I've got a neighbor that has a 646 with loader and backhoe (that I've been trying to buy ever since I moved here). Onan engine. The back hoe works fine, with fine power, the front loader hydralics work fine as well but he says that when driving he has to keep it in low range and still bogs down and has almost no drive power. Does anyone have any idea what would cause this? I will say that the return line from the backhoe valves looks like it is kinked slightly but I'm not sure that it is enough to cause issues.
Thanks for any help.