M4950DT Loader Plumbing

[cmor]

Currently my M4950DT has a loader which is connected to one of the rear remotes. I would like to put a TEE in the supply line running to the back of the tractor and pipe it directly to the loader valve. This would free up both of the connections in the back of the tractor. Does anyone knoe what the size and style of the coupling that Kubota uses in the supply line? it looks like it may be a compression fitting.

 

[Russell King]

You can NOT put a tee into a supply (pressure) line.

The flow should be something along the line of out of the pump (pressure port) to a valve . Most modern tractors have a block with three ports one being from the pump. That line would go to the inlet port of the FEL valve (P) port, through the open center valve and out a Power Beyond sleeve (PB) that is usually an additional fitting installed into the valve. That would the go to the next valve (in your case the rear remotes) inlet (P) port, then out that valves PB sleeve and back to the tractor in port. That will then go to the three point hitch valve and dump into the tractor sump.

Each valve will have a tank return (T) port that will go to the tractor block to return low pressure flow out of the cylinders. This port is the only port that can have a tee into it (or the lines to this port can tee together).

You don’t mention having a backhoe so I am ignoring that.

Do you have an operator’s manual?

I will try to find a recent thread that shows the block on a tractor which may be similar to what you have. I do know that larger tractors in the M series already have a lot of the plumbing described above built into the tractor and that is a lot different from what I described.

 

[Russell King]

Here is a good thread to read through to gain some insight about what is needed for the hydraulic plumbing on many Kubota tractors

BX2200 OEM Loader - Homework Assignment

There was an OEM loader on my BX2200 when I bought it (1000 hours) with a separate hydraulic pump "MacGyvered" to the front of the engine crank. I want this gone and to use the hydraulics core to the machine for the loader. In addition, there was a hydraulic control on the rear of the machine...

www.orangetractortalks.com

 

[PoTreeBoy]

Assuming this parts diagram is correct, there is indeed a union 040 in the discharge line.

First, does your loader's valve have six or seven lines connected to it? Also, maybe a picture or two to confirm it has a pressure relief. Lastly, do you have the return pipe 080, it should be located on the transmission case.

If you have all the requisites, you would replace the union with two elbows. Then run a line from line 010 to the P port on your loader valve. Run another line from the power beyond (probably N) on your loader valve to the 050 line. Put male-female disconnects on those two lines so that they can be connected together when the loader is removed. Run a third line from the T port to line 080, this gives you a dump to tank. You'd probably want a quick disconnect on it for convenience, but it can be left closed off when the loader is off.

 

[TheOldHokie]

Currently my M4950DT has a loader which is connected to one of the rear remotes. I would like to put a TEE in the supply line running to the back of the tractor and pipe it directly to the loader valve. This would free up both of the connections in the back of the tractor. Does anyone knoe what the size and style of the coupling that Kubota uses in the supply line? it looks like it may be a compression fitting.

I looked at the parts diagrams for the hydrailic system and I think I understand the question. You cant just replace that union with a tee but yes are on the right track.. Can you post a picture of those pipes? The diagrams show multiple different options for that plumbing.

Kubota supplied an optional hydraulic outlet block for doing what you want but its pricey and availability may iffy. It essentially replaced that union. You may be able to plumb your loader valve in at the union without the block using ordinary fittings but you need to be careful and make sure you have the circuit routed correctly. Doing it incorrectly can damage or destroy the hydraulic pump.
Pi as
Your loader valve also has to be the correct type. Post a couple pictures of it so we can see if its suitable.

Dan

 

[TheOldHokie]

Assuming this parts diagram is correct, there is indeed a union 040 in the discharge line.

First, does your loader's valve have six or seven lines connected to it? Also, maybe a picture or two to confirm it has a pressure relief. Lastly, do you have the return pipe 080, it should be located on the transmission case.
View attachment 143092
If you have all the requisites, you would replace the union with two elbows. Then run a line from line 010 to the P port on your loader valve. Run another line from the power beyond (probably N) on your loader valve to the 050 line. Put male-female disconnects on those two lines so that they can be connected together when the loader is removed. Run a third line from the T port to line 080, this gives you a dump to tank. You'd probably want a quick disconnect on it for convenience, but it can be left closed off when the loader is off.

You beat me to it.

Dan

 

[PoTreeBoy]

You beat me to it.

Dan

Had to get up early this morning .