Re: Anyone need to run drawbar pull on their tra

Posted by El Toro on October 29, 2006 at 06:22:50 from (205.188.116.133):

In Reply to: Re: Anyone need to run drawbar pull on their tra posted by Randy as in Randy-IA on October 28, 2006 at 15:47:18:

Hi Randy, When we conducted drawbar pull test on a vehicle with a stick manual transmission we ran the test by engine speed. We would start at max rpm at wot and would drop the rpm's by 200 rpm's and when you do this the drawbar pull will rise as you go lower in rpm's. We would plot this on graph paper where rpm's versus drawbar pull. You will reach a point where you are at max drawbar as you keep dropping the rpm's. You will also notice as you go lower in rpm's the the drawbar pull will drop off at some point. When you reach this point there's no need to go lower in rpm's.
We would then let off on the load and go back to
max rpm's. Then we would run another set of readings using the same rpm's again. Then we would plot the readings to obtain a curve. We ran every gear and we ran full load fuel consumption too.

On some vehicles like your Farmall tractors that have the engine speed governed you won't be able to change the rpm since the governor cuts in to recover. We ran these by road speed starting at the max rs. We would drop the road speed by one mph until the max drawbar pull is obtained. The vehicle may start to lose traction and the pull will fall off. We would not go any lower in rs here. On the higher gears we ran by road speed
too, but we would quit when the drawbar pull dropped off. You don't want to overload your clutch by stalling your test vehicle and having the clutch smoking. The M7 has a calibrated 5th wheel for measuring road speed too. Hal

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