What causes a pull cord to lock up?
One way the starter cord can get stuck is due to hydraulic lock, which is caused by oil getting trapped in the combustion chamber. You’ll need to release the compression and the oil, so remove the spark plug and then give the cord a tug.
Why can I not pull the cord on my lawn mower?
If you overfill the crankcase with oil or you store the mower in such a way that it’s standing on its front wheels, oil can seep into the piston cylinder and restrict the movement of the piston. When the piston can’t move, the crankshaft can’t turn and you can’t pull the rope.
How do you unlock the pull cord on a lawnmower?
If it shows that the crankcase is empty, add the recommended oil for your mower. Put on leather work gloves, and gently push the mower blade until it turns, or push the blade from a safe distance by using a stick. After you can spin the blade freely, you should be able to pull the starter rope to start the engine.
How do I know if my lawnmower is seized?
Following are the signs that your lawn mower engine is seized.
- Engine sounds rough.
- Engine does not start.
- Blades do not move and are stuck.
- The cylinder and piston are fixed.
- Low oil level.
- Deteriorated fuel quality.