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John Deere Tractors Discussion Forum
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730 Diesel RPM

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beever

08-17-2004 10:49:52




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Hi I go to local tractor pulls with my 730 D they check rpm"s to keep people honest which is a good thing but heres the question what rpm am I suppose to be at they told me 1150 I was at 1200 they let it go but told me to lower it for the next pull. I read in archives 1275 is this correct if I can prove it to be that I"ll be good. Also how do you accuratly check for rpm on a 2 cylinder. They check at wot on me they used a vibra tach. Thank you Mike

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720Deere

08-18-2004 13:45:33




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 Re: 730 Diesel RPM in reply to beever, 08-17-2004 10:49:52  
Beever,

Your email is not open. Email me and I will send you the spec sheet from the 720 diesel manual. I know it's not for the 730, but they are the same engine and specs. Factory settings for no load fast idle is 1250 rpm. I would say at 2% over, you are well within an acceptable margin of error.



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msb

08-17-2004 19:29:22




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 You can tell em I said,LOL in reply to beever, 08-17-2004 10:49:52  
that they about all came from the factory showing 1300 rpm.Best way as stated is to check the PTO speed .Those tachs were never really too reliable.



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Clooney

08-17-2004 13:12:33




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 Re: 730 Diesel RPM in reply to beever, 08-17-2004 10:49:52  
Bever, right out of the owners manual----

*Loaded RPM =1125

*Fast idle = 1250

*Slow idle = 700

PTO RPM =547

The best way to check that speed is with a hand held shaft RPM counter [just hold on the spinning PTO or crankshaft for 1 minute & count the RPM�s that have taken place in that minute].. If you have a replacement clutch cover it should have a dimple in it for that purpose.. If you have an original clutch cover you might have to drill a center hole [or dimple], or pull the clutch cover & center drill the clutch drive disk bolt�

Once you use a hand held shaft speed tac you can mark the factory dash tac for 1250 then know where the engine is by the dash tac.. Those reed type vibration tacs don�t work very good on a diesel..

[email protected]

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Mike M

08-17-2004 12:03:24




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 Re: 730 Diesel RPM in reply to beever, 08-17-2004 10:49:52  
I think that figure of 1275 is correct. But you will need proof take a copy of your owners manual with you.I have never used a vibra tach on these I use a mechanical hand held unit against the pulley cover center. Have them run that vibra tach on some of these newer air cooled engines like Honda ,Kawasaki these don't vibrate and they won't get a reading and show them how sometimes they don't work.They do work great on the older briggs,techumse engines

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Carl

08-17-2004 11:41:05




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 Re: 730 Diesel RPM in reply to beever, 08-17-2004 10:49:52  
The book shows rated speed as 1125 rpm. Governor droop is usually about 10% which would put high idle around 1235 to 1240. We used to check them with a hand tach at school. A hand tach is a mechanical tach with a sticky rubber end on the shaft that is held against the end of a spinning shaft to read rpm.



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G-MAN

08-17-2004 11:01:40




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 Re: 730 Diesel RPM in reply to beever, 08-17-2004 10:49:52  
I think they're incorrect, but I don't have the high-idle spec for sure. Rated speed is 1125 rpm, which is the engine speed used for checking rated horsepower and the speed the tractor was designed to operate at under load. High-idle is certainly going to be more than 25 rpm faster than rated, so your 1275 could be correct. I'd also take speed readings made with a vibra-tach with a grain of salt. If they don't have something to actually count the engine revolutions, i.e. a contact tachometer placed on the end of the belt pulley or a photo-tach to read reflective tape placed on the belt pulley, I'd be real suspicious of how accurate their numbers are. Also check and see if they give allowances. Most clubs allow a 10% variance even for pure-stock tractors, because even factors like engine temp can affect how fast it will run.

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