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TM 5-4210-220-12
Table 4-1. Unit PMCS - Continued
W - Weekly
M - Monthly
S - Semi-Annually
M - Monthly
B - Bi-Annual
ITEM
ITEM TO BE INSPECTED/PROCEDURE
NO.
W
M
S
A
B
Inspect water pump body for cracks or excessive wear. Check priming
hoses for leaks or wear. Refer to Direct Support if any are found. Check
fuel tank cooling fan operates while pump is operating in structural
mode.
17
FOAM SYSTEM:
Operate foam system with known flow of agent though nozzle and foam
meter set for 3% solution. Check foam mix is 3% by discharging tank
of water (660 gallons) and measuring amount of foam used. Should be
20 gallons. May use a dye solution to check calibration rather than foam
concentrate. With foam tank empty, set up foam system for flushing
but open foam tank valve. Ensure no water backfeeds to foam tank
Replace check valve if it does not seat.
18
Check all pipe/hoses for leaks while fire pump is operating. Set up
structural flow of 500 gallons/minute at 250 psi. Close discharge valves
slowly. Ensure engine speed decreases quickly and pump pressure does
not exceed 280 psi before levelling out at 250 psi. Open discharge
valves quickly and check pump pressure recovers to 250 psi within 5
seconds.
19
AUTOMATIC PRESSURE RELIEF VALVE:
With pump operating, close discharge valves quickly. Be sure pressure relief
valve on discharge manifold in pump body opens at 275 psi and pump
pressure does not exceed 280 psi. Replace relief valve as required. Refer to
paragraph 4-18.
20
TURRETS:
Set truck in pump-and-roll mode and check discharge pressure is 250
psi when secondary air pressure is in excess of 85 psi. Adjust air
regulator on brake pedal plate as required to obtain 250 psi pump
pressure. While discharging, check operation of turrets and inspect
housings for leaks.
21
WATER PIPE DRAIN VALVES:
When discharge stops, check turret heads drain automatically, replace
automatic drain valves as required.
Check operation of all pipe and pump manual drain valves.
4-11
Interval
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