
The ISUZU foam fire truck, as specialized firefighting equipment, excels in its highly efficient foam suppression system. Compared to water tank fire trucks, while retaining the basic water tank structure, it is additionally equipped with key components such as a foam liquid tank, air-foam proportioning system, and foam-water monitor, forming a unique foam firefighting capability. To maximize the effectiveness of these systems, operators must master standardized operating procedures and understand troubleshooting methods for common issues. Below, we will provide a detailed analysis of the professional operation methods for the ISUZU foam tanker fire truck, covering both operational steps and typical troubleshooting approaches.
Operation of the ISUZU Foam Tender Fire Truck
1. Foam Liquid Refilling
There are two methods to refill the foam liquid tank in an ISUZU foam fire engine:
Steps for compressed air transfer:
① Connect the suction tube, air charging nozzle, and tire inflation hose with adapters.
② Start the engine to ensure sufficient air pressure in the truck's air reservoir.
③ Close the foam proportioner and open the foam tank inlet valve.
④ Connect the air hose to the charging nozzle to introduce compressed air into the foam drum.
⑤ The foam liquid is pushed into the foam tank under air pressure.
⑥ Once the drum is empty, immediately shut off the air release valve and foam tank inlet valve to prevent excessive air intake.
2. Foam Firefighting Operations
(1) Internal Foam Suction (Tank Supply)
Foam is drawn from the onboard foam tank via the proportioning system.
Steps:
① Connect hoses, foam guns, or monitors as needed. For medium/high-pressure hose reels, install the dedicated foam attachment.
② Set the foam gun selector to "mixed solution" or "water" position.
③ Start the water pump (refer to water tank truck operations).
④ Open the pressure water valve leading to the foam proportioner.
⑤ Increase engine throttle to adjust pump pressure based on foam gun/monitor requirements.
⑥ Rotate the proportioner valve to align with the foam gun’s calibrated orifice setting.
⑦ Open the foam inlet valve—the proportioner will continuously draw foam at the set ratio.
(2) External Foam Suction (Drum Supply)
Foam is drawn from an external drum via the proportioner.
Steps:
① Close the foam tank inlet valve, open the T-pipe cap, and connect an external suction tube to the drum.
② Open the drum’s air vent, then follow internal suction steps.
(3) Self-Suction Foam (Direct Gun Supply)
Foam guns directly draw from drums via a suction tube.
Steps:
① Connect one hose end to the pump outlet and the other to the foam gun. Insert the suction tube into the drum.
② Open the drum’s air vent.
③ Set the foam gun to "suction" mode and proceed as above.
Post-Operation: Always flush the pump, proportioner, foam guns, and piping after use.
Common Foam System Faults & Troubleshooting
ISUZU foam tender fire trucks may encounter two primary issues:
Fault Type 1: No Foam Discharge
Possible Cause |
Solution |
① Foam proportioner closed |
① Open proportioner |
② Water pressure >0.049MPa, blocking foam suction |
② Use water source <0.049MPa |
③ Clogged foam tank vent |
③ Clear blockage |
④ Closed air charging nozzle |
④ Open nozzle |
⑤ Blocked/closed foam line valve |
⑤ Open valve or clear obstruction |
⑥ Loose/damaged suction tube gasket |
⑥ Tighten or replace gasket |
Fault Type 2: Poor Foam Quality
Possible Cause |
Solution |
① Proportioner setting mismatch |
① Adjust valve to rated orifice |
② Clogged gun/monitor air inlet |
② Clean inlet |
③ Damaged foam screen |
③ Repair/replace screen |
④ Degraded foam liquid |
④ Replace with certified foam |
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