HI: I hope someone can help on this. I have a Genie Manlift Z45-22 MP. It uses hydraulic motors to drive. One hydraulic motor will not drive. This system has automatic brakes that kick in so it cant roll. Here are the hydraulic schematics. From what I can tell there is no left or right component if one side drives the other should? The wheel that works can not be rolled unless the motor is turning - the wheel that does not turn nder hydraulic drive free wheels ie i can roll it by hand ? Does this mean I have a problem with motor or the hub - how can I test this?