I have a old straight 750 and it has developed a problem losing charge pressure on one track only, it will work fine for about a hour or so then in any load it will drop charge pressure, when I back to neutral charge pressure comes back. I have checked charge pressure releaf valve and transmission releaf valve and both was good I also checked neutral charge releaf valve it also was good. Anybody have an idea where to go next. John deere dealer doesnt have a mechanic that knows anything about one this old.
Post your model and serial number of your machine. There are some pretty sharp people here that can assist you but will need that information.
This is a old 1979, it's a staight 750, the serial number is 266942t