Recently purchased a 939c, the buttons on the joystick for horn and the hi/lo have not worked since I’ve had it. It’s a good running machine and pushes great in low. A couple days ago it seems that the left track has got in to the high side, running faster than either side ever has but doesn’t have the torque that it should in low. Any ideas or help in what direction to go would be greatly appreciated, thank you.
First suggestion would be to get yourself an Operation & Maintenance Manual. The Cat Publication reference is SEBU7087 and they cost around $50 new, so don't get ripped off paying too much for a used one. Here's a new OEM one on eBay Then you are going to need an electrical schematic. Check your message inbox.
Thank you!