Posted by IH fan on August 31, 2011 at 01:58:23 from (108.73.24.38):
In Reply to: Cessna draft control posted by karl f on August 30, 2011 at 22:25:12:
Marvin Darling was the project engineer and I worked with Marvin after the draft control project was done with IH. I happened to be with Marv in Charles City (Oliver) sometime in late 1965 running some instrumentation on rotary cylinders on a backhoe. At the "debriefing" meeting, after the backhoe tests were reviewed, everyone was kind of "kicking back" and shooting the breeze, someone brought up the system Marv had designed for IH in the earlier '60s (before I started working at Cessna). Marv said we still had the tractor, but no more work had been done since IH decided to use their own system, as I recall, that did not require as much re-design of the next generation tractors. Oliver asked if they could see and test the system. Cessna had a newer generation of pressure/flow comp pumps and Marv indicated if it was okay with Cessna brass, we could update the pump and show it to them. We did just that and "rumor" is Cessna allowed, or maybe sold some design features to Oliver. We set it up in Hutchinson and tested it compared to a 1650 Oliver which was demonstrated to Oliver engineers at Hutch, then sent to Charles City for further testing. The 460U came back to Cessna about a year later with the draft control partially dis-assembled. We put it back together and then swapped out the 12 for the 17gpm pump to run some tests using the 8 cu in "high torque" motor on a rotary mower. The "touch control" system was still operational in the tractor. I got along well with Marv because we both had Super 55 Oliver tractors at the time and he kind of took this young kid under his wing and taught me a lot about hydraulics.
As for the differences between the Cessna system and the next generation of IH, I may have heard some details at the time, but it's been over 45 years and I was more involved at the Oliver time, running some instrumentation and since Marv knew I was an old farm boy, got to put some hours on both the IH and Oliver in the field.
This post was edited by IH fan at 02:04:34 08/31/11.
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