Question 1

How to disassemble and change the cutting head of the MCCULLOCH B26 PS?

Accepted Answer

To disassemble the cutting head of your MCCULLOCH B26 PS, follow these precise steps:

Preparation

Stop the engine and remove the spark plug cap to prevent any accidental starting.

Locking the shaft

Rotate the blade shaft until one of the holes in the drive socket aligns with the corresponding hole in the casing. Insert the locking pin (C) into the hole to lock the shaft and secure the operation.

Loosening the nut

Use the provided wrench to loosen the counter-nut (G). Important: this nut is left-threaded, so turn it counterclockwise to unscrew it.

Removing components

Successively remove:

The nut (G)
The ground guard bowl (F)
The support flange (E)
The weeding head (H)
The drive socket (B)

Replacement

The original cutting head is the P25 Weeding Head (reference 580 30 50-01), compatible with wire from 2 to 4 mm in diameter. Follow the section "Installing the head protection and weeding head" in your manual for reverse reinstallation.

Question 2

How to change the cutting disc on the MCCULLOCH B43 BT brushcutter?

Accepted Answer

To change the cutting disc on your MCCULLOCH B43 BT brushcutter, follow the steps below safely:

Steps to change the cutting disc

Safety: Ensure that the machine is turned off and disconnected from any power source. If your model is battery-operated, remove the battery before starting.
Loosening the screw: Use an appropriate wrench to loosen the screw that holds the disc in place. Turn the screw counterclockwise (to the left) to unscrew it.
Removing the disc: Carefully remove the old disc from the chuck.
Installing the new disc: Place the new disc on the chuck, ensuring it is properly aligned and positioned correctly.
Securing: Re-tighten the screw by turning it clockwise (to the right) and tighten it firmly to hold the disc in place.
Checking: Ensure that the disc is securely fixed and has no play before restarting the machine.

Following these steps ensures a safe and effective disc change, prolonging the life of your MCCULLOCH B43 BT brushcutter.

Question 3

Why won't my MCCULLOCH B428 PS trimmer start and how can I resolve this issue?

Accepted Answer

If your MCCULLOCH B428 PS trimmer won't start, several common causes may be behind this problem. Here are the steps to check to try to resolve it:

1. Fuel Check

Make sure the tank contains fresh and suitable fuel (usually a 2-stroke gasoline mix if applicable).
If the fuel is old, empty the tank and refill it with new fuel.

2. Spark Plug Inspection

Remove the spark plug and inspect it for any signs of dirt or damage.
Clean the plug with a wire brush or replace it if it is worn or defective.
Ensure that the spark plug wire is properly connected.

3. Air Filter Inspection

A dirty or clogged air filter can prevent the engine from starting.
Clean the air filter according to the manufacturer's recommendations or replace it if it is too dirty.

4. Starter System Check

If your model is equipped with a pull starter, ensure that the cord is not stuck and operates correctly.
Check that all safety levers and controls are in the correct position for starting.

5. Other Tips

Ensure that the trimmer is on a stable surface and that starting conditions are optimal (e.g., cold engine).
If the problem persists after these checks, it may be necessary to consult a professional for a more in-depth diagnosis.

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