Fanuc Robot 420 I

Warning: This procedure requires trained personnel with PPE!

J1-axis motor connectors removed?

New motor installed and flange polished with oil stone?

LOCTITE No. 242 applied to the thread of the nut?

Check whether the cable connected to the teach pendant is unevenly twisted

If the ventilation portion of the control unit is dusty, turn off power and clean the unit

Check whether the jackets of the mechanical unit cables are damaged

Check whether the cables are excessively bent or unevenly twisted

Check that the connectors of the motors and connector panels are securely engaged

Clean each part (remove chips, etc.) and check component parts for cracks and flaws

Further tighten the end--effecter mounting bolts and external main bolts

Select the parts where grease was replaced

Refer to item 3.2 for required positions for greasing

Sign off on the 3 Yearly Checks

Warning: This procedure requires trained personnel with PPE!

Set the posture of the wrist such that no load is applied to the wrist axis

Remove four bolts (M12 x 40 2pcs, M12 x 55 2pcs) for mounting the motor, then the motor

Remove the nut and take out the center gear

Replace the motor with a new one. And reassemble it in a reverse order. Also replace the O--ring (as a precaution). Apply Locktite No. 242 to the threaded portion of the motor shaft. Be sure to mount the O- -ring at the appropriate position. Pay special attention so as not to scratch the tooth face of the super gear

Ventilation plug for J5-axis removed

New grease applied from the grease inlet until it comes out from the grease outlet

Plug at the grease outlet remounted

Sign off on the grease replacement