Service and Adjustments, Replacing the Line

SERVICE AND ADJUSTMENTS

REPLACING THE LINE

1.Remove spool by firmly pulling on tap button.

2.Clean entire surface of hub and spool.

3.Replace with a pre-wound spool, or cut two lengths of 12-1/2 feet of 0.080″ (2 mm) di- ameter WEED EATER brand line.

WARNING: Never use wire, rope, string, etc., which can break off and become a dangerous missile.

4.Insert ends of the lines about 1/2 inch (1 cm) into the small holes on the inside of spool.

Spool

Small

Holes

Line exit holes

Line in Notch

Line in Notch Hub

5.Wind the line evenly and tightly onto the spool. Wind in the direction of the arrows found on the spool.

6.Push the lines into the notches, leaving 3 to 5 inches (7 -- 12 cm) unwound.

7.Insert the lines into the the exit holes in the hub as shown in the illustration.

8.Align the notches with the line exit holes.

9.Push spool into hub until it snaps into place.

10.Pull the lines extending outside of the hub to release the lines from the notches.

REPLACING THE CUTTING HEAD

1.Align hole in the dust cup with the hole in the side of the gearbox by rotating the dust cup.

2.Insert a small screwdriver into aligned holes. This will keep the shaft from turning while removing and installing trimmer head.

Screwdriver

3.While holding the screwdriver in position, remove trimmer head by turning clock- wise (looking from bottom of unit).

4.Thread replacement trimmer head onto the shaft by turning counterclockwise. Tighten until secure.

5.Remove the screwdriver.

CARBURETOR IDLE SPEED ADJUSTMENT

WARNING: Keep others away when making idle speed adjustments. The trimmer head will be spinning during this procedure. Wear your protective equipment and observe all safety precautions.

The carburetor has been carefully set at the factory. Adjustments may be necessary if you notice any of the following conditions:

S Engine will not idle when the throttle is released.

Make adjustments with the unit supported so the cutting attachment is off the ground and will not make contact with any object. Hold the unit by hand while running and making ad- justments. Keep all parts of your body away from the cutting attachment and muffler.

To adjust idle speed:

Allow engine to idle. Adjust speed until engine runs without stalling (idle speed too slow).

STurn idle speed screw clockwise to increase

engine speed if engine stalls or dies.

STurn idle speed screw counterclockwise to decrease engine speed.

Idle Speed Screw

Air Filter Cover

If you require further assistance or are unsure about performing this procedure, contact an authorized service dealer or call 1--800--554--6723.

545186834, MX550 specifications

The Weed Eater MX550, model number 545186834, is a powerful and efficient string trimmer designed for both residential and light commercial use. This reliable tool is engineered to provide excellent cutting performance, ease of use, and versatility, catering to various lawn care needs.

One of the standout features of the MX550 is its robust 25cc two-cycle engine. This powerful engine ensures optimal performance, allowing users to tackle tough grass, weeds, and overgrown areas with ease. The engine delivers impressive power while remaining lightweight, which minimizes operator fatigue during extended use.

The MX550 is equipped with a 16-inch cutting swath that efficiently covers large areas in a short amount of time, making it ideal for homeowners or landscapers with sizable properties. This wider cutting path allows users to reduce the time spent trimming, thereby increasing productivity. The tool is compatible with both regular trimmer line and heavy-duty line, catering to different cutting scenarios based on user preference.

Innovative technology is featured in the MX550 with its easy-to-load, bump-feed head. This design simplifies line replacement, allowing users to quickly and efficiently reload the trimmer line without the frustration often associated with traditional systems. The bump-feed function eliminates downtime, ensuring that the trimmer is always ready for action.

Moreover, the Weed Eater MX550 comes with adjustable handlebars, providing a comfortable grip for users of all heights. This ergonomic feature enhances control and maneuverability, making it easier to work in tight spaces or navigate around obstacles such as trees and flower beds.

This model also prioritizes user safety and convenience. It features a clear debris shield that protects the operator from debris while providing a clear view of the cutting area. The trimmer’s balanced design and lightweight frame reduce strain on the user, making it an ideal choice for extended periods of operation.

Additionally, the MX550 is designed for easy maintenance, with accessible components that allow for straightforward cleaning and servicing. This ensures the longevity of the trimmer, keeping it in peak operating condition for years to come.

In summary, the Weed Eater MX550, 545186834, combines power, versatility, and user-oriented design features to create an effective string trimmer for a range of trimming tasks. Whether you are a homeowner looking to maintain your lawn or a professional landscaper seeking reliable equipment, the MX550 stands out as a dependable choice in the vast market of outdoor power tools.