L3301 HST w/LA525. Bucket does not go up and down well

[furry9900]

All the other hydraulic functions. The bucket will roll like is should. The bucket will fall freely when put in float. Sometimes it will go up fine then stall and go very slow. Down is very slow. Will go up and down decent if rolling at same time. Please help me out. I have tried new hoses to valve. It's driving me crazy.

 

[North Idaho Wolfman]

Have you replaced any of the quick disconnects?

 

[furry9900]

Have you replaced any of the quick disconnects?

No. I did take them apart and looked good. But that would make since like one is restricting it. Could I just swap the lift ones for the roll ones and try that. Or remove them completely. I never have removed the thing anyways.

 

[TheOldHokie]

No. I did take them apart and looked good. But that would make since like one is restricting it. Could I just swap the lift ones for the roll ones and try that. Or remove them completely. I never have removed the thing anyways.

You cannot swap the connectors on that valve.

If the 3pt is raised lower it and see if that fixes the problem.

Dan

 

[furry9900]

You cannot swap the connectors on that valve.

If the 3pt is raised lower it and see if that fixes the problem.

Dan

The 3 or is all the way up. If dropping it fixes it what would that mean. Before I started working on it today the fluid was full and looked really good. I'm sure it's low now with all the hose swapping I have been doing.

 

[TheOldHokie]

The 3 or is all the way up. If dropping it fixes it what would that mean. Before I started working on it today the fluid was full and looked really good. I'm sure it's low now with all the hose swapping I have been doing.

If lowering the 3pt resolves the problem the feedback linkage is out of adjustment. Simple fix.

I have an L3901 witj LA525 loader and it is an easy system to diagnose. Understanding the circuit and doing a little targeted testing will identify the problem faster and with less expense than throwing parts at it

 

[furry9900]

If lowering the 3pt resolves the problem the feedback linkage is out of adjustment. Simple fix.

I have an L3901 witj LA525 loader and it is an easy system to diagnose. Understanding the circuit and doing a little targeted testing will identify the problem faster and with less expense than throwing parts at it

I definitely do t understand the circuit I can't even find a good schematic for it. I will give that a try tomorrow and if so will look for more information. I do t have the money to throw parts at it and don't really want to take it to the dealership.

 

[TheOldHokie]

I definitely do t understand the circuit I can't even find a good schematic for it. I will give that a try tomorrow and if so will look for more information. I do t have the money to throw parts at it and don't really want to take it to the dealership.

You can download the workshop manual here. It explains the sytem in considerable detail and is replete with schematics and illustrations:

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3301%20L3901%20L4701%20WSM.pdf

Your symptoms are a perfect match for power beyond blockage downstream of the loader valve and the typical source of that blockagecwould be a 3pt control valve thats not in neutral:

1. The boom exhausts to power beyond (3pt) and the blockage prevents the boom from moving
2. The bucket exhausts to tank via tank port on loader valve and it is not blocked.
3. The boom spool is serial so when boom and bucket are operating simultaneously boom exhsust oil goes to bucket inlet and from there to tank via tank port so neither function is blocked

I did all of that analysis without changing any parts, spending any money or involving a dealer. All that remains is for you to lower the 3pt and see if it is the source of your problem

Dan

 

[furry9900]

You can download the workshop manual here. It explains the sytem in considerable detail and is replete with schematics and illustrations:

https://www.kubotabooks.com/AutoIndex/index.php?dir=Tractor%20Owners%20Manuals/&file=L3301%20L3901%20L4701%20WSM.pdf

Your symptoms are a perfect match for power beyond blockage downstream of the loader valve and the typical source of that blockagecwould be a 3pt control valve thats not in neutral:

1. The boom exhausts to power beyond (3pt) and the blockage prevents the boom from moving
2. The bucket exhausts to tank via tank port on loader valve and it is not blocked.
3. The boom spool is serial so when boom and bucket are operating simultaneously boom exhsust oil goes to bucket inlet and from there to tank via tank port so neither function is blocked

I did all of that analysis without changing any parts, spending any money or involving a dealer. All that remains is for you to lower the 3pt and see if it is the source of your problem

Dan

Thank you. I'll do it first thing tomorrow

 

[TheOldHokie]

Thank you. I'll do it first thing tomorrow

Good luck. Hopefully thats the problem and a tweak of the linkage will fix you up.

Dan

 

[furry9900]

Good luck. Hopefully thats the problem and a tweak of the linkage will fix you up.

Dan

Works like a charm with the 3pt down a little bit. As soon as I raise it to max it stops again. So now to find that linkage and adjust it

 

[TheOldHokie]

Works like a charm with the 3pt down a little bit. As soon as I raise it to max it stops again. So now to find that linkage and adjust it

Excellent. You adjust the postion control shutoff point with the two nuts (180) and bracket (170) on the aft end of the feedback rod (160). Shorten or lengthen the working length of tĥe rod as needed.

Dan

 

[furry9900]

Excellent. You adjust the postion control shutoff point with the two nuts (180) and bracket (170) on the aft end of the feedback rod (160). Shorten or lengthen the working length of tĥe rod as needed.

Dan

View attachment 127651

Thanks again.