Leroy-Somer — Reassembling the motor
Repair & overhaul · Motor assembly
From a Leroy-Somer service manual — check it applies to your exact model before use.
Before you start
- Tighten shield fixing nuts diagonally to the recommended torque.
Procedure
- Check seals position and replace if in poor condition.
- Insert inner bearing retainers and spacer rings on the shaft if necessary.
- Mount new bearings on the shaft (cold or hot per section).
- Fit circlip(s), insert rotor in stator, pass tie rods if fitted.
- Position preloading washer with grease at back of DE bearing cage.
- Run connection cables through, refit DE shield with lifting system.
- Position NDE shield on rods/pins and push against stator.
- Semi-tighten shield screws, check alignment, then tighten nuts diagonally to torque.
- Fix bearing retainers, screw in DE/NDE valves and tighten grub screws.
- Check rotor turns freely with no axial play.
- Refit grease traps, terminal box support plate, terminal box and terminal plate.
- Wire up terminal plate to tightening torques.
- Refit forced ventilation unit and encoder (check drive shaft out-of-round).
- Replace shaft extension key.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Encoder drive shaft out-of-round max 0.03 mm
- Shield torque per section 6.4
Source: Leroy-Somer service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.