Welcome! Please use the navigational links on your left to explore our website.

Company Logo Shop Now
   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
Ford Tractors Discussion Forum
Order Ford NAA Parts Online

Cotter pin, bottom of transmission/differential? NAA, oil le

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

09-29-2019 18:51:46

Report to Moderator

Just noticed a significant oil leak in my Ford NAA. There is a cotter pin with the two bent ends sticking out from a hole under either the transmission of differential, not sure which. Oil seems to be seeping out. I have a short owners manual with a diagram and if you look close the cotter pin is shown. In the cut away view it is just forward of a drain plug that is directly below shift lever. First question, in the cut away there is a large area with what appears to be two drain plugs and is directly below steering gear box, cotter pin appears to be just at the far rear end of this area just before a wall which divides to next compartment back that has all the gears. Is this area the differential and next back transmission? What is the purpose of the cotter pin and what can I do about leak and finally what sort of fluid should I use. I have read of something that seems to be useable in hydralics, transmission and differential. Thanks all for any help on my NAA anatomy questions.

[Log in to Reply]   [No Email]
Sean in PA

09-30-2019 04:58:13

Report to Moderator
 Re: Cotter pin, bottom of transmission/differential? NAA, oi in reply to Cahillj, 09-29-2019 18:51:46  
The differential is in the center of the rear axle, under your rear end when you're sitting on the tractor.

As others have said, that area with the cotter pin is the bell housing where the clutch resides. That area is supposed to be dry, but can get fluid in it if the front of the transmission or the rear of the engine leak, and the hole with the cotter is there to let any fluids that get in there to have a place to drip ot so the clutch doesn't get contaminated with oil. The cotter pin itself is supposed to be a loose enough that it rattles around from the vibrations of the tractor running to keep the hole from getting clogged up with dirt and mud, so the hole stays open.

[Log in to Reply]  [No Email]

09-30-2019 04:11:52

Report to Moderator
 Re: Cotter pin, bottom of transmission/differential? NAA, oi in reply to Cahillj, 09-29-2019 18:51:46  
As already said, the hole and cotter pin are there to keep the leaking oil from accumulating enough to keep your clutch from slipping. You will need to split the tractor to renew the leaking seal, whether it is the transmission or engine seal so you may want to live with it until it gets really bad. The fluid that you are asking about is called universal tractor fluid, however, your NAA, which has no wet brakes or clutch packs to protect needs only cheap hydraulic oil.

[Log in to Reply]  [No Email]

09-30-2019 03:32:32

Report to Moderator
 Re: Cotter pin, bottom of transmission/differential? NAA, oi in reply to Cahillj, 09-29-2019 18:51:46  
This should help with your NAA anatomy questions.

[Log in to Reply]  [No Email]

09-29-2019 21:55:24

Report to Moderator
 Re: Cotter pin, bottom of transmission/differential? NAA, oil le in reply to Cahillj, 09-29-2019 18:51:46  
That's a weep hole for condensation and the cotter pin is there to jiggle around and keep the hole from plugging up. The housing is dry. Any oil would be either the rear main crankshaft seal or the transmission front seal.

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

09-29-2019 19:28:46

Report to Moderator
 Re: Cotter pin, bottom of transmission/differential? NAA, oi in reply to Cahillj, 09-29-2019 18:51:46  
cotter pin is meant to be there to keep bell housing clutch area free from being contaminated with leaking oil. You either have a rear main oil seal leak (engine oil) or a transmission leak( tranny fluid).

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

Hop to:

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums

Copyright © 1997-2020 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

Website Accessibility Policy