Need help with NH 450 mower

mcg · Jun 1, 2017

I have a New Holland 450 sickle mower. The pulleys don?t align, and it seems like the wobble box ,blade and pulley are tilting to the front. I?m thinking the pin that the wobble box pivots on isn?t the right pin, but I can?t find the pin using the New Holland parts book online. Does anyone have the part # for this pin, the parts book shows a bushing there, but I can?t find the pin. Also, I don?t know if there is any way to adjust anything to get rid of this tilt. I have a reprint of the owners manual, but it isn?t much help.
Thanks for any suggestions.

old · Jun 1, 2017

Have not had to tune up my friend NH450 yet this year so been a year since I messed with it. I would check the bearing there and make sure it is not pretty much gone and yes the pin there need to be a snog fit. I had to replace all the wobble box parts on his last spring before he could mow hay with it.

Traditional Farmer · Jun 1, 2017

Looks like a piece of the frame would have to be bent somewhere.I'd detach the cutter assembly,line it up straight and that will show you which frame pieces is bent.You may have to drill out and rebush the worn pin hole.

PJH · Jun 1, 2017

I don't think the slop in that pin would throw the belt out of alignment that bad. The pin looks like it needs attention for sure, but I wonder if the heavy push bar has been bent somehow. On my NH 451, there is a one-bolt adjustment to rotate the push bar. Has that adjustment came loose and allowed the bar to rotate the guards downward? The adjustment bolt is just in front of the drive pulley that's attached to the PTO. It has a plate under it with a bunch of serrations to keep it from slipping. This is a copy of the page from my 451 manual. Your 450 may be different.

Need help with NH 450 mower

mcg

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old

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Traditional Farmer

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PJH

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