John Deere 100 Lawn , 34 Rotary Operator's Manual

To change the oil, run the engine for a few minutes to warm it up, then turn it off. Remove the oil dipstick and drain the oil by unscrewing the drain plug. Replace the drain plug, add new oil through the dipstick tube, and check the oil level. Refer to the manual for the recommended oil type and capacity.
Check the battery connections for corrosion and ensure they are tight. Verify that the fuel tank has fresh gasoline and that the fuel valve is open. Inspect the spark plug for wear and replace if necessary. Ensure that the parking brake is engaged and the mower deck is disengaged before starting.
First, disconnect the spark plug wire to prevent accidental starts. Remove the mower deck and secure it in an upright position. Use a wrench to remove the blades, then sharpen them with a file or grinder. Balance the blades before reinstalling them to ensure smooth operation.
Clean the tractor thoroughly and remove any grass or debris. Change the oil and filter, and fill the fuel tank with fresh gasoline mixed with a fuel stabilizer. Disconnect the battery and store it in a cool, dry place. Cover the tractor and store it in a dry, sheltered area.
Park the tractor on a level surface and disconnect the spark plug wire. Remove the mower deck and then the belt covers. Release the tension on the belt tensioner and remove the old belt. Install the new belt following the routing diagram found in the manual, and reassemble the deck and belt covers.
Ensure the engine cooling fins and air intake screen are clean and free of debris. Check the oil level and ensure it is correct. Verify that the engine is not overworked and that the cutting height is adjusted properly. If the problem persists, consult a professional technician.
Basic maintenance tasks, such as checking the oil and cleaning the mower deck, should be performed after every 10 hours of use. Comprehensive maintenance, including oil changes, air filter replacement, and blade sharpening, should be done at least once per season or every 50 hours of use.
Uneven cutting may be caused by improperly inflated tires, a bent blade, or a misaligned mower deck. Check tire pressure, inspect the blades for damage, and ensure the deck is level. Adjust the deck height and alignment according to the instructions in the manual.
Adjust the cutting height by moving the lever on the side of the mower deck to the desired position. Ensure both sides of the deck are set to the same height for an even cut. Consult the owner's manual for recommended cutting heights for different grass types.
Excessive vibration may be caused by unbalanced blades or a damaged drive belt. Check the blades for balance and sharpen or replace them as necessary. Inspect the drive belt for wear or damage and replace it if needed. Tighten any loose components on the tractor.