Re: Another transmission: Mack Duplex

Posted by wildcat445 on December 18, 2017 at 12:00:55 from (98.177.223.171):

In Reply to: Another transmission: Mack Duplex posted by showcrop on December 18, 2017 at 04:41:20:

Mack built a Maxitorque Duplex that had the main and compound boxes in one case and two sticks. I had one in a V-8 Mack. This
transmission was also referred to as a six-speed. (The six-speed nomenclature was propagated by Mack owners who had a hired
driver and did not want them splitting the compound!) The main box had five gears and neutral, the compound had high, low,
reverse and neutral. The PTO speed was controlled by the main box. The compound box had to be in neutral to run the PTO if you
were dumping and not moving forward. I burned up the pump on my wetkit running the PTO too fast with cold hydraulic oil. I
drove mine like a five-speed unless I was loaded in the hills. Then I could split the compound and only drop half a gear. This
transmission and the 375 V-8 made a formidable combination for a grain hauler, running both on and off the road. The weak spot
in the driveline was the u-joint yokes. The truck had so much torque and gearing that the driveline would not hold it if you
got careless with the clutch in soft ground. That old V-8 Mack was governed at 2200 rpm, good for 72 mph. Loaded or empty it
ran 72 mph. That was the steadiest truck I ever drove. The limit to this truck on the road was the pyrometer. The only time I
used the clutch in a Mack was to get the truck moving. Mack transmissions were designed to be power shifted. Most non-Mack
drivers tried to clutch one and had problems changing gears. If you got the road speed and engine speed right, the trans would
suck the stick into the right gear. It was hard to miss a gear in a Mack. You could lug the engine down to 1200 rpm (Maxidyne
turbocharged engines) before you had to downshift, so you had lots of time to get to the next gear. Not as much fun as driving
a 335 Cummins with a 13-speed Roadranger, but it was easy to get used to. My wife drove my old Mack when I got in a bind.

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