Riding Mower and Tractor: Won't cut grass
If the tractor runs, but the blades won't cut the grass, the problem could be with the blade belt. Examine the belt and replace it if you find it worn or broken. If the belt is okay, check the blade belt idler pulley, blade clutch cable and clutch lever assembly on tractors with manual blade actuators. On tractors that use a PTO switch to activate the blades, check the PTO switch and the electric clutch. Failed mandrel pulleys can also prevent the blades from spinning properly.
These repairs may help solve your Riding Mower and Tractor problem:
Replace the riding mower blade belt
The blade belt spins the blades to cut the grass. A worn or broken drive belt won’t spin the cutting blades so your mower won’t cut the grass. Examine the blade belt regularly and replace it if it’s worn or broken.
Replace the riding mower drive belt
If your riding lawn mower won't drive forward or slows down when you go uphill, check the drive belt. Reinstall the lawn tractor or riding mower drive belt if it's slipped out of place. Replace it if it's damaged or broken,
Tune up the riding mower engine
The engine tune-up includes routine maintenance for a riding lawn mower or tractor. This tune-up includes replacing the engine oil, oil filter, air filter, fuel filter and spark plug. The tune-up also includes checking the ignition, carburetor, battery, throttle and choke controls, as well as cleaning the engine cooling fins.
Replace the riding mower mandrel assembly
If a noise comes from the mower deck while the riding mower or lawn tractor is running, or if the mower isn't cutting evenly, you might need to replace the riding mower's mandrel assembly.
Replace the riding mower PTO lever
If the lawn tractor mowing deck won't engage or the lever is broken off, you might need to replace the PTO lever.
Replace the riding mower deck idler pulley
You might need to replace riding mower deck idler pulley if a noise comes from the mower deck when the riding mower or tractor is running, if the belt is loose, or the belt comes off.