Different 3rd function kits, options and components were considered before purchasing the Summit kit specific for the B2650/B3350. I was interested in Everything Attachments grapple so I started my search there. They use the WR Long valve and I was referred to Josh (at WR Long) for some answers to my questions. Unable to answer any specific questions about the B2650 system, Josh was adamant that the 3rd function valve was to be installed directly after the loader valve's power beyond port and before any backhoe or other hydraulic attachments. I understood it to be because of potential back pressures and possible seal blowout. I'm still not sure if that made sense or not. But that kit was higher priced than others and maybe not Kubota B2650 specific with the backhoe attachment.
Summit Hydraulics offers kits made for the B2650/3350, a more universal kit, and some that only include the valve, controls and a few fittings (you supply mounts, hoses, etc.). One difference between the valves is in how they can be plumbed into your tractor's hydraulics. When I spoke with Patrick and asked about my situation (with a backhoe) he said either type would work. Their B2650 kit was model specific, the others not. The B2650 kit's valve block would be a cleaner install with the hose layout. The universal kit could be plumbed a little differently with a backhoe option on the tractor. Questioned again about the difference in plumbing, Patrick said either would work for me.
Here's the install diagrams for the two different valves (found on their website):
View attachment 42206
This B2650 kit is plumbed in like this first diagram with the Valve T port going to the backhoe input and the backhoe return line feeding the 3 pt hitch and then to hydraulic (tank) reservoir.
View attachment 42207
Notice the use of the optional N Port to feed the backhoe or a different hydraulic attachment with this universal valve.
In the end, Summit's B2650 3rd Function Kit (TFK7) was ordered. Here's some specs
from their website listed for that model: Valve Body Features Max Operating Pressures: (Ports) P=5080 PSI T=3050 PSI A&B=5080 PSI 3000 PSI RATED
Here's that speedbump: After the install and getting pictures ready for this thread, I noticed this picture of the valve's data plate. Do you notice what I did? Pay attention to the port max pressure ratings.
View attachment 42208
Oh CRAP! I called and spoke with Patrick again and told him of the discrepancy between their website and the data plate info. Strange, he said, that data plate must have a misprint. (I didn't find that very plausible). Asked if their valve was going to cause me trouble in my situation, Patrick assured me it was not. He said a large number of them have been installed with backhoes and none had problems. I was not to worry. What to do??? Since Summit says not to worry, I'll go with it as is and see what happens.
If you haven't spotted the discrepancy yet, compare the Max T Port pressure rating listed on their website (see above) versus the T port rating on the valve data plate. (data plate: T=1450 PSI) That's quite a difference. And much less than the B2650 max hydraulic pressure. Maybe there's such a safety factor built in that in this case it doesn't matter? But their website disagrees with their product's stated pressure rating. And nowhere on their website does it say that this kit is not to be used when a backhoe is installed.
The WR Long FAQs state to install their valve exactly the same as this Summit valve. See question #6 (the 2nd #5
)
https://www.wrlonginc.com/help
And even more strange, Messick's Land Pride instructions:
https://www.messicks.com/part/380-168a/b2650-b3350-third-function-valve-kit
(see install Instructions pdf) are exactly the same as Summit's except for the brand name on the instruction sheet. Even the pics in both are the same photo copied pics and almost verbatim instructions to follow.
Summit gladly emailed me pdf copies of their install instructions prior to the purchase.
I couldn't find a pdf of the WR Long instructions to see if they were identical. Chances are they could be, too.
In the end, maybe all is well. The Summit kit was easy to install, complete, and even worked when installed with a backhoe attachment. They could've included a couple LARGE tie wraps to secure the hoses on the loader arm itself but I like my homemade clamp better anyway. No biggie!
All the 3rd function systems that I could find for my situation on the compact tractor apparently use the same style with the simpler plumbing. Do the D03 subplate type valves have T ports rated for full tractor hydraulic pressures? Perhaps the hydraulic gurus reading this can comment on and explain the T port discrepancy and the reason for the two different valve styles???
The grapple arrives shortly but it might be a while til things dry up enough to use it. Until then, fingers crossed.
