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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...

They should fit. I use the HMMWV wheels on Dexter axles, so there are a lot of trailer rims that do fit also. It's probably one of the best for what you want because of the surge brake and the free reversing in the brake mechanism.

Rusty, I talked to an engineer at a spring company and emailed him a link to your thread, since you show the simple torsion spring and gate setup with the hinge rod, quite clearly. We focused on having the arms at 180* (with about 10 ft/lb holding it shut) and I made some estimates of the...

If they take the 39590, they are 4.4375" OD, same as the M105A2 hub and the M35, they are likely to interchange, if you use the M105A2 bearings. Clearly the axles have different diameters...no problem. Now the question for both the M35 and M135/211 hubs and the M105A2 hubs, is the spacing of...

Okay, using those numbers I see all three have 4.375" outer diameter but they vary for the inside diameter. The deuce inner is 2.625" and outer is 2.4375". The M105A2 is 2.625 inside diameter both inner and outer. Bearing widths are the same. So, while not considering the width of the...

Back to dish out wheel use. Instead of machining off the flange, as I proposed, would the hub from the deuce fit our 105 axle? "Reversed" of course? I go to the TM that G has posted and find the bearing numbers on each A1 and A2. Unfortunately they don't mean much to me. The A1 has 702, 704...

Did you miss the part that they will be identified by not having the 17 digit vin number? That rather well includes most of our trucks.

I've emailed Indiana Senator Randy Head asking him to champion a law in Indiana that takes the fact the government has just sold several billions of dollars in equipment to us. Maybe we can be proactive, not reactive, since highly regulated states are taking the rights to use them "on road"...

Good work Rusty. I was sales manager of a spring co for one year after school and learned a lot about springs. I even had a patent being issued on bandsaw blades that used spring theory to go very thin and run at ultra high tension, but not break the blades...and proved it worked. The...

Fixed flow and variable flow are two entirely different animals. Fixed flow will not work because the valve pressure port is blocked when the valve spool is in the center position. No flow is allowed to pass. If you have a fixed flow (gear) pump, it simply stalls the engine or breaks. If...

Sure, you got the PTO from me and that is partly why I don't want to see you get the wrong pump. But I'm pretty much the same with all people here, will help when I can. My purchase of the winch unit and determination to make it work has a lot to do with working these issues out too. Your...

Not having read the wrecker TM, my observations have been that they use gear pumps, off the tranny and the transfer case. They are positive displacement and not compatible with the valving of the crane that was made for LMTV and HEMTT, with pressure maintaining(compensating)(but 0-full) flow...

I don't think you understand what I'm saying about the pump. Yes the driveshaft has to be used because there is not room to flange mount a pump, but if you purchase a pump from a 5 ton 939 series, they are gear pumps...they won't work. Tell your hydraulics man you need a pressure...

Here is what I'm using. Caution when you get the pump that it's direction is correct. Oh yea...and mine is a lot less flow for smaller stuff...like my 2" cylinders that I have 25 of.