I have the 6502 (the smaller slide) and if I understood the dealer walk thru, there are (2) boxes @ either side of the slide (on the floor). You need to open the box (you need a screwdriver) and then you need to disengage the motor(s). Once that's been done, you should be able to push it (no manual crank...not on the 6502)
Looking forward to Spring! I was only able to go 1 time before I winterized it