The driver pin won't return after I fire the cleat into the floor. I have to knock it back into the mallet every time. I had the gun for more than 3 years now. It's gone through approx. 2,700 sqft. of flooring and this problem hasn't occurred til recently. Is there any way this can be fixed? What parts if any would need to be replaced aside from the drive pin itself? I purchased it from Princess Auto. SKU: 8101578 Model #: RP9800A Thanks in advance.

When a firing pin won't return it's usually caused by damaged o-rings inside the gun. The most likely culprits are the o-rings around the outside of the cylinder or the rings on the drive piston. Another cause could be a cracked cylinder or bent driver. Remove the cap on top of the gun and check the condition of the o-rings, cylinder and driver. You'll have to order any parts that need to be replaced as Bostitch doesn't make a rebuild kit for this gun. Don't forget to lightly oil the o-rings with pnumatic gun oil when reassembling the gun. Most pin and finish nailers say they are oil-less but they still need a drop once in a while to keep the o-rings from being damaged.

Could be bent driver or debris. Easy to check. Remove air supply and nails. Remove the four bolts holding bottom of nailer together. Make note of how the pieces are assembled. Set bottom parts to side move piston in and out of the cylinder. Should be fairly easy to move but should not drop out of cylinder of its own weight. Next insert driver into nose to check for smooth fit. Bent driver should be obvious and can be straightened. If driver looks good, find and remove debris from nose of gun. Good luck with your flooring projects Order spare parts kit to have on hand because drivers will break and bend and the lower bumper will begin to break-up.

That is most likely what needs to be replaced as that is the return spring. If it is weak it may not be allowing the driver to go back up far enough to let the next cleat load into the nose. Here is the parts diagram. Bostitch (Stanley Tool Works) just merged with DeWalt so you can get the part from either company now or a dealer of either company.

http://servicenet.dewalt.com/Products/Detail/MFN-201

Slight damage to driver will prevent it from returning to top of cylinder (assuming that nailer worked correctly before double fire). Easy to check. Remove airline. Use metal or plastic to push driver to top of cylinder (should easily move). After the driver is at top, see if first cleat moved into proper positon. If cleat is not in position, check pusher and rails for debris. If cleat is in position, activate nailer to check for proper function. If driver does not return to top of cylinder and was difficult to push up, pull out driver and check for bent /damaged driver and replace orings and lower bumper while apart if parts look worn. Good luck

needs lubed

I am not familiar with that name of nailer but when I have run into that problem it was because of too much oil used in the gun. If so this will have to be cleaned out. You do not have to oil a gun every time it is used if not used consistantly for long periods of time. Also are you using the proper guage nails? Something to consider hope this helps.

If you have a Bostitch MIII FN it is only for cleats. Bostitch doesn't make a universal nailer that takes staples and cleats. The MIIIFN is the "floor nailer" and the Model MIIIFS is the "floor stapler"
Maybe check exactly what model you have and ensure you are not trying to put cleats into a stapler.

2 things come to mind. I've installed Wood Floors for the last 5 years.

Make sure you have enough Air pressure running to the stapler,
and Second, Whack the hell out of it. You can be rough with it. Their designed to take a beating

When u hit it with the mallet, youre opening a valve which shoots the piston and drives the staple into the boards. hit it not hard enough, not enough air is being sent to the piston to drive it fully.

Using a wire "toothbrush" size brush, clean the track in front of the gun where the pin slides - where the nail groove is. **** particles from the nails and the plating from the nails sluffs off fouling the path and causes the pin to stick. After several cleanings of my gun, I noticed that this brushing of the track the firing pin follows keeps it operating for several days without the problem recurring!

couple of things there are o-rings inside that trigger assy. they are either pintched in or dry. next there could be internal rubber hoses inside the gun. might need replacing. lastly the hose or o-ring going to the back side of the ram is leaking or broken. here is what i would do. you sound pretty handy with your tools so i would get somewhere clean start taking the gun apart thouroghly noting where everything went and go untill you find the problem. but first i would shoot a couple of drops of oil into the air input on the gun then hook it up and fire a few off and see if it clears up, if not then start takeing it apart. I CAN NOT STRESS ENOUGH....DO THIS ON A CLEAN SERFACE WITH YOUR HAND CLEAN. i chased a leak around in a pnumatic hammer for 3 days all because it wasnt clean on the inside..