11 · Lawn & Garden

Lawn Mower

Also called Mower · Walk-behind mower · High-wheel mower

A walk-behind mower that cuts grass to an even height for healthy, tidy lawns and grounds.

Petrol engine
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Overview

A walk-behind mower cuts grass to one even height, which is what keeps a lawn thick: cutting regularly makes the grass put out new shoots instead of running to seed.

Ours are petrol walk-behinds. High-wheel models roll through long or rough grass where a standard mower bogs down, and a collector takes the clippings for a tidy finish. Residential lawns and yards, parks and grounds maintenance are the usual jobs.

Never take more than a third of the grass height in one cut. More than that stresses the lawn and leaves it yellow, and on long grass it means two passes a few days apart rather than one.

Walk the area first and clear sticks and stones. On a slope, mow across it and never up and down.

Best uses

  • Residential lawns and yards
  • Parks and grounds maintenance
  • Long or rough grass (high-wheel models)
  • Collecting clippings for a tidy finish

Troubleshooting

Uneven cut or scalping

Checks to try, in order

  1. Set every wheel to the same cutting height.
  2. Slow down — walking too fast leaves uncut strips.
  3. A blunt blade tears the grass instead of cutting it.

Reference draft — always follow the manufacturer’s manual.

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Mower suddenly vibrates heavily

Checks to try, in order

  1. Stop the engine immediately and pull the spark plug cap off.
  2. Tip it (air filter side up) and look for a bent or damaged blade.

A bent blade or shaft must be repaired before the mower is used again.

Reference draft — always follow the manufacturer’s manual.

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Grass isn't collecting in the bag

Checks to try, in order

  1. Empty the bag — a full bag stops collecting.
  2. Wait for wet grass to dry; wet clippings clog the chute.

Reference draft — always follow the manufacturer’s manual.

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Engine won't startShared · Petrol engine

Likely causes

  • Fuel valve or switch off
  • Stale fuel
  • Low oil sensor
  • Choke position
  • Spark plug cap loose

Checks to try, in order

  1. Turn the fuel valve ON and the engine switch to ON.
  2. Cold engine: close the choke. Warm engine: leave the choke open.
  3. Check there is fresh petrol in the tank — stale or water-contaminated fuel is the most common cause.
  4. Check the engine oil. Many engines have a low-oil shutdown that stops them starting when oil is low or the machine is on a slope — top up and set the machine on level ground.
  5. Make sure the spark plug cap is pushed fully onto the plug.
  6. Pull the starter rope with a smooth, firm pull — don't let it snap back.

If the starter rope is locked or unusually hard to pull, stop — don't force it. Tag the unit and return it to the workshop.

Reference draft — always follow the manufacturer’s manual.

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Starts, then stalls or runs roughShared · Petrol engine

Likely causes

  • Choke left on
  • Blocked air filter
  • Low fuel
  • Low-oil shutdown

Checks to try, in order

  1. Open the choke gradually once the engine has warmed up.
  2. Check the fuel level and that the fuel cap vent isn't blocked.
  3. Check the air filter — a dusty filter chokes the engine. Tap it out or swap it.
  4. Check the oil level again; the low-oil sensor can cut the engine on uneven ground.

Reference draft — always follow the manufacturer’s manual.

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Smell of fuel or a visible leakShared · Petrol engine

Checks to try, in order

  1. Switch the engine off immediately and move away any ignition sources.
  2. Turn the fuel valve OFF.
  3. Check the fuel cap is seated and look for a wet fuel line or carburettor bowl.

Don't run a machine that is leaking fuel. Tag it out and report it.

Reference draft — always follow the manufacturer’s manual.

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Safety

  • Pull the spark plug cap off before touching the blade.
  • Never pull the mower backwards toward your feet.

For petrol engine

  • Refuel only with the engine off and cool. No smoking or open flames nearby.
  • Exhaust contains carbon monoxide — never run it indoors, in trenches or in enclosed spaces without ventilation.
  • Wear hearing protection, safety glasses and safety boots.

Videos & links

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