Simplicity 990763 Yeoman 637 Parts Manual

To change the oil, first, warm up the engine to ensure the oil flows easily. Turn off the engine and place a drain pan under the oil plug. Remove the plug and let the oil drain completely. Replace the plug, remove the oil filter, and install a new one. Finally, refill with the recommended oil type and quantity.

If the tractor won't start, check the battery connections for corrosion and ensure they are tight. Verify that the fuel tank has enough gasoline and that the fuel valve is open. Inspect the spark plug for wear or damage, and replace if necessary. Check the safety switches and ensure they are engaged properly.

Uneven cutting can be caused by a misaligned mower deck. Check that the deck is level and adjust as needed. Also, inspect the blades for sharpness and balance; sharpen or replace them if necessary. Ensure that the tires are inflated to the recommended pressure.

Before storing the tractor, clean it thoroughly and remove any grass clippings or debris. Change the oil and replace the oil filter. Add a fuel stabilizer to the gas tank to prevent fuel degradation. Disconnect the battery and store it in a cool, dry place. Inflate the tires to the recommended pressure.

To adjust the mower deck height, locate the height adjustment lever usually found on the right side of the tractor. Move the lever to the desired cutting position, ensuring it clicks into place. Verify the deck height by measuring from the ground to the blade tips.

Engine overheating can result from insufficient coolant levels, a blocked air intake, or a faulty radiator. Check the coolant level and top it up if necessary. Clean any debris from the air intake and radiator fins. If the problem persists, inspect the thermostat and water pump for issues.

The Simplicity 990763 Yeoman 637 Tractor is designed to run on unleaded gasoline with an octane rating of at least 87. Avoid using ethanol blends higher than 10% to prevent engine damage.

The air filter should be inspected and cleaned every 25 hours of operation and replaced every 100 hours or annually, whichever comes first. Replace the air filter more frequently if operating in dusty conditions.

If the transmission is slipping, check the transmission fluid level and fill it to the recommended level if low. Inspect the belts for wear or damage and replace if necessary. Also, ensure that the linkages are properly adjusted and not binding.

To replace the drive belt, first disconnect the battery for safety. Remove the mower deck for easier access. Release the tension from the belt by adjusting the idler pulley and remove the old belt. Install the new belt according to the routing diagram, re-tension the belt, and reassemble the mower deck.