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Discussion Starter · #1 · (Edited)
Is the main double pulley on a 47" deck supposed to be level with all the other deck pullies or pitched towards the PTO? Full story below:

I acquired a '79 212 a couple weeks ago, my first JD and first real garden tractor. I got it delivered to me with a 47" deck for $275 and i was pretty excited about it. It runs perfect, but the older gentleman i bought from explained how they only used it to pull a trailer on their ranch for the last 18 yrs because it "kept throwing and ruining PTO belts." (BTW, don't worry, a seat is on the way)

I immediatly noticed a substantial rock wedged in deep in an idler pulley and thought that was simply what the issue was. When i was giving the deck a quick restore job over the weekend i noticed that the main drive pulley was digging into the deck and was sitting at a pretty ridiculous angle, cocked up towards the PTO region.

I flipped the deck over and realized that there had been a super sloppy fix to re-mount the spindle sleeve and the weld was awful and the sleeve was not even close to straight. I ground the plate off and re welded the sleeve to the plate so that it would sit level with all the other deck pullies. I remounted the plate to the deck with 4 grade 8, 1/4" bolts so that i could adjust height and angles later if i needed to.

I hooked it all up and it ran perfectly with the deck in the raised position, but would near instantly pop the drive belt off at the main. I tried varying belt tensions with near identical results. The belt is defiinitely not in great condition and could simply be rolling off, but i need to know if i need to adjust the pulley angle before i destroy a new belt.







 

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The rear double pulley does set at a slight angle up to the mule drive. The rear of the pulley should be just above the deck and the front should sits about 1/4 inch high. I would recommend you have someone actually measure this as I'm going from memory as I sold mine last year.
 

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Discussion Starter · #3 ·
The rear double pulley does set at a slight angle up to the mule drive. The rear of the pulley should be just above the deck and the front should sits about 1/4 inch high. I would recommend you have someone actually measure this as I'm going from memory as I sold mine last year.
Ok, i had a feeling it was going to be canted up some. I am going to add some spacers and change the pitch some for now.

If anyone can get exact measurements or if you have anything else to add, please fill me in, i would greatly appreciate it. If i find an angle that works before anyone else comments i will update this thread.
 

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I would also recommend that you take some steel wool/emery cloth and clean the paint off the inner pulley. That will get gummy and the belt will climb on it!
 

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Hmmm... I seem to remember mine being level.. Ill hae to check that out. If noone posts up before tonight, Ill try to get a pic of mine.

Well I hope I spelled everything correctly at a minimum! :ROF
 

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Discussion Starter · #7 · (Edited)
Well, I went to the JD dealer, which thankfully is only about 10 minutes from me, and picked up a new belt. I realized how horrible the old belt was when i saw the new one. I also pitched the pully up toward the mule drive by a few degrees.

Everything at the double pulley appears fine now and I never threw another belt...but now there is a new issue:

At 1/2 throttle i can cut all day with no issues at all.

At 3/4 throttle the V-Pulley on the mule drive flips the belt completely over and jumps out of the guide, riding under it and then does a full twist back in the right direction to catch the PTO pulley...so it's just riding there flipped backwards...quite strange.

At full throttle the entire belt flips around backwards and it transfers throughout the whole system...i've never seen anything like it. It rides V-side out on every single v-pulley and v-side down on the direction change pulley on the mule drive.

Any ideas?
 

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Sounds like at least one of you pulleys has splayed out and is wider than it should be allowing the belt to settle to the bottom and twist. Look for a pulley that looks wider than the others, you may want to measure them all!
 

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Discussion Starter · #9 ·
Sounds like at least one of you pulleys has splayed out and is wider than it should be allowing the belt to settle to the bottom and twist. Look for a pulley that looks wider than the others, you may want to measure them all!
Ok, so no way it could be any of the idlers, right, i am looking for one V-pullies to be widened out? I am thinking if that's the case it almost has to be one on the mule drive. I will look into to before work in the morning.
 

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I've never seen an Idler do this as they're flat and designed to just hold tension normally on a very close pulley! Should be on the ones on the mule drive and hopefully not on the PTO!
 

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while I am sure you will get the belt problem fixed!

that is one **** of a deal for 275$ DELIVERED! (I would have charged 275 just to deliver :fing32:)

wow! best of luck with it!
 

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By the way that is one very nice looking JD 212 and well worth what you paid even considering the deck issue! I have the black plastic cover for the shifter area (minus the plastic tabs) that I'll send you. PM me with your address and you can send me the cost of shipping after you receive it! If you want one from JD I believe they're about $26.00 (don't quote me on that)
 
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