Backhoe problem

[LD1]

The Tank line coming from the BH does feed the remotes (which this tractor in particular doesn't have) and then feeds the 3 PT. Could possibly cause the issue, although the 3 pt valve on Bransons won't keep applying pressure with the arms fully up like other manufacturers do. Once it gets to position set by the lever, there is no more pressure being applied to it.

I'm also leaning towards one or various stuck load check valves on the BH valve bank.

Most other MFG's dont continue to apply pressure either.

Thats where the feedback rod comes into play....so the tractor actually "knows" when the 3PH is at the top of travel.

I know kubota (and Im sure branson and all the others) caution you to leave the 3PH lever LOWERED, Because a slight mis-adjustment of the feedback (or even just the jarring around of the hoe) could make the 3PH say it needs raised....which will pressure spike the tank ports on the BH valve.....because MFG's use a "BH" loop with two hoses and no PB

 

[2515R Dude]

If you post a few more hydraulic diagrams we may be able to make some more progress...

This is the only hydraulic diagram i have for the BH

Usually the three point system has some isolation from the loader & remotes so we can ignore it when the PB is being used for rear remote pressure and the only other hose is going to the sump But that's not an absolute design rule.
rScotty

The Tank line coming from the BH does feed the remotes (which this tractor in particular doesn't have) and then feeds the 3 PT. Could possibly cause the issue, although the 3 pt valve on Bransons won't keep applying pressure with the arms fully up like other manufacturers do. Once it gets to position set by the lever, there is no more pressure being applied to it.

I'm also leaning towards one or various stuck load check valves on the BH valve bank.

I agree on this one, I highly doubt it is 3pt because i ALWAYS keep the 3pt all the way up and this problem just started

 

[oldnslo]

Need advise,
Yesterday my backhoe started acting up.
If i take the boom all the way to one side and then start turning it back, it goes 1/3 of the way, then stops for a second, then keeps going another 1/3, then hesitates again, then goes all the way to the end.
Pretty much same thing with the boom curl, when i extent it all the way out and start the curl, it stops in the middle, then keeps going. Same with the back movement when i try to extend it.

The oil is on MAX, clean as teardrop, so no problem there.

I called the dealer, he said he had never had such an issue. He also called TYM. They also scratch their heads.

The tractor is 2022 Branson 2515R with only 190 Hours.

Any thoughts?

If you use the stabilizer to purposefully tilt the tractor so hoe would gravity swing one direction and require power in the other does it still fail in both directions?

Load check failing should only affect one function and only if if load pressure is higher than pump
Pressure.

May also help point towards inlet or tank condition causing the problem since one direction would now require pressure to swing up hill while other direction could have tendency to run away

 

[2515R Dude]

Ok, here is today's update:
1. Removed the check valve, took out all internals, leaving virtually a hallow pipe, installed it back - no luck.
2. The dealer came with new connectors, we installed them, - no love ether.
3. Per some suggestions tried to pay with the 3pt. Closed the valve, opened, up position, low, middle - no changes

Now, a couple of observations: when the dealer came, he tried to run it at 2K RPM. then we heard slight changes in the engine behavior at the moments when the hesitations/hiccups occur. Interesting, it does not happen at low RPM. I'd expect the tractor would struggle more at lower or idle RPMs.

Dealer recorded a video and going to send it to Branson/TYM.

I'm starting to think that the problem is in the main control valve because only 2 functions out of four are affected. The Stabilizer and bucket curl do work fine. The only problems are with the boom swing and the dipper stick.

 

[K5lwq]

I was afraid that was the issue. Now of course determining what is wrong with those spools will be the challenge. They may replace the entire valve set or just the individual ones showing the symptoms. We may not ever know what actually is the issue once Warranty kicks in.

 

[rScotty]

Ok, here is today's update:
1. Removed the check valve, took out all internals, leaving virtually a hallow pipe, installed it back - no luck.
2. The dealer came with new connectors, we installed them, - no love ether.
3. Per some suggestions tried to pay with the 3pt. Closed the valve, opened, up position, low, middle - no changes

Now, a couple of observations: when the dealer came, he tried to run it at 2K RPM. then we heard slight changes in the engine behavior at the moments when the hesitations/hiccups occur. Interesting, it does not happen at low RPM. I'd expect the tractor would struggle more at lower or idle RPMs.

Dealer recorded a video and going to send it to Branson/TYM.

I'm starting to think that the problem is in the main control valve because only 2 functions out of four are affected. The Stabilizer an d bucket curl do work fine. The only problems are with the boom swing and the dipper stick.

It sounds like you have an excellent dealer. That's worth some publicity in my opinion. You guys did all that most of us would have done. Not much more can be done without a flow tester. But for some reason very few shops have them. That slight change at 2K is perplexing enough to keep me from even venturing a guess as to what is going on there.

I'm still not completely clear on which functions are affected, and thought at one time it was the boom swing and boom extend, rather than the dipper stick. Is the problem moving around or did I misunderstand?

But it is sounding more and more like you say - a main control valve issue. That's surprising; control valves are usually pretty rugged. It will be interesting to hear what Branson/TYM has to say. Maybe they will come up with something nobody has considered.
rScotty

 

[2515R Dude]

I'm still not completely clear on which functions are affected, and thought at one time it was the boom swing and boom extend, rather than the dipper stick. Is the problem moving around or did I misunderstand?

rScotty

Sorry, my fault, i was not clear. Affected the boom swing and dipper stick when I curl or extend it while the boom almost parallel to the ground, it stops in vertical position then keeps going.
The rest of the BH functions well

 

[mmsb27]

Please keep us updated with this. Interesting thread, sorry you have to deal with this, I hope TYM sorts it out for you.

 

[SnailTraX]

Following

 

[C170]

Sounds like cavitation to me (AIR)