mg2361
Senior Member
I have an excavator in the shop with 7000 hrs on it and it has quite a bit of varnish (and some sludge) coating many of the internal components of the hydraulic system which I believe are contributing to the intermittent hydraulic problems the customer is complaining about. It does not appear to ever of had the hydraulic oil changed. I have a sample sent but the results are not back yet. Customer does not want to spend the money to tear components apart. My question is has anyone had any experience with the commercially available additives for removing varnish?