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Implement Alley Discussion Forum

NH 256 rake gearbox seal

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Lloyd C.

04-15-2008 08:57:22




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I recently acquired a very neglected NH 256 rake and need to replace the gearbox output shaft grease seal. I have both an operator's and parts manual that describes the disassemby and servicing of the gearbox but, can I replace the grease seal without a complete disassembly of the gearbox?
Also, plan to drill,tap and install zerk fittings at each end of the tine bars so that I can lube those so-called, sealed bearings. How do I keep the metal shavings from the drilling and tapping out of the bearing housings?

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hay

04-16-2008 04:40:23




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 Re: NH 256 rake gearbox seal in reply to Lloyd C., 04-15-2008 08:57:22  
i takes about two tubes of grease to fill the gearbox and then it's done. no more disassembley for seals or leaks and beside the NH recommends tube grease anyway. that's what i used and had no problem with it.



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Josh in WNY

04-16-2008 14:32:32




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 Re: NH 256 rake gearbox seal in reply to hay, 04-16-2008 04:40:23  
Keep in mind that you don't have to completely fill the gearbox with grease. As long as the lowest gear in the box it getting grease on it, the grease will be spread throughout the gearbox. Having too much grease can actually make the gearbox run hot since the heat can't dissipate (might not be a problem in this case since the gears are not turning that fast, but it is something to keep in mind).

Josh in WNY

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kyhayman

04-15-2008 21:38:39




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 Re: NH 256 rake gearbox seal in reply to Lloyd C., 04-15-2008 08:57:22  
I did what you describe on my tine bars. By all means, remove the bearings. Its well worth the effort to keep shavings out. It also lets you examine the bearings and replace any that are badly worn. Makes a lot bigger job of it but you know there isnt any metal pieces where they dont belong. All it takes is one chip to negate the benefits of the grease.

As to the gear box, its a total take down. I follow CNH's rec and use grease but replaced the seal anyhow.

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paul

04-15-2008 09:40:24




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 Re: NH 256 rake gearbox seal in reply to Lloyd C., 04-15-2008 08:57:22  
NH now recommends grease in the gearbox, and it likely is the easier way to go. New seal won't last all that long..... btdt

--->Paul



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Josh in WNY

04-15-2008 09:32:24




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 Re: NH 256 rake gearbox seal in reply to Lloyd C., 04-15-2008 08:57:22  
One option that might work for the gearbox is to simply replace the filler plug with a zerk fitting and pump some grease in. Saves you from having to completly disassembly the gearbox and works just as well. We did that to our model 55 several years ago and haven't had any problems.

Not sure of any way of keeping all of the metal chips out of the bearing housings unless you pull them off. Not totally sure, as I have never do it.

Good luck,

Josh in WNY

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reid5365

04-15-2008 13:40:41




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 Re: NH 256 rake gearbox seal in reply to Josh in WNY, 04-15-2008 09:32:24  
Hows that work on your 55?? I have one, do you just drain all the fluid and then how many tubes of grease do you put in???



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Josh in WNY

04-16-2008 14:28:35




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 Re: NH 256 rake gearbox seal in reply to reid5365, 04-15-2008 13:40:41  
I put about a half to 3/4 of a tube in the first time and then just give it a little extra each spring when I get it ready for the season. The seal in ours was bad enough that I didn't even have to bother draining the fluid, but it would probably be a good idea. I'm not sure how well the grease and the oil would mix together.

Josh in WNY



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JMS/.MN

04-15-2008 09:40:22




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 Re: NH 256 rake gearbox seal in reply to Josh in WNY, 04-15-2008 09:32:24  
Using grease instead of oil in the gearbox is NH"s current recommendation. Putting grease on the drill bit helps retain most chips, but no guarantee. Personally, I wouldn"t mess with it. A new bearing should last many years.



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