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New Holland 451 mower

I rebuilt mine a few times over the years. Tried to go cheap the first time and paid in the end. The two plates that all the bearings attached to should be replaced. The originals were a thinner metal that can fatigue. Also check the races of the bearings for cracks.
 
I just bought a 1982 NH451 mower and installed a new sickle section and guards as well. The new sickle section was kind of tight going in, but after grinding the dome off the rivits it fits much better except the first tooth (closest to the tractor), which is getting really hot from friction against a serrated metal plate that the first tooth sits on. There doesn't seem to be any adjustment to the plate. I"m concerned about getting the new section too hot and ruining the bearings or breaking the section. Is hot typical until it gets run in for a while? All the rest of the teeth and guards seem to be fine. Any thoughts are appreciated, I'm a newby to this.
 
There"s shims that you can put between the metal bar for the sickle and the cutting head. This will lift the sickle very slighly and remove the friction/heat. Typically you find it the other way and you have too much clearance there and the sickle won"t cut good. I removed all my shims and still can"t get it close enough to be perfect but she cuts good so I"ll leave it. Should be able to find those shims at any NH dealer.
 
Hello,

I also have a 451 to rebuild and have several questions.

Did you replace the race and bearings for all the "dogbones"?

Where did you purchase your rebuild parts? Are there timken bearing equivalents?

Any specifics would be great.


James.
 
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