How to Install a Starter and Rewind the Spring to a McCulloch String Trimmer

29 Nov

How to Install a Starter and Rewind the Spring to a McCulloch String Trimmer

The recoil starter assembly on your own McCulloch string trimmer contains three individual components: a starter string, rope pulley and rewind spring. The starter string is usually the first thing in the recoil starter assembly that will require servicing or replacing because friction contributes to rapid wear on the string. The spring has to be rewound so that the rope starter can wind back into the casing when pulled. Inspect each region of the recoil starter assembly for wear through string trimmer disassembly to avoid a costly break if a part fails.

Unscrew the retaining screws from the air filter housing on the left side of the motor using a No. 25 star-shaped screwdriver to get the carburetor throttle arm.

Unhook the Z-shaped throttle cable end from the carburetor throttle arm using needle-nosed pliers. Tape a length of wire or heavy string into the Z-shaped finish with electrical tape to help track the cable through reassembly.

Unscrew the four clutch housing/boom head retaining screws from the recoil starter casing using the star-head screwdriver. Pull the clutch housing/boom-head free from the recoil starter casing. Pull the engine stop switch wire connectors from the engine stop switch connector tabs using needle-nosed pliers; put the clutch housing/boom head apart.

Disconnect the spark plug wire lead from the spark plug by hand and then remove the spark plug from the engine cylinder using a spark plug socket wrench. Push an 18- to 24-inch length of thin string, like clothesline rope, into the engine cylinder to serve as a soft piston cease for clutch removal.

Unscrew the clutch drum from the crankshaft using a very long No. 25 star-head socket driver attached to a ratchet wrench. Insert the star-head motorist into the middle clutch drum hole and then flip counter-clockwise to remove. Pull the motor clutch drum free from the engine crankshaft.

Set a soft metal drift onto the face of the motor clutch rotor. Tap the metal drift with a hammer at a counter-clockwise movement to loosen the clutch rotor. Pull the clutch rotor from the engine crankshaft.

Unscrew the four recoil starter casing retaining screws and pull the recoil starter marginally from the motor assembly. Pull the halt switch wire connectors from the motor ignition module using needle-nosed pliers. Squeeze the throttle cable plastic poles using needle-nosed pliers while pulling the throttle cable rearward to remove the throttle cable.

Pull the recoil starter casing from the motor assembly; put the recoil starter on a good surface using the recoil starter pulley facing upward. Pull the recoil starter rope marginally from the recoil starter casing, hold the pulley in place and cut the starter string below the rope grip. Let go of the pulley slowly so that the recoil spring unwinds and relieves the rewind spring tension.

Unscrew the starter pulley baffle retaining screws from the recoil starter casing with a No. 25 star-head screwdriver. Boost the pulley and recoil starter pulley from the casing. Detach the starter pulley from the rewind spring hook-end and recoil starter casing by hand. Boost the plastic washer from the recoil starter casing shaft that splits the pulley and rewind spring.

Unwind the old starter string from the recoil starter pulley and remove it from the pulley recess using needle-nosed pliers.

Push the new starter rope finish into the rope hole at the starter pulley, pulling it out through the pulley recess using needle-nosed pliers. Tie a knot at the end of the string and then pull the rope to secure the knot in the recess.

Feed the opposite end of the starter rope through the recoil starter casing rope hole. Slide the rope grip onto the untied recoil starter rope finish. Tie a knot in the end of the rope and pull tightly to secure the knot in the grip top. Put the pulley into position on the recoil starter casing pulley shaft using the rewind spring hook-end aligned using the starter pulley shaft.

Pull 10 inches of pull rope back through the starter casing; loop the rope so it allows the pulley to wind. Wind the pulley clockwise until the rewind spring tightens, and hold the pulley in place. Release the pulley slowly, permitting it to unwind a couple of full revolutions to pressure the rewind spring.

Pull all the rope from the starter casing. Release the pulley slowly to permit the string to rewind into the starter casing. Replace the pulley inside the starter housing and tighten the retaining screws.

Pull and release the brand new starter rope a couple of times to ensure it rewinds into the home with no opposition. Construct the string trimmer in reverse order of disassembly. Pull the short piece of thin string you utilized as a piston stop. Reconnect the spark plug and spark plug wire. Test the new starter string to guarantee the engine begins.