LA481 Front loader control valve air noise

[Yankeeace9]

I am new at do service on my kubota but don't have the $ to have shop service the things wrong with it. I'm in process of changing hydraulic fluid on L3010 and also a hydraulic hose that has leak and in process noticed that the control valve assembly (standard valve type) is making a slight air noise when moving the control lever to the dump position and back to the center. I noticed this with the tractor off when I moved the control lever back and forth to release pressure to remove the leaking hose. I'm not 100% sure but the slight air noise sounds like it is coming from the out port on the bottom of the control valve. Is there supposed to be a air noise or is the system supposed to be completely sealed? Could it be a seal? Any help would be great.

 

[200mph]

Can't help with your question but Kubota has detailed illustrations that can be very helpful.

Perhaps this link will help you get started. Just follow the prompts.

https://apps.kubotausa.com/illustrated-parts/

Messicks and a few others also offer parts breakdown along with prices for the parts.

Hope someone else can answer your question directly.

Good luck!

 

[vic gerbasi]

I am new at do service on my kubota but don't have the $ to have shop service the things wrong with it. I'm in process of changing hydraulic fluid on L3010 and also a hydraulic hose that has leak and in process noticed that the control valve assembly (standard valve type) is making a slight air noise when moving the control lever to the dump position and back to the center. I noticed this with the tractor off when I moved the control lever back and forth to release pressure to remove the leaking hose. I'm not 100% sure but the slight air noise sounds like it is coming from the out port on the bottom of the control valve. Is there supposed to be a air noise or is the system supposed to be completely sealed? Could it be a seal? Any help would be great.

Just be ready with many containers when emptying the hydraulic fluid it is a high volume be prepared i cant help re air noise but im sure someone here will let you know best sight ever for kubota

 

[North Idaho Wolfman]

Most likely your just hearing the fluid moving when not under pressure sounds more like air than fluid.

 

[Kingcreek]

I have a LA481 also. It has always made a sound like you describe that I'm sure is just HF moving fast thru the valve. It is most noticeable if I drop the frame quickly.
Welcome to the forum.