I'd love to help Ron but I'm a bit far away. I know there are folks over your way but can't recall their names. We can probably accomplish some of it here on the forum. First, do you have the operator's manual?
For the hand clutch, pushing it forward disengages the clutch, then if you continue to push forward you will apply the clutch brake, enabling you to shift into gear without clashing the gears. Are you able to assess the status on the clutch brake? Then, for engagement, pull the lever towards the seat and it should "snap over" center - kind of "clicks" in to place. If the snap is too soft, then the clutch needs tightening up a bit. I don't have the D4 manual and I think its adjustment is a bit different (although same theory) to my D2 so if we can get the moderators to move this thread into the main Discussion forum, you'll quickly get an answer.
For the steering clutches, if they're stuck and not releasing, then the trick is to drive around with your foot hard down on the brake on the side that's stuck to get it red hot (smoking), while working the lever to see if it will release. If the lever can be pulled right back and is kind of floppy, then the steering clutch on that side might need adjusting first to take out the slop. Get the brake hot, pull the lever back and then, if you have a blade bury it in the ground to try to stop the track on that side. A bit of to and fro and it might let go on you. If it does, then kind of ride the clutch a little bit to burn the rust off the plates and from then on use the usual steering technique of NOT riding the steering clutches - treat them like an on-off switch rather than feathering them. Only time you might feather is when trying to ease across a log or something where you need to inch.
GP - can you move Ron's thread to Discussion?
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