Power Beyond vs Series for loader valve?

[winston1]

Possible these threads are Japanese JIS Tapered pipe? They would be 3/8-19 and approx 16.7 mm OD on the female thread. JIS tapered and BSTP (British Standard Tapered Pipe) are interchangable.

The metric 1.5 thread gauge seems to fit the threads right on. 19tpi would equate to about 1.3 metric. Sure not positive but another thing that makes me think it is a straight thread is because it is a short thread, I would guess about 3/8" long. I'm still holding my breath "Akon" will respond this next week. Maybe Neat 1500 will shed more light for me.

 

[oldnslo]

The metric 1.5 thread gauge seems to fit the threads right on. 19tpi would equate to about 1.3 metric. Sure not positive but another thing that makes me think it is a straight thread is because it is a short thread, I would guess about 3/8" long. I'm still holding my breath "Akon" will respond this next week. Maybe Neat 1500 will shed more light for me.

M16 x 1.5 is standard size of metric fitting so it could also be that. Normally these types of fittings would have a flat spotface and or a chamfer on them like an american SAE O-ring port.

best of luck on getting the proper fitting and getting your tractor back in operation.

 

[winston1]

Thanks again for your willingness to shed light. The surface does have a little chamfer or bevel on it. I am in operation but have been convinced I'm just not plumbed correctly. I have had absolutly no problems without the power beyond port but still want to do it correctly if possible without buying a new valve or something.

 

[California]

Ok its all back together.

I plumbed the new loader valve the same way it had been for 30 years, with the valve's Out port in series ahead of the 3 point control.

Everything works properly.



Bonus photo! While I was working, this little guy (juvenile coyote, or fox?) came across the front of my open-front tractor stall. He was following a scent and was unconcerned that I noticed him. By the time I reached the camera he seemed annoyed, and departed - moving toward me a few yards (photo) so he could go around the other side of the house.

 

[Neat 1500]

Here are the photos of my tank return and my loader valve.

 

[J_J]

The pump won't blow.

The special Woodruff key on the pump shaft will shear.
Yanmar designed the mechanical pump connection to shear before destroying the pump or anything driving it.

Do you have any reference for your statement about the shaft key.

I just never knew you could select a woodruff key to shear at a selected torque.

In general, a shear key is supposed to be weaker than the surrounding metal .

Shaft Keys - Types and Their Design

Diagram at the bottom of page will explain how compute the torque required to shear.

 

[winston1]

Here are the photos of my tank return and my loader valve.View attachment 301108View attachment 301109View attachment 301110View attachment 301111View attachment 301112

Thank you neat 1500 for the pictures. I know what I need to do now. Only thing holding me back is identifying and procuring whatever fitting is in that top plug hole. Hoping "Akon" will respond but dubious.

California, I have pretty much destroyed your thread. I should have started a new one so I apologize to you and good to know you are up and going with your new valve. We have the coyotes pretty thick here in East Texas. That one almost looks to young to be out on his own.

 

[California]

Winston, don't worry about distracting my inquiry. We have both received a lot of good advice. This thread has accumulated a lot of information that will be helpful to other owners who research this in the future.

For me, I learned that replacing my loader control in series is 'good enough for the girls I go with' as an old Carpenter buddy used to say. In contrast to this, the 'Best Practices' solution is a separate Tank Return like that Kubota dealer started doing.

Also using series configuration, the 3-point lever must be at Down or Hold (not Lift!) so it isn't making back pressure, any time the loader controls are used. If that were in Lift position then the back pressure from the 3-point may be additive to the pressure allowed by the loader control's relief valve.


And finally, my wife saw the critter picture and is sure that's a fox, not coyote. Anybody know? For comparison here are coyote pictures I posted a year ago and below is one from two weeks ago. I still think from the little guy's behavior following a zig-zag scent on the ground and ignoring me, he was probably a baby tracking where Mommy went.

 

[winston1]

After looking at numerous pictures I may have to agree with your wife. Might be a California grey fox. california foxes grey - Bing Images

 

[California]

After looking at numerous pictures I may have to agree with your wife. Might be a California grey fox. california foxes grey - Bing Images

You nailed it! I sent the photo to a friend who is a wildlife biologist with F&G. Just got this back:

That is an adult gray fox. Remarkably they live in close contact with people because they don't perceive us as threats. Every year I speak to at least a dozen people where foxes have had litters under their porches. Pups are frolicking on their patio furniture and even try to enter the house. My guess is that the fox could be denning in the barn - I would not be surprised to see pups around in the spring.