I. Common Faults and Repairs of High-Pressure Cleaning Machines
1. Abnormal screeching sound during operation
The main reason for this phenomenon is insufficient lubrication of the motor bearings. We need to inject ordinary grease into the lubrication hole of the motor in a timely manner. This phenomenon is not common, and we can simply replenish the grease during regular maintenance and inspection of the high-pressure cleaning machine.
2.Unstable Pressure in the High-Pressure Washer
Unstable pressure in the high-pressure washer is mainly caused by air being drawn into the high-pressure water pump or the water inlet pipe. When dealing with this issue, whether you are using a standard vehicle washing gun or a specific cleaning gun car wash attachment, you need to check if the water source pressure is sufficient and if the water inlet filter is clogged. If the inlet filter is clogged, simply remove the filter and clean it with water.
3.Pressure Drops After Running for a Period of Time
If the pressure of the high-pressure washer drops after running for a period of time, you should first check if the high-pressure nozzle is severely worn. High-pressure nozzles in standard pressure equipment generally do not experience wear, as the high-pressure nozzles we provide have been heat-treated. This applies to all components, including the primary car wash machine gun. However, this cannot be guaranteed for very high-pressure equipment. Secondly, you need to check the pressure regulating valve and the internal sealing components of the water pump.
4.Abnormal Noise from the High-Pressure Water Pump
Abnormal noise from the high-pressure water pump is caused by air being drawn into the pump, or by a damaged flow valve spring or damaged crankshaft bearing. If this occurs, contact the manufacturer for assistance with repairs.
5. Crankcase lubricating oil becomes cloudy or milky white
During regular maintenance and inspection of the high-pressure cleaning machine, if the crankcase lubricating oil is observed to be cloudy or milky white through the sight glass, it indicates that the oil seal in the high-pressure water pump is not properly sealed or is damaged. If not replaced in time, impurities in the water will severely damage the service life of the crankshaft and connecting rod, resulting in complete damage to the high-pressure water pump.
6. Oil leakage from the bottom of the high-pressure water pump
Oil leakage from the bottom of the high-pressure water pump is due to damage to the oil seal inside the pump. This requires timely replacement. When the high-pressure water pump is operating, the crankshaft and connecting rod are constantly moving back and forth, and lubrication and cooling are provided by the oil. Therefore, the high-pressure water pump cannot lack lubricating oil.
7. Pressure regulating valve pressure is normal, but the high-pressure water gun does not spray water.
During use, you may encounter situations where the pressure regulating valve pressure is normal, but the high-pressure water gun does not spray water, or the water jet from the high-pressure nozzle is irregular and scattered. This indicates that the high-pressure nozzle is blocked by foreign objects and needs to be removed and cleaned.
II. How to maintain and service a high-pressure cleaning machine
1. High-pressure cleaning machine maintenance is divided into three levels:
a) The first level is daily maintenance performed by the operator, including regularly checking the normal working condition of all components, ensuring that all connecting parts and fasteners are correctly and properly installed, and ensuring that there are no faulty components in the equipment.
b) The second level involves regularly checking components such as valves, connectors, and spray guns. This work can be performed by the operator under the guidance of professional technicians according to standard maintenance procedures.
c) The third level involves the overhaul of the pump and important components of the equipment. This work must be carried out according to the prescribed procedures and should comply with the requirements of the equipment manufacturer, and must be completed by professional technicians.
2. High-pressure cleaning machine maintenance procedures
The equipment maintenance procedures must specify the wear parts of the equipment; special maintenance checks should be performed on the jet components during equipment assembly before cleaning operations and during equipment disassembly after cleaning operations to ensure their normal operation. All connecting threads and other internal parts that the operator cannot normally observe should be checked each time; the complete set of equipment should be inspected and undergo necessary routine maintenance at least according to the manufacturer’s requirements.
3. Power equipment
The power equipment must be checked daily to ensure a normal supply of fuel, oil, medium, and cooling water; belts should be properly tensioned and free from peeling, cracking, or other damage; all protective devices should be safe, reliable, and undamaged. The control cables and prime mover control devices must be checked daily.
4. Water intake
Before starting the machine, check the low-pressure water inlet pipeline of the pump. The high-pressure pump can be equipped with a pre-pump to ensure a certain water pressure and appropriate flow rate; during operation, there should be sufficient water supply from the water tank, and the water tank should be free of rust and dirt. The filter must be checked regularly to ensure that it is not blocked or damaged. When checking and replacing the filter, prevent solid particles from entering the pump and nozzle through the water inlet pipe. The filter mesh accuracy and filtration area should be compatible with the equipment’s requirements for water quality and quantity. 5. Hose Assembly
The hose and fittings are crucial to the operation of the equipment. Inspect them for broken wires on the outside, damage caused by crushing or abrasion, and bulging due to internal rupture.
Hoses wound on the reel should not be excessively bent to prevent kinking or damage; the reel should have sufficient lubrication and good sealing to ensure normal operation.
6. Nozzle
Before installation, flush the equipment piping with water to ensure that the nozzle is not blocked or damaged, and that the nozzle connection threads are intact and undamaged. All damaged jet parts must be repaired or replaced before operation.
7. Valves
Before operation, all control valves, pressure regulating valves (overflow relief valves), and safety valves must be inspected to ensure they are clean and functioning properly. Regularly test and inspect all valves and promptly repair or replace any damaged parts.
8. Electrical Equipment
Special protection should be provided for electrical equipment. Before operation, all electrical boxes, connectors, knobs, cables, and instruments must be checked for damage. This inspection should be performed daily to ensure that they are not damaged by water or abrasives during operation. All electrical connections must be properly secured. After initial wiring or rewiring of the motor, its rotation direction must be checked.
9. Trailer
Before each operation, check the trailer’s supports, connections, and wheels (tires) to ensure they are in good working order.
10. Special Tools
High-pressure components should be assembled and disassembled using special tools provided and recommended by the manufacturer.
11. Anti-freezing Measures
When the equipment is used in cold environments, anti-freezing measures must be implemented. Specifically, remove the spray gun (nozzle), insert the water outlet pipe into the water supply tank, and start the machine to circulate the antifreeze through the equipment piping.
If the water in the pump or hose has frozen, the pump unit must be thawed before removing the spray gun (nozzle) and allowing low-pressure water to flow through the equipment to ensure there is no ice residue before restarting.