964-04007A Grass Catcher Bag, for Replacement Part 21 Inch Grass Bag, Compatible with MTD 664-04007, 664-04007A, 664-04011, 664-04027, 964-04065- (Without Grass Catcher Frame)

What It Is

This is a replacement grass catcher bag designed for 21-inch walk-behind mowers. It replaces the OEM MTD part numbers 664-04007, 664-04007A, 664-04011, and 664-04027, and is used to collect clippings during mowing. It does not include the grass catcher frame, so you need to reuse your existing frame.

Fitment & Compatibility

Before buying, verify three things:

1. Deck size: This bag is for 21-inch mowers only. Measure your mower deck width.
2. Brand/model: Compatible with MTD, Troy-Bilt, Cub Cadet, Yard Machines, and Yard Man mowers that use the OEM part numbers listed above. Check your mower’s model number or look up the OEM part number in your owner’s manual.
3. Frame: You must already have a grass catcher frame (the metal or plastic support structure that attaches to the mower). This bag slides onto that frame. If your frame is missing or broken, buy a frame separately.
4. Physical dimensions: The bag is roughly 20” x 12” x 10” when installed. Measure your frame’s attachment points to ensure a snug fit.

Key Things to Know

• Material: Made from heavy-duty woven polypropylene. It lasts a season or two with regular use but may tear if overfilled or exposed to sharp debris.
• Installation: Easy – simply slide the bag’s collar over the existing frame and secure with the provided drawstring or hook-and-loop strap. No tools required.
• Common gotcha: The bag’s opening must align perfectly with the mower’s discharge chute. If your mower has an odd-shaped chute or a different frame design, this bag may not seal properly.
• Capacity: Holds about 1.5 bushels of clippings. Expect to empty it frequently in thick grass.

Should You Buy It

Buy this if you have a compatible MTD or similar 21-inch mower with a working frame and need an inexpensive, direct replacement bag. Skip it if your mower’s frame is missing or damaged, or if you need a bag for a different deck size (e.g., 22-inch or riding mower). For heavy commercial use, consider a heavier-duty bag.