Lawn mower

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Machine types

Cylinder mower

These cut neatest, producing a striped lawn. They use less energy than rotaries for a given job. But they don't tolerate rough ground, can't cut long weeds, and the blade arrangement does need maintenance now & then.

Rotary mower

More capable all round, light mowers can be lowered onto large weeds, and at a push can even gradually level lumpy ground. The blade can work without maintenance if it must. Stone tolerant to some extent. But results aren't as neat & tidy.

Hover

Easier to move around obstacles. Easier to use on steep banks. Prone to grounding on peaks. Troughs in the ground also cause grounding. The resulting patches of low cut are noticeable on uneven ground.

Scythe

Effective for clearing overgrown areas - a long handled scythe can clear faster than power tools. Correct technique takes a little practice. Obvious injury potential.

Allen scythe

aka Power scythe, introduced in 1935. A petrol powered hedge trimmer on 2 large wheels, good for clearing overgrown land.

Strimmer

Good for edging, much too slow for lawn mowing

Shears

No-one in their right mind would spend days cutting a lawn with shears - but I've seen it done.

Propulsion

Small tractor

Used with gang mowers for the largest areas.

Ride-on

The only good option for large lawns. Top speed varies fairly widely, and can make a big difference.

Self propelled

Good choice for the average lawn

Non propelled

Wheel size, weight & handle angle determine how much work they are to push. Rollers sink into dips much less than wheels. Fine for small to medium lawns if your health is ok.

Push mower

Some folk like the exercise of a non-powered mower. If you've not tried one the average lawn is fairly demanding, and cutting it in one go is well beyond someone that doesn't get regular exercise.

Cordless

Robot

Blade types

IMAG1405-3 mower blade.jpg

Rotary mowers come with 2 main blade types:

Metal blade:

  • Keeps on cutting, given an occasional sharpen
  • Can cut through thick weeds in limited numbers, level molehills etc
  • Serious foot injury potential

Plastic blades:

  • Need regular replacement
  • Muck on the blade holder stubs can cause them to come off frequently
  • Less effective than metal blades, generally
  • Don't cut tough weeds
  • Relatively toe safe
  • If they keep coming off, try shorter blades


Electrical connectors

IMAG1404-3 mower connector.jpg
  • Always use a connector with the same number of pins as the flex has cores
  • NEVER fit a connector with pins on the mains plug side, or you'll have live pins sticking out. Its always socket with holes nearest the mains plug, plug with pins nearest the motor
  • If the connector has a cover you have to thread the flex through, don't forget to put the cover on first!
  • Some have assymetric cord grips that can be turned the other way up to take thicker or thinner flex
  • There are a few different patterns of mower connectors available - needless to say none is compatible with other types.

Electric vs petrol

Electric:

  • Lower power generally
  • Lead gets in way
  • Risk of chopping lead
  • Limited range
  • Not advisable to use on wet lawn
  • Cheaper
  • Near zero maintenance

Petrol:

  • Free from the limitations of electric power
  • Greater maintenance & reliability issues


Maintenance

A quick overview of the main maintenance requirements. Individual models may have additional requirements.

Cylinder

Sharpen & align annually.

Rotary

Sharpen annually, grinding the upper blade side only to create an updraught of air.

Electric

Keep air paths clear, best checked after every mowing session. Inspect flex frequently.

Petrol

Plenty to maintain on these, more a subject for another article.

Steel deck

Clear accumulated grass frequently, preferably after each use. Clean well annually, and paint any bare patches to prevent deck failure.


It won't start

Fault diagnosis is a wide & complex topic, but the following homes in on the majority of faults.

In most cases the problem is either with fuel or spark. Test for presence of spark with a neon in series with the spark plug lead - keeping yourself well away from the very high voltage. Test for fuel problems by spraying easystart or similar into the air intake and trying to start it.


Historic mowers

There are still some 1950s mowers giving good service. Atco is one of the longest lasting brands. The one thing to beware of is uninsulated sparkplug connections - touching one is not a mistake you'll make a 2nd time!


Safety

The main issues are

  • Foot injury from metal blades can be severe
  • Electrical connectors on wet grass - don't mow when wet
  • Blade cutting electrical lead
  • CO output from exhaust in a shed/barn. CO can be lethal
  • Exposed high voltage on spark plugs with historic mowers


Repair Links

Reviews

MTD Lawnflite 703 ride-on. Also see [1]


Disposal

There are always people wanting working petrol engines


See Also