Powering a dump bed with m925 hydraulics + adding auxiliary circuit

Pulled the fifth wheel off my m923a2 to put on a 10yd Heil dump box. Finishing up a new subframe for it now, and am tackling the hydraulics next. From my m936 donor, I pulled the winch, controls, and transmission PTO which are all mounted up now. What I would like to do (if possible) is use that PTO and controls to also power / control the dump bed, along with adding an additional hydraulic circuit to power tools like a hydraulic jack hammer, or post setter.

Is there a slick way to do this?

The dump bed subframe already has a hyd. tank built in and a control valve for the cylinder.



Was in a pinch and have been using the truck without the dump ram, using the 936 crane to tip the box. Ready for this thing to dump under its own power!

You just use a selector valve to send fluid to whatever side you want to operate after your pump. Pull the handle in the cab for bed. Push the handle in for winch flow

Or get a two or three way valve. Each handle has it's own operation

Sent from my SM-G965U using Tapatalk

You need to know if they are both open center valves. Like Wes said you need a two position, 2 circuit selector valve. If the bed valve is a closed center, then use the valve from the 936 and put the selector valve after the main valve (that came with the PTO)(it is open center). That eliminates the one with the bed and would go direct to your cylinder.

Is it a push only type extension cylinder? Does it have a pilot check at the base of the extension cylinder?

If they are both open center, the selector valve goes after the pump but before either valve (both are used).

Hey RG! Good to hear from you. Was wondering if you were still sucking air.

Here is an example of a hydraulic selector valve, $99:

https://m.northerntool.com/products...Machine Selector Valves&utm_source=Google_PLA

simp5782 said:

You just use a selector valve to send fluid to whatever side you want to operate after your pump. Pull the handle in the cab for bed. Push the handle in for winch flow

Or get a two or three way valve. Each handle has it's own operation

Sent from my SM-G965U using Tapatalk

Click to expand...

I did that at first it works for a cheap solution. I ended up putting a 3 spool control valve with power beyond on and plumbing the pump to it first and then to my winch valve. Everything works mint np stopping and switching and the 3 spool is set to a different relief pressure with it's own return to the tank. The winch relief stays the same that way. It allows for much better flow that way to. The selector valves are restrictive. Another suggestion is to find a way to vent the tank.

Sent from my SM-G892A using Tapatalk

Also the winch valve doesn't hold in neutral so as soon as you quit lifting it will come right back down.

Sent from my SM-G892A using Tapatalk

https://r.tapatalk.com/shareLink?ur...share_tid=171373&share_fid=20191&share_type=t
Here's my run at it

Sent from my SM-G892A using Tapatalk

farmerboywyotech said:

Also the winch valve doesn't hold in neutral so as soon as you quit lifting it will come right back down.

Sent from my SM-G892A using Tapatalk

Click to expand...

That needs a pilot operated check valve....same as the ones at the bottoms of cranes and some dumping cylinders. It takes pressure on the reverse to open it.

This winch is a crane winch and locks the load, so it takes reverse pressure to move. The brake only locks in the pull direction....has a one way clutch inside.