The maintenance of water jet propulsion pumps includes daily inspection, regular maintenance, cleaning after use and long-term idle protection. Daily inspection involves cleaning and inspection of the appearance, water inlet and nozzle; regular maintenance includes condition monitoring and lubrication of the impeller, bearings, seals and motors; drainage and cleaning are required after use; rust and moisture-proof treatment should be carried out when idle for a long time to ensure that the equipment remains in good condition and prolongs its life. These measures help water jet propulsion pumps operate efficiently and safely, and are suitable for a variety of scenarios such as ships and amphibious vehicles.
Daily inspection
Appearance inspection
Check the overall appearance of the water jet propulsion pump regularly (recommended daily or before each use) to check for obvious damage, deformation, cracks or corrosion. Pay special attention to the water inlet pipe, water outlet pipe, nozzle, pump body shell and other parts.
Check whether the mounting bolts and nuts are loose. If they are loose, they should be tightened in time to ensure that all parts are firmly connected.
Water inlet inspection
Check whether the water inlet grille is intact and whether there is any debris blocking it. If the grille is damaged, it should be repaired or replaced in time to prevent larger objects from entering the propulsion pump and causing damage.
Clean up the water plants, garbage and other debris that may be accumulated around the water inlet, keep the water inlet unobstructed, and ensure that water can be smoothly sucked into the pump.
Nozzle inspection
Check whether the nozzle is blocked by foreign objects, and if so, clean it in time. A blocked nozzle will affect the speed and direction of the water spray, thereby reducing the performance of the propulsion pump.
Check whether the shape of the nozzle remains normal and whether there is any deformation or wear. If the nozzle is found to be deformed, the nozzle component may need to be replaced to ensure the water spraying effect.
Regular maintenance
Impeller inspection and maintenance
Disassemble the propulsion pump regularly (generally every certain running time or months) and inspect the impeller according to the equipment manufacturer’s recommendations.
Check whether the impeller is worn, deformed, cracked or corroded. Severely worn impellers will reduce the ability to pressurize water and affect propulsion efficiency. At this time, the impeller should be replaced.
Clean the scale and debris attached to the impeller. You can use appropriate tools (such as soft brushes) to gently brush them off, but be careful to avoid damaging the impeller surface.
Bearing inspection and maintenance
Check the lubrication of the bearings to ensure that there is enough lubricating oil in the bearings. If the lubricating oil is insufficient, add lubricating oil that meets the equipment requirements in time.
Check whether the bearings have abnormal phenomena such as overheating, abnormal noise, and wear. If there are signs of overheating (you can feel the abnormal temperature rise by touching the bearing housing), it may be caused by insufficient lubrication, bearing damage or excessive load, and further investigation and solution are required.
Regularly replace the bearing lubricating oil to ensure good lubrication and normal operation of the bearing. The replacement cycle depends on the equipment operation and the manufacturer’s recommendations, generally ranging from several months to one year.
Seal inspection and maintenance
Check the seals of the propulsion pump, such as shaft seals, sealing gaskets, etc., to see if there are any leaks. Minor leaks can be judged by observing whether there are water droplets or oil stains around the seals.
If the seal is found to be leaking, the seal should be replaced in time. Leakage will not only cause the performance of the propulsion pump to deteriorate, but may also cause water to enter the motor or other components, causing equipment failure.
When replacing the seal, make sure to use a sealing product that matches the equipment model and has reliable quality, and install it according to the correct installation method.
Motor (or other power source) inspection
For electric water jet propulsion pumps, check whether the motor wiring is firm, loose, burnt, etc. If a wiring problem is found, it should be repaired in time to ensure that the motor is powered normally.
Check the operating temperature of the motor, which can be detected by touching the motor casing (be careful to avoid burns) or using temperature detection equipment. The high operating temperature of the motor may be caused by overload, poor ventilation, motor failure, etc., which needs to be investigated and solved according to the specific situation.
Regularly clean the dust and debris on the surface of the motor to maintain good heat dissipation conditions for the motor. Poor ventilation will cause the motor temperature to rise, affecting the life of the motor and the normal operation of the propulsion pump.
Post-operation maintenance
Drainage treatment
After the water jet propulsion pump stops running, if the equipment may be idle for a long time, the water in the pump and the pipe should be drained to prevent the water from freezing in the equipment (in a low temperature environment) or breeding bacteria, algae, etc. (in a warm environment).
The water can be drained by opening the drain valve or using the drainage device of the equipment to ensure that the water is drained before closing the drain valve.
Cleaning treatment
Rinse the water inlet, nozzle and the outside of the entire propulsion pump with clean water, remove the mud, water grass and other debris attached during operation, and keep the appearance of the equipment clean.
For internal parts, such as impellers, pipes, etc., if conditions permit, a more thorough cleaning can be carried out regularly (such as every quarter or half a year), and appropriate cleaning tools and cleaning agents can be used, but care should be taken to avoid damaging the parts.
Long-term idle maintenance
Rust prevention treatment
If the water jet propulsion pump will be idle for a long time (more than one month), the equipment should be treated with rust prevention. Anti-rust oil can be applied on the surface of the equipment (be careful not to apply it to seals, bearings and other parts to avoid affecting their performance) to prevent the equipment from rusting.
For exposed metal parts, such as water inlet pipes and outlet pipes, they can be wrapped with anti-rust paper or plastic film for protection to reduce the impact of air and moisture on them.
Moisture-proof treatment
Ensure that the environment where the equipment is stored is dry and ventilated. Desiccant can be placed where the equipment is stored to absorb moisture in the air and prevent the equipment from getting damp.
If the equipment is stored in a humid environment, such as near the sea or basement, consider using equipment such as dehumidifiers to reduce the ambient humidity and ensure the health of the equipment.
Regular startup inspection
Even if the equipment is idle for a long time, the water jet propulsion pump should be started regularly (it is recommended to be started every three months or so) and run for a few minutes to check whether the equipment can start and run normally, so as to promptly discover and solve possible problems.
