Top and Tilt Hydraulic How to: Kubota Review  -- Kubota Tractors Discussion Forum and Review Top and Tilt Hydraulic How to: Kubota Review -- Kubota Tractors Discussion Forum

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 12-06-2004, 19:48 Post: 101727
zr1john



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Hey Beagle,
On your B7800 where did you pick up the hydraulic for the TNT. Is there a power beyond port on the loader valve? Is there a place you can get pressure on the back of the tractor anywhere? I have ordered a TNT kit from Integration Engineering and need a place to get pressure from. The dealer wanted over $600.00 for rear hydraulic outlet with valve. I just picked up my new 7800 last Monday. I have the 4 way with the regeneration circuit on my FEL. Have got my front and rear light instaled along with a horn. I also installed a diverter valve off the bucket cylinders to operate the cylinder on my rear blade. I need to figure out how to get some pictures up and will make them availiable. This is my second Kubota compact tractor. I still have the Kubota B1750 I bought new in 1990.
Thanks for any info.
John






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 12-06-2004, 20:55 Post: 101730
beagle

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The FEL has a Popwer beyond port. That is how the FEL is installed on the tractor. The front hydraulic block has a PB port and return port. The valve exhaust goes directly back to the tractor reservoir.

My Aux valve is plumbed off the PB port of the FEL. The PB port on the FEL valve routes to the IN port on the Aux valve. The PB port on the AUX valve routes to the return port on the hydraulic block. The OUT port on the AUX valve is "teed" to the return line from the FEL valve. You must have Power Beyond capability on the auxiliary valve to be able to keep the tractor hydraulic circuit complete.

The 7800 does not have a rear hydraulic block like the 2710 and 2910 do. You can add the auxiliary circuit as I descibed off the FEL valve, or off the front hydraulic block if you don't have the FEL. In either case, it needs to be a complete Power Beyond circuit to not interrupt the tractor hydraulics.

I chose to mount the Aux valve on the loader tower because it made the tie-ins to the FEL valve simple. All the hoses are behind the tower. See my pics 2 and 4. Make sure your valve is open center and has Power Beyond capabilites. You should also size the valve slightly larger than the hydraulic capacity of the tractor. There is some flow loss through the valve, and since all the valves are is series, you want to allow for a little extra flow to make up for the losses. My Aux Valve is rated at 12gpm. I haven't noticed any difference in the tractor hydraulics since I installed it. The hook up was pretty straight forward.






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 12-06-2004, 21:13 Post: 101733
zr1john



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Thanks Beagle, I bought the whole kit for the TNT from Integration Engineering. It should arrive before the end of this week. I will post my thoughts on the kit after I get it installed in case anyone may be interested. Thanks again,
John
P.S. Saw the pic of your dogs. My little beagle will by 14 years old next month. Best Dog I ever had!






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 12-06-2004, 21:30 Post: 101734
beagle

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john, curious about what you paid for the IE kit. I spent about $250 for the Aux valve, hoses, fittings, and plugs, and about another $150 for the cylinders, plus some fabrication time to make the end clevis's for the cylinders and the mounts for the valve and plugs. About right?






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 12-06-2004, 21:56 Post: 101735
zr1john



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The complete kit from integrated engineering is $1200.00 and includes everything. There were some forums that I read on the other tractor site which I cannot post it's name here, where some people had this system and really liked it. The kit includes hoses, joystick valve and console,ROPS mounting arm system, cylinders with check valves and position indicators. This may be more than some of the other store bought systems but it seems to be the Cadillac of the ones I researched. check out their website "topandtilt"
John






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 12-07-2004, 09:40 Post: 101757
beagle

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I had looked at their system when I was putting together mine. I never did price it, nice set up, alittle pricey.






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 12-09-2004, 19:51 Post: 102002
zr1john



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Hello Beagle,
Can you tell me exactly where the power beyond port is located on the loader valve. I can only find one small port located on the right side of the loader valve when you are sitting on the tractor. It is a small plug that looks to be about the size of a quarter inch pipe plug.
An interesting note, I emailed the Kubota tech center and asked them if the valve on my loader had a power beyond port. They responded back to me that my loader valve does not have a power beyond port.
Anyone else out there have rear hydraulics connected to a power beyond port on their loader valve? I have a B7800 with the LA402 loader with the 4 position valve with the regent circuit.
Thanks,
John






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 12-10-2004, 07:39 Post: 102032
beagle

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Your FEL has power beyond, that is how it runs off the tractor hydraulics. The power beyond port on the FEL is presently routed to the return port on the tactor hydraulic block. If you look in the owners manual for the loader, in the set up section, the PB port on the valve and the return port on the hydraulic block are both identified. They are color coded, I don't remember the color at this time.

Understanding the circuit makes identifying the ports easier. You are NOT looking for a port that is not presently used. The PB port is used to complete the cicuit. The FEL valve is actually in series with the tractor hydraulics. The additional Aux. Valve will be the second valve in a series of PB circuits running off the tractor circuit. Power beyond allows fluid pressure beyond the first valve. Don't confuse Power Beyond with exhaust. To have a series circuit, you need three ports on the valve: "in", "power beyond", and "out". The "out" is exhaust oil and is always routed directly to the reservoir. The "in" is pressure fluid in, coming from the pump or the power beyond port of another valve. The "power beyond" port supplies pressure flow beyond the valve, to the next section of the circuit. The last valve in a series
would not require power beyond since there isn't anything down the circuit that requires pressure flow.

If you look at your FEL valve, you will see three lines attached to the valve, besides the 4 work ports. Match these three lines up with the diagram in the manual. My valve was also marked in the casting with port identifiers; "in", "out", and "PB", along with the color coding.

Hope all this helps. It's pretty straight forward once you see how the circuits are run.






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 12-10-2004, 07:59 Post: 102033
beagle

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All of that, and what I didn't say is, to hook up the Aux Valve, you will disconnect the hose that presently runs from the "PB" port on the FEL valve to the return port on the hydraulic block and hook it to the "in" port on your Aux. Valve. The "PB" port on the Aux Valve will then be hooked to the return port on the hydraulic block. The "out" on the Aux valve will be "teed" to the "out" of the FEL valve that runs to the tractor reservoir.






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 12-10-2004, 09:16 Post: 102041
zr1john



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Beagle,

Make much more sense now. I did as you said and looked at the loader book and I also looked at the dealer set up and assembly pamplet. I was looking for an unused port. You have been a great help, Thank you! I'll let you know how it works out
John






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

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