Operating Aerial Discharge -706880086

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

2-14. AERIAL LADDER SET-UP - Continued

f. Operating Aerial Discharge.

(1)

Refer to paragraph 2-13 for appropriate pump setup instructions (pumping from draft, pumping

from hydrant or in relay, pumping from water tank).

(2)

With the engine at idle speed, select PUMP mode with ELECTRIC PUMP SHIFT switch on cab

dashboard.

(3)

Depress the brake pedal and shift the truck transmission into D (drive).

CAUTION

Do not put the truck transmission selector lever into R (reverse)

position. Damage to the water pump may 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 to D (drive) position.

(4)

When pump is engaged, truck speedometer should indicate approximately 18 MPH.

(5)

Open AERIAL DISCHARGE valve on pump operator's panel and set AERIAL DISCHARGE

OPEN/CLOSED switch on aerial platform to OPEN.

(6)

Turn the RELIEF VALVE lever to the ON position and adjust knob to obtain desired discharge

pressure.

CAUTION

Monitor engine coolant temperature. if the temperature ex-

ceeds 21 0 deg. F (99 deg. C), or the alarm sounds, open the

ENGINE COOLER control valve gradually until the tempera-

ture stabilizies at 200 deg. F (93 deg. C). Failure to heed this

caution my 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 10 psi (69 kPa) when

pumping from hydrant or relay to prevent a soft suction hose

from collapsing.

2-58