I've got an '87 Lynx TT. My problem is one of the window cranks will crank outwards, but not all the way back in, the last 1/2" it will not shut the window completely. The crank mechanism skips, (not the handle portion, thats tight)like the gearset is worn. How the heck do you remove it. There's 2 phillips screws on the idler end, and 3 screws that go through the mechanism in the window frame. I'm pretty mechanically inclined, but this crank refuses to budge more than 1/8th of an inch. Any solutions other than the BIG hammer, Thanks.

The crank mechanism may be bad. there are seveal types,check this site for parts. All-rite RV Parts

No doubt it's bad, found the crank replacement under Hehr products, now to get the old one out. Thanks.

Erich,
I am having the same problem with two of my windows. I am stuck in the same spot you are getting the dog gone crank out. I thought of the hammer too, but seemed like the crank would come out with a broken window frame. Did you ever get yours figured out? Thanks.

No, Not yet, matter of fact, I've more or less given up, I know this isn't going to sound right, but...the wife cranks(it shut) while I'm pushing it in(the window), once the window is flush, it pretty much stays there. I really think the only way to replace the crank mechanism is to remove the whole window and frame, and, right about now ambition hasn't pushed hard enough.

Pushing that window shut works until a sudden pressure differential causes it to pop open. Then the wind will flap it until the brackets break. Been there-done that! A really great RV service center manufactured a replacement window as I waited. (Des Moines, IA)

Hopefully I'll remember the procedure I used to replace a gearbox. I think I first ground the head off the rivets holding the window bracket to the arm on the bottom shaft. Then I removed the screws holding the shaft and gearbox in place; it then came out easily.
When I replaced everything, I bought some small bolts from a hardware store to replace the rivets. I used lock-tite on the threads to hold the nut in place. The nut cannot be tight on the bolt and still allow the brackets to pivot as designed.
Don't accept this as gospel, I replaced that gearbox about 20 years ago, and my memory is 20 years older.

Pretty Much what Ray Said...

I had this issue on a trailer of long ago... the crank gear box was riveted to the frame, so this had to be drilled out ... new box installed... careful not to lose the "C" clips.

No, there's no rivets on mine, one end has a simple "dummy" pivot that the rotating tube goes into, there's a slot in the tube and then the bracket that attaches to the "dead" side of the window glass frame(non crank end). The crank end has 3 screws that hold the crank mechanism to the window frame, no rivets. The rotating tube also has a slot in this end that engages a dog drive and then onto the bracket that rotates outward with the glass frame. I've taken the screws out of both ends, nothing, but I mean nothing gives or moves the slightest to indicate how to get it out. Maybe this weekend coming I'll give it another try and take some pictures to mull over.

Erich, what is the window manufacturer? Hehr perhaps- here is the Hehr service manual.
BTW, I stand corrected. Gearbox is not the proper terminology, the true name is "operator".

Ray, thanks a million or a couple of gallons of gas It's a Hehr "operator" and I found a replacement, now to follow instructions and get it fixed. Maybe I wasn't prying hard enough, didn't want to break something. Thanks again, much appreciated.