Re: Trigger button on Saitek ST290 is stuck in fire...
I've disassembled the ST290 to get at it's internals. It wasn't easy. It's not something I would recommend and finding the exact same lever switch to replace the damaged one would be tricky, not to mention soldering in the new switch and all.
I have seen the ST290 at Radio Shack stores for less than $20. You might be less frustrated just getting a new one.
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what do you mean fires two at one time or two like bam bam.? different things all together. two at one time is the nose piece and normally occurs on coil nailers when they wear out. If its bam bam then, yout trigger is black and its called a contact tip trigger, meaning as long as the safety is pressed down and the trigger is held it will fire. But common problem is when people use a gun and put it on the board and pull the trigger. Like any gun there is a " kick" the kick is the operation of air going through the gun hitting the piston which is attached to the driver, pushing the nail into the board, ( a lot of energy directed straight down) pushing the gun up. and the trigger while released actually is making you pull it twice. So, as a tech I teach new people that there is a sequential trigger that does not do that or if your good with your aim try holding the trigger and tapping the board a single time.
but long and short of it, nose worn ( pricey) or trigger
Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck
If the trigger is set to single fire, you will need to place the gun against the work then pull trigger as you have done. Try setting the trigger to bump fire and try again. If hear a thump inside the gun, remove the head and check that the head valve in not stuck from lack of lubrication. Easy test, remove the nails, remove trigger pin, remove trigger and manually push trigger firing valve. If the gun fires then suspect faulty trigger or safety arm not lifting enought to activate the trigger valve. Good luck
Dewalt has two triggers available for their framing nailer. The black trigger (390746-00) is a bump style trigger. While holding the trigger, you will be able to fire a nail by pressing nose against work. This trigger is preferred by most framers because it is much faster. Gray trigger will only allow one nail to be fired. Bumping will not work with the gray trigger. With trigger released, you must place the nose against work then pull trigger to fire. To fire next round, you must release trigger, pull gun off the work, again place nose against work then press trigger. Check dewalt web site for recall information. Some dewalt framers have been recalled for faulty trigger. Good luck with your projects.
May be due to broken tip. Easy to check. Remove nails and leave door open. With door open, lightly tap the nose of the gun against coiled rubber hose or soft wood. The driver should stay at top position. If driver falls to bottom of the cylinder, replace piston oring. Now press nose of the gun against old coiled up air hose or soft wood and squeeze and hold trigger. The gun will fire and the driver should stay in the down position untill you release the trigger (if not single fire trigger, if single fire trigger remove trigger and press the trigger pin with finger). While the driver is down, make sure that the tip extends past the nose about 1/4 inch (if air leaks past the nose in this position, replace lower bumper). If the driver does not extend past the nose, replace driver. Good luck
Not all nailers have the ability to bump-fire. It depends on the type of trigger and the firing valve that the trigger contacts. Remove gun from air supply and remove the nails (for safety). Take a close look at the trigger itself looking for a bump fire setting. It will have a rotary dial to select single or repeat fire. If no setting, look at how the safety foot contacts the trigger's inner trip lever (the trip lever inside the trigger is what actually contacts the firing valve pin). With trigger pressed in, push the safety foot in and notice if the safety contacts the inner trigger lever. On bump fire trigger, the safety foot mech. will push up on the inner lever each time that you press in safety (and you will see that the inner lever will depress the firing pin). On single fire trigger, with trigger pressed, when you push on safety foot, the mech. will not contact inner trigger lever because the lever is too short to allow safety to make contact with it. On single fire triggers, the inner lever can make contact with safety only when trigger is in the resting position. With trigger released, depress safety and notice that safety contacts inner trigger liver and will remain in contact untill you press the trigger at which time the inner lever will depress the firing pin then fall away from safety. If you are a tinker-er, you can make adjustment to inner lever so that it will make constant contact (the rotary dial on triggers that are made to give you a choice of bump or single actually make the inner lever longer or shorter ). If you make any adjustments, make various and numerous tests with-out nails to make sure that it will not fire accidently.
Most all nail guns can be converted to single fire, however, usually parts must be changed. Some brands have two positions on the trigger, others have a button position near the trigger to accomplish same. Check with dealer or email your gun model # and I will explain your to fix. For now you can replace the spring on the safety with one slightly stiffer. Also try nailing with trigger depressed and quickly bump the gun to fire, this method usually works better than placing the gun in position then firing. Good luck with your repair.
if its oiled, then take all the nails out of the track and chamber, check to see if your firing valve is stuck( it is suppose to go up and down , opening and closeing the cylinder, but sometimes it gets stuck) first press the safety in all the way ( you may have to pull the feeder down ) then press the trigger , then hook the hose to the gun in that order this will sometimes unstick the firing valve
On most all nailguns when the trigger is activated air pressure is released from the headvalve causing the headvalve to open and fire the piston. If air leaks through the headvalve orings or through the headgasket port to headvalve, it will not fire. Try applying light grease to headvalve orings and make sure that headgasket is sealing around vent hole. If it fires then replace orings in headvalve for long term repair. Secondary problem is worn safety parts and trigger or trigger pin. If these parts are worn the trigger will not push the trigger valve pin all the way in when you bump fire the gun. With air supply disconnected, apply pressure to safety while depressing the trigger and check thet the pin is moving all the way into the trigger valve. Adjust or replace as necessary. Enjoy