Chapter 8 Maintenance and Inspection
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If the lubricant is overfilled, there is a possibility of high internal pressure and that an oil seal could
fall off, the lip could be reversed, or lubricant could leak. If the lubricant is insufficient, a lubrication
failure could occur and the reduction gear could be damaged.
The shape of the reduction gear may differ from the illustration in Fig. 8-2, depending on the ordered
specifications. For details on the shape, refer to the catalog and the separately provided “External
dimensions” drawings and specification sheet.
If the filling amount of the lubricant is insufficient, it could cause premature damage to the reduction
gear.
Step 1
Rotate the output shaft of the reduction gear so that the tapped holes for injecting/draining grease are
positioned diagonally.
(When rotating the output shaft using electric power, do not approach the equipment and reduction
gear. When rotating the output shaft without using electric power, perform step 2 first.)
Step 2
Turn OFF the power to the device and confirm that the device is completely stopped.
Step 3
Remove both of the plugs for the tapped holes for injecting/draining grease, and drain the lubricant
from the upper tapped hole for injecting/draining grease.
• Check the amount of drained lubricant by catching it with a container, etc., in order to control
the same amount of lubricant to be drained and filled.
• Always drain the lubricant while the reduction gear is cooled.
If the tapped hole for injecting/draining grease is unplugged while the reduction gear is still hot,
high-temperature lubricant sprays out, which could cause burns.
Step 4
Attach a grease nipple, etc. to the tapped hole for injecting/draining grease and then attach the
injector. (Refer to Fig. 8-2)
Step 5
• Using the injector or the like, fill the lubricant through the tapped hole for injecting/draining
grease on the supply side.
• When filling the lubricant, be sure to remove the plug for the tapped hole for
injecting/draining grease on the drain side.
• When pneumatic pressure is used for filling the lubricant, set the pressure below 0.03 MPa.
If you fail to remove the plug for tapped hole for injecting/draining grease on the drain side, the
internal pressure increases. As a result, oil seals could fall off or the oil seal lip could be reversed.
If the internal pressure of the reduction gear increases, oil seals could fall off or lubricant could leak.
Step 6
• Inject the lubricant until it overflows from the tapped hole for injecting/draining grease on the
drain side.
Step 7
• Remove the injector from the grease nipple and plug the tapped holes for injecting/draining
grease on both the greasing and drain sides.
Note
Note
