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TM 5-4210-233-14&P-1
Table 5-2. Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
FIREFIGHTING SYSTEM - Continued
5
PRESSURE WILL NOT RETURN TO ORIGINAL SETTING AFTER DISCHARGE VALVES
ARE RE-OPENED
Pilot valve sticking.
Disassemble and clean (see para 4-36). Replace noticeably worn parts.
6
HUNTING (FLUCTUATING PRESSURE)
Sticky pilot valve or faulty relief valve.
Disassemble and clean (see para 4-35 and 4-36). Replace worn parts.
7
AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE
Step 1. Aerial discharge valve failed in open or closed position.
Remove pneumatic actuator and use a wrench on the valve shaft to open or close the valve
manually. If the valve does not move freely, replace the valve (see para 4-199).
Step 2. Pneumatic actuator defective.
Replace actuator (see para 4-200).
Step 3. Pneumatic actuator switch defective.
Replace pneumatic actuator switch (see para 4-179).
HYDRAULIC SYSTEM
1
OUTRIGGERS WILL NOT OPERATE
Step 1. Check power take-off operation.
Refer to hydraulic component testing (see para 5-50).
Step 2. Main hydraulic pump not operating.
Refer to hydraulic system component testing (see para 5-50).
Step 3. Pressure reducing (de-stroking) valve malfunctioning.
Refer to hydraulic system component testing (see para 5-50).
Step 4. Diverter valve malfunctioning.
Replace diverter valve (see para 4-193).
5-23
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