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Farmall & IHC Tractors Discussion Forum
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RPM to PTO speed

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John in pennsyl

05-14-2008 04:19:49




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I have an IH 364 diesel with aa BD154 engine. I was wondering what speed I should run the engine at to achieve 540 RPM on the PTO. I noticed some tractors tell you on the tractometer - but mine does not. THANK YOU




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LenNH

05-18-2008 06:59:36




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 Re: RPM to PTO speed in reply to John in pennsylvania, 05-14-2008 04:19:49  
Sorry I don't have any real data, but from all the brochures I've seen, the 540 rpm PTO speed occurs at the "full-load governed speed" of the engine. I'm looking at an old IHC brochure for the H and M. The "engine rpm" is given as 1650, and the PTO speed as 540. Manuals on repair and adjustment usually gave the maximum idle speed, which is naturally somewhat higher than the maximum full-load speed. This was usually easier to adjust than the full-load speed because it could be done with a tach (hand-held to the belt-pulley or PTO in the "old days") while the tractor was sitting. When the load was applied, the engine would then run at the "full-load speed."
I agree with the writer who says the slight difference in engine speed won't hurt the implement you are operating with the PTO.

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Janicholson

05-14-2008 06:22:20




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 Re: RPM to PTO speed in reply to John in pennsylvania, 05-14-2008 04:19:49  
The issue is not critical. The full load speed of the engine is the point at which the engine is making its rated HP and it is usuallu about 80% or so of full throttle no load. This means that at no load with the throttle wide open (hurts nothing) the engine will turn about 20% faster than rated PTO speed. I know of no reason to worry about it. the slight overspeed will not harm any equipment. If it is a light load, and throttling down is needed to conserve fuel, that 80% might be close. It is not a good idea to lug an engine below about 75% of max idle. this produces less actual HP, and overloads bearings and drive train.
JimN

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