YASKAWA Motoman GP50, Maintenance Manual

Page: 34 / 109

5 Disassembly and Reassembly of the Motor
5.1 Disassembly and Reassembly of the S-Axis Motor
5-2
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5.1 Disassembly and Reassembly of the S-Axis Motor
• Refer to fig. 5-2(a) “Disassembly and Reassembly of the S-Axis
Motor” .
 Disassembly
1. Turn OFF the power supply of the YRC1000.
2. Remove the encoder connector of the S-axis motor (fixing bolt:
pan-head screw M2), and then disconnect the encoder cable.
3. Turn the connector on the cable side of the power connector for the S-
axis motor , and then disconnect the power cable. If the connector
does not turn, remove the connector by holding the connector on the
cable side with a pair of plastic pliers etc.
4. Unscrew the hexagon socket head cap screws , and then remove
the S-axis motor and the motor base from the S-head by using
the tapped holes on the motor flange face.
5. Unscrew the hexagon socket head cap screw , and then remove the
gear , bearing , key , and retaining ring .
6. Unscrew the hexagon socket head cap screw and remove the M-
base and the oil seal .
 Reassembly
1. Apply ThreeBond 1206C to the contact surface of the S-axis motor
and the motor base , and then mount the motor base and the oil
seal on the S-axis motor . Mount the motor base so that the
hexagon socket head plug is in the position shown in the figure (
symbol). For the place to apply sealing bond, refer to fig. 5-2(b)
“Surface to Apply Sealing Bond on the S-Axis Motor” .
2. Tighten the hexagon socket head cap screw with the tightening
torque shown in table 5-1 “S-Axis Motor Parts Checklist” .
3. Apply MP-1 grease to the lip part of the oil seal .
4. Mount the gear , bearing , key , and retaining ring on the S-
axis motor .
5. Pass the hexagon socket head cap screw through the conical
spring washer, and apply LOCTITE 243 to the thread part of the screw.
Tighten the screw with the tightening torque shown in
table 5-1 .
6. Apply ThreeBond 1206C to the contact surface of the motor base
and the S-head, and then mount the S-axis motor on the S-head.
For the place to apply sealing bond, refer to fig. 5-2(c) “Surface to
Apply Sealing Bond on the S-Axis Spacer” .
7. Tighten the hexagon socket head cap screws with the tightening
torque shown in table 5-1 .
8. Connect the encoder cable to the S-axis motor , and then tighten
the connector fixing bolt (pan-head screw M2) with a tightening torque
of 0.2 N•m.
(The connector fixing bolt is provided with the connector.)
9. As shown in fig. 5-2(e) “Motor Power Cable” , insert the power
connector to the S-axis motor by aligning the key position, and then
turn the coupling nut on the cable side until it makes a clicking sound.
Confirm that the arrow marks on the connector on the motor side and
the connector on the wiring harness side match.
10. Turn ON the power supply of the YRC1000.
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