Tow-Behind Aerator Problems: 9 Common Issues and How to Fix Them

Last updated: October 2026 · Written by the LawnVibe editorial team.

Tow-behind aerators are simple machines: a frame, a tine shaft, a weight tray, two wheels and a hitch. That simplicity means most problems are easy to diagnose and fix at home. This guide works through the most common tow behind aerator problems, from shallow cores and bouncing to stuck transport levers, wobbly wheels and hitch trouble, with clear steps for each.

For setup and technique, see our guide on how to use a tow-behind aerator.

How a tow-behind aerator works

Understanding the parts makes troubleshooting faster:

• Hitch and tongue connect the aerator to the mower and keep it level.
• Frame holds everything together and carries the weight tray.
• Weight tray holds the load that pushes tines into the soil.
• Tine shaft carries the tines, spoons or spikes, usually on plates or wheels spaced along it.
• Bearings let the shaft and wheels turn smoothly.
• Transport lever or wheels raise the tines off the ground for driving and turning, and lower them for aerating.
• Wheels and tires carry the aerator during transport and sometimes help set depth.

When the aerator is towed with tines down, the shaft rolls along the ground and the weight drives each tine into the soil as it rotates. Problems usually come from one of these parts not doing its job.

Safety before troubleshooting

• Turn off the mower, remove the key and set the parking brake.
• Remove weights from the tray before inspecting or lifting the aerator.
• Support the frame securely on stands or blocks before working underneath.
• Wear gloves; tines and spoons have sharp edges.

Tow-behind aerator problems: quick diagnosis

1. Shallow cores or no cores

This is the most common complaint. Work through the causes in order:

1. Soil moisture. Dry soil stops tines short. Water about an inch and wait a day.
2. Weight. Add weight to the tray within the manufacturer's limit.
3. Speed. Drive slower, in a lower gear.
4. Tine condition. Worn, bent or dull tines core poorly. See how to replace aerator tines.
5. Transport lever. Make sure tines are fully lowered.

For more, see our guide on aerator not penetrating soil.

If cores are short only in some areas, those spots are probably drier, more compacted or rockier than the rest. Give them a second pass after watering.

2. The aerator bounces

Bouncing means tines are riding over the surface instead of entering it.

• Slow down; speed is the main cause.
• Add weight evenly across the tray.
• Level the hitch so the aerator is not tipped forward or back.
• Check tire pressure on pneumatic models; overinflated tires bounce more.

3. Tines not turning

A stalled shaft is easy to miss from the driver's seat, so glance back every few passes to check that tines are rotating and cores are landing behind the aerator.

If the tine shaft stops rotating, the aerator just drags across the lawn.

• Check for sticks, rope, wire or grass wrapped around the shaft.
• Clear packed soil between tine plates.
• Spin the shaft by hand with the aerator raised. If it is stiff or grinds, the shaft bearings may need cleaning, lubrication or replacement.

4. Transport lever stuck

A stuck lever is not just inconvenient. If you cannot raise the tines, you cannot turn or cross hard surfaces without damage.

• Remove weights; a heavy load makes the lever hard to move.
• Clean dirt and rust from the pivot points and linkage.
• Lubricate pivots as the manual recommends.
• Check for bent linkage rods or brackets and straighten or replace them.

5. Wobbly or noisy wheels

Wheel problems tend to get worse quickly once they start, so deal with them early.

• Inflate pneumatic tires to the pressure on the sidewall.
• Tighten axle nuts and bolts.
• Check wheel bearings for play. Worn bearings cause wobble and grinding; replace them.
• Grease bearings if the manual calls for it.

Do not run an aerator with a noisy, grinding bearing for long. A failing bearing can seize and damage the axle or shaft, turning a simple repair into a much bigger one.

6. Bent shaft, tines or plates

Hitting rocks, roots or curbs can bend tines, spoons or the shaft itself. Inspect after any hard impact. Straighten slightly bent tines carefully; replace sharply bent tines and bent shafts, since a bent shaft makes the aerator wobble and core unevenly.

7. Hitch problems

Hitch issues are a safety concern, not just a nuisance.

• Use the correct hitch pin size and always install the retaining clip.
• Check the tongue and hitch plate for elongated or cracked holes.
• Make sure the hitch height keeps the aerator level.
• Replace worn hitch hardware rather than risking the aerator coming loose.

A rattling hitch is also a warning sign. Excess play lets the aerator jerk on every bump, which wears the hitch holes faster and can loosen the pin.

8. Uneven coverage

• Center the weight in the tray.
• Equalize tire pressure.
• Replace bent or missing tines on one side.
• Overlap passes slightly so you do not leave untreated strips.

Uneven coverage can also come from driving pattern rather than the aerator. Use a fixed reference point at the far end of each row and keep a consistent overlap, and the coverage will even out.

9. Mower struggling to pull

• Reduce weight, especially on slopes or soft ground.
• Avoid aerating wet, slippery turf.
• Check that the mower's tires are inflated correctly.
• Confirm the mower's towing capacity in its manual.

Problems with spike-style tow-behind aerators

Tow-behind spike aerators have their own quirks.

• Spikes not penetrating: spike units rely heavily on weight and moisture. Water the lawn, load the tray and slow down. Remember that even when working well, spikes do less for compaction than plug tines.
• Spikes bending: solid spikes bend easily on rocks. Inspect after each use and straighten or replace them.
• Turf tearing: spike drums that do not lift for turns can scuff the lawn. Make wide turns, or raise the unit if it has a transport position.

If your lawn is compacted, consider switching to a plug-style tow-behind aerator. Our guide on how to use a spike aerator explains where spike units fit.

Problems with combination aerator-spreaders

Some tow-behind units include a hopper for seed or fertilizer.

• Material not flowing: check for clumped product or a blocked opening, and make sure the hopper gate is open.
• Uneven spreading: calibrate the rate setting for the product and keep a steady speed.
• Corrosion: fertilizer is corrosive; empty and rinse the hopper after every use and let it dry.

Problems after a hard impact

If the aerator hits a curb, large rock or stump, stop and inspect it before continuing. Look for bent tines or spoons, a shaft that no longer turns true, cracked welds on the frame or tongue, and damaged wheel rims. Spin the shaft by hand with the unit raised and watch for wobble. Continuing to tow a damaged aerator can bend parts further and damage the mower's hitch.

Preventive maintenance routine

Most of these problems can be prevented with a simple routine.

Before each use:

• Check tine condition and remove any wrapped debris.
• Check tire pressure on pneumatic models.
• Test the transport lever through its full range.
• Inspect the hitch pin, clip and tongue.

After each use:

• Raise the tines, remove weights and park on a hard surface.
• Scrape soil from the tines, shaft and wheels.
• Rinse with a hose if needed and let the unit dry.
• Look for bent parts and loose hardware.

Each season:

• Lubricate wheel bearings, shaft bearings and lever pivots as the manual specifies.
• Tighten all bolts and nuts.
• Touch up paint on scratched areas to prevent rust.
• Replace worn tines as a set.

For cleaning and storage details, see our guide on cleaning and storing a lawn aerator.

Keeping a simple repair kit

A few supplies cover most tow-behind repairs in the field:

• Spare hitch pins and retaining clips in the right sizes
• A wrench set and socket set
• A tire pressure gauge and a small pump for pneumatic tires
• Grease or oil for bearings and pivots
• Spare tines or spoons, if your model uses replaceable ones
• A stiff brush and scraper for packed soil
• Zip ties and wire for temporary fixes

Storage problems that cause trouble next season

Many problems start during storage. Leaving weights in the tray strains the frame and bearings. Storing the aerator outside uncovered lets rust seize the transport lever and bearings. Leaving soil packed around the tines causes rust and stiffness. Storing on damp ground flattens and rots tires. Before putting the aerator away, remove the weights, clean it, lubricate moving parts and store it under cover, off the ground if possible.

Repair or replace?

Tow-behind aerators are inexpensive compared with many lawn machines, so weigh repair costs against a new unit. Replacing tines, bearings, tires and hitch hardware is usually worthwhile. A cracked frame, a badly bent main shaft or rust that has weakened the structure often means replacement makes more sense. If you are shopping, our roundup of the best riding lawn aerator compares riding and tow-behind options for large lawns.

University extension services, such as Penn State Extension, offer guidance on aeration timing and soil moisture for effective coring.

The bottom line

Most tow behind aerator problems come down to soil moisture, weight, speed, tine condition and simple mechanical wear. Water dry soil, add weight within the limit, slow down and replace worn tines for better cores. Clear jams, lubricate bearings and lever pivots, tighten wheels and hitch hardware and replace bent parts. A quick inspection before and after each use keeps a tow-behind aerator working for many seasons.

Frequently Asked Questions