fan belt fail M7060HDC
- Thread starter RoyKing
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diesel85
Veteran Member
Yep, check the tension.
I wish the newer machines had automatic tensioners.
I wish the newer machines had automatic tensioners.
rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,949
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
To my eye that belt looks like one that has been run at the limit of it's ability to handle heat and stress. Do you tend to run your 7060 at high RPM & the AC turned up?
There's a lot that goes into the V-belt versus flat belt versus tooth belt debate. The other day I was reading a technical paper about belt and pulley design. This one wasn't about wear or lifespan so much as being about the sound that a belt makes as it constantly traps, compresses, and then releases air. I'm always surprised at how little I know....
It turns out that flat belts and toothed belts have a bit more of a problem with making noise from air compression than V belts do. V belts can leave a space at the bottom of the "V" on the pulley for an air passage. Apparently that helps..... I had never thought much about it.
As with a lot of things that wear, the real solution to wear and noise on belts is simple and the same as wear & noise generally - just design whatever you are drawing up to be a bit larger and run it slower. There's a theoretical efficiency advantage in smaller&faster that doesn't translate well to the real world where things are often more efficient larger&slower. The downside is that designing components - like say an AC compressor - to be a tad larger and run a tad slower tends to cost more on the manufacturing side.
enjoy,
rScotty
There's a lot that goes into the V-belt versus flat belt versus tooth belt debate. The other day I was reading a technical paper about belt and pulley design. This one wasn't about wear or lifespan so much as being about the sound that a belt makes as it constantly traps, compresses, and then releases air. I'm always surprised at how little I know....
It turns out that flat belts and toothed belts have a bit more of a problem with making noise from air compression than V belts do. V belts can leave a space at the bottom of the "V" on the pulley for an air passage. Apparently that helps..... I had never thought much about it.
As with a lot of things that wear, the real solution to wear and noise on belts is simple and the same as wear & noise generally - just design whatever you are drawing up to be a bit larger and run it slower. There's a theoretical efficiency advantage in smaller&faster that doesn't translate well to the real world where things are often more efficient larger&slower. The downside is that designing components - like say an AC compressor - to be a tad larger and run a tad slower tends to cost more on the manufacturing side.
enjoy,
rScotty
hopefully because nobody else has mentioned it was fluke, that a new belt and proper tension will cure. Was very hot and turning a bush hog doing heavy cutting at 600 pto speed. I thought general rule was cover at least 90 degrees with belt the AC looks to be only slightly over 45 degrees
Peter 315
Super Member
I bet if you looked around you could find a flat pulley maybe smaller diameter and put the belt under the tension pulley......
Will a vbelt work with smooth pulley running on its backside as a tensioner like the wide flat serpentine belts do? I could find idler then spacer out and adjust belt length.
In the mean two new belts are on the way and closer attention will be paid to that belt, leave the guard off for awhile
In the mean two new belts are on the way and closer attention will be paid to that belt, leave the guard off for awhile
rScotty
Super Member
- Joined
- Apr 21, 2001
- Messages
- 9,949
- Location
- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I would do just what you have done - try another belt and watch it for awhile. And while I did that I'd be a little suspicious of that tensioning device they used. I think that V belts might work with a smooth pulley on their backside - but two things bear watching.
One is that since I'm guessing most V-belts aren't made to tension that way, which means theback of the belt may not be as regular in shape or shape or composition as the V part. So I'd first look around and find a belt that tensions from the backside and see if it is a style that I can get in the size I need. Somebody probably makes a backside tensioning belt like that. And if that somebody is Gates, they make it in every size imaginable.
And then secondly the back side idler pulley may not want to be flat. I suspect that some "flat" tensioners actually have a slight radius to help the belt keep itself centered.....sorta likehow the "flat" pulleys on a bandsaw are not flat and they keep the blade centered.
good luck,
rScotty
One is that since I'm guessing most V-belts aren't made to tension that way, which means theback of the belt may not be as regular in shape or shape or composition as the V part. So I'd first look around and find a belt that tensions from the backside and see if it is a style that I can get in the size I need. Somebody probably makes a backside tensioning belt like that. And if that somebody is Gates, they make it in every size imaginable.
And then secondly the back side idler pulley may not want to be flat. I suspect that some "flat" tensioners actually have a slight radius to help the belt keep itself centered.....sorta likehow the "flat" pulleys on a bandsaw are not flat and they keep the blade centered.
good luck,
rScotty
Like Tractors
Silver Member
I had a problem at 50 hours working in warm weather, I heard belt squeal, stopped and adjusted belt tension, I ran it to 190 hours without another belt issue. Loss of power/missfire/low fuel pressure, now that is whole other issue that M7060s have.
I think I may have found the problem
POWER FLEX-RPF
BANDO's Molded notch design gives extra flexibility to reduce heat build-up and provide long belt life, especially on small pulleys.
I don't see any sign of notch's on my belt and the AC, fan, idler are small pulleys the crank drive pulley is large. So they are in 2 to 1 over drive.
POWER FLEX-RPF
BANDO's Molded notch design gives extra flexibility to reduce heat build-up and provide long belt life, especially on small pulleys.
I don't see any sign of notch's on my belt and the AC, fan, idler are small pulleys the crank drive pulley is large. So they are in 2 to 1 over drive.
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