FLOAT CONTROL

[NELS1]

Hello All, I just installed a new control valve on my B7200 HST Kubota with a B1640 loader and everything is normal except the float position. If I put the loader down and push through the detent into the float position the loader raises. Did I hook up something wrong or did I get the wrong valve from Surplus Center?
Thanks for any help.

 

[J_J]

Is your 3pt in neutral?

Re check all your QD's

 

[murphy1244]

:welcome:

 

[J_J]

Sorry, I said Prince earlier, but it is a Brand valve, and it looks like the PB adapter is installed

Is your 3pt in neutral?

Re check all your QD's

 

[NELS1]

yes in neutral . What to check on the QD's ? Everything works as it should except the float . Put the loader down and keep depressing the handle through the detent and the loader raises.
Thanks for the reply , I see from the other posts that you know a lot about hydraulics.

 

[NELS1]

:welcome:

Murph , thanks for the welcome ~ Nels

 

[J_J]

Surplus Center - 2 SPOOL COMPACT 10 GPM JOYSTICK CONTROL VALVE

http://www.surpluscenter.com/Instruct/I9-7401.pdf

All ports are common when in float, and the fluid flows to tank

Do you have a hyd gage that you can put in a tee in the IN port.

Pressure is coming from somewhere. Maybe back pressure.

Does the loader have much force when you push the lever full down/float?

 

[NELS1]

Surplus Center - 2 SPOOL COMPACT 10 GPM JOYSTICK CONTROL VALVE

http://www.surpluscenter.com/Instruct/I9-7401.pdf

All ports are common when in float, and the fluid flows to tank

Do you have a hyd gage that you can put in a tee in the IN port.

Pressure is coming from somewhere. Maybe back pressure.

Does the loader have much force when you push the lever full down/float?

JJ Thanks for the help. The loader does have a lot of force when pu tin float. Wouldn't a pressure guage just show that I have pressure? Or does it drop when put into float? Sorry , I'm not well informed in hydraulics but now knowing that the fluid is supposed to neutralized will be a big help.
BTW.. What is regen? Guess it can't be as simple as hoses hooked up wrong (g) Thanks again ~ Nels

 

[Farmerford]

Nels:

I am not familiar with your valve, but in some valves the "float" function connects the work ports and the pump (inlet) port to tank so that the pump provides fresh fluid when needed for the float rather than having fluid drawn backwards through the discharge filter. In that case all the pump flow is through the tank or outlet port rather than the power beyond port. If there is any restriction in the flow path it will cause pressure build up in the tank bores in the valve which would cause the boom cylinders to extend.

The only thing you have said that is inconsistent with a restricted tank circuit is that the valve works normally in all functions except float. A restriction should make all the valve functions either completly ineffective (a full restriction) or slow and weak (a partial restriction).

The instructions for your valve indicate a socket head (I assume) pipe plug inside the tank port that should be removed for power beyond operation. When you installed the power beyond plug, did you also remove the pipe plug from the outlet(tank) port before connecting the tank hose to the port? If you did not, remove the tank hose and look down inside the tank port on the valve; you may see a pipe plug (probably 3/8 or 1/2 inch) that you can remove with a hex wrench.

Good luck.

 

[NELS1]

Nels:

I am not familiar with your valve, but in some valves the "float" function connects the work ports and the pump (inlet) port to tank so that the pump provides fresh fluid when needed for the float rather than having fluid drawn backwards through the discharge filter. In that case all the pump flow is through the tank or outlet port rather than the power beyond port. If there is any restriction in the flow path it will cause pressure build up in the tank bores in the valve which would cause the boom cylinders to extend.

The only thing you have said that is inconsistent with a restricted tank circuit is that the valve works normally in all functions except float. A restriction should make all the valve functions either completly ineffective (a full restriction) or slow and weak (a partial restriction).

The instructions for your valve indicate a socket head (I assume) pipe plug inside the tank port that should be removed for power beyond operation. When you installed the power beyond plug, did you also remove the pipe plug from the outlet(tank) port before connecting the tank hose to the port? If you did not, remove the tank hose and look down inside the tank port on the valve; you may see a pipe plug (probably 3/8 or 1/2 inch) that you can remove with a hex wrench.

Good luck.

Wow , I missed thaat one. As soon as it stops raining I will remove the hose and see if there is a plug. Thanks for the advice.