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Re: hand safety control on gmc grass cutter
A hypodermic needle assembly configured such that the movement of a needle shield into position to block the needle tip occurs as a direct consequence of a longitudinal force applied by insertion of a syringe plunger is provided. The hypodermic needle assembly according to the present invention includes a needle, a needle hub, and a safety spring clip assembly, the safety spring clip assembly being configured to automatically launch from the needle hub and slide along the needle to shield the needle tip, thus preventing accidental contact with the needle tip. Additional mechanisms for launching the safety spring clip are also provided, which include using a trigger ring for rotating and launching the safety spring clip.
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if it has the green trigger you pull up to move height adjuster it is common that they snap or the roll pin comes out. simply take out the 2 cross head scews from the handle and remove handle, the trigger will then be free to remove, there will be a compression spring on the trigger dont loose it!!!! the triggers are quite cheap and can be bought online at ebay etc, just slide trigger back into handle bot forgetting to reit spring. refit handle to chassis and refit the 2 screws
There are control micro switches on the machine for safety reasons .1 is under the seat so that you have to be seated to start.2 is the brake --you have to have your foot on the brake as well 3 is the cutter deck --it has to be in neutral. Your machine will have at least 2 safety items in the electrical circuit.
This gun should be bump-fired only. Do not place the gun on the work and press trigger. Make sure that the safety spring is in place and has good tension. The spring helps to push the foot off the trigger so that it fires once. You could also adjust the screw that pushes on the firing valve. Turn in or out several turns till head of nail is correct when bump firing then lock the nut. The safety foot fits rather loose on the gun and should still work ok but can get so loose that it falls off the nose. Good luck
Assuming that you are using the correct nails. This will usually happen if you have bump-fire trigger and are trying to place the gun on the work then pull trigger. Replace the safety spring if weak and bump-fire only (spring should be very firm). If you have single fire trigger, replace the trigger and the trigger valve for good operation. If you have always been bump-firing and now double firing, replace the safety spring and trigger orings. Good luck
Several of the sellers on EBay in the Home and Garden category specialize in these trimmer parts and probably have what you need. It is usually more economically-friendly than buying from a repair shop.
Look at the top of the head (where the brush cutter is) find the small hole about 3/16 diameter. Insert an allen wrench or a large nail, or anything else that will fit in the hole almost the same size as the hole. While putting a little downward pressure on this "tool" turn you blade slowly by hand until you feel the tool slide into the locking slot, this will hold the blade from turning. Keeping it in this position, take a socket and ratchet on the nut that is holding the blade and loosen and remove it. THE NUT HAS LEFT HAND THREADS SO TURN IT OPPOSITE OF WHAT YOU NORMALLY WOULD TO REMOVE IT!!!!
Sounds as if you have a small Bostitch nailer/stapler. Bostitch lables its safety mech parts as Safety A for the part that actually contacts the work and Safety B for the part that contacts the trigger. Go to www.Bostitch.com and look for diagram of your gun. These two parts fit snuggly just behind the outer-most guide/nose. Safety b sits on top of safety a. There is usually a thumb adjustment and a spring between the two parts. The spring is usually installed on top of safety a and below the adjustment knob. enjoy