The feeder area of the nailer incorporates small levers on both sides of the nails. On the body side, the spring loaded feeder retracts and pulls forward the first nail. On the latch side small spring loaded arm/s hold the nails in place once they are pulled forward. Open the latch and push on both the feeder and the retanier for firm spring tension. On some nailers, due to wear, the grippers on the feeder tend to wear off allowing the nail to slip out of place. On other nailers, the feeder arm/shaft tends to wear and alows the feeder to move out of alignment (check if the actual feeder arm can move from side to side). The feeder shaft should move forward and back with no side to side movement. Finally, some coil nails are welded together with too stiff of wire. After the first nail is driven, the second nail will have one or two strands of wire pointing out not allowing the nails to move into position. After first shot, the two wires should be cut off or bent down out of the way. Good luck.
SOURCE: Max 890s coil nailer does not advance nails when operated.
Make sure you have at least 100 psi available and I would pretty much drown the sliders and other moving parts in something like Marvel Mystery Oil.
SOURCE: Rebuild kit for a ISM sold by Hilti coil nailer model RC234B
I did some extensive research for you and found:
This Link to ISM FASTENING SYSTEMS
http://www.ismsys.com/ToolInfoRequest.aspx
If you Look Under the Category: Coil
Nailer Roll 15234 Open That PDF and It shows an Exploded View of Your Gun, and Available Parts. I think you should be able to find a Air Tool Shop in your Area That Specializes in Carpentry Air Tools and Probably Save a Bunch of $$$ on a Rebuild...However, Here is The Address & Ph. Number for ISM, and You could Call and get an Estimate of email them too.
WESTERN OFFICE
AIR NAIL
SOUTH GATE, CA
800.479.6455
Sounds to me Like all you need is a O-Ring Kit, and Perhaps a New Driver.
Good Luck, I hope all this Info works for You.
SOURCE: have ism coil nail gun what nails do i use where
Somewhere there should be a model #, I have never seen a ISM.
Most all bostitch roofing coil nails will fit there guns.
Below I posted there website where you can check the info on your gun.
http://www.bostitch.com/default.asp?TYPE=CATEGORY&CATEGORY=BOS_ROOFING_NAILER_STAPLER
SOURCE: My Bostitch RN45B-1 Roofing Nailer won't advance
remove and, replace the nail advance gear then retime the nailer
SOURCE: My hitachi nv45ab2 roofing coil
Hitachi coil roofing nailer will skip nails if the piston oring is worn, the feed spring is weak or lower bumper is cracked. Easy to check. Remove nails and air supply. With side door open point nose of gun up then down again. If the piston moves up and down in the cylinder, replace the piston oring. If piston does not move and is in the up position, check the feed spring for tension. With air supply removed and door open, slide feeder back and press on feeder from door side to check tension. It should spring back to position against rails.If is feels loose, replace spring and retainer pin if the pin is worn. If piston oring is good, and the feeder has good spring tension, suspect lower bumper and the plastic part below the bumper called the "sheet". Remove head and pull the cylinder to examine lower bumper. Parts are available at www.toolpartsdirect.com. Good luck with your repair
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