help with dump pto

Not being sarcastic...have you googled yr plight? Maybe contacted the pump manufacturer?

 

That round unit between the pump and the driveshaft(the unit with the wire going to it)is an electric clutch,like you would have on an air conditioner compressor, there has to be a switch somewhere to turn it on and off. Where does the brown wire on the floor by the 3 levers go?

 

Looking at it again,I think each lever is supposed to engage and disengage the pump, if you can pull the rubber boots up on the levers,you'll probably see switches on each side of the stick. You need to get the manual on the unit to figure out how to troubleshoot the system. That large metal screw sticking out of the clutch assembly doesn't look like it belongs, maybe someone rigged it to work full time. If you need to replace the clutch, it looks like a job(meaning not easy). It could also be something simple, try to get the service manual or at least the operators manual.

 

That looks like a fulltime system, the other one had a clutch and an actuater that engaged and disengaged the electric clutch when the levers are pushed. You can't even put a shutoff on that system or you'll blow a line or worse burn up the pump.

 

Don't know what type truck it is I might say International which makes no difference but that round part is a clutch and it is suppose to go on and off when the levers are moved. It appears as though someone at some time has use that screw to lock the pump on. That is what is refered to as a live pto. The old Oskosh we have at the ranch in Gunnison CO does not have that clutch although its spool valve for the blade, dump and wing attachment has a built in bypass so it cant damage the pump by dead heading it. I am guessing that the spool valve those three levers operate has the same features that the spool valve in the Oskosh has. From what you said obviously the truck runs ok. If that pump was dead headed it would probably kill the engine every time you attempted to start it. Unless you intend on using it to drive distances of more than 15 miles one way 30 total it should be ok unless the hydraulic temp gets way to high say over 250 degrees. That system is obviously Seely I'm sure they still use it today. Should be able to find it online.