Difference between these valves?

[kennyd]

(Canoetrpr, hope you don't mind if I borrow your thread a bit.)

I too want to add some extra spools, but in my case I'm planning to tie into the PB line my tractor uses for the backhoe.

Using a picture I stole from the site Kenny posted, can anybody tell me if my plumming plan is correct.

Using a valve like the lower valve #1, the plan is lines A and B would tie into my existing PB lines on the tractor.

Then I would also need a third line (C) tied into some yet unknown return port on the tractor.

Sound good so far ?. The cylinder lines are pretty easy to figure out.

Will, you really should start your own thread

 

[herringchoker]

Canoetrpr - Princess Auto has a PB adaptor for the BM40 series valves. It lists at $21.99 in the current catalogue. The 3 spool valve lists at $349.99. When I did mine 3 years ago, I gathered parts ahead so I could get the valve on sale (if memory serves I paid $169 for the 2 spooler, which lists now for $249). I've never seen valve accessories such as the PB adaptor on sale. (Yes, mine has PB.)
I like the idea of the Prince SV valves, and if I were doing it again, I would take a hard look at them.

 

[canoetrpr]

herringchoker:

Did you get your hoses, fittings from Princess Auto?

The SV valves do look good. From reading some stuff on the Prince site, I ought to get a torque wrench to put it together. Kinda odd that they don't sell smaller monoblock valves rated for a lower GPM.

 

[herringchoker]

Yes, I did get the hoses and fittings from Princess Auto. I'm only about 4 miles from their local store and they're open longer hours than the local hydraulic shops, so I find them very convenient.
What I like about the BM40 valve is the compact size (besides the sale price ). I was installing the remotes as part of a cab building project and space was at a premium.

 

[hill]

Yes, I did get the hoses and fittings from Princess Auto. I'm only about 4 miles from their local store and they're open longer hours than the local hydraulic shops, so I find them very convenient.
What I like about the BM40 valve is the compact size (besides the sale price ). I was installing the remotes as part of a cab building project and space was at a premium.

It sure would be a convenient circumstance to have any hydraulic line shop close by = I'll be having to make 25 mile trips to and fro in order to adjust my miscalculations when I get started with this hydraulic bugaboo.

My tractor is also a B7800 with Kubota's backhoe so I imagine that the two QD lines that operate it are much the same as you have. I intend to use those lines to power T&T when the hoe is not installed, and want to add a thumb for the hoe using a single new valve plumbed in front of the existing hoe valve to operate that. I'd been hoping to find a valve small enough to fit into the BH control tower with it's operating handle extended through the existing top cover of that control tower but find it is difficult fit. Prince valves are the smallest available that could be used?

Can you verify for me that the only available source on these machines is the PB circuit from the loader valve which supplies the backhoe by fairly long hoses? I haven't come to the point of pulling panels from the tractor to see if there's another way to access hydraulic flow hidden somewhere in the depths of the machine.

 

[herringchoker]

hill - Yes, I'm fortunate in having Princess Auto 4 miles away and a professional hydraulics service shop only 2 miles away.

I'm not familiar with the Prince valves, but the BM40 valves sold by Princess Auto were the smallest I could find in this GPM range at that time. Sorry, I can't help much on that one.

According to my operator's manual (which covers the B2710/B2910/B7800), the loader outlet (they call it the Mid outlet) is the only auxiliary hydraulic block on the B7800. (The manual says the B2710 and B2910 have an additional rear hydraulic block, but that's no help to us. ) As you say, you would have to power your additional hydraulics from that tap, i.e. power beyond from the loader valve.

 

[canoetrpr]

hill - I figured that most backhoes would have their own hydraulic pump driven by the PTO. Is this not the case on your B7800?

 

[MJPetersen]

Actually, small hoes, even commercially produced ones like the new Woods BH70x, have fairly modest flow requirements of 4-6 gpm (the BH80x is 5-7gpm). This can usually most economically be handled by the hydraulics on the tractor rather than adding the complexity of a tank, pump, filters and hoses. On open center systems this involves using a pb port and when the hoe is not connected the QD's need to be connected with a hose to allow through flow.

Mike

 

[canoetrpr]

MJPeterson:

Very interesting.

If I want to go down the path of adding a 3 spool remove valve on my L3400 Kubota, using the PB port on the loader, what should I be keeping in mind to allow my hydraulic system to be compatible with a Woods BH-80X for example?

Not that I can really justify a hoe given about 50 hrs of use per year but I have though about it instead of an upgrade to a Grand L - neither of which I "need" BTW.... but both of which would be fun and would cost about the same ;-)

I imagine that if I did ever get a hoe, the Woods BH-80X would be on TOP of my list. I'm incredibly impressed with their rotary cutter I have now and even more impressed with their customer service.

 

[MJPetersen]

If I want to go down the path of adding a 3 spool remove valve on my L3400 Kubota, using the PB port on the loader, what should I be keeping in mind to allow my hydraulic system to be compatible with a Woods BH-80X for example?

The only thing that is important is that you will not power your bh with the valves that control your remotes. You will have to add an additional pb remote, tying into the circuit either before your new valves or after through the pb of the new valves. This pb remote must be connected together if the bh is not installed to allow the oil to flow in its cycle.

I confess I really like the looks of the 70X and 80X series hoes. They just look really sweet.

Mike