OPERATING FROM DRAFT.

TM5--4210-224-14&P

2-20. OPERATING FROM DRAFT.

Position fire truck as near to water source as possible.

CAUTION

Fire pump will heat up rapidly if pump is operated with all discharge valves closed. Prolonged

operation will cause damage from overheating.

Attach strainer to the other end of the suction hose and submerge in water source.

Engage fire pump as described in paragraph 2-15.

Prime fire pump as described in paragraph 2-16.

NOTE

If possible, submerge the strainer at least two feet below the surface of the water and keep the

strainer off the bottom. Use every precaution to keep sand, leaves, or other foreign material

away from the strainer to prevent restriction of flow. Make sure suction connections are tight.

AVOID BUMPS OR SHARP BENDS IN SUCTION HOSE. Make sure no part of hose is higher

than pump suction inlet. Air pockets in suction hose will cause loss of prime, or erratic pump

action, which will reduce pump capacity.

Pull open desired discharge valve control(s).

Turn engine throttle control knob (3, figure 2-1) counterclockwise to accelerate engine until master pressure

gauge (9) indicates desired discharge pressure.

Turn heat exchanger control switch (20, figure 2-1) to the "ON" position.

Turn pressure relief control knob (12, figure 2-1) counterclockwise to decrease pump discharge operating

pressure, clockwise to increase pump operating pressure.

NOTE

Periodically check engine temperature gauge (1, figure 2-1) for normal engine-operating

temperature range of 100F (55.5C) to 250F (138.8C).

Change 1 2-51