Casement and French Casemaster Windows

General Care

The roto-gear is the operating mechanism that you crank to open and close your Casemaster and Awning windows. The Casemaster lock seals the window tightly closed. Excessive cranking when closing your window does not improve the seal and may damage your roto-gear.

Roto-gears should be lubricated once a year with white lithium grease (available at any hardware store) to keep operation smooth. The hinge joints and locking mechanism should be lubricated on occasion with a silicone-based spray. Be sure to clean off all dirt, debris or sand before lubrication.

The sash tracks should be occasionally cleaned out with a soft bristle brush, taking care not to damage the finish.

Note: If a Casement is less than 20" in height or width, the roto-gear arms and assembly may differ from those shown.

Problem: Crank handle comes off or does not turn.

Solution 1: Check the set screw on the side of the crank handle. Make sure it is screwed in firmly and is engaging the crank mechanism. You also can remove the handle by loosening the set screw.

Solution 2: Pop out the plastic crank cover and use a soft brush to remove any dirt or sand. If the handle will still not turn, the internal roto-gear mechanism may be jammed or damaged. Contact your local Marvin retailer for service.

Problem: Sash is difficult to open or close.

(If sash does not open or close at all, contact your Marvin dealer for help.)

Solution 1: Check for paint buildup around the sash. If paint is sealing the window closed, scrape excess paint off; open the window and sand until smooth. Refinish the window (leaving the sash open to dry).

Solution 2: If paint isn’t the problem, your sash could be swollen due to being left open in the rain or because of high humidity. You can sand any bulging, out of shape parts. You can also push the sash closed from the exterior and lock it, giving it a chance to dry out to the proper dimensions. In this way, the problem may correct itself.

Solution 3: Make sure the sash tracks are free of dirt, paint buildup, or raised screw heads. Clean tracks with a soft bristle brush. Lubricate the inside of the track with petroleum jelly or a silicone spray. Clean up any excess lubricant. If necessary, tighten any raised screw heads.

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