5. Maintenance and Inspection
5.4.2 How to Apply Grease
(1) For RA4, remove slim hexagonal socket head bolts (M3 × 4) blocking the greasing port by
Allen wrench.
For RA6/RA7/RA8, remove the rubber cap blocking the greasing port.
(2) Grease the ball screws and the whirl-stop according to the following instructions.
[Ball Screw]
Adjust the rod to the home position.
By adjusting it to the home position, the greasing port and the port for ball screws will match
inside the main unit.
Connect the controller and adjust it to the home position.
Insert the tip of the spray grease in greasing port and inject it for one second.
One injection time should not exceed one second.
[Whirl-stop]
Adjust the rod position above 40mm.
Insert the tip of the spray grease in greasing port and inject it for one second.
One injection time should not exceed one second.
(3) Clean up the rod (sliding surface) and apply the grease with hands.
(4) After greasing, move the rod full-stroke to apply the grease thoroughly.
Caution: Supplying too much grease may increase sliding resistance and load to the motor,
resulting in a drop of performance.
・In case the grease got into your eye, immediately go see the doctor to get
appropriate care. After finishing the grease supply work, wash your hands
carefully with water and soap to rinse the grease OFF.
Slim Hexagonal
Socket Head Bolt
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