Gerald J. - 12/11/2010 01:30

Probably not quite as much gas as a gas 4020 because the 4010 gas engine is smaller. The gas 4020 does consume fuel, but for its day the 4010 was the biggest JD tractor made. And it uses a lot of hydraulic power. Worse there's no extra ignition advance for part throttle operation and that hurts a lot. You need another ten degrees advance for half throttle economy and power. One time I changed my pinto wagon from centrifugal plus vacuum advance to centrifugal only (the only distributor I could mail or telephone order after I broke the original playing with it the milling machine looking for a squeak). It ran great at full throttle while accelerating but was doggy run gently and sucked gas.

According to Larsen's book on that vintage Nebraska tractor tests, the 4010 gas did 9.26 hp-hr per gallon, the LP did 7.59 hp-hr/gallon and the diesel did 12.38 hp-hr per gallon. So at 80 hp developed that's 8.64 gallons per hour gasoline, 10.54 gallons LP per hour, or 6.46 gallons diesel per hour.

The PS 4020 did 11.77 hp hr /gal on diesel, 7.79 hp/hr /gal on gasoline and 7.42 hp hr/gal on LP. For 88 hp that's 7.47 gal/hr diesel, 11.3 gal/hr gasoline, and 11.86 gal/hr LP.

They made 7290 early 4020 gas, 844 late 4020 gas. 7606 early 4020 LP, 839 late LP. 115,010 early diesel, and 54,168 late diesel. They made 299 4000 gas (stripped and lighter weight 4020) and 7796 diesel. The total production 4000 and 4020 was then 8433 gas, 8445 LP, and 176,974 diesel. Total was 193,852 4000 series tractors. Production numbers came Jan Feb 2008 2 cylinder magazine where somebody sat down and counted from the production logs. The logs didn't discriminate between transmissions so those splits are unknown.

Gerald J.