Bump up lift capacity of L3400/LA463 Loader

[Tomtint]

,

This is NOT correct at all... See ritschner post number 203 above to see why. It depends on how many shims were put in when the tractor was assembled (?). Not sure who puts them in. I was able to tighten and get 150 extra psi.

As for just blindly turning the nut without knowing the psi... you have to ask yourself, are you willing to gamble with buying a new pump???

Anyone willing to bump theirs up to 3000 to see how long it lasts??? I'm thinking of bumping it up to 2700, too

Let me know how you make out with 2700....

 

[rswyan]

What you say is true, but.

Curious why you did not install the gage in the IN port.

With gage installed in the IN port, it will indicate any pressure develops by your hyd. FEL, remotes, 3pt.

That is what I did with the gauge I just installed ...

 

[teg]

That is what I did with the gauge I just installed ...

Photo??? Please...

 

[J_J]

Originally Posted by teg View Post
This is NOT correct at all... See ritschner post number 203 above to see why. It depends on how many shims were put in when the tractor was assembled (?). Not sure who puts them in. I was able to tighten and get 150 extra psi.

As for just blindly turning the nut without knowing the psi... you have to ask yourself, are you willing to gamble with buying a new pump???

Anyone willing to bump theirs up to 3000 to see how long it lasts??? I'm thinking of bumping it up to 2700, too



Yes, my data is correct.

I read that post and it did not make sense at all.

That is a lock down nut on that type relief valve, once tighten, you don't mess with it. You should know that.

Looking at the PDF for that tractor, that is a shim type relief valve and you don't turn any nut to adjust.

With shims, you install the shim you want and lock the cap down and then recheck the pressure.

You definitely do not do both, adjust a nut and install shims.

I looked at your tractor PDF, and it uses shims and no adjustment nut there.

Again, it is a lock down nut that is fully tighten with no other adjustment.

I suggest you go to Messnicks.com, select Kubota and enter your tractor data and look at the PDF.

 

[Turbys_1700]

Originally Posted by teg View Post
This is NOT correct at all... See ritschner post number 203 above to see why. It depends on how many shims were put in when the tractor was assembled (?). Not sure who puts them in. I was able to tighten and get 150 extra psi.

As for just blindly turning the nut without knowing the psi... you have to ask yourself, are you willing to gamble with buying a new pump???

Anyone willing to bump theirs up to 3000 to see how long it lasts??? I'm thinking of bumping it up to 2700, too



Yes, my data is correct.

I read that post and it did not make sense at all.

That is a lock down nut on that type relief valve, once tighten, you don't mess with it. You should know that.

Looking at the PDF for that tractor, that is a shim type relief valve and you don't turn any nut to adjust.

With shims, you install the shim you want and lock the cap down and then recheck the pressure.

You definitely do not do both, adjust a nut and install shims.

I looked at your tractor PDF, and it uses shims and no adjustment nut there.

Again, it is a lock down nut that is fully tighten with no other adjustment.

I suggest you go to Messnicks.com, select Kubota and enter your tractor data and look at the PDF.

J_J...
You certainly are an expert on increasing psi to increase the lifting capacity of your FEL...
Do you have a chart or have you calculated how much lift increase you get with increased pressures?
I am just wondering...
Thank you for your input on this subject...
I appreciate it...

 

[J_J]

You can figure the push force to a straight on push, and you can figure the push force at an angle, but then you have the mechanical dimensions of the bucket mounting pins to length of the bucket.

Straight on push force for one cyl.

For instance , a 2 in cyl bore and 1 in shaft.

2500 psi

Push Force = 7854 lbs
Pull Force = 5890 lbs

2700 psi

Push force = 8482 lbs
Pull force = 6362 lbs

628 lbs difference for each cyl

Pushing at an angle will be less.

Double that increase for two cyl

 

[J_J]

Lock down, meaning you tighten good the first time and leave it alone.

It is definitely not an adjustable hex plug.

The shims is what sets the pressure.

Each cyl

2 in bore, 1 in shaft

1 psi = 3.14 lbs straight push

50 psi= 157 lbs straight push

100 psi = 314 lbs straight push

 

[rswyan]

Photo??? Please...

teg,

Sorry - didn't notice this until just now - I'll get you one tomorrow once it's light out.

(FWIW, the location worked out perfectly - I can see it easily just under the loader's cross bar from the seat )

 

[ritschner]

J_J, you are correct in that the valve should be bottomed, tightened to 47 ft-lbs, and shimmed properly to achieve the correct pressure, but not everything is always done correctly. Mine technically should have been done that way but was not. When I did tighten mine with the original installed shims, I ended up with 3000psi. I had to remove two of the originally installed shims just to lower it to 2700psi(see post#112 for more details). I am under the impression that some of the dealers doing the assembly have found out they can do it quick and easy by just add extra shims and only install the relief valve in far enough to achieve desired pressure and depend on the o-ring on the relief valve to tension the valve and prevent leaks. That is why I posted the FYI. I would hate to see some unfortunate owner check the pressure, be a hundred pounds under spec, add a couple of shims, bottom the relief valve, and end up over pressuring the system and damaging components or injuring themselves. There is another recent poster, Teg I believe, that also was able to tighten his relief valve and gain 150psi. On another note, I have been running my pressure at 2700psi since august of 2009 with no issues.

 

[teg]

teg, Sorry - didn't notice this until just now...

No problem, I did see you have a B2910 so it might not work for the L xx00 models but always good to see photos

...There is another recent poster, Teg I believe, that also was able to tighten his relief valve and gain 150psi...

you bet, and think I can tighten it a bit more!