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.
- Thread starter Cahillj
- Start date
Steve Brussell
Member
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).
Mike(NEOhio)
Well-known Member
- Location
- Newbury, Ohio
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.
Jim.ME
Well-known Member
- Location
- central ME
This should help with your NAA anatomy questions.
showcrop
Well-known Member
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.
Sean in PA
Well-known Member
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.
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