Selective Control Valves (SCVs) Educate me please!

[454shooter]

I know I have been asking a lot of questions lately but I am told that knowledge is power. Question today is the 3720 that I am soon ordering says that it has a dual mid and single rear SCV. I will also have power beyond for the 448 hoe and it will have a mid mount mower that will be taken off in the winter (if that matters). I take it that the dual SCV is for the loader (lift and tilt). Future attachments that I want to be able to control is a meyers power angle plow adapted to the loader in which I will need to angle both ways while still being able to lift the loader arms and at the same time have a snow blower on the rear with possibly a hydraulic controlled chute (rotation and angle of discharge). As I won't need to tilt the meyers blade, will I be able to disconnect the loader tilt and use it for angling of the blade? Or will it only angle one way?
I also have an 8' Land Pride rear blade that I may wish to add a cylinder to for angling. Will the single rear SCV control either the blower or angling cylinder and is there a seperate lever that operates the rear scv?
Another possible add on would be a hydraulic top link.
Do I need to order additional SCVs?

Thanks in advance for any help you can provide.

Shooter

 

[beenthere]

I'm not sure I can answer your entire question, but as far as the dual SCV, I use mine (with the FEL off) in the winter to angle my Western plow (the curl side) using the conventional angling cylinders, and I use one port of the up/down side to raise the one-way cylinder to lift the plow. Another member used a dual ram on the up/down so he could get down pressure on his blade if desired. Someday, I may do that, but see no real need for it yet.

Sounds like if you mount the plow in place of the bucket, you will need to tie or bolt down the curl feature, so you can use that curl side for the plow angle. If me, I'd look at mounting the plow in place of the FEL, not attached to it. But that is just me.

Your single SCV on the rear should work great for the hyd chute adjustment. So you should be good to go.

 

[jeffinsgf]

Third SCV at rear will handle your hydraulic top cylinder. I just hooked one up like this. Pics and project notes in a day or two.

The factory 4th & 5th are controlled by a switch on the right fender (with the other control switches) that toggles the joystick between the mid pair (loader controls) and rear pair. It is kind of pricey, too. I had planned on using a CCM top and tilt kit to add another two SCV's, but the whole affair becomes quite complicated if you use your backhoe often. Removing the cylinders and lines is more than I want to do for the half a dozen times I might want to angle a rear implement. I'll just do it with the screw adjustment. Now, the top cylinder is a different story...it took me about 5 fast seconds to fall in love with that. I made up hoses that snap into the 3rd SCV and that part can come off about as fast as the mechanical top link.

 

[KennedyDiesel]

The OEM dual SCV's are mid mount, and best suited for front and mid mounted hydraulic applications.

The Deere electric diverter kit takes these same functions and moves them (selectable vis switch) to rear mounted couplers which are still controlled by the joystick.

You can also add a single rear SCV that is controlled by a level alongside the 3 pt height lever. This control has 2 directions plus a "float" position.


You could put the Meyer plow on your loader and use the mid SCV's to lift and angle it (with the addition of 3rd function lines on the loader) BUT you'd lose the roll back control of the "bucket" brackets. To gain full control out front, you'd probably want the Mid SCV's to control normal loader functions and add a 3rd SCV to control the blade angling. This leaves nothing for rear functions.


If you want maximum capability, I'd suggest adding the electric diverter and 3rd SCV as well as the 3rd function lines on the loader. Then you can run the normal loader functions with the mid SCV, and loop either the 3rd 4th or 5th function to the loader's aux lines to angle the blade. You'd have 2 functions available yet to angle the chute or top link/tilt link.

Note: Where the couplers are mounted does not matter as you can loop hoses to wherever you desire. Practicality is what will dictate where you plug implements in.

 

[hhw]

When you switch to the plow on the loader, make sure you engage the "regen" lock or you could experience some difficulties. There is a long lengthy thread on "regen" with lots of good info. Do a search out to at least march using "regen" and you should locate it. /forums/images/graemlins/grin.gif

 

[454shooter]

KennyDiesel,

As the plow would be lifted with the loader arms would it still be necessary to have the 3rd function lines?

I don't exactly understand the 3rd function lines and how they are controlled.

Shooter

 

[KennedyDiesel]

You will need to either mechanically lock the bucket tilt cylinders or have them active to control the rollback pitch of the blade so I see a need for 3 functions unless I am missing something.

 

[KennedyDiesel]

Here's a pic of the rear bar on my tractor. I still plan to add a Power Beyond so I can run chipper power feed w/o negating all other hydraulic functions and need for a bungee on the 3rd SVC lever. The top 4 are from the diverter. The lower RH 2 are the 3rd funct from the lever. The hoses loop under the tractor and come out above the mid SCV couplers.

 

[KennedyDiesel]

The couplers for the 3rd function loader lines are shown here.

 

[454shooter]

Thanks. Are the 3rd function lines controlled by the loader joystick?