How To Replace A Riding Lawn Mower Drive Belt. If you’ve got a riding lawn mower at home and you need to replace the drive belt in order for it to start functioning correctly again, then you’ve found the right post. We’ve got just the experts for you if you want to book our Mobile Small Engine Mechanic and have it done. We’ve also got just the right information for you to do it at home by yourself. Here’s a step-by-step guide on how to replace the drive belt in your riding lawn mower. Read the instructions we’ve listed below, follow them carefully and your lawn mower should be just fine when you’re done. First you need to carefully place your lawn mower on a flat, level surface and set the parking brake. Now, you need to check the engine’s temperature and ensure that it’s cool before you begin. Remove the spark plug wire so that the engine doesn’t start while you’re working on the mower. Remove the mower’s cutting deck and then lift the seat to get to the battery. Disconnect the battery, starting with the negative cable first and then the positive cable. Now, you need to loosen the transaxle pulley. Use a spring puller or a piece of rope to disconnect the spring from the anchor bolt on the left side, so that you can relieve the tension on the upper drive belt. You now need to remove the upper drive belt and the lawn mower belt via the battery compartment. Remove the belt from the variable speed pulley. Remove the belt keeper. Now, remove the bolt which secures the crankshaft pulley. Ensure that you remember where each part is located before you begin the installation of the drive mower belt. Remove the mower’s lower drive belt. Now, you can go ahead and install the new lower drive belt. Apply the anti-seize compound to the crankshaft, to make it easier for the crankshaft to be removed later. Install a spacer and make sure the rounded shoulder is facing the engine. Install the crankshaft pulley and bolt, then tighten them both with a torque wrench. Carefully replace the lower transmission belt. Re-install both the lawn mower belt keeper and the belt guide. Install your lawn mower’s new upper drive belt. Now, reinstall the tension spring and connect it to the mower’s left side. Secure the transaxle pulley by tightening the large nut that holds it in place. Examine the speed control linkage and the cruise control/parking adjustment on the variable speed belt drive. Put the mower’s cutting deck and the battery back in. Reconnect the spark plug wires to the spark plugs so your engine can start. Finally, test your lawn mower to see how it works. If you are looking for small engine repair services in Ottawa, mobile car battery boosting, lawn mower and lawn tractor repairs and tune-ups, or snow blower repairs then give us a call to book your mobile small engine repair today. We fix, repair, and tune-up small engines such as lawn mowers and snow blowers. The best part is that we come to you so no more waiting in line or traveling back and forth to fix your small engine equipment.