Man using sting trimmer on grass

Traditional bump-head string trimmers are a great tool to keep your yard looking great. Cub Cadet trimmers work by feeding plastic string out of the cutting head. There’s no blade to sharpen so these trimmers are easy to use and maintain. Simply bump the cutting head against the ground while it’s spinning to release the trimmer line. When you run out of trimmer line, use our experts’ instructions to learn how to quickly replace trimmer line in your bump-head trimmer.

Before performing any maintenance on your Cub Cadet trimmer, refer to your owner’s manual for maintenance instructions and safety information. Maintenance instructions vary by model, so depending on your trimmer model our instructions may vary slightly.

Begin by cutting 10 feet of new trimmer line. (Either 10 feet of twin-strand split line, or two ten-foot lengths of .095″ trimmer line should work.) Check your owner’s manual to find out exactly what kind of trimmer line to use for your bump-head string trimmer.

Then unscrew the bump knob and remove the inner wheel and spring. Set aside the spring for now.

Install the trimmer line. To do so, locate the two holes on the top of the inner reel and insert one end of each length of trimmer line into one of the holes. Pull them through so that the ends match up, and two to three inches of trimmer line remain.

Insert the short ends of the trimmer line into the other inner reel hole. Then pull the long end of the string to close the loop.

Follow the direction of the arrow on the top of the wheel, and tightly wind the trimmer line around the spool. When 6 inches of string remain, push the ends into the holding slots marked 0.95.

Last, reassemble the string trimmer bump head. Locate the spring you set aside earlier. Replace the spring on the shaft. Locate the eyelets on the spring head and feed the trimmer line through.

Place the wheel back on the shaft, and line up the holding slots with the eyelets on the cutter head. Hold down the wheel to compress the spring, and then screw the bump knob into the head.

Gently pull both ends of the bump-head trimmer line to make sure it’s been released from the holding slots.

Use our illustrated parts diagrams to locate any replacement parts you may need for maintenance for your Cub Cadet trimmer.