656 Bull Pinion Shaft Seal

I posted this over the weekend with no response so I thought I would try again.
The Bull pinion shaft seal is leaking pretty bad on our 656. I read about pulling it apart and shimming the bearings and putting a new seal in. Does this usually fix the problem or do I also need to consider new bearings? Its a 10K hour machine, and the rearend has some noise so I assume things are fairly worn. I dont really want to get into more than I have to since its spring and I am busy.
 
About all you can do is pull the brakes off and housing holding bull pinion in and see what that bearing looks like,and if it is ok, take enough shims out so shaft doesn't have and up and down movement but with no amount of load on bearing, then replace seal. If you have bearing and or gear failures you will find filings in the hydraulic filter.
 

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