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Implement Alley Discussion Forum

Modern Mower Deck Question, Tightening Bearings?

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Driz

08-25-2006 18:20:47




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Everything is busted at my place. I have a 10 year old Hardee mower. Its a 5' finish that blew the bearings last summer. I rebuilt it and have had problems with the bearings seizing again on 2 occasions with 2 different shafts. This mower uses tapered bearings rather than the regular sealed type. I hand packed the bearings, installed them then filled the cavity with marine wheel bearing grease via the zerk. They aren't under pressure just pretty full and I tightened them as with any new bearing I know of. Tighten to slight bind then back off to easy roll with no binding. Am I using too much grease of do these have to be set super loose? The decks original bearings lasted 12 years with no grease at all as they hid the zerks so well I couldn't find them and thought they were sealed.

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mowr

08-27-2006 21:29:37




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 Re: Modern Mower Deck Question, Tightening Bearing in reply to Driz, 08-25-2006 18:20:47  
It sounds to me like they are still ending up with some preload; no clearance. The way I learned to set up most tapered roller bearings is as follows: turn nut with fingers only, until you just start to feel resistance, then back off to first castle and install cotter pin. This gives the rollers just enough clearance to keep from squeezing all the grease out from between them and the cup (resulting in a dry bearing). In 35 years I haven't had one go dry yet, knock on wood (my head, ha). Might be worth a try.

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driz

08-25-2006 23:51:10




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 Re: Modern Mower Deck Question, Tightening Bearing in reply to Driz, 08-25-2006 18:20:47  
Its the standard wheel bearing type with the castle nut and drilled spindle. Nothing unusual there. In fact the spindle is nothing more than a trailer wheel assy for a utility trailer with a different shaft where the axle goes. Worth knowing if you ever have to replace one.



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Blue Buddy

08-26-2006 06:07:49




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 Re: Modern Mower Deck Question, Tightening Bearing in reply to driz, 08-25-2006 23:51:10  
kinda seems ya have the right plan, make sure the seals are set with the lip out so when yu pump in grease, and extra can escape, lots of times an oil seal is used on these, and people install em as for oil, when you use em with grease yu need to turn em around, garter spring out, unless yer not gonna grease em at all other suggestion is when ya initially tighten the bearing, tighten it right down quite snug to seat the bearings, then back it off and give the end of the shaft a little hammer tap to make sure the bearing backs off with the nut as it moves, sometimes the bearing is tight enough to the shaft that when ya move the nut the bearing does not move well with it, and set them with just the very slightest drag, basically just remove all the endplay and a wee touch more

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504-1

08-25-2006 20:01:00




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 Re: Modern Mower Deck Question, Tightening Bearing in reply to Driz, 08-25-2006 18:20:47  
What kind of lock nut? There has to be some way to keep the bearing lash from changing. If it has a poly lock nuts try some new ones. kjm



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