Loader plumbing

[Car Doc]

Just for further conversation on some differences in our machines and for posterity. I am posting pics of my 3pt block and like I said these ports may be the correct way to plumb an auxiliary attachment?

It may have the return built in the block to dump into the trans case I have no idea so anybody have an idea please feel free to say it.

My tractor and kenmacs and Domush's are almost identical in so many ways as far as what I know. They may all have the same 3pt block as me no idea about that either.

Also I am familiar with exactly how kenmac has his plumbed and his performance improved once he did it like he said in the other post (and where I stuck my nose in ) but thats his info he earned it and will share if and when he wants to.

 

[winston1]

I really haven't considered it a problem but my loader has a hesitation on the curl feature. Not every curl, just every once in a while. Without a pb port is there any other way to plumb that might do away with the hesitation. Might add I don't think I ever actuate loader and 3 point at the same time.

 

[Smoody]

Now that it has been mentioned, i get the curl hesitation sometimes to.

 

[California]

... some differences in our machines ... I am posting pics of my 3pt block...

It may have the return built in the block to dump into the trans case I have no idea so anybody have an idea please feel free to say it.

I think you have the updated, direct-coupled divider that superceded the external divider block. Same function, different appearance.

Note in this diagram the output from the divider block goes to the input of the 3-point lift.

 

[J_J]

The main objective with adding additional valves, or a set of QD's for remote operation, is that the flow in open center circuits should be in series.

A simple circuit with no PB on FEL, would be pump, FEL, 3pt, tank.

Another circuit, with PB on FEL. pump, FEL, PB out to 3pt, or another valve with PB.

You could also run a set of QD to the back for a log splitter, pump, FEL, hose from PB to back QD, another hose with QD to 3pt.

If the QD at the back are not being used, then a short jumper for the two QD is necessary.

When you want to use a log splitter, unplug the short hose and plug in the log splitter hoses. The log splitter valve will pass the fluid to the 3pt and then tank.

Most return hoses should go to tank. Below is the exception.

If your FEL valve does not have PB, then the return/tank hose will go to the 3pt.

When the 3pt valve is being used, all valves and hoses up stream are pressurized.

 

[California]

If your FEL valve does not have PB, then the return/tank hose will go to the 3pt.

When the 3pt valve is being used, all valves and hoses up stream are pressurized.

Thanks! That brings into focus why we get weird interactions. I have bumped orchard limbs, looking back and raising the (heavy) backhoe for transport ... while the loader raised by itself. This loader's valves don't spring back to center reliably when they are pressurized like that.

 

[kenmac]

According to Koyker , a few years ago they supplied a 2 handle valve for the loaders & everything worked well plumbed like most yanmars are. When they changed to the single joy stick with PB ,They say that the PBY should be plumbed to the 3 PT & outlet return to the sump

 

[JCByrd24]

A couple points of clarity:

1) As JJ says, with any valve added in series between the pump and the 3ph valve, when the 3ph is used to lift something, the entire system is pressurized. In the Hoye diagram, this includes the outlet side of the valve added. The big issue here is that most valves are not designed to have this pressure on the outlet side, 500 psi is a typical max oulet or tank, some are more like 100psi. So, if your system will lift your 3ph load with only that psi, it'll work fine. Probably there is a little safety factor there too, so it could work OK for quite some time, but when you lift that heavy load that drives system pressure to 1500psi or more, the valve could burst or more likely seals will let go first.

2) Power beyond acts just like the outlet (as plumbed per Hoye), except it is designed to pass the HP. In addition, you get an extra return to sump, so you can lower your loader and raise you 3ph at the same time , or lower and dump at the same time, see below.

3) PBYD does necessarily give you loader and 3ph control simultaneously. If you full stroke the loader valve, you will have no flow at the 3ph valve. If you partially stroke it, you will have some flow available, but the fluid will take the path of least resistance and will likely work one of them over the other. Similarly, the if you stroke the loader for both lift and curl fully, the one with the least resistance will get the priority. If you had enough pump capacity, both may work...

 

[Smoody]

I have the 2 handle valve on my allied 195 loader, so I assume by kenmacs info that its plumbed properly, I'f I change to a single control valve guess I will worry with changing it then. This is a very good thread and I don't recall any old threads with this info which is kinda odd with all the information available here.

Can the outlet side of the valve be made to support the higher pressure? Or is that psi rating an internal thing?

 

[Car Doc]

I think you must be right that the grey's don't have it (diverter block), otherwise you'd think hoye would use it. Hoye actually sells fittings to bolt to the pump discharge and hp line so you don't have to cut either.
Yanmar Tractor Parts: HYDRAULIC ADAPTER - ADD A LOADER / LOG SPLITTER
Whatever the method of tapping the high pressure, pbyd valves should be used for the loader AND any additional after that (grapple, TNT).

See I like that better than my situation where they hacked my line up BUT then the outlet would have been an issue they would have had to deal with and obviously the in series is the easy way out for some.

With that said there isn't an adapter that I found would fit on the sump suction flange at the bottom of the trany it is a 4 bolt arrangement.

I am in the pre-plumbing design stage of re-doing mine and have looked into the Hoye HP adapter and if I could have an adapter at the sump/suction line at the bottom of the trany case I would re-attatch my HP line back together with a sleeve and silver solder and do it all that way.

It would be so much more sanitary and simple its not funny.