14 P3500
REPLACING OR REPAIRING THE PISTON
The piston is an expendable part and must be replaced periodically. Typical signs of a worn out
piston are: breaking, bending or mushrooming.
Prior to servicing the tool make sure there is no powder load in the tool. Use caution and do
not lose or damage any tool parts.
1. Using a pin, lift the end of the annular ball spring and rotate toward the top of the tool body.
Pull the piston stop back and out of the tool.
2. Slide the piston guide and baseplate assembly out of the tool.
3. Using a fastener, pry the shear clip off the baseplate. Replace the shear clip if it is damaged.
4. Remove the baseplate from the piston guide, then pull the piston out of the guide.
REASSEMBLY:
5. Tilt the baseplate and slide the fastener guide out. Press the guide out of the baseplate using a
piston if it does not slide out freely. Replace the guide if it is damaged.
6. Clean the piston using a wire brush. Inspect it for worn or damaged piston ring, chipped end, or
bending. Apply lubricant to the piston shank to minimize piston sticking from an overdrive con-
dition. Wipe the piston dry.
7. If a piston tip is damaged, it can be shortened a maximum of 0.20 inches. The tip of the piston
should be ground flat and at 90 degrees to the shank of the piston. The chamfer of the piston
must also be reground as shown. Piston grinding should be performed by qualified personnel
using the proper equipment.
8. Press the piston into the end of the piston guide. Be sure to push it all the way back into the
guide. Ensure piston is positioned correctly in piston guide.
9. Insert the fastener guide into the baseplate.
10. Align the groove in both the piston guide and baseplate. Slide the baseplate (with fastener
guide) onto the piston guide. Press the shear clip into place. Insert the piston guide and
baseplate assembly into the liner in the tool body. Be sure to align the groove with the opening
for the piston stop.
11. Replace the piston stop and rotate the annular spring into place.
Upon reassembly of the tool perform the following test. Depress the tool against a flat, hard
surface and pull the trigger. The barrel assembly should slide smoothly inside the tool housing
assembly. The firing pin should release after the trigger has been pulled.
CAUTION:
THIS TEST SHOULD BE PERFORMED WITHOUT A PIN OR
POWDER LOAD IN THE TOOL.
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