Question about Senco GT90 Clipped Head Gas Framing Nailer
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Posted on Jan 02, 2017
This problem can happen because of several reasons.
Most likely the driver stuck, and not able to move.
First with the tool disconnected from the air supply check to see if there any nails jammed in the nose piece.
If the driver is stuck down, try to push it up. Will it move?
If there are no problems visible at this point you will have to open the tool up, and see if anything looks out of place.
To examine the inside of the tool, unscrew the 4 bolts on the cap of the tool. Gently remove the cap, it may be spring loaded but once the bolts are loosened, there is no reason to be afraid of the parts springing out. Be careful not to let the parts that are in the head cap fall out. Also take care not to rip the gasket. Keep in mind, the less parts inside that you disturb the better so be careful.
If the piston driver does move. Does it move freely?
Sometimes when a driver hits a very hard knot in the wood, or if a nail is hit. The thin driver may bend. If it is moving but with resistance. Use a thin object to push the driver upward from the nose. It will come out of the head cap end.
Check to see if the driver is straight and square to the piston. If it is bent, you may need to replace it. Sometimes you may be able to bend it back enough to allow the piston driver to move freely.
If this solves your problem. To reassemble:
Replace the driver in the correct position. Replace the gasket if it is loose. If parts came out of the head cap, reposition them into the cap. Replace the head cap on to the tool. Replace the bolts, stagger as you tighten them to depress spring loaded parts evenly.
Hook the tool up to your air supply check for air leaks, and fire the tool.
If the driver does not move: Examine to see what is seizing the piston and reply back.
I hope this works!
Posted on Apr 19, 2009
SOURCE: Senco SN4 nailer not feeding
ther isn't a spring, it works on air to pull the driver back up. Have you tried oiling the tool as recommended (about 6 drops a day) If not then you have a problem with either o rings that are dried out or worn so they cannot keep the suction required for the tool to operate properly. Might also be a bent driver (doubtful). Go to Senco.com and type in your model number and they list rebuild kits for this tool. If you need more assistance let me know and if I have helped with your request would you please rate this accordingly.
Posted on Sep 12, 2009
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