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-
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
5. Remove the spreading gun from the
clamp or V-block assembly. Manually un-
screw and remove the cartridge from the
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
7. Remove the safety pin from the spreading
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.