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Hi Wanda, I know this suggestion is a couple of months too late to be useful, but I ran into the same problem with my brand new Porter Cable miter saw. In order to pull out the safety pin/lock, you need to firmly wiggle the "switch handle" a bit. The "switch handle" is what the instructions call the main handle near the blade that you will eventually use to pull the saw down and make your cuts. The weight of the blade and motor appear to put some pressure on the lock pin and prevent it from disengaging. Hopefully that helps someone that runs into the same issue.
There is one pin with a retaining o-ring that must be removed holding the trigger arm in - then there are 2 roll pins that must be driven out with a small punch that hold the trigger valve. Once the 2 pins are removed the trigger valve can be pulled straight out.
When you install the new trigger make sure the recesses in the trigger line up with the holes for the retaining pins.
The feeder pin used by hitachi has a shoulder on one side and a rubber washer /retainer on the other. There is only one groove and the retainer fills the groove and if the correct pin and spring, no extra room to fit an exstra retainer unless the shoulder is worn so bad that the pin is falling thru the plunger. I have seen a lot of creative ways that owners use to hold the pin in place due to lost rubber retainer or lost pin. I also see many guns that have installed a retainer pin from porter cable which has two grooves (one on each side of the pin and no shoulder ). Porter cable pin works fine and fits perfect. Good luck
Your throttle valve seal is bad or your trigger pin is stuck. Go to ereplacementparts.com and type in your model# this will give you a detail of the parts broken down.
the triggers are held in place in the handle with two roll pins. the trigger itself operates off a hinged paddle inside the trigger. this paddle won't operate unless the safety is depressed. both safeties have a return spring. if yours are missing nothing will work. go to porter cable parts site and purchase the correct parts
I've had to remove the plate over the "firing pin" a couple of times (the allen wrenches come with the gun) to release it. Mine was caused by a bent pin, that happened when I hit the hose and knocked it off the bench.
When I finally replaced it (CPO/Porter Cable), it's been fine ever since.
I have seen many Porter Cable pin nailers with a bent or broken driver. Easy to check. With breakdown in hand (http://images.toolpartsdirect.com/schematics/portercable/pin100.big.pdf) remove head nut and other parts to gain access to piston/driver. (parts # 60084) Most drivers have the tip missing or driver is bent. Replace as needed. If driver looks good replace driver into cylinder and push all the way down. The driver should extend about 1/8" past nose. Check for obstruction around lower bumper. Parts are not expensice and are available at WWW.toolpartsdirect.com. Please email if you have any questions. Good luck.
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