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HomeRepair HelpMilwaukee Mower RepairMilwaukee Lawn mower won't start Repair
Milwaukee Lawn mower won't start
If your Milwaukee lawn mower won't start, start with the most common cause first: the spark plug. A cracked insulator, damaged electrode, heavy carbon buildup, or no spark at all when checked with a spark plug tester can keep the engine from firing. Next, look at the carburetor, since stale fuel often leaves sticky deposits that clog passages and cause a lawn mower not starting condition. In many cases, cleaning the carburetor with carburetor cleaner helps, but if not, a carburetor repair kit or a full carburetor replacement may be the better fix. Old or bad gasoline in the carburetor float bowl can cause the same problem, so draining stale fuel is often part of the repair. If the fuel system checks out, test the start switch with a multimeter for continuity. On models equipped with a fuel pump, inspect the pulse line, diaphragm, and check valves, especially if overfilled oil may have contaminated the line. Whether your Milwaukee push mower won't start or your mower engine will not turn over as expected, enter your model number on RepairClinic.com to find the exact replacement part that fits your lawn mower.
01 - Milwaukee Lawn Mower Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
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02 - Milwaukee Lawn Mower Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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03 - Milwaukee Lawn Mower Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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04 - Old or Bad Gasoline
There may be old or bad fuel in the carburetor float bowl. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
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05 - Milwaukee Lawn Mower Start Switch
To determine if the start switch is defective, use a multimeter to test it for continuity.
Highly Likely
06 - Milwaukee Lawn Mower Fuel Pump
The fuel pump has three ports: the gas in port, the gas out port, and the pulse port. The pulse port is connected to the engine crankcase by a small rubber tube. As the engine runs, air inside the crankcase alternately pressurizes and depressurizes the air in the tube. This pressurized air moves a diaphragm inside the pump and pumps the gas. If the engine oil is overfilled, oil can enter the pulse port line, preventing it from working properly. The fuel pump also has two small check valves on the input and output ports. The check valves prevent fuel from reentering the gas tank. These check valves can fail. To determine if...
Highly Likely
Frequently Asked Questions
Why won't my Milwaukee lawn mower start?
My Milwaukee lawn mower has spark but won't start. What should I check next?
How do I know if the start switch is bad on my Milwaukee lawn mower?
Can old gas keep a Milwaukee push mower from starting?
How do I find the right spark plug, carburetor, start switch, or fuel pump for my Milwaukee lawn mower?
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