How to Troubleshoot a Husqvarna Lawnmower

Check the fuel supply. An empty tank, stale fuel or water in the tank will keep the lawn mower from starting. Before starting the motor, ensure the fuel valve lever is turned "On."

Check the oil level, as too much oil in the engine may cause the machine to lose power.

Look for debris in the air filter. A blocked filter can keep the mower from starting or cause it to lose power when mowing.

Examine the spark plug and ensure it works and connects properly. Bad or loose spark plugs don't work, and the machine will not start.

Check the battery is fully charged and connected to the engine or the mower will not start.

Adjust the wheels so they are the same height and high enough off the ground that the undercarriage does not drag, otherwise the lawn length may be uneven or the mower may become difficult to push.

Examine the position of the cutting height lever, on the left side above the front wheel, if the grass is the wrong length. A low height setting will keep the mower from catching grass clippings.

Inspect the blade and the blade adapter. If they are loose, the machine will not start. A damaged or worn blade can make the starter rope hard to pull, cause uneven cuts, make the machine loose power or cause excessive vibration. If the lift on the blade has been worn off, the grass catcher will not fill properly. A buildup of clippings and other debris may cause the mower to lose power or make uneven cuts.

Check the belt. If it is damaged or off the pulley, it may cause the mower to move slowly or improperly.

Examine the crankshaft, if damaged it can cause excessive vibration.

Check the grass catcher is clean, otherwise it may stop venting air and won't be able to fill properly.