How to refurish the drive

pgm944

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Bolen/MTD has used this drive for 30 years, but I am new to how to fix/adjust it.

Bolen-MTD 15HP Briggs & Stratton with 38in deck.
Model 13AM662F765
S/N 1D304B80323 001

Just bought it used. Engine starts fine... possibly has been replaced, as the wiring looks brand new.
Speed is troublesome.
No reverse.
Forward, only in 6th - high speed - and then it sometimes goes like a banshee, sometimes, just lugs.

OK - I can replace belts, but it seems as the pulley does not smoothly pull in/out.
What should I be looking for to clean/grease?
Any YouTube videos as to how refurbish it?
 

SeniorCitizen

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The one I repaired for a neighbor I polished the shaft with 600 wet/dry sand paper and lubed the shaft by rubbing a graphite led pencil on the shaft before assembly. That along with new bearings and thrust washers completed the repair.
 
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