FIREFIGHTING OPERATIONS-continued

TM 5-4210-233-14&P-1

2-13. FIREFIGHTING OPERATIONS-Continued

(5) Depress brake pedal and move truck transmission selector lever into D (drive).

CAUTION

Do not put truck transmission selector lever in R (reverse)

position. Damage to water pump will result.

NOTE

If the green OK TO PUMP light does not illuminate, or a grinding

noise occurs, move the transmission selector lever back to N

(neutral) position, pause for several seconds and move the

selector lever to D (drive) position.

NOTE

When pump is engaged, truck speedometer should indicate

approximately 18 MPH.

(6) Turn RELIEF VALVE lever to ON position and rotate INCREASE/DECREASE handle to obtain

desired pump output pressure.

(7) Open discharge valves slowly and accelerate engine with THROTTLE control on pump panel to

obtain desired discharge pressure and capacity.

CAUTION

Monitor engine coolant temperature. If the temperature exceeds

210 deg. F (99 deg. C), or the alarm sounds, open ENGINE

COOLER control valve gradually until temperature stabilizes at

200 deg. F (93 deg. C). Failure to heed this caution may cause

engine damage.

Do not attempt to pump more water than is available from

hydrant or relaying pumper. Always make sure compound-

gauge reading stays above zero. Some fire departments

operate at a minimum suction pressure of 1O psi (69 kPa) when

pumping from a hydrant or in relay to prevent a "soft" suction

hose from collapsing.

Priming the Pump.

(1) Start the engine (see para 2-12).

(2) Engage the water pump transmission (see para b. above).

CAUTION

Do not run the primer motor for longer than 30 seconds. Stop

priming operation and allow priming motor to cool for 1 minute

before operating primer again. Damage to primer motor may

result.

2-49