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If I recall correctly on one of Toms booms the bull gear had collected probabley what was fine dust mixed with grease which clung to the gear .Even though that gear is some what encased that damned dust can filter in .Perhaps that subject is covered in the maintainance manual of PM's .

I'm no expert on it but here's what I've seen .The pinion gear can waller out the keyway on the gear causing a lot of slop .That slop will cause the bearing in the top portion or the one next to the pinion to get sloppy which could play havoc with the internal gears of the hydra motor .Just the...