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303 cr bucket drifts

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Have a 303 CR in my shed,was bartering some work and i noticed the bucket drift into the curled position. I also noticed the bucket doesn't have much holding power when trying to pick up a small load. The company had a thumb added and they hooked that up to the breaker lines,which really slams the thumb into the bucket if bucket is somewhat closed. The bucket will drift closed weather the oil is cold or warm,I also thought while I was using it the bucket drifted while the arm rest was up. Asking if someone knows if the cyl would be causing this or the relief valve is bad,or if their is some sort of a poppet valve. Thanks for the help svs

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