Leroy-Somer — Dismantling PLS 355 and PLS 400 motors
Repair & overhaul · Motor assembly
From a Leroy-Somer service manual — check it applies to your exact model before use.
Before you start
- Discard the bearing after heating the inner bearing ring
- If end shield probes are fitted, switch off the terminal box probes and push wires into the motors before removing the shields
Procedure
- Take off the shield strap(s) (114) after removing the screws
- Take out the shaft extension key (21)
- Unscrew the DE and NDE shield (5) and (6) fixing screws
- Unscrew the inner bearing retainer (33) and (53) fixing screws
- Unscrew the labyrinth seal (257) fixing screws and dismantle it, applying gentle heat if necessary
- Using a bronze drift and a lifting block, take off shields (5) and (6); recover preloading washers or springs (59)
- Lift the tabs off the DE and NDE brake nut and unscrew the lock nuts
- Remove the deflectors from the DE and NDE grease valves (35) and (56)
- Take out the bearings with an extractor, separately or with the bearing retainers
- Remove the rotor with its fan from the stator at the non drive end
- To dismantle the fan: lift the tab, unscrew the nut, heat the fan hub and pull it out
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.