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Hand start 39-B Fan

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Dan in PA

12-07-2002 13:38:41




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Finally got the mag put back on on the 39-B hand start and after sitting for 8yrs and the temp outside in the teens she fired up after 2 pulls on the flywheel. Everything sounded great until the fan started tinging on the shroud. My question? what holds the fan from moving forward and back on the shaft bushing.It looks like there might be somekind of lockdisk or something on the front that the center might have broken out but i'm not sure. I have an I@T shop manuel but they only show the exploded view of the friction disc type on the later models. I sure would appreciate the help and thanks in advance .

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jason r

12-09-2002 08:36:56




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 Re: Hand start 39-B Fan in reply to Dan in PA, 12-07-2002 13:38:41  
dan, i had the same problem with my 39 b. the fan is moving on the shaft because the rubber bushing has gotten old and seperated from the splined core. the rubber was used to allow the fan to "give" on the shaft when the motor hit. after a time the rubber would wear out and seperate from the spline assembly attached to the shaft. that is why they went to the friction disk. to fix it you need to remove all the sheet metal, radiator, ex. pipe, air cleaner, then unplug the mag. take the fan and twist it off of the shaft. sand the shaft, clean it real good, and then sand the rubber part inside the fan. i used a real good adhesive for rubber and metal and spread it on the shaft and fan. the other thing i did was to make sure that i twisted the fan on so that when the motor was running the fan was always turning in. if your parts are worn out beyond this repair and the fan is wobbling around on the shaft then you will have to find a good used one, and that will be hard. or put in a newer friction disk type fan. if you need more help give me a call at 563-659-5479
jason

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jason r

12-09-2002 08:33:23




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 Re: Hand start 39-B Fan in reply to Dan in PA, 12-07-2002 13:38:41  
dan, i had the same problem with my 39 b. the fan is moving on the shaft because the rubber bushing has gotten old and seperated from the splined core. the rubber was used to allow the fan to "give" on the shaft when the motor hit. after a time the rubber would wear out and seperate from the spline assembly attached to the shaft. that is why they went to the friction disk. to fix it you need to remove all the sheet metal, radiator, ex. pipe, air cleaner, then unplug the mag. take the fan and twist it off of the shaft. sand the shaft, clean it real good, and then sand the rubber part inside the fan. i used a real good adhesive for rubber and metal and spread it on the shaft and fan. the other thing i did was to make sure that i twisted the fan on so that when the motor was running the fan was always turning in. if your parts are worn out beyond this repair and the fan is wobbling around on the shaft then you will have to find a good used one, and that will be hard. or put in a newer friction disk type fan. if you need more help give me a call at 563-659-5479
jason

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Dan in PA

12-09-2002 10:57:07




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 Re: Re: Hand start 39-B Fan in reply to jason r, 12-09-2002 08:33:23  
Jason,thanks for the help,my problem and the one you had are exactly alike. My fan and hub are still very snug but the fan moved forward ever so slightly which caused the fan blades to ting on the shroud stud thats is what drew my attn to it. I am wandering if I slide the fan back just enough to get a small muffler clamp on the front of it to prevent it from moving forward if that will work, until I find a replacement . I sure don't want to replace a perfectly good radiator core. Could you tell me what adhesive you used , I was thinking of using Hybond Adhesive,I think it's made by Dupont.

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jason r

12-09-2002 11:25:29




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 Re: Re: Re: Hand start 39-B Fan in reply to Dan in PA, 12-09-2002 10:57:07  
the adhesive i used was made by 3-m it was bought at my local farm supply store. it came in a red and blue package and was one tube stuff. i don;t have the exact name because i'm at work but i'll post the name later. i was not so lucky and had the fan go into the new core. i tried to move it back with the tractor put together and found that it still came off. oil got under the rubber boot and made the fan slide. so i took all of the stuff off to clean it up, and to fix the radiator i also tried to get a clamp, washer etc and the force of the fan kept loosening the fixes. i think that if left alone the clamp could fly off and ruin the fan, core, or an unlucky person next to or on the tractor. i run my b about 5 or 6 hrs a week and i repaired the fan 2 months ago and it is holding really well.

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Bill Hires

12-07-2002 13:55:03




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 Re: Hand start 39-B Fan in reply to Dan in PA, 12-07-2002 13:38:41  
There are two slots in the front fan shaft mounting bracket. Loosen the two bolts and slide the shaft over enough to clear the fan shroud .



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Dan in PA

12-07-2002 14:08:06




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 Re: Re: Hand start 39-B Fan in reply to Bill Hires, 12-07-2002 13:55:03  
The fan is moving on the shaft ,the lock or whatever holds the the fan on the shaft in it's proper place is broken or loose or whatever.



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Bill Hires

12-08-2002 04:50:45




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 Re: Re: Re: Hand start 39-B Fan in reply to Dan in PA, 12-07-2002 14:08:06  
There is a split cone lock and a keeper on the outer end of the shaft, holding the fan friction disc, washer and fan, is this missing? If this were the case the fan blade would probably be hitting the radiator core. Is there any noise indicating a bad fan shaft bearing?



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Dan in PA

12-08-2002 14:09:27




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 Re: Re: Re: Re: Hand start 39-B Fan in reply to Bill Hires, 12-08-2002 04:50:45  
This is a 39-b hand start,it doesn't have the friction disc type setup on the fan.The fan is loose, not real loose, on the fanshaft,I t is turning on the inner sleeve, what do I have to do to snug it down or lock it in place. What I need is a break down of the fanshaft assembly on this model.That would give me a good idea of what could be wrong,or worn or missing.



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