Lawn mowers are tough machines, but they will give some subtle and not so subtle hints they need attention.

After a winter hiatus, it is not uncommon for mowers to have trouble starting or to make unsettling noises and behave erratically. All are signs that the mower is not in tip-top shape.

Look for these warning signals to determine if your lawn mower is in need of professional attention:

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Getting yanked around. A lawn mower with a starter cord should start in less than 10 pulls. If it takes more to get the engine to fire, then the mower should be serviced. Continuously yanking the cord to get the engine to start will not only lead to extreme frustration, but it could also cause the cord to break.•

Sp-sp-sputtering Problems. Sputtering engines indicate the mower’s engine is not receiving the correct blend of air and fuel. This is usually the result of a dirty air filter and carburetor. To help prevent this, regularly brush off the exterior of the machine, and also clean the mower’s air filter every three to five uses.•

Knock, Knock. When an engine makes a knocking noise, it is no laughing matter. This noise can be an indication that the engine needs more oil or is running hot.•

The Big Bang Theory. Banging noises coming from under the lawn mower usually indicate a problem with the mower’s blade. When the blade hits large rocks, roots or other debris, it can become bent or out of balance, causing it to strike the mower’s deck. All banging noises should be investigated.•

Smoke Signals. If the lawn mower is producing puffs of black or blue smoke, it is trying to tell you something. Black smoke is a sign the mower’s carburetor is running rich and is burning too much gas. Blue smoke means the mower is burning too much oil. Mowers that are operating properly should not produce any smoke.•

Going Nowhere Fast. Self-propelled lawn mowers are designed to make mowing the lawn easier, but when the propulsion system is malfunctioning, it can make mowing very difficult. A problem with the mower’s self-propel feature is often a sign the transmission is worn or needs an adjustment.Although infrequently operated, rarely cleaned and normally subjected to the harshest of conditions, lawn mowers can last for years if cared for properly. All mowers should be serviced at least once a year, whether they are operated year round or only during the peak mowing season.