Lawn Mower Repair: What Breaks, When to Fix It, When to Replace It

Lawn mowers wear in stages. Blades dull. Deck corrodes. Transmission fails. Here's the repair path and when to buy new.

Three Stages

Stage 1: Blade Wear (Years 1-3) - Blade dulls. Won't cut cleanly. Sharpen ($15-25) or replace ($20-40). Dull blades increase engine wear.

Stage 2: Deck/Transmission Wear (Years 3-7) - Deck rusts. Transmission has metal shavings. Belt wears. Paint deck ($30-50). Change transmission oil ($40-60). Replace belt ($80-120).

Stage 3: Major Failure (Years 7+) - Transmission fails. Engine loses compression. Deck has holes. Repair exceeds replacement cost.

Blade Sharpening

Every 20-30 hours, sharpen blades. Can sharpen 3-4 times before replacement. Sharpening: $15-25. Replacement: $20-40. Dull sign: Grass looks torn, not cleanly cut.

Deck Maintenance

Grass sticks and rusts underneath. Every season: scrape clean, wash, dry, apply light oil or paint. If rust spots appear: scrape with wire brush, paint over. If deep holes, deck needs replacement ($300-600).

Engine Maintenance

Change oil every 50 hours ($15-25). Replace spark plug every 100 hours ($5-15). Replace air filter every 1-2 years ($15-30).

Transmission Maintenance (Riding Mowers)

Change fluid and filter every 100 hours or annually ($40-60). Old fluid loses lubrication. Transmission fails. New transmission: $800-1500. If grinding, drain immediately. Technician inspects. Caught early, fluid change saves it.

Repair vs Replace

Repair if: Less than 7 years old AND repair cost less than 50% of new mower. Replace if: Older than 10 years OR repair more than 50% of new price OR deck has structural damage. New push: $300-600. New riding: $2000-5000.

Call to schedule seasonal maintenance.

About the Author

Henry Bockman maintained hundreds of lawn mowers. He knows when to service and when they're beyond saving.