I have a 165 Hydro, mine has a small lever just in front of the seat that has to be pushed (and held) sideways before you can move the machine. This is an awkward method, and only good for a few feet at best. Many of these levers become stuck due to lack of use) Might be able to take a couple mover dollies (the square frame ones) and set the rear wheels on them.
If the lever does work, and allows movement, you can wrap a coat hanger or similar wire around it, and fasten to the frame to hold the lever over. You can see the wire on mine in this picture.
Edited by larrybl, March 24, 2017 - 11:35 AM.