Replacing the Drive Belt on a Rear Drive Lawn Mower

What You'll Need
Drive belt
Belt guides
Adjustable wrench
Owner manual

A lawn mower is a fairly easy tool that can be fixed and replaced on your own with little supervision and help. If you are a little mechanically inclined, you can pretty much do all the repairs necessary. A drive belt is a necessary part of the lawn mowers driving mechanism. It should be replaced if it has developed tiny cracks, if it has become mis-shapen or if it has snapped and broke altogether. In order to replace the drive belt on your rear drive lawn mower, follow the directions below.

Step 1 – Check Your Owner’s Manual

Pull out the owners’ manual for your lawn mower. Keep it next to you while you complete this project. There are sometimes slight differences from one lawn mower to the next. To be aware of these differences and nuances, you may need to consult with the manual.

Step 2 – Purchase New Parts

Purchase a new belt and belt guides at your local home improvement center or local automotive parts store.

Step 3 – Prepare Your Work Area

Prepare your work area.  An organized and clean work area will make your job easier to accomplish. Take out all tools necessary, place a tarp underneath the ground surface to protect the floor from any accidental oil or gas spills.

Step 4 – Remove the Mower Assembly

The motor assembly on your lawn mower consists of the mower frame, which allows the mower to move over the ground smoothly while you cut the lawn, a reel, a support member, a spring. Using a wrench and a screwdriver, remove the entire assembly.

Step 5 – Remove Drive Belt and Belt Guides

The belt is the rubber ring around your lawn mower. The belt guides are usually made of metal clamps. The belt guides hold the drive belt in place. Remove the belt guides first and then the drive belt.  Pull them a part using an adjustable wrench. The belt guides are usually held in place with bolts. If your bolts are rusty, consider replacing them as well

Step 6 – Install New Belt and Belt Guides

Take your new belt and belt guides out of the packaging. Install the belt first and then add the belt guides. Tighten the new units in place using your adjustable wrench.

Step 7 – Start it Up!

Take the key to your lawn mower and start the engine. Watch the belt turn. Make sure it does not rub against anything. Make sure there isn’t anything in its way or causing an abnormal amount of friction. Turn the lawn mower off.

Step 8 – Re-Install Motor Assembly

Re-attach the motor assembly. You are ready to go! Your lawnmower's drive belt is fixed.

Step 9 - Clean Up

Clean up your work area. Throw away any open packaging, old parts. Put your tools away and fold the tarp back up.