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Implement Alley Discussion Forum

NH 469 Haybine problem

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Snue

07-09-2005 14:40:35




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My husband asked me to post this...

His NH 469 has been giving him problems lately and he can't seem to diagnose what is causing the problem.

Seems that when he mows he is forever shearing off the bolt that holds together the cutting bar to the wobble assembly. This is a hardened bolt about 3 1/2" long. And it's always only this bolt that gets sheared off. If the bolt holds up, then the haybine blows out the bushing at the juncture of the wobble assembly.

He's was informed the problem lay in the guards, that they were old and worn and not allowing the knives to run smoothly, so he recently purchased and replaced all the guards, yet the problem still exists. And he's running out of ideas on what next to check.

HELP!

Sue

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Bob/wis

07-10-2005 04:27:28




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  
FIrst thought to me is can you pull the sickle out through the guards easy? If not the guards are not inline and are binding up the sickle. That is a big cause of this failure. I have put alot of hours on our 469. The sickle must be free to move or it breaks. I ha dthis problem a couple of years back. Went through and made sure all the guard where in iline to allow me to slide the sickle in and out by hand with hardly and force. Also a little oil on the sickle and gaurd area helps get hings loosen up in the first time out for the year too.
Bob

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Farmer Gene (NW WI)

07-10-2005 02:07:54




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  
It"s been awhile since I"ve owned a 469 but it seems I remember reading in the manual that the sickle bar has to be indexed when you put it in, the bolt has to be exactly centered in the access hole and don"t allow the sickle to move while you tighten it. Also check to make sure you have enough hold down clips and that they are adjusted properly, also check the back of the sickle for wear, take a screw driver and try to move the sickle towards the guards, shouldn"t have much movement.

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Matthew(Mich)

07-09-2005 17:42:06




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  

Had the same issue with my 469 a few years ago. On the wobble drive there is two bearing caps one per side each have a grease fitting. Unscrew the two bolts that hold the bearing caps on. There are plastic shims in between the bearing cap and housing. Remove all the shims and put the caps back on that will tighten up those bearings. Solved my problem and haven't lost a bolt or bushing since.

Matthew

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Snue

07-09-2005 15:37:45




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  
Thanks folks!

Nothing like experience or "been there done that" to get to the root of a problem.
I'm sure he'll be happy to hear of the options posted. He has a buddy who owns a machine shop so he shouldn't have any problems along that route in getting something done if needed!

You are great!!!!

Sue



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DMK-mn

07-09-2005 15:15:17




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  
sounds to me like you have a bearing out in the wobble box or possible not having the sickle centered on the wobble box arm.

just experience talking

good luck



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ErnieDD

07-09-2005 15:04:23




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 Re: NH 469 Haybine problem in reply to Snue, 07-09-2005 14:40:35  
Excess clearance is the problem. You have wear in the bushing in the cutter bar or the flat with the fitment the bolt is in. Take a new bolt and check for wear in either hole. We used to use an extra long bolt and cut the threaded end off so there would be extra shoulder for strength. Put a little grease on everything and assemble tight. Double nut to lock the nut against a flat washer.

You do want to use a grade 8 bolt, and not much fun to cut down. A machine shop can turn down a bolt to make it fit tighter.

The cutter bar connection was a trip through the woods in the design department.

Check for broken bolts in the conditioning slip clutch.

Oil the wire rope that connects the tensioning springs to the hand crank.

Be sure to check the bearings on the conditioning rollers, if they spin on the shaft it is a big repair. Ours went out and we found a machine shop to make bushings for the bearings. That was 30 years ago. Always liked the 469. Ran rings around our neighbors self propelled Owatanna. We cut for him one day and he went out and bought a new self propelled New Holland.

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roper6365

07-09-2005 17:42:40




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 Re: NH 469 Haybine problem in reply to ErnieDD, 07-09-2005 15:04:23  
I'v got a 467 with the same problem. I'v gone thru a few bolts in the past couple of weeks. I won't use a Grade 8 bolt only because i'm not sure what the problem is and I know it won't be easy to find other parts if they break so I use grade 5 with a compression nut. If you have a impact wrench thier not bad to put on, in the field you'll need a long extension to help put them on. Both times it has broken has been when I'm dropping the head, It may have nothing to do with it but I'v been carful to put it down slowly since the last break.

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