Sherman backhoe - PTO pump mount hyd selector valve?

Posted by MeAnthony on May 03, 2020 at 16:51:00 from (204.106.253.41):

I've recently bought a Sherman Power Digger 54B900. The Prince HC-PTO-4 pump seems to work correctly, as I did get most of the cylinders to operate. The pressure gauge showed 500 psi but also stuck afterward, so I plan to replace that anyway. The pump has a PTO adapter/mount that bolts to the back of the 9N, which is great. However it's 1 1/8"; I just bought a new 1 3/8" PTO unit from YT. I did slide the 1 1/8"-to-1 3/8" PTO adapter into the other side of the pump to verify size. But... I can't use my new PTO unless I can get the current PTO adapter/mount out of the pump. What the heck holds it in there??

I am trying to find a manual/parts diagram for the Sherman 54B900. I've seen links for models like 54C100 but nothing for 54B900 and don't know how similar they are.
I've emailed Prince Hydraulics asking for a spec sheet and parts diagram for the pump, no response yet.
One of the hydraulic valves has a selector on it. The hose on the back (bucket curl) is near the top, the hoses on the sides (outriggers) are closer to the bottom. I assume the little nubbins have to be lined up with the hose to operate the corresponding function. I assumed I had to line up with the hose out the back; that only gives me bucket curl and one outrigger. It just occurred to me that I probably have to line up a nubbin with each lower side hose for each outrigger. I had not tried that; good chance I may be retarded. Can anyone clarify the operation of this little gizmo?
I do have the frame/running gear from an old Gehl grinder/mixer. I'm seriously considering mounting the backhoe on this instead of on the 9N. It would essentially be a towed backhoe with the pump mounted close to the front of the frame and run with a standard PTO shaft from the tractor.
The subframe on the tractor that the backhoe is supposed to mount on... I want to slightly modify that but keep it on the tractor. I'd like to put a crossmember where the drawbar mount is on the newer tractors and install the same kind of setup that's on my brother's '53 Golden Jubilee.

Thanks; your time and suggestions are appreciated.

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