1. Drive Belt: The drive belt connects the engine to the transmission, powering the wheels of your lawn mower. If the drive belt is broken, worn out, or loose, it can cause the mower to start but not move or drive. Inspect the drive belt for any damage or looseness, and replace it if necessary.
2. Tighten the Drive Belt: If the mower starts but doesn't move or drives erratically, the drive belt may be loose. Tighten the drive belt according to the tension specified in the owner's manual. A loose drive belt can slip and prevent the mower from moving properly.
3. Belt Routing: Ensure that the drive belt is correctly routed around the pulleys according to the routing diagram provided in the owner's manual. Incorrect belt routing can prevent the mower from moving properly. Double-check the belt routing to ensure that it's accurate.
Other Potential Issues:
1. Transmission Problems: If the drive belt is in good condition and properly adjusted, the problem could be with the transmission itself. Check the transmission fluid level (if applicable), and look for any signs of damage or wear. Transmission issues might require a professional repair.
2. Brake Issues: Malfunctioning brakes can prevent the mower from moving or driving properly. Check the brake system, including the brake cable, brake lever, and brake pads, to ensure that they're functioning correctly.
3. Damaged Gearbox: In some cases, a damaged gearbox can cause the mower to start but not drive. Check the gearbox for any visible signs of damage, and consult with a professional if necessary.
4. Clutch Problems: If your MTD 30 lawn mower has a manual transmission, the problem could be related to the clutch system. Check the clutch cable or linkage to ensure that it's correctly adjusted or not worn out. A worn-out or misadjusted clutch can cause the mower to start but not move.
