Hello all. I've got an older Link Belt 100 ton lattice crane. I believe 70's model. 218A I think. I lowered the boom down yesterday to take the jib off and it took a lot of throttle to get the boom off the dog when I went to lower it. While I was lowering it I stopped it a few times to make sure everything was working there and down works fine and it holds when the lever is in the neutral position. After we got the jib off I went to raise it back up and I had to give it full throttle to move it and if I throttle down at all the boom wants to fall. Fluids are all good. Pressure reads 900 like it always does. I thought the brake was slipping but I had someone else run it while I watched it and it doesn't seem to be. I'm hoping this is a simple adjustment somewhere but I don't have much for a service manual on it. Can anyone point me in the right direction? We had a mechanic that was somewhat knowledgeable on it but he retired a few years ago. I'm going to try to get him to come look at it if I can. Thank you.