Jalousie windows are a mainstay in older mobile homes. Replacing windows is expensive, so I'm replacing my non-functional gearboxes with new units. In most cases, replacing the gearbox will enable the window to crank fully open and closed again. It's simple in theory, the hardest part is maneuvering in the limited space to replace one, but I'll show you how to get it done!
Remove the crank handle by pulling it straight out.
Notice in the picture that the window frame is still in front of the gearbox. You will need to either remove that side of the frame or shift it out of the way.
Place the new gearbox onto the end of the bar. Be sure to line up the slots in the bar with the two ridges inside the sleeve of the gearbox.
You do not need to remove the mount on the other end unless it is broken and also needs to be replaced. Both of these parts need to be securely fastened to the window box for the window to work.