Troubleshooting Push Mowers

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Troubleshooting Push Mowers

Troubleshooting Push Mowers

Trouble

Possible Causes

Corrective actions

Unit will not start

Control handle is not engaged

Engage control handle

Spark plug wire is disconnected

Connect spark plug wire

Fuel tank empty or stale fuel

Replace with clean, fresh gas

Blocked fuel line

Clean fuel line

Faulty spark plug

Replace, clean, or adjust gap

Engine flooded

Wait to restart, do not prime

Air filter filled with dirt or debris

Replace or clean air filter

Engine runs erratic

Spark plug wire loose

Connect and tighten spark plug wire

Blocked fuel line or stale fuel

Clean fuel line
Fill tank with fresh clean gasoline

Vent in gas cap is plugged

Clear vent

Water or dirt in fuel system

Drain fuel tank
Refill with fresh fuel.

Carburetor is out of adjustment

Adjust carburetor
(refer to engine manual)

Engine is overfilled with oil

Drain oil and fill to proper amount.

Engine idles poorly

Spark plug is fouled, faulty or gap is too wide

Replace spark plug or reset gap to proper setting.

Dirty air filter

Clean or replace air filter.

Carburetor is adjusted improperly

Adjust carburetor.

Excessive vibration

Blade is loose or unbalanced

Tighten blade and adapter. Balance blade.

Bent blade

Replace blade.

Engine mounting bolt loose or missing.

Tighten or replace bolt.

Uneven cut

Wheels are not positioned correctly.

Place all four wheels in same height position.

Dull or bent blade

Sharpen or replace blade.

Mower mulches grass poorly

Wet grass.

Do not mow wet grass, wait until grass is dry.

Excessively high grass

Mow once at high cutting height then at desired height. Make a narrower cutting swath.

Engine is not running at full throttle (RPMs are low)

Make sure throttle is at full throttle.

Dull blade.

Sharpen or replace blade.

Mower bags grass poorly

Wet grass.

Do not mow wet grass, wait until grass is dry.

Chute is plugged.

Clean chute.

Engine is not running at full throttle (RPMs are low)

Make sure throttle is at full throttle.

Dull blade.

Sharpen or replace blade.

Handle height is too low/high

Handle height is not adjusted properly

Adjust handle height

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Lawn Mower Parts - Quality Outdoor Power Equipment Parts for MTD Mowers, Lawn Equipment & More