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Don't know what Jamie answered-- but only Ford Products have Fuel Safety Shut Off Switches
Keep in mind those switches only activate in a serious crash, so you have to know the fuel system & have wiring diagrams, to have a place to start testing
Unscrew the head's center bump-knob counterclockwise with your fingers.
Pull the bump knob off and take the spool cover off the head. Slide out
the spool and any remaining cutting line. Lift out the spring underneath
the spool. Take out the slide washer. Unscrew the arbor bolt either clockwise or counterclockwise, depending
on model, in the center of the trimmer head using the wrench. Take the
entire head off the end of the shaft.
You line up the head with "arrows" by turning the plastic bump knob on extreme bottom. When arrows line up with the head then you insert your line through the slots "OR" you insert the line in one side and it comes out the other side. Then you have to push pressure DOWN ******* the bump head while twisting the bump head clockwise to "pull in" the string until there's only about six inches left remaining on the "shortest" piece hanging out the side. use scissors to make the lines equal in size before staring the trimmer. Hope this helps.
I had this problem, and it was due to the breakage of a plastic part. If you slide the trimmer open you can see a piece of spring wire beyond the end of the word 'trimmer'. The broken piece should locate the end of this spring; if it fails then the spring no longer forces the trimmer blade fully shut. As the trimmer was opened and closed I could see that the spring did not stay symmetrically placed. I could also see one end of the spring inside the mechanism, rubbing on the surface under the slider - but not the other.
To help with the instructions, let me identify some parts: "A" is the sliding part that your thumb pushes to open the trimmer; it carries the word 'trimmer'. "B" is the hinged part that carries the trimmer blade itself and the word 'washable'. "C" is the flexible piece of black plastic that connects A to B and on which the central section of the spring pushes.
To fix, first remove the sliding section A: slide the trimmer open and push a thin screwdriver down one edge of the slider. Prise the lugs that hold A in place, away from their slots.
Disconnect the connector C from the blade part B (gently push the lugs outwards, one at a time).
Turn over the slider A and you should be able to see that one or both lugs that are intended to keep the ends of the spring in place, have broken. (They are on a silver moulding fixed to the underside of slider A). I fixed both ends in place with some two-part epoxy - be careful not to get glue on the other parts! Allow to dry completely and reassemble.
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