Combines hydro slip

Check the foot-n-inch valve relief pressure. Sometimes all it needs is a few shims in this valve. Not sure what it should be on a 60, but probably somewhere around 5600 psi. That's the simplest fix. The next is high pressure relief valve. It has two of these. A reverse and a forward. Does she pull better in reverse than forwardIJ In my experience they either work or quit altogther though. There are other possibilities you probably don't want to know about. At least one of them gets rather expensive.

Does it get worse as it heats up.I used to have a 1660 with the same problem.The hydraulic cooler was a bugger to keep clean but did solve the sluggish hydro problem.