L3800 HST Rear Remote Hydraulics

[DeltaBravo]

Hi All! My name is Dave and after lurking on this site for a few days and researching all I can find on the topic of adding rear remotes to a Kubota L series tractor, I still have a few questions for the experts. I'm planning on adding a 2 spool valve with one spool float capable. The valve that I have decided on is the Price MB21GB5C1. What I have learned so far, is that I will supply the new valve from the power beyond line coming from the FEL valve and route a return line from the power beyond port of the new valve back to the manifold port where the loader valve PB line was previously attached to. Correct? I will plug the two other outlet ports on the new valve. Here is a list of my other questions:

1) I do not understand how the float works. By putting the float spool valve in detent, does this allow the 3 point to float when using, for example, a box blade?

2)After the installation is complete, there will be air in the new lines. Is there a vent in the hydraulic system? I will need to add more hydraulic fluid to compensate for pressurizing the new valve/lines?

3)The pump capacity on my tractor (L3800 HST) is 6.3 gpm. The new valve that I will be adding is rated at 8 gpm. Is this ok?

I have not purchased the valve yet. I want to make sure that I have a clear understanding of how all of this works before I put my tractor out of service to begin this project. I priced the kit from my Kubota dealer for just a single spool valve and it was $1000. It seems that I should be able to purchase the valve, lines, and fittings for around $500 and install them myself. Any and all info or advice you can provide is very appreciated! Thanks and have a great day.

 

[CDN Farm Boy]

Hi Dave, welcome to the site.

I added a 4 spool to my B3300, the process should be the same for your L. There are a couple things with your understanding that are not accurate -- unless there is something funky with the way the factory did it. You are certainly right about the price of the Kubota kit. I did my 4 spool for about $600. Here's a couple pics of mine http://www.tractorbynet.com/forums/customization/290254-4-spool-rear-remote-install.html?highlight=, I recommend adding as many spools as you have room for. There is no such thing as too many sets of remotes.

Existing setup should be like this:
PB from the loader valve feeds the IN of the 3pt hitch
RETURN of the 3pt hitch goes back to the tank.

The way you want to install the new valve should be like this:
PB from the loader valve to the IN of the new valve
RETURN of the new valve 'T' into the RETURN line of the 3pt hitch (I did mine by changing the fittings right at the tank as per the Kubota manual)
PB of the new valve to the IN of the 3pt hitch.
The 2 pair of work ports of the new valve will have QDs for your attachments
The 3pt will function exactly as it does now.
With a 2 spool valve, you should be using 7 ports total to have it correctly installed.

 

[DeltaBravo]

Thanks for the reply and the pics, CDN. Your install looks great! Sounds like I need to locate the return line from the 3pt to the tank and install a T to accommodate a RETURN from the new valve. Then run a line between the PB port of the new valve to the manifold block on the right side to supply the 3pt. I understand. After my install is complete and I fire up the tractor the first time, I should check the level of the hydraulic fluid and will need to add more? Thank you for your input!

 

[CDN Farm Boy]

Sounds like you have the idea now. Yup, check for leaks and the level. Not likely that the level will change much as you are only filling a few feet of hose and the new valve but always good to check. I don't think mine went down more than 1/2 liter. Whenever you hook up a brand new or new-to-you implement, you should also check the hyd level. It's typically the long hoses and cyl of the implements that make the level go down the first time they are filled.

 

[s219]

The L3800 3-pt does not have an external return line to the tank -- that is all internal to the case. I think you could likely tee into the return line for the front loader though.

The L3800 does have a return port built into the side of the transmission case (it's where the factory valves would bolt on). That might be a good option. You'd need to make some sort of fitting block with an o-ring seal to bolt over the port. If I recall right, the cover blank is a rounded triangular shape with three bolts. It's on the right side of the tractor roughly near the 3-pt lever area, down below on the case.

 

[MtnViewRanch]

Here is a diagram

 

[DeltaBravo]

THANK YOU!!! That diagram clears it up!

 

[RedTailHawk]

What are your thoughts on rear remote hydraulics from Fitritehydraulics.com? I'm talking to them about a 3 spool valve system, 2 with the float function intended to be used with the top & tilt set and the 3rd a spring return to center valve, typically used for implement hydraulics. Anyone have experience with their products? Where do people typically install the valve mount?

 

[Baby Grand]

What are your thoughts on rear remote hydraulics from Fitritehydraulics.com? I'm talking to them about a 3 spool valve system, 2 with the float function intended to be used with the top & tilt set and the 3rd a spring return to center valve, typically used for implement hydraulics. Anyone have experience with their products? Where do people typically install the valve mount?

I don't have Brian's remotes, but I suspect they are first rate.
This is based on the TnT kit that he supplied for my tractor.
He does quality work, is easy to communicate with and stands behind what he sells.
I am very pleased with the gear that he supplied for me.
It really transformed my L into a much more efficient and versatile machine.
-Jim

 

[MtnViewRanch]

What are your thoughts on rear remote hydraulics from Fitritehydraulics.com? I'm talking to them about a 3 spool valve system, 2 with the float function intended to be used with the top & tilt set and the 3rd a spring return to center valve, typically used for implement hydraulics. Anyone have experience with their products? Where do people typically install the valve mount?

Off the ROPS above the fender. Until the last few years, even Kubota mounted the valves there on the std L models.

Something similar to the picture.