Hello this is my first post so forgive me if somethings not right I have a case 1835c that has been giving me some problems it all started 2years ago I used it all summer without any issues but it sat outside for a night in the cold and wouldn’t move so I got it back home and check the charge pressure and was 260 psi so I figured it had to be the rotating groups pulled the pump apart and everything looked perfect no scoring on any of the brass surfaces so I reassemble did a filter and fluid change and everything worked perfectly again then last summer same deal used it just about everyday as soon as it got cold same thing checked charge pressure still good so back apart it came to find nothing same as last time everything looks perfect it’s like the bypass valves are open I disconnect the drive hoses and caped the pump and it’s definitely in the pump I can work the controls and not stall the engine I talked to a guy that was pretty confident it was the charge pump so I replaced it and it’s a little better but still not fixed any ideas would be greatly appreciated