Nozzles And Blow-Off Cap; Recharging Procedures - Komatsu 930E-2 Shop Manual

FIGURE 2-3. NOZZLES AND BLOW-OFF CAP
6. Inspect lines, fittings and nozzles for mechanical
damage and cuts.
7. Check nozzle openings. The openings should be
packed with silicone grease or equipped with
plastic blow-off caps if equipped with nozzles as
shown in Figure 2-2. Nozzles of the type shown in
Figure 2-3 are not to be packed with grease. Only
the protective caps shown are to be used on this
type of nozzle.
8. Remove and inspect the cartridge of the remote
actuators. Replace if ruptured. Check operation
of puncture pin.
9. Replace any broken or missing lead and wire seals.

Recharging Procedures

After actuating the fire control system, the system
should be recharged. Follow the procedure below for
each dry chemical tank and actuator installed:
1. Relieve the pressure from the lines by pulling the
ring on the safety relief valve.
2. Disconnect line from tank actuator and remove line
from the bursting disc union.
M2-2
3. Remove each extinguisher from its bracket.
4. Disassemble bursting disc union and replace the
ruptured bursting disc with flat side toward ex-
tinguisher.
5. Fill tank with dry chemical to not more than three
inches (76 mm) from the bottom of the fill opening.
6. Inspect fill opening threads and gasket. If neces-
sary clean threads.
7. Install the fill cap and tighten the cap hand tight.
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8. Remove the cartridge guard from the dry chemical
tank and remove the cartridge.
9. Insure that the cartridge puncture pin is fully re-
tracted.
10. Weigh the new cartridge. The weight must be within
0.25 ounce (7.0 grams) of the weight stamped on
the cartridge.
11. Screw the new cartridge onto the actuator assem-
bly, hand tight.
12. Replace the cartridge guard and install the dry
chemical tank into its bracket.
13. Connect line at the bursting union, and line at the
tank actuator.
14. Remove the cartridge guard from the remote ac-
tuators and replace the cartridges.
15. Replace the cartridge guards, and install ring pins
on the push buttons.
16. Inspect hose, fittings and nozzles for mechanical
damage. Replace all hose that has been exposed
to fire areas.
17. Clean the nozzles and repack the openings with
silicone grease or install blow-off caps. Use caps
for new designed nozzles shown in Figure 2.1-2.
Fire Control System M02004