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CuteNaija
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Friday, April 24, 2026
Water tank fire trucks play a critical role in firefighting operations, ensuring a stable and immediate water supply during emergencies. However, during long-term use, performance degradation or system failures may occur due to improper operation, insufficient maintenance, or natural wear and tear. To ensure optimal performance and operational reliability, regular maintenance and timely troubleshooting are essential.
1. Maintenance of Water Tank Fire Trucks
Proper maintenance is the foundation for keeping a fire truck in peak working condition. Among all components, the centrifugal pump and priming system require particular attention.
(1) Centrifugal Pump and Priming Device Maintenance
1. Lubrication
Lubrication is essential for ensuring smooth pump operation and reducing wear:
After every 4–6 hours of cumulative operation, check the gearbox oil level (if applicable). Refill immediately if the oil level has dropped.
Use No. 18 hypoid gear oil as the recommended lubricant.
Before operating the pump, inspect the oil level in the drive shaft bearing housing. Remove the oil level plug and fill oil through the inlet until it flows out of the level hole, then tighten the plug securely.
It is recommended to replace the pump lubricating oil once per year.
Apply grease regularly to the rear and middle supports of the pump shaft to ensure smooth rotation and prevent damage.
2. Drainage After Operation
After each use:
Drain all residual water from the pump and pipeline to prevent corrosion and freezing damage.
Cover the inlet and outlet ports with protective caps.
Apply grease to threaded connections to prevent rust and ensure easy disassembly.
3. Cleaning and Inspection
Regularly remove carbon deposits from the exhaust priming device.
Clean the water ring pump and its water tank monthly and replace with clean water.
Ensure sufficient lubricating oil is maintained in the oil tank of piston-type or sliding-vane priming pumps.
4. Winter Protection
During winter, antifreeze should be added to the water tank of the water ring pump.
The antifreeze solution is typically a mixture of water and alcohol, prepared according to standard ratios to prevent freezing and ensure reliable operation in low temperatures.
2. Common Faults and Troubleshooting of Water Tank Fire Trucks
Priming device cannot reach maximum vacuum
Poor friction wheel engagement
Adjust
Priming device cannot reach maximum vacuum
Insufficient water in the tank
Refill
Vacuum gauge shows no vacuum or very low vacuum
Poor sealing in suction pipeline
Inspect and fix leaks
Vacuum gauge shows no vacuum or very low vacuum
Priming device malfunction
Repair
Vacuum gauge shows no vacuum or very low vacuum
Strainer exposed above water surface
Submerge into water as required
High vacuum reading but no water intake
Strainer check valve stuck
Clear blockage
High vacuum reading but no water intake
Damaged suction hose
Replace
High vacuum reading but no water intake
Pump inlet blocked
Clean
High vacuum reading but no water intake
Excessive suction depth
Reduce suction depth
High vacuum reading but no water intake
Strainer clogged with debris
Clean
Low discharge pressure with high vacuum
Suction pipeline blocked
Clean
Low discharge pressure with high engine speed
Flow exceeds pump rated capacity
Reduce flow rate
Low discharge pressure with low engine speed
Engine malfunction
Inspect and adjust
Decreasing discharge pressure with increasing vacuum
Gradual blockage in suction pipeline
Clean
Pump operates normally but pressure gauge shows no reading
Pressure gauge damaged
Replace pressure gauge
Pump operates normally but pressure gauge shows no reading
Pressure gauge passage blocked
Flush the gauge passage
Water discharge interrupted, pressure gauge needle fluctuates, engine speed increases
Insufficient submersion depth of suction hose causing vortex and air intake
Submerge strainer properly
Water discharge interrupted, pressure gauge needle fluctuates, engine speed increases
Engine malfunction
Inspect and adjust
No pressure reading, engine speed high
Strainer exposed above water surface
Submerge into water
No pressure reading, engine speed high
Loose suction hose connection
Reinstall and tighten
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