Milwaukee String Trimmer Problems

A Milwaukee weed eater is indubitably the most effective string trimmer when any homeowner talks about string trimmers. Its finest design features provide a perfect cut besides optimizing the power delivery from the world leader in cordless innovation.

But sadly, people face Milwaukee string trimmer problems now and then, particularly with the M18 fuel string trimmer.

In our guide, you can learn some of the most common issues you’ll face with these power tools with just a few tools from your versatile, durable modular storage system from Milwaukee tools.

By the end, if you are avid do it yourselfer, you’ll be able to deal with a Milwaukee string trimmer overheating fix on this great tool like the user who connected a small computer fan to prevent overheating. (Read Straight Shaft Vs Curved Shaft Trimmer)

string trimmer

How Long Does The Milwaukee String Trimmer Last?

Gas or electric string trimmers are available. The gadget works in the same fundamental way in each case: a motor turns a string trimmer head at the end of a drive shaft.

Most typical problems can be troubleshooted and repaired by someone with some do-it-yourself knowledge, and you’ll be able to get back to straightening up your landscape in no time.

Getting Started Problems

The fuel or the spark from the plug are the most common causes of starting troubles. Therefore, all two-cycle string trimmers use a gas and oil mixture.

  • This mixture is commonly 40 parts gasoline to 1 part oil, depending on the manufacturer.
  • The spark plug will become fouled if you use too much oil, and the engine will not start.
  • If you use too much gas, the motor will quickly burn out.
  • Fresh gasoline is required at all times. This is also true for four-cycle engines that exclusively run-on gasoline.


A poor spark plug can cause a motor to run and die or run fast and then slow. Milwaukee MX fuel equipment does a lot to fix this, yet it can still happen without maintenance.

  • Replace the spark plug if the trimmer starts but does not run smoothly or loses power. For example, if the spark plug is new, but the engine continues to operate intermittently, the gas could be old, or the gas and oil mix could be off in your outdoor power equipment.
  • Milwaukee recommends this product with a four-cycle motor; you empty the tank and add fresh gas or mix up a new gas-to-oil ratio in a two-cycle motor.
  • The set screws on the side of the motor can also be adjusted. One screw is for idle operation, and the other is for high-speed action.
  • The idler set screw is turned during idle to ensure that the motor idles smoothly and readily at just the proper speed, preventing the trimmer head from turning.
  • Turn the high-speed set screw as you pull the trigger for a high-speed operation to get the greatest rpm without the motor hesitating or balking.

Electric Characteristics

Although electric string trimmers require little maintenance, they might develop issues that require troubleshooting. (Read Bad Boy Mower Troubleshooting)

  • The ideal way to use corded types is to plug them into a dedicated outlet. However, the breaker supplying the power may trip if used in outlets with other equipment plugged in.
  • Battery-powered trimmers should be charged for several hours before use to ensure that the battery has adequate power to accomplish the task.
  • Consider upgrading to a quick charger or purchasing an extra battery if you run out of power before finishing the trimming operation.

Problems with Easy Load Trimmer Head

Bump feed mechanism and automated Quik Lok feed hedge trimmer heads are available on a Milwaukee weed eater head. To move the line, bump feed heads are bumped on the ground.

  • Centrifugal force is used by automatic Quik Lok feed heads to advance the line on a Quik Lok string trimmer as it shortens.
  • The line must be coiled correctly and be the correct thickness in both systems to make the line loading experience a breeze.
  • A thinner line may feed excessively. A thicker line may feed insufficiently on an M18 fuel string trimmer or a battery-powered Quik Lok model offering great power from the world leader in cordless innovation.
  • Every trimmer manufacturer has a recommended line thickness, and the line thickness is usually stamped right onto the trimmer head.

Why Does My String Trimmer Keeps Stalling?

Typically a clogging carburetor occurs when fuel has been in the string trimmer for long periods. It can be the same whether you use sewer and drain maintenance or other tools. The manufacturer recommends this product has fresh gas after extended periods of inactivity. (Find the Top Rated Weed Trimmers)

With age, fuel components can vaporize, leaving a sticky residue. This, many users can face the same issue where fuel blocks carburetor and stops the engines’ performance.

String trimmers, regardless of brand, have issues. So people search for string trimmer alternatives, yet it doesn’t matter as a problem with an M18 fuel string trimmer Quik Lok system will be the same with a Quik Lok system from another brand.

Here are some of the most prevalent difficulties and complaints that get products average customer ratings that are often unjust.

  • Problems with stalling and abrupt shutdown
  • The problem of overheating
  • Trimmer lines are causing problems.
  • Batteries and chargers on the tool have limited life.

Every flow has an ebb. However, as previously shown, the Milwaukee string trimmer can cause some issues that are readily resolved.

Here’s a list of issues that can arise when using the Milwaukee string trimmer.

It Starts Then Stalls

This issue could result from both the overheating and the battery issue. For example, when the motor inside the Milwaukee string trimmer overheats, the trimmer’s performance suffers.

The Problem of Overheating

When the Milwaukee string trimmer is operated continuously for an extended period, it heats up from within. After a month of use, the trimmer battery will melt if this continues.

Problems With Trimmer Lines

Each Milwaukee trimmer can handle a variable line size. As a result, consider Milwaukee string trimmers the same as other string trimmers.

You can’t just thread the line and twist the bumping mechanism as you can elsewhere. Instead, you must remove the spool and manually wind the trimmer line.

battery life

Battery Life Is Limited

The battery problem isn’t very prevalent. It only happens when large swaths of grass need to be trimmed.

This could also happen if you have to use your string trimmer for an extended amount of time.

Milwaukee’s low speed is perfect when you need to cut through a thin covering of grass. In addition, the string trimmer’s battery life enables effective low trimming.

Similarly, the high speed is ideal for mowing overgrown grass. Many customers, however, believe that having both speeds on a single device is not required.

Milwaukee String Trimmer Solutions

Here are a few options for resolving your Milwaukee string trimmer problems.

Speed Control Solution

Milwaukee has a few older models that only have one speed. So those string trimmers are a great match if any user has the desired speed!

Fix Overheating Milwaukee String Trimmer

Milwaukee has yet to adopt any particular overheat protection. Because overheating occurs in such a small percentage of cases, the brand has not considered a repair.

  • During long periods of operation, though, you could consider giving the string trimmer a break.
  • Continue to use the 9 and 12 AH batteries for safety reasons, as they will not melt.
  • Another smart strategy would be to use this tool at a modest speed—this aids in reducing vibrations. As a result, the instrument will not become excessively hot.
  • Finally, try using a small insulated computer fan to send airflow to the motor driver power supply to keep it cool.

Trimmer Line Replacement

To begin, flip the trimmer head over and remove the spool by pushing in your taps. Drag the cover away from the spool housing after that. Be sure to use all the safety solutions, and your power is off.

  • After that, cut three wingspans of line. The center of the line will be visible when folded in half. This should be looped through the notch on the spool’s center rib.
  • Finally, make sure that both the bottom and top tracks are winding in the same direction. Then, secure the remainder in the top notches when you reach the end of the trimmer line.
  • Push the spool in after aligning up the spool and the lid. Then, finally, you’ll be ready to work!


Additional Batteries

The recommendation is to use an extra battery. Keep it charged and in your Milwaukee versatile, durable modular storage system. If you don’t have other batteries, solve the battery problem by giving your trimmer time to cool off after one hour. (Find the Best Trimmer Mower)

Fix Sudden Shutdown Problem

If your Milwaukee string trimmer stops working after a while, don’t worry; as an avid do it yourselfer, you can quickly learn how to fix it.

To begin, use gloves to inspect your motor driver’s power supply. Allow time for it to cool down if it is too hot. Then, after a few minutes, check to see if the temperature has dropped. If not, a tiny computer fan can be installed.

The second alternative is to replace the batteries. Then, place a fresh battery collection to test if it works.

Look at the spark arrestor. When your spark arrestor becomes blocked, the string trimmer engine stalls. Clean the spark arrestor with a brush after removing it. You could also think about replacing it.

Check for a blocked carburetor, which can occur if you leave fuel in your tool for an extended period. Use a carburetor cleaner to clean it. Replace or rebuild the part if it does not improve.

Milwaukee String Trimmer Problems (2)

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