Fanuc Robot S-420iL

Warning: Ensure the power is turned off before starting the procedure

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

Battery in the mechanical unit replaced?

Cables in the mechanical unit checked?

Each part cleaned and inspected?

Major external bolts tightened?

Balancer joint bearing greased?

Grease supplied to the bearing (only for the S--420i R)?

Filter elements in the air filter unit replaced?

1) Check the following items once every three months. Additional inspection areas and times should be added to the table according to the robot’s working conditions, environment, etc.

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

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

Check the following items at the first quarterly inspection, then every year thereafter.

Check whether the jackets of the mechanical unit cables are damaged. Also check whether the cables are excessively bent or unevenly twisted. Check that the connectors of the motors and connector panels are securely engaged.See section 7.2.

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.

Grease to the balancer bushing. Refer to item 3.2. in every 6 month;

1) Replacing the J2/J3--axis motor (M2/M3)

i) Standard type (See Fig. 6.3(a))

2 Suspend the J3--axis arm with a rope. Also, suspend the J3--axis link for safety. (See Fig. 6.3(c).) (For S--420iR, suspend it as shown in Fig. 6.3(d).)

4 Remove the mounting bolts (M12×40) of the motor to be replaced, and remove the motor to be replaced.

5 Remove the nut, the input gear and the draw bolt in order.

6 Replace the motor, and remount a new motor reversing the above procedure. Polish the motor flange with an oil stone. Apply LOCTITE No. 242 to the draw bolt and the motor thread. Mount the O--ring correctly. Use new motor mounting sealbolts. (In case of reusing sealbolts, apply LOCTITE No.242 to them. (Refer to section 6.1) Be careful not to damage the tooth surface of the input gear.

7 Replenish the grease (Refer to section 3).

1) Replacing J1--axis motor (Fig. 6.2 (a) )

2 Remove the J1--axis motor connectors. (For the S--420i R, remove the cover from the J2 angle base.)

3 Remove four motor mounting bolts (M12×35) and then remove the motor.

4 Remove the nut and gear in order.

5 Replace the motor, and remount a new motor reversing above procedure. Polish the motor flange with oil stone. Apply LOCTITE No. 242 to the thread of the nut. Be careful not to damage the tooth surface of the spur gear. Install an O ring correctly.

6 Perform mastering (Refer to section 5.3).

2) Replacing J1--axis reducer (Fig. 6.2 (b) )