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#1
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Sears tractor keeps destroying pulleys
Hello
My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? John |
#2
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Sears tractor keeps destroying pulleys
John wrote:
Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Sounds like you're hitting stuff that shouldn't be. _Something_ is going to give if you hit something solid enough to stop the blade while the drive is engaged. Don't know what you expect to happen??? -- |
#3
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Sears tractor keeps destroying pulleys
On Nov 30, 12:43 pm, wrote:
On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? John You need to WALK the area and remove all these obstacles that do not belong there. Your blade should not be hitting anything but grass. I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. Is the left blade closer to the ground? Do you always (typically?) follow the exact same route such that the left blade meets the obstacle but the right never does? Obviously clearing all obstacles is the first thing you need to deal with, but I would also try to determine what is different about the left side blade vs. the right - either its position on the tractor or the route it travels when you mow. |
#4
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Sears tractor keeps destroying pulleys
DerbyDad03 wrote:
On Nov 30, 12:43 pm, wrote: On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: .... ... for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. ... .... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I'm not taking offense as you don't intend to be critical I understand, but I'll add a little note... He says the blade is stopped by an obstruction while in gear. If there is something other than an external cause, that would be a fault that could be addressed mechanically otherwise nothing but changing the operation would seem to address the problem. I do suppose the chance of the leveling could be a contributing issue, but if it is so bad as to cause the left side to be digging in to the point it stops a blade tip and the right not, one would think the unevenness of the cut would be obvious enough to be noted. -- |
#5
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Sears tractor keeps destroying pulleys
According to John :
Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Despite what others say, it should be able to stop momentarily without destroying anything. I hit lots of things (rather rough ground in places), and I've never had any damage (except for the blade getting dinged of course). Can you slacken off the belt a bit so it'll slip? Maybe it's too tight. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. |
#6
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Sears tractor keeps destroying pulleys
On Nov 30, 1:41 pm, dpb wrote:
DerbyDad03 wrote: On Nov 30, 12:43 pm, wrote: On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: ... ... for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. ... ... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I'm not taking offense as you don't intend to be critical I understand, but I'll add a little note... He says the blade is stopped by an obstruction while in gear. If there is something other than an external cause, that would be a fault that could be addressed mechanically otherwise nothing but changing the operation would seem to address the problem. I do suppose the chance of the leveling could be a contributing issue, but if it is so bad as to cause the left side to be digging in to the point it stops a blade tip and the right not, one would think the unevenness of the cut would be obvious enough to be noted. -- I think we are on the same page here. That's why I mentioned both the position of the blade and the route taken. Let's put a root out in the middle of his yard. Now let's assume his left ball...err...blade hangs lower than his right. If he travels a route than continually takes his left one over the roots, he going to smack it everytime he goes by (ouch!). However, if he varies his route a little to one side, the right one might clear it. This could happen due to uneveness of turf, a physically lower left ... blade, or even a left blade that is bent differently than the right. |
#7
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Sears tractor keeps destroying pulleys
John wrote:
Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Can't say for sure but it sorta sounds like there is vertical wobble at the star (shouldn't be). One thing sure, hitting a stick should *NOT* cause what is happening...I regularly hit oak roots and fallen branches - branches up to 2" in diameter - with no damage other than dulling the blade which is always dull anyway. I don't mow, I thresh I've never even had debris stop the mower unless it is physically big enough and oriented so it gets kicked up and wedged in the blade housing. In that case, the blade drive belt slips. And smokes if I don't shut it off. You sure your belt isn't too tight and that you are using the correct length (BTW, belts are a lot cheaper at auto stores). No wobble in the pulleys? All the bearings good? -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
#8
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Sears tractor keeps destroying pulleys
On Nov 30, 1:55 pm, (Chris Lewis) wrote:
According to John : Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Despite what others say, it should be able to stop momentarily without destroying anything. I hit lots of things (rather rough ground in places), and I've never had any damage (except for the blade getting dinged of course). Can you slacken off the belt a bit so it'll slip? Maybe it's too tight. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. Good point. Shouldn't there be a sheer pin or key that would give before a pully would strip out? |
#9
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Sears tractor keeps destroying pulleys
DerbyDad03 wrote:
On Nov 30, 1:41 pm, dpb wrote: DerbyDad03 wrote: On Nov 30, 12:43 pm, wrote: On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: ... ... for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. ... ... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I'm not taking offense as you don't intend to be critical I understand, but I'll add a little note... He says the blade is stopped by an obstruction while in gear. If there is something other than an external cause, that would be a fault that could be addressed mechanically otherwise nothing but changing the operation would seem to address the problem. I do suppose the chance of the leveling could be a contributing issue, but if it is so bad as to cause the left side to be digging in to the point it stops a blade tip and the right not, one would think the unevenness of the cut would be obvious enough to be noted. -- I think we are on the same page here. That's why I mentioned both the position of the blade and the route taken. Let's put a root out in the middle of his yard. Now let's assume his left ball...err...blade hangs lower than his right. If he travels a route than continually takes his left one over the roots, he going to smack it everytime he goes by (ouch!). However, if he varies his route a little to one side, the right one might clear it. This could happen due to uneveness of turf, a physically lower left ... blade, or even a left blade that is bent differently than the right. But it's that far off and he hasn't figured that out???? Seems farfetched to me. Not impossible, but surely unlikely I would think unless the guy is also blind as well as imbalanced... -- |
#10
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Sears tractor keeps destroying pulleys
DerbyDad03 wrote:
On Nov 30, 1:55 pm, (Chris Lewis) wrote: According to John : Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Despite what others say, it should be able to stop momentarily without destroying anything. I hit lots of things (rather rough ground in places), and I've never had any damage (except for the blade getting dinged of course). Can you slacken off the belt a bit so it'll slip? Maybe it's too tight. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. Good point. Shouldn't there be a sheer pin or key that would give before a pully would strip out? That would be "shear", curtains are "sheer"... If there were one, certainly one would expect that to occur. Many cheapies don't. I wouldn't expect to hit anything so hard so frequent as to stop a blade entirely dead w/o causing damage. Not sure what OP is calling a "star" drive -- could be that it's failing there because it was designed as the weak point. The JD's I have use a keyed shaft and the key serves the function of the shear pin. Whatever it is, I still say the solution is most likely the answer to the old story about the doctor's solution to the complaint "It hurts when..." -- |
#11
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Sears tractor keeps destroying pulleys
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#12
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Sears tractor keeps destroying pulleys
On Nov 30, 2:09 pm, dpb wrote:
DerbyDad03 wrote: On Nov 30, 1:41 pm, dpb wrote: DerbyDad03 wrote: On Nov 30, 12:43 pm, wrote: On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: ... ... for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. ... ... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I'm not taking offense as you don't intend to be critical I understand, but I'll add a little note... He says the blade is stopped by an obstruction while in gear. If there is something other than an external cause, that would be a fault that could be addressed mechanically otherwise nothing but changing the operation would seem to address the problem. I do suppose the chance of the leveling could be a contributing issue, but if it is so bad as to cause the left side to be digging in to the point it stops a blade tip and the right not, one would think the unevenness of the cut would be obvious enough to be noted. -- I think we are on the same page here. That's why I mentioned both the position of the blade and the route taken. Let's put a root out in the middle of his yard. Now let's assume his left ball...err...blade hangs lower than his right. If he travels a route than continually takes his left one over the roots, he going to smack it everytime he goes by (ouch!). However, if he varies his route a little to one side, the right one might clear it. This could happen due to uneveness of turf, a physically lower left ... blade, or even a left blade that is bent differently than the right. But it's that far off and he hasn't figured that out???? Seems farfetched to me. Not impossible, but surely unlikely I would think unless the guy is also blind as well as imbalanced... --- Hide quoted text - - Show quoted text - unless the guy is also blind as well as imbalanced Hey, he's replaced it 4 times in 2 years and he's just asking about it now? Who knows? ;-) |
#13
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Sears tractor keeps destroying pulleys
"DerbyDad03" wrote in message
... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I wonder if the deck is designed in such a way that if the right blade hits a loose object it gets deflected or ejected thru the chute, but when the left one hits something it gets wedged and stops the blade? Eric Law |
#14
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Sears tractor keeps destroying pulleys
Original poster he Thanks for all the replys. I have done quite a bit of root removal and I ry to be careful.It's never going to be completely pristine yard though . But it seems to me the trackor should be able to take a bit of punishment. My old Wheel Horse which was a third the price would hit obsructions too but in that case the belt would slip an I would see and smell it burn. I'd stop without much damage being done . I think I must be missing something. The belt is not all tight, the pulley was bolted down very well and still I'm broken down for god knows how long. I question is , has anyone had this happen to them as well ? Is there a design problem? |
#15
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Sears tractor keeps destroying pulleys
On Nov 30, 2:16 pm, dpb wrote:
DerbyDad03 wrote: On Nov 30, 1:55 pm, (Chris Lewis) wrote: According to John : Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? Despite what others say, it should be able to stop momentarily without destroying anything. I hit lots of things (rather rough ground in places), and I've never had any damage (except for the blade getting dinged of course). Can you slacken off the belt a bit so it'll slip? Maybe it's too tight. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. Good point. Shouldn't there be a sheer pin or key that would give before a pully would strip out? That would be "shear", curtains are "sheer"... If there were one, certainly one would expect that to occur. Many cheapies don't. I wouldn't expect to hit anything so hard so frequent as to stop a blade entirely dead w/o causing damage. Not sure what OP is calling a "star" drive -- could be that it's failing there because it was designed as the weak point. The JD's I have use a keyed shaft and the key serves the function of the shear pin. Whatever it is, I still say the solution is most likely the answer to the old story about the doctor's solution to the complaint "It hurts when..." --- Hide quoted text - - Show quoted text - That would be "shear", curtains are "sheer"... I've alweys heted thet thay put the "a" key so close to the "e" kay. I gat tham mixed up all tha time. |
#16
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Sears tractor keeps destroying pulleys
On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John
wrote: Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. Is this a spline shaft? If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? John Steel is not just steel. Properly heat treating the correct type of steel makes a huge difference in the longevity of a splined connection. Are your replacement parts aftermarket parts? Did Sears change their supplier of parts? Can you swap left from right to troubleshoot this possibility. |
#17
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Sears tractor keeps destroying pulleys
John wrote:
Original poster he Thanks for all the replys. I have done quite a bit of root removal and I ry to be careful.It's never going to be completely pristine yard though . But it seems to me the trackor should be able to take a bit of punishment. My old Wheel Horse which was a third the price would hit obsructions too but in that case the belt would slip an I would see and smell it burn. I'd stop without much damage being done . I think I must be missing something. The belt is not all tight, the pulley was bolted down very well and still I'm broken down for god knows how long. I question is , has anyone had this happen to them as well ? Is there a design problem? I don't really think so, no. What are you actually hitting? My suggestion w/o seeing what your situation is to raise the blade higher so it doesn't hit obstructions. -- |
#18
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Sears tractor keeps destroying pulleys
On Fri, 30 Nov 2007 15:20:29 -0500, wrote:
On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. Is this a spline shaft? Isn't a pulley pressed onto these spline (star) shafts? |
#19
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Sears tractor keeps destroying pulleys
On Fri, 30 Nov 2007 13:21:32 -0800, Oren wrote:
On Fri, 30 Nov 2007 15:20:29 -0500, wrote: On Fri, 30 Nov 2007 09:27:50 -0800 (PST), John wrote: Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. Is this a spline shaft? Isn't a pulley pressed onto these spline (star) shafts? I don't know how these pulleys are attached. It sounds like either a sliding spline connection or a press fit spline like you say? Either way the metallurgy involved may be the problem. |
#21
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Sears tractor keeps destroying pulleys
Failure at the shaft/pressed pulley...SWAG. So you are saying that this assembly is swaged together as one piece at the factory? |
#22
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Sears tractor keeps destroying pulleys
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#23
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Sears tractor keeps destroying pulleys
dpb wrote:
Not sure what OP is calling a "star" drive The end of the mandrel is shaped rather like an asterisk. It's maybe 3/4 - 1" in diameter and the blade has a matching hole that fits over it. Belt turns pully, pully turns mandrel, mandrel (star) turns blades. -- could be that it's failing there because it was designed as the weak point. Nope. It isn't weak. -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
#24
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Sears tractor keeps destroying pulleys
John wrote:
Hello My Sears 1000 XLT tractor is driving absloulutely nuts . The pulley that drives the left side blade keeps stripping. The pulley is attached to it's shaft with a star connection. If I hit a root or stick or for whatever season the blade is stopped the belt will keep the pulley spinning and the connection is destroyed. The star opening on the pulley gets every so slightly stripped and enlarged and begins to saw away at the spindle destroying both within seconds. This happens only on the left blade, never on the right. To replace the pulley and spindle costs me about $60 each time. so far in the two years that I have owned time machine this happened 4 times! Can anyone tell me what going wrong ? John Yeah. You bought a Crapsman. |
#25
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Sears tractor keeps destroying pulleys
Eric wrote:
"DerbyDad03" wrote in message ... I'm not going to disagree with sa or dpb, but I'll admit that it does sound strange that if an obstacle is what is causing the problem, you somehow managed to hit it (or them) with the left blade 4 times and never with the right. I wonder if the deck is designed in such a way that if the right blade hits a loose object it gets deflected or ejected thru the chute, but when the left one hits something it gets wedged and stops the blade? Eric Law Then, no matter how tight the belt, the belt would slip. Not believable. |
#26
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Sears tractor keeps destroying pulleys
"John" wrote in message
... Original poster he Thanks for all the replys. I have done quite a bit of root removal and I ry to be careful.It's never going to be completely pristine yard though . But it seems to me the trackor should be able to take a bit of punishment. My old Wheel Horse which was a third the price would hit obsructions too but in that case the belt would slip an I would see and smell it burn. I'd stop without much damage being done . I think I must be missing something. The belt is not all tight, the pulley was bolted down very well and still I'm broken down for god knows how long. I question is , has anyone had this happen to them as well ? Is there a design problem? Are there shear pins somewhere on the drivelines to the blades? If there are, I would be that the left one isn't a shear pin but rather an ordinary bolt or the shaft is frozen in place perhaps through corrosion. The machine is meant for cutting grass....not punishment. |
#27
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Sears tractor keeps destroying pulleys
On Nov 30, 8:26 pm, "dadiOH" wrote:
dpb wrote: Not sure what OP is calling a "star" drive The end of the mandrel is shaped rather like an asterisk. It's maybe 3/4 - 1" in diameter and the blade has a matching hole that fits over it. Belt turns pully, pully turns mandrel, mandrel (star) turns blades. -- could be that it's failing there because it was designed as the weak point. Nope. It isn't weak. -- dadiOH ____________________________ dadiOH's dandies v3.06... ...a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it athttp://mysite.verizon.net/xico mandrel is shaped rather like an asterisk...the blade has a matching hole But the OP said the *pully* mates with the star shapped shaft, not the blade. |
#28
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Sears tractor keeps destroying pulleys
DerbyDad03 wrote:
On Nov 30, 8:26 pm, "dadiOH" wrote: dpb wrote: Not sure what OP is calling a "star" drive The end of the mandrel is shaped rather like an asterisk. It's maybe 3/4 - 1" in diameter and the blade has a matching hole that fits over it. Belt turns pully, pully turns mandrel, mandrel (star) turns blades. -- could be that it's failing there because it was designed as the weak point. Nope. It isn't weak. mandrel is shaped rather like an asterisk...the blade has a matching hole ________________ But the OP said the *pully* mates with the star shapped shaft, not the blade. So he did. And it is. I misread. Actually, there is a star at both ends of the mandrel shaft...a beefy one for the blade, another smaller for the pulley. Just going by memory - I'm not going to go drop my deck to look - there are two pulleys on the left...one for idler, another for the blade drive belt. On my deck there is also a large washer *under* both the left and right blade pulleys. It's location there is kinda counter-intuitive as usually washers go between the nut and whatever is being held on but the reason for it being under the pulley is to elevate the pulley so it's hub is completely on the shaft's "star". (IIRC correctly, the washer also creates sort of a broader base for the pulley to resist wobble.) If the washer is missing (or on top) the pulley's hub only partially engages the drive on the shaft. Which means it would strip more easily. -- dadiOH ____________________________ dadiOH's dandies v3.06... ....a help file of info about MP3s, recording from LP/cassette and tips & tricks on this and that. Get it at http://mysite.verizon.net/xico |
#29
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Sears tractor keeps destroying pulleys
id be sure your pinching the pully good when tightening the bolt, if
pully isnt getting pinched it will wear out inside.. maybe locktight it and tourqe it.. then recheck after you mow each time to see if its loosening. i had a pully on a deck kept comming loose,forget now what tractor, i got a grade 8 bolt,red locktighted it and socked it down tighter than it should be..fixed it. lucas http://www.minibite.com/america/malone.htm |
#30
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Sears tractor keeps destroying pulleys
According to DerbyDad03 :
On Nov 30, 1:55 pm, (Chris Lewis) wrote: Despite what others say, it should be able to stop momentarily without destroying anything. I hit lots of things (rather rough ground in places), and I've never had any damage (except for the blade getting dinged of course). Can you slacken off the belt a bit so it'll slip? Maybe it's too tight. Good point. Shouldn't there be a sheer pin or key that would give before a pully would strip out? Normally, they use shear pins or keys on shafts that are gear/chain/direct drive, so if you have an abrupt stoppage, you don't damage the engine or transmission or gears. With belt driven components, they tend to rely on belt slip for protection. My Cub Cadet, for example, has a shear pin on the driveshaft between the engine and the (hydraulic) transmission. In contrast, the Cadet's attached equipment (mower deck, snow blower etc) are belt driven, and have (at least) two slip points: the first one being one or more belts (there are two belts between the PTO pulley and side blades). The second being the PTO engagement clutch. They don't necessarily slip much - if I run the blower into a snowbank that's too much for the 12HP engine, the engine _will_ stall. However, it takes several revolutions with loud squealing from the belts. At least it's not instantaneously - which could do damage. Cadets are built _tough_. This thing is from the early 70's, and I use it almost like a bush hog at times. It had the bearing on the main cutter blade wear out, the two idler pulleys that feed the mower deck have destroyed their bearings twice each, and I've had to replace the main mower belt several times (this belt is rather fussy. Standard V belts aren't deep enough, and I screwed up once and got too big a pulley which caused the belt to rub). The mower deck has had to be unbent once. Aside from that... On the Cadet, the side blades (it has three) are run by a long belt (never replaced that I know of) from the center pulley, and tensioned with a idler pulley on a spring. In the OP's case, I'd: 1) Make sure that the deck isn't bent/distorted especially on the side of the blade that destroys its spindles. It could be getting restricted at the blade tip and very subject to jamming, or perhaps the spindle mount is bent out of plane with the others. 2) See if he can slacken the belt a bit. 3) If it has a slippable engagement clutch, see about backing it off slightly. Only slightly, otherwise he'll burn it out. You only want it to slip on a stall. -- Chris Lewis, Age and Treachery will Triumph over Youth and Skill It's not just anyone who gets a Starship Cruiser class named after them. |
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