TLB L35 hydraulic noise

Hi folks, I'm a newbie to this forum. I've had my tractor for nearly 10 years and I don't know how I would have gotten along without it. Its like my horse.

Anyway she started making a high pitched noise last winter when I switched from the quick release backhoe to a snow blade. It was intermittent. Then last summer while back filling the noise became steady. I shut her down and now, this year, she wont stop screaming. i have changed the oil, replaced the hydraulic filter, and poured over the manual suspecting the relief valve.

Read the article about the suction line from this site, but I not sure if mine has a suction screen. There is a banjo fitting on the right hand side wherre hydraulic line appears to enter transmission. Wondering if there is a screen there and if cleaning it will solve my problems.

I pray it isn't the pump but the noise is coming from the front end- guessing pump is starved. Forgot to mention, bucket moving slow and 3 pt hitch lift arms not moving at all.

Appreciate any help.

Thanks

I've got 2700 hrs. Last year broke a hose and had to replace. I didn't bleed the line just drained the rest of the fluid and put in new hydraulic fluid. She ran fine.

Considered pump but before proceeding down that road wanted to confirm that I hadn't left any other possibility out, like plugged screen. But dont know if mine has such a screen or perhaps other filter?

Steering and shifting okay. Up until recently the lift arms were okay but them not working is a recent development.
The diagrams are very helpful. Thank you.

Trying to figure out best approach. Likely have to drain the system. I did notice that there was a little too much hydraulic fluid. L may have overfilled. it shows about a 1/4 in above the max line.

Here's some great news, the problem seems to have fixed itself, I hope!

I decided to attache the hoe so I could get ground clearance for drain buckets. The tractor was screaming like a tuck pig. I shut off the engine when I was close to the hoe, hooked up the lines, switched the routing lever in the back from 3 point hitch to backhoe and started the engine. To my delightful surprise the screaming was gone. In fact I moved the machine about. stopped undid the hoses, started the tractor in 3 point hitch and still no screaming.

I am really happy because everything works and I wont have to be shopping for a pump.

But the screaming didn't go away entirely. When I tried to pop the rear hydraulic lines with the engine running she started again. At times it started as a whine and the, I think, as pressure built up it was full on screaming. I would shut off the engine and hook up the hydraulic lines and when the engine started, the noise was gone.

I am hoping this is something normal, likely pressure relief valve?

Anyone else experience this?

I have had my Kubota for almost 10 years and very familiar with its operation. When I disconnect backhoe I always reconnect to hydraulic line and shift lever to 3 point hitch.

What I was experiencing never happened before, and I am suspicious of contamination in the hydraulics affecting valves. The tractor would whine if I tried to hook up the line while the engine was running and typically the pressure would build until I shut the machine off. I had trouble prying off the lines because of pressure build up.

The noise I heard recently sounded similar but became a ear piercing scream with the additional loss of lift arms, overheating, and loss of power.

Thanks for your comment.