Figure 2-23.-Loosening cartridge

By following the steps outlined below, you can replace the cartridge and perform the firing pin pull-force test in a safe manner. 1. Clamp the spreading gun test fixture to the packing table. Use one C-clamp positioned as close as possible to the clamp assembly. See figure 2-21 for the test fixture parts identifi- cation. 2. You must remove the cartridge extractor wrench from the swivel bolt attached to the spreading gun clamp assembly. 3. Then place the cartridge end of the spreading gun into a spreading gun clamp assembly (fig. 2-22). Ensure that the lip on the clamp assembly circles the spreading gun housing. Route the retaining cord through the vertical slot in the center of the clamp and spread suspension lines to prevent entrapment between gun and clamp. Position the swivel bolt in the horizontal slot in the clamp, and torque the swivel bolt nut to 7 ± 1/2 foot-pounds. 4. Place the pins of the cartridge extractor wrench into holes in the cartridge. Loosen the cartridge using pressure against a 3/4-inch socket, as shown in figure 2-23. NOTE: If you have difficulty in re- moving the cartridge by using the ex- tractor wrench furnished with the test fixture, use a special cartridge extractor tool. Cut and remove the retaining cord at the base of the cartridge. Place the slot of the special tool over the retaining cord pin, and loosen the cartridge by using a 1/2-inch socket. 5. Remove the spreading gun from the clamp or V-block assembly. Manually un- screw and remove the cartridge from the chamber. 6. Remove the cartridge from the retaining cord by removing the pin. Retain the pin for reinstallation if required. The old cartridge must be disposed of in accordance with current directives. 7. Remove the safety pin from the spreading gun. 8. Spread the canopy skirt hem and suspen- sion lines to expose the cartridge chamber. Slide the spreading gun onto the test fixture shaft Figure 2-22.—Placing spreader gun in gun clamp. Figure 2-23.-Loosening cartridge. 2-13