BX2200 OEM Loader - Homework Assignment

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I think you are getting confused by a post from @Mountainman not @TheOldHokie

@Mountainman posted this. Notice that his POWER is pointing to the hose that is hiding and appears to go into the bottom of the small block. View attachment 141942

@TheOldHokie posted this. A is Tank, B is POWER, C is Power Beyond from valve (power to the 3 point hitch). I see that these two diagrams are the same. I see your diagram as incorrect. Notice that while there is a TEE IN THE POWER BEYOND there is only one line into that TEE so it is really a 90 degree fitting in function. (More below)
View attachment 141943
I think I was the one that said not to use a TEE in anything except the tank return. Specifically “don't TEE two lines into one outlet port of a TEE except for tank returns” would be a better way to say that. Using a capped TEE in the other lines is OK but inviting someone to make a mistake.

I hope this clears it up and doesn’t make it worse.

Thanks for clearing that up. It appears the PB & tank lines are currently installed backwards. The valve these lines are connected to was fitted way back before I bought it.

I should count my lucky stars that my pump still works at all. I've owned the machine for three years and god knows how long it was like that before I came along. Good thing I only used that rear control function once in a great while. The three point works perfect. Nice and strong.

Those lines will get switched for the final install once I get the rest of the parts sorted out.

Its been a three day crash course in hydraulics... Thanks again.

 

[Russell King]

Thanks for clearing that up. It appears the PB & tank lines are currently installed backwards. The valve these lines are connected to was fitted way back before I bought it.

I should count my lucky stars that my pump still works at all. I've owned the machine for three years and god knows how long it was like that before I came along. Good thing I only used that rear control function once in a great while. The three point works perfect. Nice and strong.

Those lines will get switched for the final install once I get the rest of the parts sorted out.

Its been a three day crash course in hydraulics... Thanks again.

I don’t know how you traced the TANK line nor the PB from the valve. Just be sure you are correct.

The valve may have a PB sleeve that is screwed into one T port of the valve so that can be confusing. I believe other valve brands have a N port that has the PB sleeve installed.

I am not that knowledgeable on hydraulics but ASSUME that if the tank return line from the valve was connected to where it should be the power beyond from the valve then the three point would not work properly. There would be no flow out of the tank return line unless the spool on the valve is in operation - as I understand it.

And as TheOldHokie said, you can get an Operator’s Manual and a Work Shop Manual for your tractor from Kubotabooks dot com and verify what you have been told. I suggest that you download them if you don’t have them already.

There are also simple ways to disconnect and test the lines on that block to be sure what they really are doing.

Good luck and I am glad you are getting the help you needed.

 

[922MB]

I don’t know how you traced the TANK line nor the PB from the valve. Just be sure you are correct.

The valve may have a PB sleeve that is screwed into one T port of the valve so that can be confusing. I believe other valve brands have a N port that has the PB sleeve installed.

I am not that knowledgeable on hydraulics but ASSUME that if the tank return line from the valve was connected to where it should be the power beyond from the valve then the three point would not work properly. There would be no flow out of the tank return line unless the spool on the valve is in operation - as I understand it.

And as TheOldHokie said, you can get an Operator’s Manual and a Work Shop Manual for your tractor from Kubotabooks dot com and verify what you have been told. I suggest that you download them if you don’t have them already.

There are also simple ways to disconnect and test the lines on that block to be sure what they really are doing.

Good luck and I am glad you are getting the help you needed.

Thanks for the follow up. As far as tracing the lines go. The existing control is about three feet from the block coming out of the pump. I could grab both ends of the lines so I'm very sure where they are coming from.

From the valve perspective. It's a BLB. They have dual inlet on both power and tank side. The PB adapters are an optional piece. You can see the adapters for my new FEL control in my second posting in this thread .

There is clearly one of the BLB PB adapter fittings on the top port, tank side of the existing valve.

After all the great advice, a good deal thinking, and multiple times examining the existing setup I'm feeling pretty comfortable in moving forward.

I doing a full rebuild on the FEL as well. Cylinders, control, straightening, and bracing. Not a cheap endeavor but less than a new FEL. It'll take a few weeks to pull together all the parts (never mind pay for them). I'll post some photos when I'm done.

 

[Mountainman]

I don’t know how you traced the TANK line nor the PB from the valve. Just be sure you are correct.

The valve may have a PB sleeve that is screwed into one T port of the valve so that can be confusing. I believe other valve brands have a N port that has the PB sleeve installed.

I am not that knowledgeable on hydraulics but ASSUME that if the tank return line from the valve was connected to where it should be the power beyond from the valve then the three point would not work properly. There would be no flow out of the tank return line unless the spool on the valve is in operation - as I understand it.

And as TheOldHokie said, you can get an Operator’s Manual and a Work Shop Manual for your tractor from Kubotabooks dot com and verify what you have been told. I suggest that you download them if you don’t have them already.

There are also simple ways to disconnect and test the lines on that block to be sure what they really are doing.

Good luck and I am glad you are getting the help you needed.

I am no expert in hydraulics myself but i have helped a few people that had the tank and PB swapped and the 3 point would work but wouldn't lift any weight. So while i can't explain it there is some low pressure flow coming out of the tank line. Maybe @TheOldHokie Could shed some light on that

 

[TheOldHokie]

I am no expert in hydraulics myself but i have helped a few people that had the tank and PB swapped and the 3 point would work but wouldn't lift any weight. So while i can't explain it there is some low pressure flow coming out of the tank line. Maybe @TheOldHokie Could shed some light on that

With a PB valve in neutral there should be no flow from the tank port. With the valve shifted and a cylinder moving you would get full pressure at the tank port. I would say something more was going on with those tractors.

Dan

 

[Mountainman]

With a PB valve in neutral there should be no flow from the tank port. With the valve shifted and a cylinder moving you would get full pressure at the tank port. I would say something more was going on with those tractors.

Dan

That makes sense. I have been told the tank was a low pressure return line which made sense to me sort of because for instance the b7100 with a b1630 loader having that adapter on the fill port for the return line wouldn't seem capable of handling high pressure. But if tank has full pressure when operating the valve then what is the power beyond doing at that point? I guess in an open center system i dont see the purpose of the power beyond when they worked fine before power beyond was a thing. Sorry to hijack the thread. Thanks for your input Dan

 

[TheOldHokie]

That makes sense. I have been told the tank was a low pressure return line which made sense to me sort of because for instance the b7100 with a b1630 loader having that adapter on the fill port for the return line wouldn't seem capable of handling high pressure. But if tank has full pressure when operating the valve then what is the power beyond doing at that point? I guess in an open center system i dont see the purpose of the power beyond when they worked fine before power beyond was a thing. Sorry to hijack the thread. Thanks for your input Dan

When a power beyond valve is in neutral the neutral (PB) circuit is carrying the pump flow snd nothing is coming out the tank port. When the valve is shifted some of the pump flow is diverted to an actuator (cylinder/motor) and all return oil from the actuator is sent out the tank port. If the valve is placed in a partially shifted position some of the incoming pump flow is also going out the neutral port. The purpose is to isolate actuator returm pressure from any back pressure generatex by a downstream valve.

There are multiple good reasons for that design over a valve where all outflow goes to a single port - not the least of which is the functioning of any inlet relief in the upstream valve.

Dan

 

[Mountainman]

When a power beyond valve is in neutral the neutral (PB) circuit is carrying the pump flow snd nothing is coming out the tank port. When the valve is shifted some of the pump flow is diverted to an actuator (cylinder/motor) and all return oil from the actuator is sent out the tank port. If the valve is placed in a partially shifted position some of the incoming pump flow is also going out the neutral port. The purpose is to isolate actuator returm pressure from any back pressure generatex by a downstream valve.

There are multiple good reasons for that design over a valve where all outflow goes to a single port - not the least of which is the functioning of any inlet relief in the upstream valve.

Dan

Your the man Dan. I appreciate that knowledge