Leroy-Somer — Replacing the bearings on two-bearing machine
Repair & overhaul · DE and NDE bearings
From a Leroy-Somer service manual — check it applies to your exact model before use.
Before you start
- Do not use an oil bath to heat the bearings.
Procedure
- Uncouple the alternator from the prime mover.
- Remove the air ducts (3).
- Remove the assembly screws.
- Remove the DE bracket (30).
- Remove the NDE bracket (36).
- Remove both antifriction bearings (60) and (70) using a puller with a central screw.
- Heat the new bearings by induction or in a drying oven at 80°C (do not use an oil bath) and fit them.
- Check that both preloading wavy washers (79) have been fitted on the NDE bracket (36).
- Refit the DE bracket (30) and tighten the fixing screws.
- Replace the air ducts (3).
- Check that the alternator assembly is correctly mounted and that all screws are tightened.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Bearing heating 80 °C
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.