Have taken gun apart ,and now can remember how it all goes back together , when nailing the thing that slides was jamming , now apart there are 2 pins im not sure where they should be

check for jam with the ram--clean and lube ram - using the correct brads --feed slide/spring weak or sticking--bur or flat spot on ram -ram spring weak or sticking

If your using refills that have wire holding the nails together.
Check to see if bits of wire, debris is collecting in around the striking hammer. I switched to paper and never looked back. Must have gone through 5k worth of nails and rarely jams. Other things to check,
1. Check the striking hammer, make sure it is not bent or damaged.
2. Check air pressure, Low pressure can cause jamming, misfires.
3. If the tool needs pneumatic oil, 2-3 drops before you start good rule of thumb.
4. Check spring return. Sufficient pressure must be maintained or the nails will not feed properly. Misfires, incorrect feed, jamming etc.
I had a Hitachi brad nailer and it was horrible. Fire 1 brad nail would jam or misfire. Did everything I could think of nothing worked. Put it up, got a Rigid brad nailer and never looked at the Hitachi again. :)
Sometimes you just get a lemon! (PS I understand you have a framing nail gun. Brad nail gun above is used for an example)
Hope this helps

make sure nails are loaded into the gun straight and correctly

I had this problem too, and finally figured out what was wrong. If you have cleared a jam and have put the nail gun back together, then all you get is a 'thunk' when you try to drive a brad, you have put it back together wrong, as I did. Take the two screws out and pull out all four pieces -- three plates and one skinny 'T' shaped piece. Look inside the unit and you'll see a pointed piece, which is the hammer that drives the brad in. This next step is key: put the first plate back in (the one that is flat on both sides) making sure that it slides in UNDER the hammer. The hammer fits loosely in its housing, so it may help to turn the nailer upside down so that the hammer falls down, giving you the room you need to get the plate in--again, so that it's UNDER the hammer when you turn the nailer back over. Once you have done this part, simply slide the second piece in (the one with the fluted strip down the middle), slide it in fluted side up, then the 'T' piece (with the 'T' in first) then the last piece with the wider groove that contains the 'T' piece. Replace screws and you're back in business! This information may be in the instructions, but I have long ago thrown those away.

I could not find one on the net. I would go to the Arrow web site and use the "contact us" link to send them an email requesting a diagram.

http://www.arrowfastener.com/

Susan Sylvia is exactly right. I just fixed my tool with her information. I would add to be very careful not to disturb the 2 small springs(associated with the trigger and safety mechanisms) and take note of how they are positioned. Also, the screws seem to strip unusually easily so be gentle when removing and replacing them.

Here is the link but I copied the instructions here too

http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000035709.pdf

Loading Staples or Nails

Make sure there are no staples or nails jammed from previous usage by checking the handle operation.

CAUTION: IF A STAPLE OR NAIL IS JAMMED, POINT THE GUN AWAY FROM

YOURSELF AND OTHERS BEFORE OPENING THE TRACK AS THE JAMMED

STAPLE OR NAIL MAY BE FIRED OUT UPON OPENING

i) Point the bottom of the gun away from you and turn gun sideways.

ii) Turn gun up, grip track release buttons and push away to release, then slide the track out, as shown (fig. 1).

iii) Insert a strip of staples in the chamber with the legs pointing up (fig.1a). If nails are required, turn gun upside

down and tilt the gun away from yourself and load on the right hand side (as indicated on graphics at the

staple and nail exit) with point facing upwards (fig.1b) THE GUN MAY JAM IF NAILS ARE INSERTED IN THE

WRONG SIDE.
*Arrow

iv) Slide staple or nail track back into closed position - a click indicates that it is locked in position.
Your staple and nail gun is now ready for use.

I may need more information but you ,should be able to take it apart like any other nail gun.

go to Paslode.com and you can download a manual that shows the spring. It sits in a recess under the follower that pushes the nails

hi visit your supplier and ask for a overhaul kit once fitted your tool will be licke new
best of look ian