one more hydraulic question

[hill]

What a perfect T&T valve this is:Surplus Center Item Detail!

I'm taking it that the 17+" dimension shown for it is the height from bottom to top of handle, correct?

 

[kennyd]

I am sure the 17" inludes the handle-but they are very helpful on the phone if you call them.

 

[Bird]

Ron & Mike, for this application, the B2910 is just like my B2710 and you do not need power beyond or a 7th hose to return to sump. You can see a picture of the valve I used in the photo section of TBN here. You can see the two hoses going down inside the fender which go to the hydraulic outlet that's been discussed. The four hoses going to and from the two cylinders are connected on top of the valve and you can also see those 4 hoses here. Six hoses total.

 

[canoetrpr]

What a perfect T&T valve this is:Surplus Center Item Detail!

I'm taking it that the 17+" dimension shown for it is the height from bottom to top of handle, correct?

This has been an interesting thread.. Another newbie here that is looking into getting remotes.

I was thinking of getting a 3 spool valve. Two for TNT and one for ?? Considering I didn't think I "needed" remotes - figured I would add a third spool.

Silly question. The valve above has only one joystick but two spools. does this work just like a loader valve - vertical and horizontal for the two different work ports?

 

[RonMar]

This has been an interesting thread.. Another newbie here that is looking into getting remotes.

I was thinking of getting a 3 spool valve. Two for TNT and one for ?? Considering I didn't think I "needed" remotes - figured I would add a third spool.

Silly question. The valve above has only one joystick but two spools. does this work just like a loader valve - vertical and horizontal for the two different work ports?

Yes it does, left-right is one spool, front-back(up/down) works the other.

 

[gotrocks]

I'm getting closer, but now I would like opinions on the size of cylinders to order.

Here is one spec for side link:
SPECIFICATIONS Double Acting
Bore/Stroke 1" x 4"
1500 PSI working pressure
Rod dia 1/2"

• Ports 1/4" NPT
• Retracted Length 10 1/2"
• Shpg 6 lbs

END MOUNTINGS

• Rod End Clevis
• Pin holes 1/2"
• Outside Ears 1"
• Inside Ears 1/2"
• Throat Depth 1"

• Base End Clevis
• Pin holes 1/2"
• Outside Ears 1"
• Inside Ears 1/2"
• Throat Depth 1"

Is this heavy duty enough for side link?

I am considering this one for top link, What's your ideas on this choice?
SPECIFICATIONS Double acting
Bore x stroke 1-1/2" x 14"
PSI max. 3,000 Rod dia. 1"

• Ports SAE 6
• Retracted length 21-1/4"
• Shpg. 12 lbs.

END MOUNTINGS

• Rod end swivel-ball
• Ball width 1"
• Ball O.D. 2"
• Pin hole 0.75"

• Base end swivel-ball
• Ball width 1"
• Ball O.D. 2"
• Pin hole 0.75"

Should I be looking for 3000 psi and 1" Rod dia on both
OR would 1500 psi and 1/2 " dia be satisfactory?

I do appreciate all replys so let em rip.

 

[3RRL]

If it were me I would definitely be looking at minimum Ø1" rods or larger for the side links. The top link is OK IMO. As far as the pressure rating, what is your tractor's system. You want to match or exceed that.

 

[RonMar]

What Rob said... The side links can come under considerable pressure and a small rod may fold up when you turn the wheel and push that box blade sideways across the ground with a load of soil in it.

 

[fiddler kelly]

I am asking thie question just to see if I am understanding some of what I have read on this site. If I wish to hook up a hydraulic thumb to my BH would I have the return line from my BH, which brings the fluid back to the tractor, go to the valve for the thumb then the line go from the thumb back to where the return line would have hooked up to bring the fluid back to the tractor.

Now that valve that the return line is connected to should allow the fluid to run freely until the thumb is needed. Then the fluid will be redirected by the valve up to the ram to open or close the ram then the fluid going back and continuing back to the tractors resevoir .

Sounds simplistic but is this how it works? My tractor is a B2630 model year 2006.

Is that valve one which sits upright and if moved one way the ram opens and if moved the other way the ram closes ,unsure as to the technical name for the valve

 

[RonMar]

That would be a single spool open center valve, 3 position, spring centered to neutral. Your grasp of how it works is correct, but it depends a lot on the hoe valve capabilities and how your hoe valve is plummed into the system. Most valves with just a single input and return line as you have described are not rated for much pressure on that return line. It is typically supposed to take a low restriction path back to the reservoir. By putting a valve on that return line, you could cause excessive back pressure to parts of the main hoe valve and do damage to it(usually spool "O" rings).

A place where you could put your single spool valve would be on the input line. This side is rated for high pressure. You would need a single spool valve with "Power Beyond". Power Beyond is simply a high pressure path thru a valve from the high pressure inlet. A power beyond valve has 3 main lines. A high pressure Supply inlet, A High pressure PB outlet and a low pressure return. The return line is the fluid comming back from a moving cylinder or from the relief. Any back pressure on this line reduces the force applied by the cylinders so it must be a unrestricted outlet to the reservoir.

The input that now feeds your hoe valve would instead go to the new single spool inlet. The hoe valve input would then be connected to the PB outlet of the single spool. The Return line could be "T" d into the hoe valve output providing it is a low pressure return to the tank.

Another option, depending on your valve make, might be to get another section for your hoe valve and add another spool/lever to the stack for this function.

Yet Another option would be to get either a manual or electric dual selector valve. Surplus Center Item Detail This valve has 6 ports. 2 connect to the work ports on your hoe valve. 2 connect to the cylinder that used to be connected to the hoe valve where we connected the first 2 ports. The last 2 go to the new cylinder. This would allow one of your existing functions, such as one of the outrigger arm levers, to switch functions with a simple lever movement and function as the thumb control untill switched back.

You might get more answers if you start this as a new topic in the hydraulics forum.

 

[fiddler kelly]

Ronmar I remember when I disconnected my backhoe from the tractor for the first time there is one line coming back, well actually two , but this one when disconnected foaled back to the tractor and connected to the other line coming from it. That other line which I connect to when backhoe is diconnected goes back to the side of the tractor and into the side of the tractor /transmission, would that be the return line.

I am going to attach a pic of where the lines all come off where they connect into this block am I am wondering if what I am see are two extra ports for hooking up extra lines.Where would be a good place to mount the valve to control the hydraulics for the thumb on the BH.

These two extra ports I am wondering about are the two bolt heads in the center of that block with lines on the top and bottom coming off from it.

 

[RonMar]

Those bolt heads in the picture look like the bolts that hold that interface block in place. An adapter block is used to interface from basically bare holes in the side of a machine or valve body to particular threaded ports, or a machined feedthru plate can be bolted into place to allow the fluid to flow from one port to another if no connection is needed at that location. As for plumbing on your tractor, I would consult with a dealer or manual as to the particular suitability of a port to add a valve into.

I still think the easiest way to add a thumb circuit in your case would be to add a dual selector valve to one of your other functions. An outrigger control seems the most likley candidate to me, as it is only used when moving/setting up the hoe, not really during actual operation. Setting up one of the outrigger levers to be able to switch between control of the outrigger or the thumb with the push of a lever, would be relatively easy and not require any changes to the main lines between hoe valve and tractor.

Since the main hoe valve probably has parallel passages which allow multiple functions at the same time such as boom up and boom left/right, using one of the valves on the main hoe valve to control the thumb seems like a good idea to me. This would allow you to curl the bucket and thumb at the same time. Placing a separate valve on either side of the main valve would most likley give priority to one valve or the other allowing only one to move at a time as the upstream valve robbs fluid from the next valve in line.