Backhoe problem

[2515R Dude]

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?

 

[K5lwq]

My first question is how is it plumbed? Off of the rear remotes or does it have it’s own dedicated lines?

 

[2515R Dude]

I dont know the difference, it is a line which i make a loop when the backhoe is not connected. It comes from the rear of the gear box. I guess it is a dedicated line but not sure.

 

[ROUSTABOUT]

I dont know the difference, it is a line which i make a loop when the backhoe is not connected. It comes from the rear of the gear box. I guess it is a dedicated line but not sure.

You are plumbed off tractor hydraulics. Ours has a separate pump that goes on PTO. That's what he was asking.

 

[K5lwq]

Okay if you have to use a loop when the backhoe is disconnected then it is plumbed using power beyond line likely from the loader valve.

Do you see the same issue with the loader? If not, I would look closely at the quick connects that feed the backhoe. Disconnect and reconnect each one to make sure a solid connection. Also, is this the first time using the backhoe or is this a new issue and it has worked correctly in the past?

 

[Hoss710]

the big industrial units have shocks built into the cylinders as to not bang on full swing. but I doubt a tractor backhoe would have the same features.

 

[Willman]

My Bradco BH has an in line filter ON the BH, could yours have one and clogged?

 

[rScotty]

Okay if you have to use a loop when the backhoe is disconnected then it is plumbed using power beyond line likely from the loader valve.

Do you see the same issue with the loader? If not, I would look closely at the quick connects that feed the backhoe. Disconnect and reconnect each one to make sure a solid connection. Also, is this the first time using the backhoe or is this a new issue and it has worked correctly in the past?

That would be my guess too. If it worked before, it is something simple in the hydraulic feed. Either the quick connects as you say, or something bumped the rear remote control levers located beside the seat and the levers aren't opening the remote valve fully.

 

[2515R Dude]

Okay if you have to use a loop when the backhoe is disconnected then it is plumbed using power beyond line likely from the loader valve.

Do you see the same issue with the loader? If not, I would look closely at the quick connects that feed the backhoe. Disconnect and reconnect each one to make sure a solid connection. Also, is this the first time using the backhoe or is this a new issue and it has worked correctly in the past?

I attached the picture how the BH connected to the tractor.
I don't see any problem with the loader. it works smooth.
The dealer told me to connect and reconnect the CCs, no love here, same issue. The connection is solid, no leaks.
Also, i don't see any additional filters besides the one for the hydraulics. It was changed 90 hour ago on 100 hours service.
This BH is used for more than 50 hours, and it started acting up yesterday after flowless 1 hour work.
There are some changes today morning, instead of stopping every 1/3 of the way, it starts fast then start jumping 5-7 times while going this half circle.

 

[rScotty]

OK. So it's time to start eliminating things.
BTW, that feed and return to the hoe looks like a homebrew hydraulic extention rather than factory remotes. Is that so? And if so, then the BH probably gets it's feed from the power beyond port - labeled PB - on the loader control valve. And so one of those hoses you have pictured is from the PB port - probably the smaller one to the left - and the other is the return back to the tractor transmission/hydraulic sump.

By the way, are you sure you don't have those hoses reversed? Do the fittings make that impossible?

It's not the hydraulic pump because the loader works well. That's great.
And It probably isn't the power beyond port up on the loader valve because that is just a port and a hose.

An important piece of info is whatever is going on affects all the BH functions. That means it isn't an air bubble in a cylinder or a bad backhoe control valve.

So that leaves either reversed hoses, some blockage on one of the lines, a relief valve n the backhoe control valve gone bad, or the hose connections.

Check the hoses for reversed first. Darn, I wish I was there with my pressure gauge.

Nest gently tap on the pressure relief valve or feel of it to see if it is jumping. The relief valve is usually the longest cylinder jutting out from the control valve block. Sometimes there are several. A relief valve It is just a pressure spring and poppet valve. Sometimes you can hear it operate. In normal operation the pressure relief doesn't do anything. If that valve is cycling as the hesitation happens then that is the problem. It should be quiet.

BTW, does the engine load down when the hesitation happens or does it speed up? Any noises?
rScotty