Leroy-Somer — Reassembly PLS 250 and PLS 280 SC/MC/MD motors
Repair & overhaul · Motor assembly
From a Leroy-Somer service manual — check it applies to your exact model before use.
Before you start
- MAKE SURE the fan is facing the right way
Procedure
- See section 6.1 before reassembly
- Insert inner bearing retainer (33) at drive end and (53) at non drive end
- Fit the new bearings on the shaft and mount circlip (60)
- Insert rotor (3) into stator (1) taking every precaution not to knock the winding
- Use rods in the retainer tapped holes to maintain grease nipple position
- Position preloading washer (59) with grease and remount NDE shield (6)
- At non drive end fit seal (54) and support (388), insert retainer (52) and screws (62)
- At drive end fit shield (5) positioning bearing retainer (33) correctly
- Mount mobile valve (35) after mounting seal (39) and support (386)
- Mount seal (54) NDE and seal (39) DE with grease
- Mount outer bearing retainer (32) with screws (40), grease drain hole at the bottom
- Place tie rods (14) including protective cover feet (380), tighten nuts diagonally
- Install fan key and mount fan (7) facing the right way
- Check free rotation, replace cover (13), grease nipple (64) and extension (65)
- Tighten rod nuts diagonally to torque, fill new grease, replace key (21)
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten tie rods diagonally to recommended torque (section 6.1)
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.