Backhoe B26 hydralics bypassing

[J_J]

Yes, it could be set 40 psi over.

If the service man had a manual pump, he could pump up the pressure greater than pump pressure, adjust it to 40 psi over the tractor pump, and insure the relief for the valve never activates, or activate a cyl, and when the valve starts to relief, turn the screw some more, about a quarter turn. If it is shimmed , add shims to go beyond the pressure required to activate the valve.

If you have the gage, and you know the pump max psi, then you can adjust all the reliefs on the tractor the same, and be done with it. If you set them at pump pressure, that is the max pressure you will be using, and about the best you can do for the hydraulics.

Have you had the chance to operate another BH, with same pressure to determine if it has similar performance.

You don't need the service man now that you have a gage. You do have to know the pump rated pressure limit.

 

[woody]

JJ, thanks I have no not ran another b26 but I have ran similar BH. and your right I believe I will be making some adjustments myself.

 

[JoelD]

How is this not a warranty matter?

Can't you just google b26 relief presure and find what it should be at?

I'd first have fixed under warranty

Then I'd purchase service manual which answer many of your questions

The last thing I'd be doing is messing with a new machine (essentialy new)

Would hate break something upstream


Joel

 

[woody]

How is this not a warranty matter?

Can't you just google b26 relief presure and find what it should be at?

I'd first have fixed under warranty

Then I'd purchase service manual which answer many of your questions

The last thing I'd be doing is messing with a new machine (essentialy new)

Would hate break something upstream


Joel

Joel you are right but I have been tring to get two local dealers and a Kubota rep to take care of it.

 

[mrennie]

Hi:

The factory manual says to warm the hydraulic oil up to 50 degrees C, run the motor at rated RPM (2800), then attach a pressure gauge to the lower hose on one of the dump cylinders (they show a picture of the gauge connected to the hose that normally goes to the lower fitting on the left side cylinder that controls the bucket rollback/dump).

Once you connect the gauge it says to move the FEL control lever to the DUMP position and measure the pressure. Pressure should be 2290PSI-2400PSI.

If pressure is not within spec, adjust with shims. They list 3 shims thickness, .1MM, .2MM, and .4MM. There is no info saying how much change there is with the different thicknesses.

Hope that helps!!

Michael

 

[woody]

Hi:

The factory manual says to warm the hydraulic oil up to 50 degrees C, run the motor at rated RPM (2800), then attach a pressure gauge to the lower hose on one of the dump cylinders (they show a picture of the gauge connected to the hose that normally goes to the lower fitting on the left side cylinder that controls the bucket rollback/dump).

Once you connect the gauge it says to move the FEL control lever to the DUMP position and measure the pressure. Pressure should be 2290PSI-2400PSI.

If pressure is not within spec, adjust with shims. They list 3 shims thickness, .1MM, .2MM, and .4MM. There is no info saying how much change there is with the different thicknesses.

Hope that helps!!

Michael

Thank you, this is just what I needed I can live with 2400psi but the 2200psi that is right now is not going to get it. I think I need one of those manuals. thanks again to everyone.

 

[woody]

I have been calling Kubota in Georgia, three times in the past week. Today I got a phone call from my local dealer he wants my B26 in his shop Wednesday so the Kubota rep can look at it.

 

[J_J]

Make sure you demonstrate to the rep, what the BH will or will not do. Good luck

 

[J_J]

An increase of 2200 to 2400 psi will increase a 3 in cyl, 1.5 in rod, a cyl push force about 1200 lbs.

 

[JoelD]

Sounds like your are on your way to a solution, looking forward to seeing what the rep has to say.

I hope you get his resolved to your satisfaction.

One things for sure, the guys here sure do make it easy to get the information you need to be able to speak intelligently with the rep and dealer, makes resolution a lot easier to get at.

Those B26's are nice machines.

Joel