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History of X/Y joystick pilot control

uffex

uffex

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Good day
It may make interesting reading this may save you a job Per, memories of happy days
 

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Mother Deuce

Mother Deuce

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John C. said:
Koehring used proportional air to hydraulic spools for the swing and boom up functions on the 666 excavator. Those were built in the sixties. I seem to recall the travel was proportional as well. The Link-Belt line machines had what was called a Speed-O-Matic system for the friction controls. It was a simple hydraulic system. The Sumitomo excavators that came here in the early seventies under the Link-Belt name were all pilot control. The 5400 and 5800 Link-Belt excavators were pilot controlled as well in the same time frame. I'm sure there were others as well. Drott had some pilot machines in the late seventies.

The European logging machines went to electro-hydraulic machines in the late eighties and early nineties. Those were the first all computer controlled machines I had anything to do with.
Click to expand...
Ran a Triple 6 for a couple days... back when the dinosaurs would try to steal your lunch. It seems in my foggy memory the bucket and dipper on that particular unit were on air toggles that were frustratingly slow to react. A little like leading a clay pigeon it was about selecting the control before the bucket arrived. The travel toggle was on the house bulkhead and seems after it was selected the swing lever became the travel lever. It was old then, a right hand cab and chain drive flat pad lower. It is the only excavator I have ever ran that had a main clutch. It had some serious grunt.
 
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