Main Motor Removal - Hitachi NEXT Series Service Manual

4.19 Main motor removal

Prepare the additional 2×M16 eyebolts for this procedure.
4.19.1 Main motor removing for the fixed speed type.
① With hanging the motor by using a motor eyebolt, remove the 8×M16-45 bolt for the gear casing and shaft seal
cover, and remove the 2×M16-80 for the motor and base plate
② Screw the 2×M16 stud bolt into the removal holes, and remove the shaft seal cover from the gear casing using the
2×M16-80 bolt. 2×M16-80 bolt shall be tightened slowly and evenly.
③ When the shaft seal cover is removed from the gear casing, change the 2×M16-80 bolt to 2×M16 eyebolts. Hang the
motor by three eyebolts so that motor can keep the horizontal situation.
④ Move the motor for ODE side until bull gear can be seen.
⑤ Remove the motor. If you want to remove the motor for horizontal direction, lift the motor by crane so that shaft seal
cover does not hit the motor base.
①
8×M16-45 bolt
Gear Casing
Shaft Seal Cover
③
Gear casing
⑤
Eyebolt
2×M16-80 bolt
2×M16-80 bolt
(Hang the motor by three eyebolts)
2×M16 eyebolts
Shaft seal cover
Motor base
Confidential to Customer
55kW Motor Weight : 864 lbs (392 kg),
75kW Motor Weight : 1186 lbs (538 kg)
Gear casing
②
④
Gear casing
46
2×M16 stud bolt
2×M16-80 bolt
Bull gear