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A clutch fan

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Rick

09-05-2000 18:57:18




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We have a '52 A with a "clutch fan" (spring loaded between two hubs) that we are having problems with. I am considering drilling holes through both hubs and the fan and securing it solid. Any thoughts? What is the reason for the spring loaded fan? Safety? Thanks for you input.




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deerejon2000

09-05-2000 21:15:01




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 Re: A clutch fan in reply to Rick , 09-05-2000 18:57:18  
The clutch is a slip-clutch, supposed to allow the fan to slip if it gets caught on something. It didn't always work, I've replaced the timing gears in my uncle's tractor years ago because he got his coat caught in the fan (he threw it over the radiator to warm the tactor in the winter). The problem with bolting the hubs and fan together is that often the splined part of the hub has broken loose from the hub and would slip even if it was bolted to the fan.

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G Taylor don't bolt clutch together

09-05-2000 21:31:57




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 Re: Re: A clutch fan in reply to deerejon2000, 09-05-2000 21:15:01  
The clutch is required to absorb the shock of the two cylinder power pulses. Well meaning people in a hurry or on a budget have ruined the fan shaft drive gears with this "fix".



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Ed M.

09-06-2000 03:52:45




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 Re: Re: Re: A clutch fan in reply to G Taylor don't bolt clutch together, 09-05-2000 21:31:57  
I don't agree with the idea that that SLIP CLUTCH is a dampner. Most of those never move after they rust up & those tractors run for 1,000's of hours without tearing up the drive gears. The energy has already been put into the gears before is would slip. Some of the old H's had a rubber fan hub that could have absorbed energy but that only lasted 1 year.



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G Taylor

09-06-2000 18:43:38




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 Re: Re: Re: Re: A clutch fan in reply to Ed M., 09-06-2000 03:52:45  
The clutch plates do show signs of wear after several thousand hours. The purpose is two fold.#1 To slip if something jams the fan.#2 The plates only have to slip a fraction of a second of rotation to relieve the the peak dynamic stress. Good looking gears with a frozen clutch for two reasons. #1 the clutch wasn't rusted solid when the tractor was parked 20 to forty years ago.#2 Somebody put new gears in and only ran the tractor a few hundred hours at most.

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WTW

09-06-2000 07:05:28




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 Re: Re: Re: Re: A clutch fan in reply to Ed M., 09-06-2000 03:52:45  
Mr. Taylor is right, The purpose of the fan friction disk was to absord torsionnal shock and backlash to protect the bevel gears, no different than the original ruber type did. All my 1930 era tractors still have the original rubber drive in them and if the were ever to fail the company would send you the friction type to replace them. Like Mr. Taylor said it will last a little while if you bolt them solid and you still can buy new gears. When you see a set of fan/ bevel gears worn and beat to death good chance the friction drive had been seized up causing allot of what you see. A person can occasionaly (with tractor shut off) turn the fan and check that the parrts are not seized together.The reason most of them failed was because the aluminum drive plate would become seized to the splined shaft. My two cents worth. Dave W.

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Ed M

09-06-2000 16:22:15




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 Re: Re: Re: Re: Re: A clutch fan in reply to WTW, 09-06-2000 07:05:28  
I have never seen a friction disk used as a torsional damper. If those thin disks slipped every time the engine fired they wouldn't last very long. Also if the power pulses were a problem there would have been a damper put between the power steering pump & the gear set as that places more load on the system than the fan. I have pulled many old frozen solid slip clutches apart on old John Deere's & the bevel gear set was still like new so obviously those tractors didn't need a damper on the fan.

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Ron

09-06-2000 07:47:33




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 Re: Re: Re: Re: Re: A clutch fan in reply to WTW, 09-06-2000 07:05:28  
I just had the fan clutch all apart on my 50 as part of the cleaning and painting process. The spring strength requires a press or equivalent to get it apart. Sure seems to me like that heavy spring pressure wouldn't let any slippage occur from any uneven drive source. But then somebody must have figured out there was a need for it! (by the way I didn't let any paint get onto the spline area of the clutch disks or the shaft so they should still work exactly as designed)

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zane

09-06-2000 18:18:29




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 Re: Re: Re: Re: Re: Re: A clutch fan in reply to Ron, 09-06-2000 07:47:33  
Other makes of tractors had belt-driven fans. The belts drive through friction, and can slip--a feature that incidentally protects the driving mechanism in case the fan strikes an obstruction. The JD's probably had friction clutches on the fan drives for the same reason.



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Ray V

09-06-2000 18:46:51




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 Re: Re: Re: Re: Re: Re: Re: A clutch fan in reply to zane, 09-06-2000 18:18:29  
You folks have probably read this already, but just incase not. This is from my 36D Instruction and parts manual. FAN
The shaft and gear driven fan is responsible for driving the heat from the cooling water in the radiator tubes.
The fan friction clutch is provided to permit a small amount of slippage when the engine is first started. This slippage, reduces the shock on gears and parts, and therefore reduces wear. The fan does not slip after the engine is once started. The fan friction clutch should be adjusted so that the spring is compressed to not less than 1 inch in length. Fan should not slip easily when engine is standing still. It should require at least a 12-pound pull at outer end of fan blade to slip it. In cases where the fan seems to be properly adjusted and fan slippage continues, examine the fan friction facings, which, if worn, should be replaced, also, examine the fan drive disks. The friction surface of both should be perfectly flat.

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zane

09-07-2000 17:40:52




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 Re: Re: Re: Re: Re: Re: Re: Re: A clutch fan in reply to Ray V, 09-06-2000 18:46:51  
Ray, Good Post. I stand corrected.



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Ron

09-07-2000 08:16:17




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 Re: Re: Re: Re: Re: Re: Re: Re: A clutch fan in reply to Ray V, 09-06-2000 18:46:51  
One little item to add:
Ray, from your post it says "adjust the fan clutch" but on my 50 (and probably many other models of that era) the clutch is not adjustable so that is partially why I find it hard to believe that it is made to slip with variations in the drive power. There are actually two clutch disks in there, one in front and one behind the fan and that spring puts LOTS of pressure against those clutches. My theory is that it is much more likely to be designed this way for safety reasons, to stop the fan if a major obstruction gets in the way. (Flame away guys!)

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WTW

09-07-2000 06:49:48




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 Re: Re: Re: Re: Re: Re: Re: Re: A clutch fan in reply to Ray V, 09-06-2000 18:46:51  
Ray, Thanks for this good and correct information, now everybody will Know the "The Rest Of The Story" Thanks Again Dave W.



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