Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Implement Alley Discussion Forum

New Holland 451 mower

Welcome Guest, Log in or Register
Author  [Modern View]
Earl Borchardt

05-21-2012 05:42:11

Report to Moderator

Rebuilding a 451 mower. Any words of wisdom?
Please comment on adjustments. Thanx Earl

[Log in to Reply]   [No Email]

06-26-2012 19:10:05

Report to Moderator
 Re: New Holland 451 mower in reply to Earl Borchardt, 05-21-2012 05:42:11  
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.


[Log in to Reply]  [No Email]
Farmer Steve

05-21-2012 06:33:38

Report to Moderator
 Re: New Holland 451 mower in reply to Earl Borchardt, 05-21-2012 05:42:11  
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.

[Log in to Reply]  [No Email]
Keith Jacobson

05-21-2012 14:41:33

Report to Moderator
 Re: New Holland 451 mower in reply to Farmer Steve, 05-21-2012 06:33:38  
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.

[Log in to Reply]  [No Email]
Farmer Steve

05-22-2012 06:41:33

Report to Moderator
 Re: New Holland 451 mower in reply to Keith Jacobson, 05-21-2012 14:41:33  
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.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2016 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters