Kubota l4610 slow fel poerformance

[emanaresi]

Yeah, I was able to open it and I actually allready had a parts diagram for the loader, but thanks. I just don't know what the load check things do and if I should be concerned with them at all.

 

[J_J]

The primary purpose of load check is to hold a load while shifting.

It also keeps the load from pushing fluid back to the in port

It is like a spring loaded poppet sitting on an orifice.

If it does go bad, you will have all sorts of weird hyd actions.

You can remove the plug and inspect things and if needed, replace parts and re-assemble.

Sample load check valve.

 

[Leejohn]

Good way to know if your load checks are bad is, Bucket full of dirt and about 1/2 way up and then you want to put in a trailer, you pull back to go up and load drops about a foot. Then you let go of the lever it stops right now, back wheel come up then drops back down. At the same time you are all over in the seat, now your bucket is 1/2 full. After all that the you say wow my load check must be bad. Posted just to see if I can see the smile all the way to Mo.

 

[emanaresi]

Ok, I did play around with the tractor this weekend, I didn't have much time though. I did try a few things and I just cannot wrap my head around the issue.

The FEL hydraulics are slow, I didn't have the time or a clean bucket to try seeing how much flow I was getting, but I will try that soon.

Can we postulate a solution for the weird raise and lower functionality? When you pull the lever back about halfway to raise the loader, it goes up (somewhat slowly) If you pull it fully to the raise position the bucket stops going up. If you return to about half travel, it starts raising again!. I disasembled the springs and float detents at the end of the spool and everything seems to be in order and installed correctly according to the drawing. I reassembled it and the same symptoms were present. Could a restriction in the return cause this problem? Could poor flow from the pump cause this problem? Should I just invest in a new loader valve and see if it clears up the issues? I can get a new loader valve from surplus supply, I think this one would match well: 2 SPOOL COMPACT 10 GPM JOYSTICK CONTROL VALVE

I just don't want to spend 250+ and still have weird problems.

 

[J_J]

You never did say if the 3pt was working correctly, and if so, then the pump is probably good.

Does flow increase as you push or pull the lever?

Have you checked all QD for proper operation?

 

[emanaresi]

I did disconnect and reseat the QDs, How can I tell if they are operating correctly other than that? How do I know if flow increases as I push/pull the lever? Must I disconect the hose and put it in a bucket? I am able to feather it a little, until it stops at that point where pulling it further no longer works, so, yes, it seems flow increases to a point, then stops...

Also, I don't have a 3pt implement to put on and test, I could take off the backhoe and put on the 3pt arms and just see if they go up and down. I do know that they lift, I just don't know how quickly. When I first got the tractor I thought that they didnt work, but they were just a little stuck from not being used for a long time (I think the backhoe has been on the tractor pretty much its whole life).

 

[J_J]

Did you ever install a hyd valve and use it to trouble shoot the pressure problems.

Can you max out the cyl and make the relief valve activate?

You asked how you can tell about the flow rate. The GPM of the pump will determine the speed of operation. You control that by pushing or pulling the lever.

There are formulas to determine the flow rate verses speed of operation.

If you really want to know about the pressure and flow, then take it to a hyd person or business and they should have a flow meter to determine the pressure and flow rate under any given situation.

 

[the whispering oaks farm]

I did disconnect and reseat the QDs, How can I tell if they are operating correctly other than that? How do I know if flow increases as I push/pull the lever? Must I disconect the hose and put it in a bucket? I am able to feather it a little, until it stops at that point where pulling it further no longer works, so, yes, it seems flow increases to a point, then stops...

Also, I don't have a 3pt implement to put on and test, I could take off the backhoe and put on the 3pt arms and just see if they go up and down. I do know that they lift, I just don't know how quickly. When I first got the tractor I thought that they didnt work, but they were just a little stuck from not being used for a long time (I think the backhoe has been on the tractor pretty much its whole life).[/QUOTE
The reason why JJ is asking about the three point is when I have my backhoe on you have to pull the rear remote to put it into the ON position and it has a constant flow to it. When it is in that position it is taking away from all the other hydraulics. It will affect all the other functions of your tractor. you don't have enough pump capacity to supply both ends at once. this could be your problem.

 

[emanaresi]

My backhoe is connected to the power beyond port on the loader valve and the 3pt hitch lin gets disconnected when the backhoe is attached.

I did try disconnecting the backhoe and reconnecting the 3pt hitch line. It didn't make any difference.

 

[J_J]

You have 9.6 GPM at max engine rpm, can you not tell the difference of full flow to low flow? One way is speed of operation of anything hyd.

Did you ever try to measure the pump flow in the bucket.

If the bucket cyl are the same size as the lift arm cyl, the speed of operation should be the same at max lever and max engine rpm.

Have you measured the pressured yet?