5115M Rear SCV float mode question

[UP Josh]

Hi all,

On my 2022 5115M the float mode on the rear SCVs acts significantly differently than it did on my Kubota L6060. The difference is that when it's in float (pushing the SCV lever in the cab into the forward detent position, which happens easily), the operating cylinders on the implements (rear blade, hydraulic top link) do not float freely, they will float if I put an very large amount of pressure to push or pull the cylinder open or closed.

On the L6060 I would be able to push the rotate left/right cylinder on my rear blade with one hand with barely any pressure when the SCV was in float mode. On the Deere I can barely move it when I put all of my weight into it.

The tech tells me this is normal due to the design of the rear SCVs on the Deere. This is my second personal tractor so I don't have anything else to compare it to, so I wanted to ask if this is indeed the case, why did Deere design it this way?

The levers go into float easily, it’s the implement cylinder that requires an enormous amount of force to travel once it’s in float mode. There are no check/lock valves on the implement side. The same cylinders floated freely without effort on my L6060.

Thank you.

 

[hayden]

Do your SCV valves in the back have a black knob on the top? It may be set incorrectly for float.

Some also have a flow control knob. If the flow is dialed way down, it will probably cause float resistance.

 

[workinonit]

Typically only one of the SCVs is selectable like the above post. All three of mine have float and they work as you would expect float control to work. I use mine all the time when I'm lowering the batwing FM or lowering the disc. I just push into the detent and when the implement is all the way down they pop out of float. Float also works on my joystick for the loader functions. I think there is an adjustment knob on the back to control the rate of fall for the SCVs. I know mine has one. It's right under the right 3 PH lift arm I think.

 

[UP Josh]

It does have the selective control valve knob for adjusting one of the SCVs into continuous, no, or automatic and I have tried all three positions. Also, the manual states that "Detent settings affect only extend and retract lever positions, not "float."

I have also adjusted the flow control knob on the SCV bank which should also only affect one SCV and the behavior does not change.

For clarity, when I have an implement hooked up and the hydraulic top link SCV is in float position, the cylinder will extend to float, it just takes a LOT of weight / pressure.

I'm unable extend that hydraulic top link by hand when the SCV lever is in the float position. This is very different than my L6060 and I'm looking for any additional information on this to validate what the technician told me is normal.

workinonit - any chance you can tell me more about the knob under the right 3PH lift arm for controlling rate of fall for the SCVs? I'm not seeing anything in my manual about that and that would be a curious spot for a knob to impact SCVs? You're not talking about 3PH rate of fall are you?

Thank you.

 

[hayden]

So it's a hydraulic top link that you are trying to float? Does it have a lock valve on it like circled in the attached? If so, that does exactly what you describe. It will only allow oil to escape from one side if you push it in the other side. So you can't float it.

 

[UP Josh]

A hydraulic top link as well as a rear blade cylinder, both of which floated perfectly fine on my Kubota L6060. They also will float with the 5115M when extreme amounts of pressure are applied. The hydraulic top link will float when a heavy implement is attached, I'm just unable to extend and retract the cylinder by hand. I'm also unable to extend or retract the cylinder on the blade by hand without extreme pressure.

 

[oldnslo]

Will it float in either direction? I.e. push in but not pull out?

Just asking since a partially seated quick disconnect or a failing disconnect will gave this effect on float but should have less effect in direction than the other.

 

[UP Josh]

Will it float in either direction? I.e. push in but not pull out?

Just asking since a partially seated quick disconnect or a failing disconnect will gave this effect on float but should have less effect in direction than the other.

No and the behavior is the same across all three SCVs, thank you for asking.

 

[workinonit]

I've never adjusted that knob but I'm pretty sure that's what it's for. I'll have to pull my manual out and look at that knob. Do you have a loader? Does the bucket float as it should?

 

[UP Josh]

I do have a loader and the bucket does float as it should.