OK, here is how I learned and how it works. Many years ago I was helping a friend by driving one of his three ten wheeler R Mack trash compacter trucks for two days so that he could still go on vacation after a long time employee left him. I had my heavy commercial license and was familiar with truck driving but had never driven a duplex. His sons told me don't worry you don't need low range anyway, just high and reverse. The first day was around 250 stops. I wasn't using the clutch between gears, but the starts and stops had really done a number on my knee. The next morning after I limped in his sons explained to me "Oh, you don't use the clutch to start with these trucks" and they showed me how. What you do, and this is even with a full load and it is with the engine running, you put the secondary in neutral and then the transmission in 1st. Then you give the throttle just a little tap, and with the back of your hand just nudge the auxiliary into low. Because of all the slack in the driveline and the two transmissions it slides in just as nice and easy as can be. Now here is the only trick to it, before adding any throttle, you have to pull the auxiliary back into high fairly quickly, because even with no throttle, the gears will load up too much to be able to shift them. Once you have it in high first you give it the gas and go as usual. This will work even on a pretty good up grade once you have had a little practice. Anybody standing beside the truck would not notice a thing, because it works so smoothly. So Tractor Vet, I know that it is hard to find an old Duplex Mack out there any more, but see if you can find one to give this a try. Actually I expected you to be the one who would know about it.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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