Question on a Kubota B2400 Loader Valve

[Dwarner]

I recently picked up a Kubota B2400 with a LA351 loader. My problem is when the loader valve is in the float position the 3 point stops working all the hydraulic fluid is sent back to the tank. With the loader valve in any other position the 3 point works correctly. The loader valve has ports marked IN and OUT for hydraulic fluid. A, B,C, D for the hydraulic cylinders and for power beyond the port is marked DFP which is an identification I have never seen before. Could this valve be missing an internal power beyond plug?
The id tag on the valve LM305B and under that is 1625AG

 

[Russell King]

I have no idea on your problem but hopefully @TheOldHokie will be able to help you out when he is back. Others may be able to help you also

 

[North Idaho Wolfman]

My problem is when the loader valve is in the float position the 3 point stops working all the hydraulic fluid is sent back to the tank.

That sound like normal (yet not ideal) operation.
It's very common for loader valves to override normal operations under certain situations.

 

[TheOldHokie]

I recently picked up a Kubota B2400 with a LA351 loader. My problem is when the loader valve is in the float position the 3 point stops working all the hydraulic fluid is sent back to the tank. With the loader valve in any other position the 3 point works correctly. The loader valve has ports marked IN and OUT for hydraulic fluid. A, B,C, D for the hydraulic cylinders and for power beyond the port is marked DFP which is an identification I have never seen before. Could this valve be missing an internal power beyond plug?
The id tag on the valve LM305B and under that is 1625AG

Thats not "normal". Float is typically

A,B->T
P->PB.

Thats certainly true on a LA525. Can you operate the bucket when the boom spool is in float?

I dont see a PB port in your pictures.

Dan

 

[Dwarner]

Thats not "normal". Float is typically

A,B->T
P->PB.

Thats certainly true on a LA525. Can you operate the bucket when the boom spool is in float?

I dont see a PB port in your pictures.

Dan

Sorry for my delay. This valve does not have a port marked PB the port is marked DFP. I will not be able to check if the bucket will operate with the valve in float because I'm in the process of removing the transmission because the 4 wheel drive is stuck in gear. I believe the lever dog came out of the gear.

 

[TheOldHokie]

Sorry for my delay. This valve does not have a port marked PB the port is marked DFP. I will not be able to check if the bucket will operate with the valve in float because I'm in the process of removing the transmission because the 4 wheel drive is stuck in gear. I believe the lever dog came out of the gear.

Sorry for my delay. This valve does not have a port marked PB the port is marked DFP. I will not be able to check if the bucket will operate with the valve in float because I'm in the process of removing the transmission because the 4 wheel drive is stuck in gear. I believe the lever dog came out of the gear.

Whatever its marked you should hsve 3 ports connected to the tractor - pressure in, pressure out, and tank return.

None of the boom functions should block thd 3pt. Bucket curl and dump should block the 3pt for the period of time the cylinders are in motion but thats so short most people never notice.

I will double check float on my LA525 later today but the WSM seems pretty clear. Do you have a WSM for your loader?

Dan

 

[TheOldHokie]

Sorry for my delay. This valve does not have a port marked PB the port is marked DFP. I will not be able to check if the bucket will operate with the valve in float because I'm in the process of removing the transmission because the 4 wheel drive is stuck in gear. I believe the lever dog came out of the gear.

Confirmed the 3pt lift works fine when LA525 boom is in float.

Pretty easy to see what your valve is doing. Just disconnect the PB hose at the tractor and stick it in the transmission filler. PB flow should not stop when the valve is put in float.

Dan

 

[Dwarner]

Tractor is back together again and the bucket will dump while in float. It appears I was mistaken the 3 point does raise while in float. I did just replace the entire 3 point system on the tractor so it could have been air in the system or low oil. Still not sure about the port marking DFP on the power beyond port.
Thank you for taking the time. Dana

 

[Russell King]

According to the internet and AI it means this (but you still need to choose):

 

[TheOldHokie]

According to the internet and AI it means this (but you still need to choose):

View attachment 160182

I figured it was a makers mark of some sort.

Dan