Backhoe B26 hydralics bypassing

[woody]

Hello newbie here with a story to tell. I purchased a used B26 with 38 hours on it and it is a 2009 model. First time operating it (not my first time on a backhoe) I thought the backhoe was weak, very weak so I babied it until I had 50 hours on it to be sure it was not just me. Carried it in for a fifty hour service and explained to the service guy and his boss what I thought. When I got it back they said there was nothing wrong. So I ran it another ten hours and carried it to a different dealer. After a week he calls and tells me nothing wrong with my b26. while I was on the phone he mentioned the Kubota rep was there and I asked him several times to get the rep to look at it within ten minutes the rep told him that there was something wrong and told him to adjust the bypass valve for the backhoe. I got it back and it is better, but it is still not right. When you reach out with the backhoe and try to get some dirt it does not dig, does not move the machine, and does not pull the motor down. Ok enough of my whining what is your advice?

 

[wdchyd]

Welcome to TBN Slywoody:welcome:

Hopefully this site helps you to success at your problem.....

You'll need to find someone with a flow meter w/ load valve.....takes minutes to hook up and seconds to tell if somethings wrong......

Kubota Flow/Load Meter Test - Tractor Videos - Kubota, John Deere, New Holland and More

Here's a test run on my new B2320 with flow meter installed in place of backhoe.....could of been just as easily installed upstream or down stream of BH......Had the BH been installed while doing this test, digging and movement of the machine would be possible to verify good or bad results.....

At least you won't be guessing at pressures and flows, you'll see it in real time......one of the problems with hydraulics is you cannot see pressure and flow internally in hoses and cylinders without guages and test equipment...similar to electrical troubles where voltmeter and amprobe is needed.......

Find someone that has more than just a pressure guage, it'll save you alot of aggravation....:thumbsup:...Then you can fix it or live with it

 

[kennyd]

Find someone that has more than just a pressure guage, it'll save you alot of aggravation....:thumbsup:...Then you can fix it or live with it

I think a simple pressure gauge will help a lot here...and they are cheap ($30) compared to a flow gauge. He can check the PRV (pressure relief valve) with it-and that is what seems like could be set improperly.

 

[woody]

where do I get a pressure guage set up for the Kubota?

 

[kennyd]

where do I get a pressure guage set up for the Kubota?

You can buy 0-3000 PSI gauges at TSC (Tractor Supply) or at the Surplus Center online. You will then need to determine the type and size of the ports that go to the cylinders.

 

[wdchyd]

I think a simple pressure gauge will help a lot here...and they are cheap ($30) compared to a flow gauge. He can check the PRV (pressure relief valve) with it-and that is what seems like could be set improperly.

Very true, but didn't the OP did say that he brought it to two different dealers(one had it for a week)....can't imagine at least one didn't use a pressure guage....

Didn't Akkaman's threads hammer home it needs Pressure and flow to do work???

I've seen lot's of times the hyd pump was right on the edge of NG (according to the guage it's OK) and the pump flow quits at rated pressure.....going into a stall while trying to do work......

Yes it's cheaper but life isn't always cheap to troubleshoot....

If the dealer cannot tell the OP what pressure/flow is putting out, then find another place to bring it......:2cents:

 

[MarkV]

Woody, welcome to the forum. I would think a tractor bought with 38 hours would still be covered by warranty. What were the details of your purchase? That is an unusually low number of hours for a used tractor from a private owner.

I think the guys that recommend a pressure gauge are right. At least then you can verify if the relief valves are set to spec's or the tractor just isn't what you expected. It doesn't sound like you have had enough hours on the tractor with the proper settings to know what it should do yet.

MarkV

 

[J_J]

Have you rechecked all the QD's and is there a return hose to tank from the BH?
There should be no back pressure on that line. Does your FEL work OK. Where is the fluid coming from gong to the BH? Otherwise the routing of the hyd flow. Are the hoses to the BH connected correctly?

Stay on your dealer about the situation, and make him show you how it is working good.

 

[woody]

Mark, the previous owner passed away and I bought it from his wife. I did carry it to two dealers. I also own a Lay-Mor backhoe with a 25 hp Kohlar on it that I have had for about ten years I thought the Kubota should out do the lay-mor but it does not, well at least the backhoe does not. where is the bypass located at on the B26?

 

[woody]

ok after tring out the tractor it still does not perform correctly, called the service man last week and he told me he would get with the rep. I had to go right by the shop today so I stopped in. the service manager could not tell me what my pressures were or at what pressure they bypass all he would say is that they adjusted them to 40PSI above max. I ask had he called the rep and he had not. is this adjustment done by shims or is it an adjustment.