Loader Kubota LA950A loader weak

[ussofa]

Hello all, I am new to this site and new to Kubota tractors. I have a question I was hoping someone might know the answer to. I bought a used L4850 Kubota 4wd with just over a thousand hours on it. The LA950A loader, model 1770A, will not lift a load of dirt. It even has problems with a half load. I have not attached any other equipment to it.I am told this tractor should be able to handle this size loader no problem. Any ideas of what I might check? The fluids are all full. Is there more than one way to route the lines to get more pressure?

 

[Gale Hawkins]

Have you yet changed out all the filters/fluid?

Most all pressure testing requires the filter and fluid to be up to specs.

 

[ussofa]

No i have not.

 

[Gale Hawkins]

I have a slow shifting shuttle when in gets hot on the JD. I have the filters fluids but with all the rain I have not got my 1st step done.

 

[ussofa]

Could the fluid and filters make that much difference? The tractor was not used much and appears almost new.

 

[Gale Hawkins]

Perhaps not but if the condition of them are not known then the next main thing is the pump/valve factors.

The fluid and filters are overdue for a change I expect if never changed. Not sure about yours but I was look at my JD backhoe manual and it called for a change at 50 hours and then every 500 hours.

For many of us when we buy something without records we assume it needs to be done and then we keep up with it after that.

 

[magicheater]

I have the same loader but have experienced no problems. Did you check the 3PT lift? If that is weak as well it could be a pump problem, if not maybe a valve is sticking in the loader control. The 3PT lift should have a 3300 lb. lift or greater on your model. I have an L4350 and it is 3300 lbs.

 

[ussofa]

The 3 point lift seems to work fine.

 

[Yankee Clipper]

US,

Try this - lower your hitch to the mid poiint and see if the loader now has power to lift a bucket full of dirt.

If it does, the follow up linkage on the three point needs to be adjusted.

If no difference is noted, then likely the relief valve needs to be adjusted up to a higher pressure.

Try doing the test and see if there is a difference in what the loader will lift.

Good luck!

 

[magicheater]

The 3 point lift seems to work fine.

How much load did you have on it? Have you changed the filters yet?

 

[kuboman]

Check the hydraulic fluid that it is not contaminated with water. Many tractors that sit outside get water in the hydraulic/transmission case and that will compromise performance.

 

[clinter36]

I have the same rig with about 1500 hrs and I have lifted some pretty large rocks. In fact I can tell you that without a weight bucket I can lift the rear tires off the ground without any problem.

When you attempt to lift the full load of dirt/stuff, does the engine change RPM or bog down at all?

If the engine is affected then it could be a whole host of different problems.

Did you have a backhoe with you tractor?

 

[ussofa]

Thanks for the info. As soon as it quits raining here I will give this a try and let you know how it worked.

 

[ussofa]

I had a 6' back blade on. I have not gotten a chance to change anything yet. I will let you know as soon as I do.

 

[ussofa]

No, it does not seem to make any difference on the RPM's. Increasing the gas also had no effect.

 

[ussofa]

I have the same rig with about 1500 hrs and I have lifted some pretty large rocks. In fact I can tell you that without a weight bucket I can lift the rear tires off the ground without any problem.

When you attempt to lift the full load of dirt/stuff, does the engine change RPM or bog down at all?

If the engine is affected then it could be a whole host of different problems.

Did you have a backhoe with you tractor?

No backhoe with it.

 

[ussofa]

US,

Try this - lower your hitch to the mid poiint and see if the loader now has power to lift a bucket full of dirt.

If it does, the follow up linkage on the three point needs to be adjusted.

If no difference is noted, then likely the relief valve needs to be adjusted up to a higher pressure.

Try doing the test and see if there is a difference in what the loader will lift.

Good luck!

Lowering the 3pt halfway made no difference. Where is the relief valve located and what does it take to adjust it correctlly? [/I]

 

[Yankee Clipper]

US,

On the RH side of the transmission housing - close to the suction tube - is a valve. A tube comes from the pump discharge into the valve. This also is where the loader supply hose goes up to the loader valve and returns as well. Check to be sure the diverter between the hoses is straight up and down before doing any other checks - if horizontal, you may be bypassing the loader valve supply.

On top of this valve is a hex nut with an acorn cap / cover. Take the acorn cap off and loosen the jamb nut so you can screw in (CW) the jack screw to compress the internal spring.

Don't go nuts - turn it about half a round and check it. Go another half round and recheck. You should see a change in the loader ability to lift.

If not, then reset the RV where you started and have a dealer run a flow rate on your pump and RV check. Maybe your pump is getting tired.

Good luck!

 

[ussofa]

US,

On the RH side of the transmission housing - close to the suction tube - is a valve. A tube comes from the pump discharge into the valve. This also is where the loader supply hose goes up to the loader valve and returns as well. Check to be sure the diverter between the hoses is straight up and down before doing any other checks - if horizontal, you may be bypassing the loader valve supply.

On top of this valve is a hex nut with an acorn cap / cover. Take the acorn cap off and loosen the jamb nut so you can screw in (CW) the jack screw to compress the internal spring.

Don't go nuts - turn it about half a round and check it. Go another half round and recheck. You should see a change in the loader ability to lift.

If not, then reset the RV where you started and have a dealer run a flow rate on your pump and RV check. Maybe your pump is getting tired.

Good luck!

I just got finished changing out the filter and fluids and it had no effect at all. No better or no worse. I will check what you said first chance I get tomorrow and let you know the results. Thanks for the help..

 

[ussofa]

I just got finished changing out the filter and fluids and it had no effect at all. No better or no worse. I will check what you said first chance I get tomorrow and let you know the results. Thanks for the help..

SOLVED!

Yank,
Thank you-Thank you, That did the trick. I had to turn the screw a full turn before the loader would lift the front wheels off the ground. I suppose their is no way to know when you are at the right pressure without a gauge. The screw looked like it was turned all the way out. What a relief.
Again, Thank you. I hope I can assist you some day..