Replacing the Drive Belt on a New Holland 479 Haybine: Step-by-Step Guide

Time: ~15 minutes. Tools: Safety glasses, adjustable wrench, socket set, flathead screwdriver.

1. Disconnect Battery (prevent accidental start).
2. Remove Right Rear Belt Guard: Unscrew two plastic nuts with flathead; lift off guard.
3. Loosen Tensioner Bolt: Locate tensioner pulley (bottom); loosen bolt with adjustable wrench to release belt tension.
4. Remove Old Belt: Pull off pulleys starting with tensioner.
5. Install New Belt: Route onto pulleys in same direction as old belt; start at tensioner.
6. Tension Belt: Tighten tensioner bolt until ~½ inch (12 mm) play in belt.
7. Check Alignment: Ensure belt sits centered on all pulleys; adjust if needed.
8. Reattach Belt Guard: Secure with plastic nuts.
9. Reconnect Battery.
10. Test: Start engine, engage PTO. Listen for noise/vibration. If smooth, done.

Always consult your specific model's service manual for torque specs and diagrams.