Hello, I have a u35-4 with 160 hours, digging a stump out no more then 400 lbs, I pulled it along the ground till it was close, picked it up via the thumb, raise main boom all the way up, and when I ran the stick out, the boom drifted down steadily, and quickly?? Do you think that might be a relief valve issue?? Because I'm pretty sure the weight was no where near the graph chart in my manual?? Thank you for your assistance!
