Simplicity 1691825 GTH Parts Manual

Ensure the parking brake is engaged, the PTO is disengaged, and the throttle lever is set to 'fast'. Turn the ignition key to the 'start' position and release it once the engine starts.
Check the fuel level, battery connections, and ensure the PTO is disengaged. Verify that the spark plug is in good condition and that the air filter is clean.
Change the engine oil after every 50 hours of operation or at least once per season. Always consult the owner's manual for specific oil type and capacity.
The recommended tire pressure is typically around 10 PSI for the rear tires and 14 PSI for the front tires, but always refer to the specifications in the owner's manual.
Check the mower deck for levelness and ensure the blades are sharp and properly installed. Inspect for obstructions or debris that may be causing uneven cutting.
Clean the tractor thoroughly, change the oil, add a fuel stabilizer, and store the battery in a cool, dry place. Cover the tractor to protect it from dust and moisture.
Use the height adjustment lever located near the operator's seat to set the desired cutting height. Ensure the mower deck is level before adjusting the height.
Regular maintenance includes checking the oil level, inspecting and cleaning the air filter, sharpening blades, lubricating pivot points, and checking tire pressure.
First, disconnect the spark plug and remove the mower deck. Release the tension on the belt and remove it from the pulleys. Install the new belt and reassemble the tractor.
Check for loose or damaged blades, ensure all bolts and nuts are tightened, and inspect the belts for wear or damage. Balancing the blades may also help reduce vibration.