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Offer was turned down....back to plan A. I would have changed the outriggers to angled (45*) like my boomtruck. Now they won't be as heavy to hold as much weight...but will still be at 45, just supporting a lighter crane.

The use of the dump valve on the manifold makes it work for either type pump. I haven't looked at the wiring diagram, but the operation of any other valve would have to close the dump valve so every valve must have an electrical switch. I've made an offer to buy one....the entire crane. I'm...

One more thing re your pump. The crane schematics give a flow rate in GPM for every function. The largest I see is 12 GPM. Don't get a pump too much larger than that or the bypass valve will not relieve the pressure. Get a pump around the 12-15 gpm range. Compare to the M929 pump at about...

Very Good! That's much help/ Picture 5 and 7 especially helps me to see the hookups. The small line coming from the winch motor valve is the brake releasing line and the line from (what appears to be motor case drain) goes to the outermost port on the brake. This confirms the schematic. I...

It all comes down to the bypass valve. It opens a flow path from P to T in normal position. Any function, including dump, has to also close that bypass so it will build pressure.

Okay....going back through I see a little bitty note that says: "Hydraulic system is in by-pass mode when hydraulic system no longeroperates." So there is a bypass mode (a separate valve) that takes the place of "open center". Your function valves will still show a closed t port, but flow is...

Here is one that would work with a positive displacement system. See the P goes back to tank? If yours are like this,they will work with the gear pump. I'll wager they are blocked.

I went to the schematic on the Grove Crane to confirm. The valves all have blocked pressure ports in the centered position. There are no specs for a 939 series with a pressure compensated system that I have ever seen. I don't know of any gear pumps that can be pressure compensated. They...

Lowering the boom while having it straight with the truck might be hazardous to the back of the cab.

You need a picture of the top of one of the valves. The industrial valves have a flow diagram on top. If the pressure (P port) shows a -T, it is blocked. If it shows the P port connected to tank, then it's a positive displacement. A hydraulic schematic for the crane would help a lot. What...

Sounds like a great project. Figure the volume of the cylinders in cubic inches (pie R square x stroke in inches) / 231. I'd have at least 2x the total volume or more. Do you have the crane winch already connected with hydraulic lines? I'm working on a Grove Crane winch and trying to...