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Discussion Starter · #1 ·
My TR70 seems to have poor life on rotor belts. It only gets maybe 100 hours a year since I also have a TR86. It seems to slip really easily and I have it tightened as far as it will go on the top adjustment. I have put a new one on every year for the last 3. This afternoon I started combining corn and plugged the machine. Had to pull off the side doors and concave extensions and get all the trash and ears of corn out. What a pain! I also plugged it twice doing soybeans. It just seems to me that belt is very easy to stretch for such a big belt. Apparently the drive on the 75's and 85's and newer is improved to keep the belt tighter? I'm running the rotors at 700 and the concaves at #12. The corn is at 21.5%.
Also seem to have a small amount of cob pieces in the grain tank, more in certain varieties of corn. Have tried adjusting rotor speed up and down, but don't want to go down too far because of above problem. Also concave clearance doesn't seem to matter. Have fan set at max speed, about 1100.
Also, do any of you run the front wheels dished out? Will it offset them enough to run between the rows with a 6 row 30" head? Mine are turned in and run on top of the rows. Also if I turn them around I apparently will need a ladder extension.
Thanks for any replies.
 

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Ihave a tr70 and tr85 Te 70 has a better way to tighten the rotor belt, you have adjustment on top and the bottom sheave tighten them both so you don,t have that yoke rubbing on those pulleys, my 85 has a torque limiter on the top sheave that is spring loaded and limits the amount you can tighten your belt, I wouldn,t dish the wheels out unless you had big tires I broke a final drive off of an 85 that way good luck
 

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Discussion Starter · #3 ·
I tightened the bottom yoke once and when I went to beans the next year and got the speed up to 900 the spacer on the bottom of the fork rubbed the pulley. Guess I could try it if I remember to go the other way again later. What settings are you using in corn this year, Weldfixer?
 

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Discussion Starter · #7 ·
Weldfixer
I have it set to the specs in the owner's manual already. I believe they give a measurement from the outside surface of the frame to the yoke, but the belt still seems loose. Can't seem to ever get it as tight as the TR86 and the TR85 I used to have without going out of the specs. I'm using the New Holland belt, too. I think if I ran my rotors that slow I'd be unplgging it constantly, and I don't think it will go below 600.
Are you having any of the cob issues like me?
 

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What happens with theTR70 rotor belt adjustment is that the forks behind the top pulley bend. To tell if this is the problem look at the top adjustment bolt where the spring is on. This bolt goes through a U shaped bracket with the spring on the outside of the U shaped bracket.

This bolt has a knot on it right behind the U shaped bracket and when the forks bend this knot will contact the U shaped bracket. When the knot contacts the bracket tightening the outer spring does no good since the bolt can not travel any farther.

To correct the problem disassemble the yoke behind the top pulley and remove from the combine. Reassemble the yoke when you get it out and put it in a press and straighten it back out. This should give you several years of use before it gets into the same condition.
 

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The belt is tight when you have full rpm at the upper limit, i believe 1100 on a standard and 1600 on a high speed. Tightening just to get the rpm you need is probably not tightening the belt enough. Check for the hubs rubbing.
 

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Next time you take off the rotor belt check to see if there is any side to side play on the lower shieve. I think there is a brass bushing in there like on the traction drive pulleys, also check the alignment of the rotor pulleys. It also has been over 20 years since I have worked on the tr70s. Great combine though.
 

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Discussion Starter · #14 ·
I had a friend of mine who worked on it before come out and we readjusted the bottom of the top fork and have had no problems since. Sometimes you just have to go beyond the book specs, after all, it's 20 years old.
Also ran the rotor speed down to 600 and tightened the concave to 10 and seemed to clean up the cobs, plus the corn s drying slightly. Down to 22 and under. (OH BOY!
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Also had a drive tire blow out last week, but I had a spare in the shed for 4 years. I found a ladder extension at a salvage yard the week before and it came the day before the tire went, so when I had the tire switched we swapped the tires from side to side. Now they run between the rows! Should have done that years ago!
 

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Something else i have seen the tr70 pulleys had tapered square pins that hammer out, my cousin replaced the bottom sheave with one off a tr85 with round pins. I think the reason for this was it was breaking the screw for rotor speed. Should disasemble the drive, they do work. I would convert it to a torque sensor drive of a early tr85, you will not believe the diference.
 

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Discussion Starter · #17 ·
Just wondering, did you move the rear wheels out to match the front? Apparently they have 3 positions for the rear wheels and mine are in the center which is where they want them for 36" rows. I did some combining last week in snow and the rear wheels don't steer very well when not following the fronts. My TR86 has them all the way out behind the front ones.
 

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Digging this thread up from the dead...

Have a TR70 where the rotor belt is very loose. Got bad enough today that it was slipping and quit driving correctly with very little material in the machine.

Going to start digging into it soon - first stop will be the upper yoke based on Mike10's comments.

Is there a heavier yoke or way to beef this up? Don't want to have to bend it and hope it doesn't bend back again?
 
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