Lawn Care
Recycling Lawn Mower Parts: Gas, Battery, and Metal Disposal
Assessing Your Mower: Repair, Donate, or Scrap?
When a lawn mower reaches the end of its operational life, simply dragging it to the curb for municipal trash pickup is both environmentally hazardous and financially wasteful. Properly recycling lawn mower components requires a systematic approach to handling household hazardous waste (HHW), lithium-ion fire risks, and ferrous versus non-ferrous metals. Before you begin dismantling, evaluate the machine's condition to determine the most profitable and responsible disposal route.
| Mower Condition | Best Action | Expected Value / Cost | Time Investment |
|---|---|---|---|
| Engine runs, deck is rusted | Donate to Habitat ReStore or local vocational school | Tax deduction ($50-$150) | 15 minutes (transport) |
| Engine seized, metal deck intact | Dismantle and scrap metals separately | $15 - $40 in scrap value | 1 - 2 hours |
| Cordless Li-Ion, battery degraded | Recycle battery, scrap bare tool | $10 core charge, $12 scrap | 45 minutes |
| Plastic deck, broken transmission | Take to municipal HHW facility | Free (or $10 disposal fee) | 30 minutes (transport) |
Step 1: Safely Draining and Disposing of Fluids
Scrap yards and municipal recycling centers will immediately reject a mower if it contains gasoline or motor oil. Furthermore, pouring these fluids down storm drains or into the soil is a severe environmental violation; according to the EPA, just one gallon of used oil can contaminate one million gallons of fresh water.
Draining the Gasoline
Do not rely on running the carburetor dry, as this leaves residual varnish and fuel in the tank. Instead, use a manual liquid siphon pump (available for $8 to $12 at hardware stores) to extract the gas into an approved red plastic fuel container. If the gas is less than six months old and hasn't separated, it can be diluted into your vehicle's fuel tank at a ratio of 1:10. If it is stale or contaminated with water, it must be taken to a local hazardous waste drop-off site. You can locate your nearest facility using the Earth911 recycling locator.
Extracting the Motor Oil
Most push mower engines (like the ubiquitous Honda GCV160 or Briggs & Stratton 625 series) hold between 15 and 20 ounces of SAE 30 or 10W-30 oil. Tip the mower carefully onto its side with the air filter and carburetor facing up to prevent oil from flooding the intake and ruining the filter. Drain the oil into a translucent catch pan. Crucial Gotcha: Auto parts retailers like AutoZone, O'Reilly, and Advance Auto Parts will accept up to five gallons of used motor oil for free, but they will test it for water and gasoline contamination. If your oil is mixed with gas, they will refuse it, forcing you to take it to a county HHW center.
Step 2: Handling Mower Batteries (Li-Ion vs. Lead-Acid)
The rise of high-voltage cordless mowers (ranging from 40V to 82V platforms by brands like EGO, Toro, and Ryobi) has made battery disposal a critical safety issue. Lithium-ion batteries cannot be placed in municipal trash or standard recycling bins due to the risk of thermal runaway, which causes catastrophic fires in garbage trucks and sorting facilities.
High-Voltage Lithium-Ion Batteries (Cordless Mowers)
If your 56V or 60V lithium-ion battery no longer holds a charge, it must be recycled through specialized e-waste channels. Before transport, you must tape the battery terminals with electrical or duct tape to prevent short-circuiting if the terminals brush against metal in your vehicle. Use the Call2Recycle locator to find drop-off points at participating Home Depot, Lowe's, or Best Buy stores. Note that while some retailers accept small power-tool batteries, large 56V+ lawn mower batteries (weighing 5 to 10 lbs) are sometimes rejected at standard retail kiosks. In these cases, a dedicated county e-waste facility is your only legal option.
12V Lead-Acid Batteries (Riding Mowers & Tractors)
Riding mowers typically use a 12V U1 or Group 26 lead-acid battery. These are highly recyclable, with nearly 99% of their lead and plastic being recovered. When you purchase a replacement battery, retailers charge a $10 to $15 "core deposit." Returning your dead lead-acid battery to the point of purchase reclaims this deposit. Never attempt to drain the sulfuric acid from these batteries yourself; the casings are recycled whole by the smelters.
Step 3: Dismantling and Scrapping the Metal Chassis
To maximize your payout at the scrap yard, you must separate ferrous metals (magnetic) from non-ferrous metals (non-magnetic). Scrap yards pay significantly more for clean aluminum than for mixed "shreddable" steel.
Tools Required for Dismantling
- 1/2-inch drive breaker bar or cordless impact wrench
- Sockets: 13mm, 14mm, 15mm, and 1/2-inch (depending on the manufacturer)
- Heavy leather work gloves and safety glasses
- A strong magnet (to sort metals at the scrap yard)
Separating the Components
1. Remove the Blade: Block the deck with a 2x4 piece of wood to stop the blade from spinning. Use a breaker bar to loosen the center bolt (usually 14mm or 15mm). The blade is hardened steel and falls under the "shreddable steel" or "heavy iron" category.
2. Remove the Engine Block: Unbolt the engine from the deck. Most modern mower engine blocks (including Honda, Kawasaki, and Briggs & Stratton) are cast aluminum to reduce weight. Cast aluminum is highly valuable (often $0.40 to $0.60 per pound in 2026 markets). However, you must remove the steel cylinder liner, the steel flywheel, and the plastic shrouds to classify it as "clean cast aluminum." If you leave the steel and plastic attached, the yard will downgrade the entire block to "dirty aluminum" or "shreddable," dropping the price to $0.10 per pound.
3. Sort the Deck: Most residential push mower decks are stamped steel (ferrous). Premium commercial mowers (like certain Exmark or Scag models) use fabricated or cast aluminum decks (non-ferrous). Test the deck with your magnet. Remove all plastic mulch plugs, rubber discharge chutes, and steel axles before weighing.
⚠️ Scrap Yard Warning: Many scrap yards use automated scales and will penalize you if they detect excessive "dirt weight" (rubber tires, plastic handles, and fluid residues). Cut off the rubber tires and leave them at a municipal tire recycling center, which usually charges a nominal $2 per tire fee. Arriving at the scrap yard with bare metal wheels ensures you get the pure metal weight price.
Frequently Asked Questions
Can I leave my old lawn mower at a local landfill?
Most modern municipal landfills strictly prohibit the dumping of small engines due to residual oil, gas, and lithium-ion fire risks. You must drain all fluids and remove the battery before a landfill will accept the bare metal chassis, and even then, many require you to route it through their designated metal recycling bins rather than the general trash compactor.
Is it worth scrapping a plastic-deck cordless mower?
Financially, no. Mowers with high-impact polymer decks (like the Ryobi 40V series) contain very little scrap metal—usually just the copper motor windings and the steel blade. The value of the extracted copper wire (about $1.50 to $2.00 per pound) rarely justifies the hour of labor required to cut open the plastic housing. It is better to donate these units to small-engine repair shops that harvest the copper and circuit boards for repairs.
How do I recycle the air filter and spark plugs?
Foam air filters saturated in oil must be thrown in the regular trash, as they are considered hazardous waste. Paper filters can be composted if they are dry. Spark plugs contain small amounts of precious metals but are too small to scrap individually; collect them in a jar and add them to your "clean aluminum" pile at the scrap yard, or dispose of them in standard household trash.
