743 hydro squealing when lifting boom or tilting bkt.

[PEVO]

Bobcat been sitting a while ...2 months. Has a hydro leak. Has always worked fine before now. Anyways started it up to use this weekend and upon lifting boom hydros squeal like pig. Drives fine just using the boom and or tilt bkt...and it squeals and is jerky. Was low on fluid and added a gal. But had to stick the tank to find the level (sight glass sucks cant see nothing) anyways squealing got better but was still very noticeable. Whats up? I stick the tank and even after adding fluid was only like 1/4-1/3 full. im assuming it was sucking air due to leaky hose. However even after adding fluid i didnt stop. I didnt use it much just hauled a couple loads of dirt to fill low spots around a backyard fence to keep dog from escaping. even then i manually shoveled the dirt so i didnt work the bucket much. it did seem to have plenty of lift regardless of the squeal. Thoughts, ideas, suggestions???

 

[Tazza]

It's possible that the issue is just air in the system, it does take a little time for the air to purge from all the lines, so it will be loud and jittery till it's all gone.
Hopefully that is athe only issue with it.
The best way if there is a lot of air, run it for a few minutes then shut down, let it sit for a few hours then run it again.