I don't know them all THAT well. In fact I don't LIKE the Unimech chassis all that well!
The Model 62 is a glorified 6-300 (the Garrard 440 is even LESS glorified) with the REVERSED pusher mechanism for the spindle, so it pushes the record toward the left front of the unit to drop it off the spindle ledge and side platform, instead of toward the right rear. This does not affect the part of the mechanism that controls where the tonearm drops.
DOWNLOAD THE GARRARD 6-300 SERVICE MANUAL FROM THE LIBRARY SECTION!
In the attached photo of the Unimech subchassis removed from the unit, the part with the broad V-shaped slot is what "tells" the tonearm where to set down. Make sure that it is free to move and that everything that is associated with it, including the pin that rides in that slot, is also free to move, and not broken. Unfortunately these parts do not have identifying callouts in the service manual; they were supplied only along with the Pickup Base Assembly. And equally unfortunately, you have to do a major teardown to get the mechanism subchassis and the tonearm base out to where you can directly service them...and that's where the instructions for doing that, in the service manual, come in handy.
CLICK on the photo, then CLICK AGAIN to enlarge.
Note that occasionally one of the sloppy plastic control levers for speed/size will break, and will not be controlling the setdown mechanism, only the speed. This is because the setdown mechanism usually freezes up long before the speed change mechanism, and excess force was applied by the user.
After you enlarge the photo, look at all that excess grease on the subchassis/pickup base...and imagine what good cement it makes when dry and hardened!