Simplicity 990598 Yeoman 627 Parts Manual
![Simplicity 990598 Yeoman 627 Tractor manual cover](/images/BJQjdGXTBFmSHMPBftuiSDyL/thumbs/thumb175x175.webp)
To change the oil, first ensure the tractor is on a level surface and the engine is cool. Remove the oil drain plug and let the old oil drain completely. Replace the drain plug and refill with the recommended oil type and quantity as per the manual.
Check the battery connections for corrosion or looseness. Ensure the fuel tank is not empty and the fuel is fresh. Inspect the spark plug for wear or damage and replace if necessary. Finally, check the safety switches and ensure they are engaged properly.
Regular maintenance should be carried out every 50 hours of operation or at the start of each season. This includes checking the oil, air filter, spark plug, and tire pressure. Refer to the user manual for a detailed maintenance schedule.
To adjust the cutting deck, park the tractor on a flat surface. Adjust the deck height lever to the desired cutting height. Check the deck level from side to side and front to back using a level, and adjust using the deck leveling screws if necessary.
Uneven cutting can be caused by an unlevel cutting deck, dull blades, or incorrect tire pressure. Ensure the deck is level, sharpen or replace the blades, and check all tires for even pressure.
Start by checking the battery for charge and connections. Inspect all fuses and replace any that are blown. Look for damaged wires or loose connections. Use a multimeter to test the ignition switch and starter solenoid.
Use unleaded gasoline with an octane rating of 87 or higher. Avoid using gasoline with more than 10% ethanol to prevent engine damage.
Clean the tractor thoroughly to remove dirt and debris. Drain the fuel or add a fuel stabilizer to prevent gumming. Remove the battery and store it in a cool, dry place. Cover the tractor to protect it from dust and moisture.
To improve traction, consider using tire chains or adding wheel weights. Ensure tires are properly inflated and in good condition. When operating on slopes, always drive up and down rather than across to prevent tipping.
Excessive vibration can be caused by unbalanced or damaged blades, loose bolts, or worn belts. Inspect and balance or replace the blades, tighten any loose components, and check the condition of the belts.