I finally went to pick it up and got a different story. They originally told me it would need to be loaded by fork lift but when I got there the guy that got it ready for me told me he was able to get it to work ok by slowly letting out on the pedal until it engaged. They were actually able to drive it up the ramps of my trailer although it was tricky because it was difficult to get it to engage everytime. I am wondering if the control valve is sticky/dirty of in need of overhaul. Is there a good service manual available that describes tests to the system?

Thanks,
Greg