Hmm, L3940 acting weird ALREADY

[bitseeker]

Hi,

I think it is working properly, and that's what the manual says it should do.

"The first dump position by moving the lever to the right features greater speed for dumping. The second dump position (to further right) is the "Regular" dump position."

That configuration seems illogical, but it is probably what will work within the valve.

 

[beppington]

SOLVED finally. Turns out the 3PH's upper-end stop at the top needs adjustment.

When I pull my 3PH lever all the way back, the hydraulics continue trying to lift it even though it can't go any further. This is not only enough to slow the loader's up/ down action waaay down, it also affects the HST, i.e. the speed of the tractor! (It had not done this before, though)

I was making the 20-minute tractor drive to my property today & the tractor "seemed" to be bogging down, even though the speedometer read the normal 13-14 mph. I wasn't positive, but it just didn't feel right. I stopped & just tried to think, what could be wrong?? Anything? Nothing obvious, to me anyway. Tried different HST modes, tried some levers, but nothing worked. I decided it was all in my head & kept going. Then ... it started overheating. :shocked: What the heck?!?!?! OK, now the problem went from a little bothersome to serious as all get out. Pulled over & randomly tried all the levers this time. Remember before when curling and/ or un-curling the bucket would fix the slow loader? Not this time! Turns out, as soon as I dropped the 3PH just a hair, the engine pepped right up & all was good again.

The adjustment must've actually gotten more out of adjustment, as now I can lift the 3PH to the top & immediately hear the engine bog; It didn't do that before. That also causes the FEL to immediately operate slowly. It all makes sense now, but it was too subtle in the beginning ... I never heard any engine bog when it first started this little problem.

Something so simple ...

 

[irvingj]

Glad you got it figured out, good job!:thumbsup:

I've had similar situations with my GC when lifting the MMM (same as 3PH); I get a warning, however, when the stop is reached- a higher-pitched whiny noise, indicating hydraulics have reached the end of their travel.

Sort of like a parking-lot power steering situation when somebody cranks on the wheel and in spite of the noise continues to try to turn those front wheels just a bit more....

I've learned to listen for such indications!

 

[beppington]

I've had similar situations with my GC when lifting the MMM (same as 3PH); I get a warning, however, when the stop is reached- a higher-pitched whiny noise, indicating hydraulics have reached the end of their travel.

Sort of like a parking-lot power steering situation when somebody cranks on the wheel and in spite of the noise continues to try to turn those front wheels just a bit more....

Now that the engine clearly bogs, that's my indicator. In the beginning when the loader would change & go really slow, or the one time the tractor speed "seemed" a little slow, I couldn't hear any difference. Now I can bring the 3PH all the way up & very obviously/ noticeably bog the engine & hydraulics, whereas it didn't do that in the beginning of this saga.

 

[DiezNutz]

...I get a warning, however, when the stop is reached- a higher-pitched whiny noise, indicating hydraulics have reached the end of their travel.

Relief Valve.

Bep, you will want to figure out where the interference is and have it adjusted, since this is not normal.

 

[irvingj]

"Relief Valve." Yep, knew that, thanks. Guess my litlle GC's quiet enough that I can hear it....

 

[Dead Horse]

Hey guys........

I had this happen with my 3710 when I was running a snow blower on the PTO. (Years ago, and I had forgotten about it. A post above reminded me of it.)

The problem was that the PTO shaft was not cut short enough and at full "lift" it created a DANGEROUS hard stop for the lift geometry.

I say "dangerous" because the bearing in the tractor PTO output shaft is not designed for thrust forces.

Edit. never mind. different problem..........

 

[beppington]

My dealer told me the top of the left (when looking at the back of the tractor) lift arm has an adjustment to correct my problem. I haven't had a chance to check it yet.

 

[Chilly807]

Seems like a few Kubotas have had the same problem lately. The feedback rod tells the valve when the 3 ph is fully raised so as to stop applying pressure. The dealer should either send out a service rep or give you detailed directions as to how to adjust it properly. If they don't want to do that, we can walk you through the logical way to adjust it, particularly if someone here has a manual for the 3940.

Sean

 

[beppington]

My dealer offered to take care of it at the 50-hour service visit, but also gave me detailed instructions on how to do it myself, which I will go ahead & do.

Thank you ...