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Tool Talk Discussion Forum

Chain speed vs. belt speed

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farmallwayne

10-20-2005 13:05:31




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I am looking to put a hyd pump off the crank shaft of a tractor. Can I use chain drive or should I use belt drive. Does anyone have a chart telling what speeds the various chains are rated at and hp raiting. I was thinking about using #40 or #35 chain but don't know if it will last long at 1800 rmp.

Thanks
Wayne




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mike j

10-21-2005 22:29:33




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 Re: Chain speed vs. belt speed in reply to farmallwayne, 10-20-2005 13:05:31  
Well i would be inclined to use belt(s)at least when they fail they usually don't take the front off the motor. I lost the chain coupler that drives the pump on my bale wagon and it took the waterpump and all pulleys with it . good luck with what ever you do. mike



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J. Schwiebert

10-21-2005 13:31:44




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 Re: Chain speed vs. belt speed in reply to farmallwayne, 10-20-2005 13:05:31  
First of all what size pump and how much pressure. Then you will need to know how much horsepower the drive needs to develop. How about a crankshaft driven pump?



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IA Roy

10-20-2005 19:00:34




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 Re: Chain speed vs. belt speed in reply to farmallwayne, 10-20-2005 13:05:31  
A chain drive could do the job. However keeping the chain lubricated can be a problem. Chain stretch can be a problem. I used to have a Yamaha 125 in the 70's that used a #41 chain which is a narrow #40. I am guessing it carried 10 to 12 hp. A v-belt drive cannot carry near the load. The faster the better and the bigger the pulleys the better. In my opinion a better choice for moderate speeds and loads is to use a timing belt drive. It is much quieter and cleaner than a chain drive and carries much more power than a v-belt. You should be able to get drive calculation formulas from the supplier. They have charts for the pulley sizes and center distances. They are available in about 4 classes of size and strength. Harley Davidson started using them in the mid to late 80's on some pretty big bikes.

Browning makes timing belts, I think they call them gearbelts, I think Goodyear also makes them.

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dr.sportster

10-21-2005 12:23:20




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 Re: Chain speed vs. belt speed in reply to IA Roy, 10-20-2005 19:00:34  
That was one of the stupidest things Harley ever did.A chain gives plenty of fair warning before it fails and can be run in poor condition but a belt on a motorcycle is an inevitable on the road sudden failure.A new well lubed chain transfers power with as much efficiency as a belt.{at least according to the Diamond chain company]



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IA Roy

10-21-2005 13:45:31




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 Re: Chain speed vs. belt speed in reply to dr.sportster, 10-21-2005 12:23:20  
DR Sportster: My opinion of the belts was the same the first time a timing belt on an overhead cam engine (1976 Chevette) let go on me. I noticed that more newer cars are going back to chain drive bathed in oil. The lubrication along with the sealed enclosure is a good system. A direct drive off the front of the crankshaft is my preferred drive if there is available room. On my 1951 Case DC there is not room for a pump. I will do with the non-live pump as long as I have the tractor.

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Fawteen

10-20-2005 13:24:37




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 Re: Chain speed vs. belt speed in reply to farmallwayne, 10-20-2005 13:05:31  
How much work ya planning on doing with the pump? I'd guess that at 1800RPM, you'd be better off with a belt drive. Double or triple, if you need that much power transmitted.



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