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John Deere Tractors Discussion Forum
Show Parts for Model:

John Deere A Oil Pump, Fan Shaft, and Clutch

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T. Wall

01-04-2007 16:23:58

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I have a 1952 JD A and it has several problems. First of all when the tractor runs for about 30 min. or until the oil gets hot it loses it's oil pressure. For the first 30 min the pressure is very good bewteen M and H. After the oil gets hot it drops to low. I've tried different gauges and the line to the gauge is good. I've even read that if you tighten the oil filter to tight it could cause the oil pressure to drop, I've tried that as well. Could it be that oil pump has gone bad?

Next the fan shaft pinon race and bearings came to pieces this summer while I was running the tractor in the field. I stopped the tractor right then and pulled it to the barn. I replaced all the bearings and races in the governer as well as the pinon race and bearing. The fan shaft pinon bevel gear had a little damage from the race and bearing coming apart in the field. The gear had some nics on a few of the teeth not real bad, so I put the gear back on. Now when the tractor is running the gear is making a whinning noise. Is this because the teeth are damaged or could it be that the gear is to far in mesh with the governer gear causing the whinning noise?

Last of all the clucth is making a loud noise as well. I've haved that clucth apart 5 times and I still can't figure out why it's making so much noise. It's only when the clucth's engaged. The bearing in the clutch looks good as far as I can tell. But it might be worn out. Any Ideas why the clutch is making such a fuss?

Any help with these three things would be greatly appericated. Maybe I didn't ask to many questions.

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Mike M

01-05-2007 10:56:03

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to T. Wall, 01-04-2007 16:23:58  
On that oil filter make sure someone hasn't overtightened the filter and crushed the filter can or busted the filter head. If you know what a good one looks like sometimes you can spot a bad one by looking up into the filter can.

Have you tried playing with the oil pressure adjustment ? On the RH side under the belt pulley area there is a pipe plug. Take it out and there should be an adjustment screw right there. I'd try screwing it in some to boost the pressure and maybe even out some too incase something got lodged in it.

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T. Wall

01-05-2007 11:45:32

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to Mike M, 01-05-2007 10:56:03  
Mike M

I adjusted the oil pressure just like you have talked about and it will make the pressure go up, but as soon as the oil gets hot it goes back to low. I will check the filter head. Thanks for the help.

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Mike M

01-05-2007 12:03:48

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to T. Wall, 01-05-2007 11:45:32  
What kinda oil are you using ? IE synthetic 5W-30 or reg. old straight 30W or something inbetween ?

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T. Wall

01-05-2007 12:21:29

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to Mike M, 01-05-2007 12:03:48  
I'm using Penzoil HD 30W.

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Mike M

01-05-2007 12:39:57

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to T. Wall, 01-05-2007 12:21:29  
Shouldn't be the oil then. I've seen alot of tractors with distorted and/or crushed filter cans. I'd say yours is worth a long hard look. You may even have to pull the stem and upper filter plate out of the can to have a look at the top of it where the relief valve bolts on it. The I&T book shows a homemade tool to hook into this and pull it out.

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another thing to check ?

01-05-2007 12:47:42

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to Mike M, 01-05-2007 12:39:57  
It may not be a bad idea to pull off the engine top cover drain the oil and have a look around. Look for something not right like an oil line cracked or broken ? maybe leave alittle oil in there and turn the engine over and watch if any excess leaks out somewhere ? like the filter can top gasket ? It's going to be real hard to get to that relief spring as I think it is in the filter can head.

I had a late B that lost oil pressure not long after an overhaul it had a bad relief spring,but those models are on the outside and easy to get at. Lucky I didn't ruin the engine.

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01-05-2007 10:37:47

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to T. Wall, 01-04-2007 16:23:58  
Is the clutch driver tight on the crankshaft?

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T. Wall

01-05-2007 11:49:17

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to teddy52food, 01-05-2007 10:37:47  
Are you talking about the drive disk? The drive disk is very tight on the crankshaft.

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Paul from MI

01-05-2007 06:50:33

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 Re: John Deere A Oil Pump, Fan Shaft, and Clutch in reply to T. Wall, 01-04-2007 16:23:58  
Oil pressure drop is due to oil thinning as it heats. It may be from a worn or improperly assembled oil pump or something preventing the relief valve from closing completely or properly. Maybe a broken spring? How long has this problem existed? If it happened all at once I would suspect the relief valve. If it happened gradually, then it may be due to oil pump wear or worn engine bearings.
The whine in the governor is most likely due to the mesh of the gears. I"ve seen them pretty worn and run quiet as long as nothing changes the mesh, like installing new bearings, etc. You may have to play with the shims on the fan shaft to get it back as close as possible to where it originally ran. Those gears kind of wear in to each other and if the mesh isn"t the same you can get noise.
As far as the clutch, since the noise comes only with the clutch engaged, it could also be some thing in the trans. or first reduction gear. Does the noise change under load or in different gears? Does the noise change when the clutch is engaged and you put some resistance on the pulley? Hope this helps,

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T. Wall

01-05-2007 07:20:11

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 Paul from MI in reply to Paul from MI, 01-05-2007 06:50:33  
The oil pressure just dropped one day about 3 months ago. I've had the tractor for about 2 years now and it's had good oil pressure up to now. How hard is it to check relief valve or for a broken spring?

The clutch doesn't change noise in different gears, its the same in all gears. When under a load it probaly does get worse.


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