Posted by ericlb on July 08, 2019 at 07:49:06 from (75.88.218.252):
maybe someone on here can help im loosing my mind on this truck, the truck is a 70 f350, but it has a utility brand hydraulic ladder and bucket on it, its a original rig, and so old that utility body company doesn't have any info on the serial number, whats happening is the ladder boom, will raise with the electric switch which activates a hydraulic ram, but it will not lower, its been a intermittent problem for awhile, usually solved by shaking the wiring, and a good solid hit to the truck, but nothing happens now, it has a row of 3 electric solenoids ,3 facing up. 3 more facing down, one over the other, now the hydraulic line goes to another, what i call a directional valve, but im not sure thats what it is, the electric w2ires go from the solenoid to this part, it has only 2 wires, but at this time both wires are hot, this part must have a valve in it to make the hydraulic fluid raise the cylinder or let it down, its a one line cylinder, so, gravity down , but hooked up, nothing is happening, im lost as to what i need to do, now the other change is these electric solenoids are pretty audible when the switch calls for them to function, now one is softer, but its on the raising side which works, the down side is louder, but does nothing,i needed the truck today, but right now the ladder is about 16 feet in the air, so its not going anywhere
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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