Komatsu 830E-AC Shop Manual page 797

The fire control system aids in protecting the
machine in the event of a fire. The system consists
of:
• Actuators
• Pneumatic Actuator/Cartridge Receivers
• Pressure Relief Valve
• Check Valves
• Dry Chemical Tanks
• Hoses And Nozzles.
When either actuator is depressed, a nitrogen car-
tridge will pressurize the dry chemical tank. Once the
dry chemical tank has pressurized to a sufficient
pressure, a bursting disc in the tank outlet will break,
allowing the fluidized chemical to flow to the nozzles.
The nozzles will direct the agent at the fire and extin-
guish the flames.
FIGURE 2-1. FIRE CONTROL SYSTEM
1. Cab Actuator
2. Remote Actuator
3. Safety Relief Valve
4. Check Valves
M02005
FIRE CONTROL SYSTEM (MANUAL)
5. Actuator Receiver
6. Cartridge
7. Bursting Disc Union
8. Dry Chemical Tank
Fire Control Systems
Operation
To actuate the fire control system, pull the safety ring
on either of the actuators and depress the lever. One
actuator is located in the cab near the operator.
Another actuator is located on the left fender struc-
ture near the bumper.
NOTE: Operating either actuator will activate fire
control system.
Inspection and Maintenance
It is imperative that the fire control system is
inspected at least every six months. To ensure that it
will operate effectively:
1. Check the system for general appearance,
mechanical damage and corrosion.
2. Inspect each chemical tank fill cap gasket for
damage and replace if necessary. Examine cap
for nicks, burrs, cross threading or rough edges.
3. Check the level of dry chemical. The level
should not be less than three inches (76 mm)
from bottom of fill opening. Dry chemical must
be free flowing, with no caking.
4. Insure that the vent in the fill opening threads is
not obstructed.
5. Remove the cartridge from the extinguisher and
examine the disc-seal. Replace seal if neces-
sary. Install cartridge hand tight.
FIGURE 2-2. NOZZLE AND BLOW-OFF CAP
M2-3