Doosan — Replacing the NDE bearing (alternator)
Repair & overhaul · Alternator bearing
From a Doosan owner's manual covering: G265, G265XW/XF, G300, G300XW/XF, G335, G335XW/XF, G400, G400XW/XF, G430, G430XW/XF, G435, G435XW/XF…. Check it applies to your exact model before use.
Applies to: Doosan P126TI engine, Doosan P126TI-II engine, Doosan P158LE engine, Doosan DP158LC engine, Doosan P180LE engine
Before you start
- During warranty, dismantling must be done in an approved workshop.
- Change antifriction bearings, O-ring seal, preloading washer and adhesive paste.
Procedure
- Remove box lid, NDE panel and the 2 screws from part (122).
- Disconnect stator outputs T1 to T12 and auxiliary winding wires AREP (X1,X2,Z1,Z2).
- Disconnect exciter wires (5+,6-).
- Remove air inlet louvre (51), bearing thrust screws (72) and all 4 screws (37).
- Remove shield (36), take out bearing (70) with a puller.
- Fit new bearing after heating by induction to approximately 80°C.
- Mount new preloading washer (79) + new O-ring seal (349) and coat bearing seat with adhesive paste.
Tools required
- Ratchet spanner + extension Amazon
- Torque wrench Amazon
- Flat spanners 8/10/18 mm Amazon
- Socket set 8-30 mm Amazon
- Puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Heat bearing to approximately 80°C by induction
Source: Doosan owner's 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.