McCulloch REX450 Spare Parts List
![McCulloch REX450 manual cover](/images/OwvLJmEPVUvSjaGODAkemihw/thumbs/thumb175x175.webp)
To start the McCulloch REX450 Trimmer, first ensure the trimmer is on a flat surface. Check that the on/off switch is in the 'on' position. Press the primer bulb several times until fuel is visible, then pull the starter cord briskly until the engine starts.
It is recommended to clean the air filter after every 5 hours of usage, check the spark plug monthly, and inspect the trimmer head for damage regularly. Additionally, replace the trimmer line as needed and have a professional service the engine annually.
If your REX450 Trimmer does not start, check if there is fuel in the tank, ensure the spark plug is clean and properly connected, and that the air filter is not clogged. Also, confirm the on/off switch is in the correct position.
To replace the trimmer line, turn off the trimmer and disconnect the spark plug. Remove the trimmer head cover, wind new line onto the spool following the directional arrows, replace the cover, and ensure it is securely fastened.
The McCulloch REX450 Trimmer is designed to use unleaded gasoline mixed with high-quality two-stroke engine oil at a ratio of 40:1. Always use fresh fuel to ensure optimal performance.
Adjusting the carburetor should be done carefully. Locate the adjustment screws on the carburetor. Start the trimmer and adjust the low-speed and high-speed screws to optimize performance. It is recommended to consult the user manual or a professional for precise adjustments.
When storing the REX450 Trimmer, ensure it is clean and dry. Empty the fuel tank and run the engine until it stops to clear the carburetor. Store in a dry, cool place and cover to protect it from dust and dirt.
Excessive vibration may be due to an unbalanced or damaged trimmer head, loose parts, or worn-out components. Check and tighten any loose screws or bolts, and inspect the trimmer head for damage or wear. Replace any damaged parts as necessary.
To clean the air filter, remove the air filter cover and take out the filter. Wash it with warm, soapy water, rinse thoroughly, and allow it to dry completely. Reinstall the filter and secure the cover before using the trimmer.
If the engine runs roughly, check the fuel for contamination, clean or replace the air filter, and inspect the spark plug for fouling. Adjust the carburetor if necessary and ensure the trimmer line is not too long, which can strain the engine.