Hi everyone looking for some other thoughts, have a couple older stone construction equipment rollers, our 43 inch roller (SD-43) lost its vibration on the drum, ended up it stripped out the splines, no big deal got it rebuilt and back together took it out for a test and works great until one of our guys went from full reverse to forwards rapidly, got a weird chattering noise, almost sounds like i piece of tin catching on a fan blade (not that) jacked the unit up and tried it under no load, no noises being as aggressive as I could smooth, put it back on the ground, and retried it thinking maybe a air pocket, no dice, no noise going from forwards to stop, just reverse to stop, have to be at minimum half throttle nothing appears to be loose to catch anything rotating thought maybe a brake but the machine is a hydrostatic transmission and the only brake is on the drum, and sound is coming from the rear half of the machine seems to be that the wheels are still turning a bit and forcing oil backwards through the motor but that doesn't make a lot of sense with stone construction products being defunct now support is limited so any thoughts be appreciated,
Photos would help . Any of the rubber isolators broken allowing metal to metal contact somewhere (scrapers)?
follow up its in the rear drive wheels area, in the hydraulic system. did find some diverter valves with damaged seals, waiting on parts to check, (5-7 weeks from valve manufacturer, apparently due to covid, seeing if can get seals matched up locally
seals did not help, there is nothing rubbing, at this point it has been put aside and let it run for a bit as has not completely gone yet. not much I can get a picture of for the issue