Center Pivot motor replacement

Categories: Operation and Maintenance

center-pivot stator kit

Before explaining the steps of installation – replacement, we must note that the original stator (motor winding) that is thermally protected and heat treated, has longer life than a conventional winding.

Installation instructions


Safety is the first thing, so there’s to be familiar with the equipment and read the manual thoroughly before working. Always disconnect electrical power at the motor starter, fuse box, or circuit breaker before handling electrical connections.

Double check to confirm that power is off and that it cannot be restored prior to completion of the repair work.

Use qualified electricians, proper electrical practices, wiring, and controls consistent with local and national electrical codes. Confirm that center-Pivot system is properly grounded.

Refer to motor nameplate for proper power supply requirements. Confirm that connections are tight and adequately taped to prevent shorts and moisture intrusion. Confirm that all fasteners are secure.

Keep tools, clothing and hands away from rotating or moving parts while equipment is in operation. Practice good safety habits at all times to avoid injury, for example, wear eye protection when inspecting equipment.

Stator kit installation procedure

After disconnecting power supply to the motor, remove the motor conduit box cover and remove wire nuts from motor and power supply leads. Disconnect the ground lead.

Remove the three long bolts holding the motor to the gear case. Remove the stator, leaving the rotor and shaft undisturbed.

Prior to assembly, remove any remaining sealant from the gear case register. Also, remove any excess rust or corrosion from the rotor core surface with emery cloth, then treat rotor core surface with a light coat of corrosion resistant oil.

Apply new sealant, supplied with kit, to the gear case register. Apply sealant to the full circumference of the gear case register.

Remove the wavy washer from the old motor bracket. Apply grease to the wavy washer prior to placing it in the bottom of the bearing bore of the replacement motor bracket.

Prior to positioning the replacement stator assembly over the existing rotor assembly, carefully examine the stator assembly for internal lead wire positioning by looking into the open end of the stator. Reposition leads, if necessary, to provide rotational and electrical clearance.

Align the bosses of braket with the gear case mounting holes. Insert and tighten the bolts evenly, alternating around the assembly until the motor frame seals securely into the gear case register.

Bring power cable into the motor conduit box, using a new cable gland. Tighten the new cable gland securely to avoid water intrusion.

Make power connections in the motor conduit box using new wire nuts. After tightening the wire nuts, wrap them with a good quality electrical tape. If the unit is used in a variable frequency inverter application, use Scotch 70 self-fusing tape in place of standard electrical tape. After taping is complete, position the wire nuts skirt down.

Connect ground wire, install outlet box cover being careful to avoid pinching leads or damaging the gasket, and confirm that both the cable and outlet box cover are tightened securely to prevent water intrusion.

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