Sorry if this is a bit off-topic, but I'm hoping someone has some info on this unique find.
I recently purchased a 1961 Willys Jeep CJ-5 with a 1-ton dual wheel rear axle (both coil and 12-leaf springs on the back) and a backhoe mounted on it. It also has a 'dozer blade that hangs from the front axle and attaches to the frame just ahead of the rear wheels. I think the thing was some sort of commercial conversion because there's a tag on the firewall that says "Kaiser Jeep Corp. Special Sales Order No. D-3428-1", and the frame has been plated (very professionally) with 3/8" steel from front to back.
The hoe has a tag that says "Go-For-Digger", but I found no markings on the blade. They both seem to be the same color, though (industrial yellow, now faded to an eye-repelling pink. The Jeep's green). The are powered by a pump mounted on the front bumper driven by a shaft connected to the harmonic balancer. Any info anyone has on this or similar machines would be greatly appriciated.
The previous owner had stripped everything off the Jeep, and almost all the hydraulic lines (and lots of fittings) are missing and will have to be fabricated.
The problem is that I'm having trouble plumbing the thing.
My first problem is that the pump has one suction port and two pressure ports. I believe that one is a low pressure/high volume port, and the other is a high pressure/low volume port. Is this common in a backhoe application?
The second problem is that some of the control valves seem to be of the power-beyond type (I think). I'm fairly familiar with how open-center systems work, but I've never figured out what is significantly different about a power-beyond system (anyone feel like tackling an explanation of the subject?). Here's a breakdown of the different valve bodies:
The valve that runs the blade lift seems to be an open-center type (1 IN port, 1 OUT port, 2 cylinder ports) with some sort of pressure adjustment.
The valve that tilts the hoe (the hoe rolls back in the bed for transport) seems to be a power-beyond type (1 IN port, 2 OUT ports, 2 cylinder ports), also with some sort of pressure adjustment.
The main hoe valve bank has 6 valves (left stabilizer, right stabilizer, bucket, dipper, boom and swing). The return (a single large port) seems to come off the center of the valve assembly, but there are two smaller ports (presumably one or both are supply), one on each end of the valve body. Are these for the lines coming from the high pressure and low pressure ports of the pump? If so, how do I tell them apart? Or is this what a multi-valve bank looks like in a power-beyond configuration? Does this mean that there are two return ports? Again, how would I tell them apart? Also, which pressure should I run the blade and tilt cyl. from?
Experimentation to find the right setup could get expensive in a hurry. Last time I had a hose made up it was about $1/inch for 2-wire 1/2" hose (plus fittings), and steel lines are a pain to work with. Also, this thing is a hodge-podge of sizes (3/8", 1/2", 1") and fitting types (pipe, JIC, some sort of o-ring).
Any info on anything here will be greatly appriciated. I hope to get some pics up on a web site soon. If you want to see them drop me a line and I'll let you know the URL when I get one.
Thanks in advance.Thought for the day:
He who dies with the most toys is, nonetheless, still dead.
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