4-4. INTRODUCTION - Continued
Main Engine Test Continued
(7) Set Mode switch in cab to STRUCTURAL. Adjust engine speed to 1200 rpm via throttle on the structural
(8) Check receptacles on both sides of hose body (110V, 60 Hz) and lower engine speed to low idle.
Visually inspect engine and transmission for signs of leakage (coolant, fuel, or oil).
Open drain valves on all air reservoirs and drain all condensate.
Set transmission shift to "1", release parking brake and drive vehicle at low speed, checking operation of
brakes, steering, and throttle.
Check operation of 4-wheel drive and differential lock selectors.
Check operation of all transmission gear ranges.
Fire Pump and Turret Test
Set mode switch to CFR.
Engage transmission in range 2.
Start fire pump and check pump discharge pressure exceeds 250 psi. Refer to para. 2-11.
Check operation of bumper turret in the stationary, and pump-and-role-mode. (Ten second bursts are
sufficient) Maximum truck speed is 30 mph (50 kph).
Check operation of roof turret in the stationary, and pump-and-role-mode. (Ten second bursts are
sufficient). Maximum truck speed is 30 mph.
Repeat 5 and 6 with foam by setting tank valve open and foam control valve to a setting between 0 and 9.
Leave engine running, but vehicle stationary and parking brake applied.
Flush the foaming system (Refer to para. 2-13).
Structural Firefighting Test
Set Mode switch to Structural.
Control discharge pressure of pump using hand throttle on the Structural Control Panel. Refer to para. 2-
Check operation of both cross-lay hoses and hose reel.
Check operation of all structural hoses and other fire equipment .