct the position
of the hook shaft. (Adjust the groove of plunger to the center of the hole of
machine bed.)
Loosen the setscrews in the hook shaft and adjust the position of the
Plunger
hook shaft to 9 mm from the end face. Adjust the backlash of the hook
hole
bevel gear when tightening the setscrews.
(Open the gear box cover and correction of the gear position, hook shaft
bearing support and position of thread trimmer cam are necessary.)
Screw
• The shape of the top end of the oil amount adjustment screw is
defective.
• The hook shaft front stop plug felt clogs.
• The oil hole of the lubricating hook clogs.
• Re-check the adjustment of the oil amount.
Cause and corrective measure
Cause and corrective measure
At the time of NG
Worn-out or burr of the top end of the plunger
At the time of NG
Replace the plungrer.
Replace it.
55
Replace the felt.
Replace the hook.