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How to dyno a jd D

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D dude

03-15-2002 08:47:17




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How can I put my D on a dyno when is has no PTO. Mine was built for pulling a disk and some belt pully work. Can anone tell me how to do this? Thanks D dude




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lynn

03-16-2002 13:02:34




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 Re: How to dyno a jd D in reply to D dude, 03-15-2002 08:47:17  
D dude..have hooked two tractors together by the belt pulleys..twist the belt so the slave tractor pulley turns the same way..leave the clutch unengaged and hook the slave pto up to the dyno with the slave tractor running so some oil gets to the pulley bushing..make sure the pulley bearing has plenty of grease in it..did a d ..wasn't best situation but could put load on the tractor..maybe needed better belt..lynn

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Mike Aylward

03-15-2002 18:47:15




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 Re: How to dyno a jd D in reply to D dude, 03-15-2002 08:47:17  
D Dude, it is not hard to make a belt drive for a dyno. I made one for my dyno and use it to check my pulling tractor without a PTO all the time. You will want to make the driven pulley on the shaft close enough to the right size to make the speed close to a standard PTO speed. I used the main shaft out of an old Art's-Way grinder mixer I had and made a mounting frame for it that goes on the 3-point of another tractor making it unnecessary to stake it down. I also had a band rolled to go around the mill drive pulley. On my 60 the drive speed at rated RPM is 543 RPM, assuming no belt slippage. Works great. Hope this helps. Mike

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Will P

03-15-2002 15:35:30




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 Re: How to dyno a jd D in reply to D dude, 03-15-2002 08:47:17  
I have been to a show that had a dyno that could use pto or flat belt. Also a prony brake would work to as I have been on one that was pto and belt too. You have to look around for someone that has a belt dyno.

Will P



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phil

03-15-2002 10:23:46




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 Re: How to dyno a jd D in reply to D dude, 03-15-2002 08:47:17  
If you have access to another tractor, you might be able to use a comparison method. Test the #2 tractor on the PTO dyno. Then belt the #2 tractor to a Baker Fan & record the Fan RPM. Belt the D to the Baker Fan & record the Fan RPM. Then calculate the HP - the HP is proportional to the cube of RPM. Example - #2 has 30 HP & pulls the Fan at 325 RPM. Then the D pulls the fan at 350 RPM. The HP equals (350/325)^3 X 30 = 37.5.
Note. These tests are sensitive to air density & temperature so they should be done on one day.

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