The last aeration pass of the fall is done, and the machine is about to sit for six months. That’s exactly when aerators die — not from use, but from being parked dirty, wet, and tensioned, so winter can rust the tines, rot the belts, and seize the bearings. An hour of end-of-season care is the difference between an aerator that pulls clean plugs next fall and one that needs a rebuild.
Whether it’s a tow-behind like the Agri-Fab 45-0299 or the Brinly 40-inch, a walk-behind, or a rental you borrowed, the winterizing routine is the same.
Step 1: Clean it like you mean it
Never store dirty tines. Wash the whole machine, and clean the tines with high-pressure water while they’re still clamped in their holders — dried clay in the tine sockets is how tines snap next season. Then remove the tines and inspect them: tines worn down an inch should be replaced even if they still cut soil, and every tine bolt should be snug (on towable units, the tine-reel nut torque spec is 100 ft-lbs per the Billy Goat parts guide).
Still-usable tines get coated with oil and stored in a plastic bag for the winter — that’s straight from John Deere’s aerator storage procedure. Brinly’s own use-and-care guidance says the same for the tow-behinds most homeowners own: pry the tine tabs open to swap damaged tines, clear debris from between tines, and apply a light coat of oil after use to prevent rust.
Step 2: Relieve the tension
Belts left tensioned all winter take a set and crack. John Deere’s checklist calls for loosening belt tension before storage, checking the belt drives for wear, and replacing anything frayed now — when parts are cheap and in stock — rather than in April when everyone needs them.
While you’re under there: coat the drive chain with non-detergent SAE 30 oil (clean it with a chain degreaser first if it’s gunked), and repack the cam, shaft, and wheel bearings with fresh lithium grease wherever you can’t see clean grease. Walk-behind owners should check tire pressure against the sidewall — roughly 8.5 psi on many units — since flat-spotted tires are a spring headache.
Step 3: Winterize the engine (gas units) or battery (electric)
For gas-powered aerators, the standard small-engine winterization applies: change the engine oil and filter, clean or re-gap the spark plugs, run the carburetor dry or dose the fuel with stabilizer, and spray a preservative on tires, belts, and hoses.
Battery-powered units get simpler treatment with one critical step: remove the battery, clean the contacts, and keep it on a trickle charger in a spot that stays above freezing. A lithium or lead-acid battery left to freeze and self-discharge all winter is a spring purchase you didn’t need to make.
Step 4: Store it right
Inside beats outside, always. The machine should live in a dry area with a firm, level surface. If it has to live outdoors, use a proper waterproof cover — a tarp draped over it traps condensation and makes the rust problem worse, not better. Store it with the tines up or removed so the weight isn’t sitting on them, and check moving parts one last time: lubricate anything that pivots before you walk away.
One more, from experience-shaped advice: park it where mice can’t make a condo of the engine shroud. A $3 bag of steel wool in the exhaust opening saves a $200 carburetor cleaning.
Spring recommissioning (write this on the cover)
Tape a note to the machine so April-you remembers: re-tension the belts, lubricate the powershaft, change the gearbox oil, and test on practice turf first. John Deere’s procedure is explicit that new tines must be broken in on practice turf before real use — and on the first run, listen for unusual mechanical noises before they become expensive ones.
Bottom line
Wash it, oil the tines, loosen the belts, grease the bearings, pull the battery, and store it dry and covered. That’s the whole winterizing routine — an hour now against a rebuild later. Thinking about whether to own or rent in the first place? Our rent vs. buy breakdown runs the math, and if you’re pairing the aeration with soil feeding, topdressing right after aerating is the follow-up that makes the whole pass pay off.