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Farmall BN, two questions

K

kopeck

Member
I'll start with the most serious of the two.

I had my BN out pulling the log splitter last weekend. It started and drove fine, I split some wood then started it again to let it warm up while I cleaned up.

As it was sitting there it started making a thumping/knocking noise. It sound like it was coming from the front of the transmission. I jumped on an put the clutch in and the noise stopped, let the clutch out it was back. Since I was pretty close to home I figured I would just drive it back to the garage and figure it out from there. By the time I got back, maybe just 1/8 of a mile, probably a little less the noise was gone and everything seemed fine again? Any ideas, should I be worried?

Second is my lower radiator hose it leaking. It's really old, all bulged out and cracked. It only leaks on really cold days, which we've had all week. What size hose do I need? I've replaced them on other tractors I just can't remember the ID.

Thanks,

K
 
The noise has me baffled. There isn't much moving in the transmission when idling in neutral. Are you in a cold climate? I wonder if there was a piece of ice in there that got stirred up then broken up.

Per the book, both radiator hoses are 2" ID by 2-1/4" long.
 
(quoted from post at 09:01:51 01/25/13) The noise has me baffled. There isn't much moving in the transmission when idling in neutral. Are you in a cold climate? I wonder if there was a piece of ice in there that got stirred up then broken up.

Per the book, both radiator hoses are 2" ID by 2-1/4" long.
Click to expand...


Yup, up in Maine. I thought of ice too, I changed the oil a few years ago and it really doesn't stay out side (ie no rain) but maybe condensation? I guess I'll have to keep an ear open. It went away just about as fast as it came on.

Thanks for the measurements. Not sure if I want to go fight with it until is warms up a bit though! :)
 
The next time you go to use it loosen the drain plug in the rear end and slowly unscrew it to check if you have any ice in the bottom of the rear end. I had a H one time that would not move, just kill the motor when you let the clutch out. Got it thawed out and drained out just about three gallons of water.

Bob
 
(quoted from post at 09:23:02 01/25/13) The next time you go to use it loosen the drain plug in the rear end and slowly unscrew it to check if you have any ice in the bottom of the rear end. I had a H one time that would not move, just kill the motor when you let the clutch out. Got it thawed out and drained out just about three gallons of water.

Bob
Click to expand...

I'll give that a try. I'm pretty sure my SM has this problem. last time I check the oil is seemed to have gained some, not lost it. I just haven't gotten around to buy the tanker full of gear oil to replace it!

The only thing that turns when it's in neutral is the input shaft, right? I mean if a bearing went on it bad enough to make a knocking noise it's wouldn't just fix it's self...

K
 
One thing that I have done to save a little money is to drain the oil and put it in pails and let it set in the shed, and then let the water seperate over summer and when winter comes pour the oil out and any water will have become ice. I then run it through some cloth to get any metal filings out and then put it away till I need some oil
 
The only thing that turns when it's in neutral is the input shaft, right? I mean if a bearing went on it bad enough to make a knocking noise it's wouldn't just fix it's self...
Click to expand...
The input shaft, which has a bearing on each, end turns. If the PTO is engaged some more stuff in the back is turning (which I assume not in this case). However, the oil slinger gear is also turning. It is geared to the top shaft and should free-turn on a bushing on the lower shaft. It may be the surce of the problem. The oil slinger is a light-weight die cast gear. If it started loosing teeth, it would get pretty loud. But the material is soft enough that it could get ground up. Once all the teeth are gone, it could quiet back down. Some ice around it could be enough to cause it to strip some teeth. If you pull off the top cover, which is no big deal on this model, you will be able to inspect the oil slinger and related parts.
 
May want to check the countershaft oiler gear sometime. (The aluminum one). Seen them have all the teeth knocked off from ice damage.
 
Sounds like I have something to look at now.

This old BN ('45) has a pile of little things wrong, none too serious but it always starts and runs well, it always amazes me.

It really should go in the garage for an entire overhaul but it's my go to machine....

K
 
well, if the gear lube in the tranny and PTO have not been changed in awhile, it doesn't take that much, and is a good investment.
 
(quoted from post at 06:23:33 01/26/13) well, if the gear lube in the tranny and PTO have not been changed in awhile, it doesn't take that much, and is a good investment.
Click to expand...

I think the oil is 2 years old, 3 tops.

I'm not sure how water would have got in, it's stored under cover. The only way would be condensation.

K
 
well, then the lube is not old and dirty. There is a carrier bearing at the front input of the tranny. Could be going bad. Could have had grit in it. Could be a number of things.......some not too bad, some worse as they would require opening up the tranny and replacing bearings.

before you go to far, at least take the top off and see what she looks like inside. Yes, condensation can be an issue.
 
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