Product Name: High Pressure Cleaning Machine

　　Maximum power: 7.5KW

　　Rated voltage: 380V

　　Available voltage: 180-440V

　　Rated current: 11.5A

　　Theoretical pressure: 250BAR

　　Maximum flow rate: 18L/minute

　　Configure water pipe: 120-170 meters

　　Configure drone spray bar: 2-2.5 meters

　　Supporting nozzle: 4 types (direct 0 degrees, fan-shaped 15 degrees, 25 degrees, 40 degrees)

　　Section 1: Understanding Your High-Pressure Washer – Core Components and Their Care

　　Before diving into maintenance routines, it's crucial to understand the key components that require attention.

　　1.1 The Pump: The Heart of the System

　　The pump is the most critical and often the most expensive component. It pressurizes the water and is susceptible to damage from running dry, contaminated water, and pressure surges.

　　1.2 The Engine or Motor: The Power Source

　　Gasoline Engines: Require care for the air filter, spark plug, oil, and fuel system.

　　Electric Motors: Generally require less maintenance but need checks on cables, connectors, and ventilation.

　　1.3 High-Pressure Hose and Fittings

　　The hose carries pressurized water from the pump to the spray gun. It must be inspected for abrasions, leaks, and damage to prevent dangerous failures.

　　1.4 Spray Gun, Lance, and Nozzles

　　These components control the water's impact. Nozzles, in particular, are prone to wear and clogging, which can affect pressure and pattern, potentially damaging the pump.

　　1.5 Water Inlet and Filtration

　　The quality of inlet water is paramount. Sediment, minerals, and debris can rapidly degrade pump seals and valves.

　　Section 2: Daily and Pre-Use Maintenance – The Foundation of Reliability

　　Implementing these simple steps before and after every use will drastically improve your washer's reliability.

　　2.1 Pre-Operation Checklist

　　Inspect the Area: Ensure the work area is clear of tripping hazards and that the machine is on a stable, level surface.

　　Check Engine Oil (for gas models): Verify the oil level is within the recommended range. Top up with the manufacturer-specified oil type if necessary.

　　Inspect the High-Pressure Hose: Look for signs of wear, cuts, bulges, or leaks. Never use a damaged hose.

　　Verify Water Supply: Connect to a clean water supply with adequate flow and pressure. Fully turn on the water supply before starting the machine.

　　Check Inlet Filter: Ensure the inlet water filter is clean and free of debris.

　　Inspect Nozzles: Confirm the nozzle is clean, unobstructed, and appropriate for the task.

　　2.2 Post-Operation and Shutdown Procedures

　　Relieve System Pressure: Always trigger the spray gun to release all pressure from the hose and system before turning off the machine.

　　Flush the System: After use, especially with detergents or chemicals, run clean water through the system for 1-2 minutes using the low-pressure setting or a detergent siphon tube in clean water. This flushes out any residual chemicals or debris.

　　Disconnect and Store Properly: Disconnect from the water and power supply. Drain the high-pressure hose and store it coiled, not kinked, in a cool, dry place. Store the spray gun and lance securely.

　　Section 3: Periodic Inspection and Proactive Maintenance

　　Beyond daily routines, a scheduled maintenance plan is essential. Adhere to the intervals specified in your user manual, typically based on operational hours.

　　3.1 Pump Maintenance

　　Lubrication: Some pumps require periodic oil changes. Check your manual for the type and interval.

　　Unloader Valve: This valve controls system pressure and bypass. It may need cleaning or adjustment over time to maintain consistent pressure.

　　Check Seals and Valves: Listen for unusual noises and look for water leaks from the pump, which indicate worn seals or valves that need professional attention.

　　3.2 Engine Maintenance (Gasoline Models)

　　Air Filter: Clean or replace the air filter regularly. A clogged filter reduces efficiency and increases fuel consumption.

　　Spark Plug: Inspect, clean, and gap the spark plug according to the schedule. Replace it if worn or fouled.

　　Fuel System: Use fresh, stabilized fuel if the machine will be stored. Over time, the fuel filter may need replacement.

　　3.3 Electric Motor Care

　　Cable Inspection: Regularly check the power cord for cuts, abrasions, or damage.

　　Ventilation: Keep the motor's ventilation slots clean and unobstructed to prevent overheating.

　　3.4 Nozzle and Gun Inspection

　　Nozzle Wear: Even with clean water, nozzles wear out over time due to high-velocity water and abrasion from particles. A worn nozzle will produce an uneven spray pattern and cause a drop in impact pressure, forcing the pump to work harder. Compare the spray pattern to a new nozzle's pattern.

　　Gun Trigger and Safety Lock: Ensure the trigger action is smooth and the safety lock functions correctly.

　　Section 4: Troubleshooting Common Technical Issues

　　Even with excellent maintenance, issues can arise. Here is a guide to diagnosing common problems.

　　Issue 1: Loss of Pressure or Poor Performance

　　Possible Cause: Clogged or worn nozzle.

　　Action: Stop the machine, release pressure, and inspect the nozzle. Clean it with a fine pin (never a metal object that can damage the orifice) or replace it.

　　Possible Cause: Leak in the inlet water supply or a clogged inlet filter.

　　Action: Check all inlet connections and clean the filter.

　　Possible Cause: Worn or damaged unloader valve.

　　Action: This may require service from a technician.

　　Issue 2: Pump Not Building Pressure or Pulsating

　　Possible Cause: Air in the pump system.

　　Action: Ensure the water supply is fully on and the inlet connections are tight. Run the machine with the spray gun triggered to purge air.

　　Possible Cause: Worn pump seals or valves.

　　Action: This is a common sign that the pump requires professional service.

　　Issue 3: Engine/Motor Fails to Start

　　For Gas Engines: Check fuel level, fuel valve, spark plug connection, and engine ON/OFF switch.

　　For Electric Motors: Check the power source, circuit breaker, GFCI, and all connections. Ensure the thermal overload reset button (if equipped) has not been triggered.

　　Issue 4: Abnormal Pump or Engine Noise

　　Possible Cause: Low engine oil (gas models).

　　Action: Check and top up oil immediately.

　　Possible Cause: Cavitation – the pump is not getting enough water.

　　Action: Check water supply, inlet hose for kinks, and clean the inlet filter.

　　Possible Cause: Internal mechanical failure.

　　Action: Stop using the machine immediately and contact a service technician.

　　Section 5: Professional Technical Support and Service Intervals

　　While user maintenance is vital, some tasks require expert knowledge and specialized tools.

　　5.1 The Role of Professional Service

　　A certified technician provides services that are beyond the scope of standard user manuals:

　　Pump Rebuilds: Replacing internal seals, valves, and pistons to restore pump performance.

　　Thermal Relief Valve Testing: Ensuring this critical safety component functions correctly to protect the pump from overheating.

　　In-Depth Diagnostics: Using specialized equipment to diagnose electrical and mechanical issues accurately.

　　Major Overhauls: Comprehensive rebuilding of the entire machine for a second life.

　　5.2 Recommended Service Intervals

　　A general guideline based on usage intensity is as follows:

　　Light Use (e.g., occasional commercial use): Professional inspection annually or every 150-200 hours.

　　Moderate Use (e.g., daily business operations): Professional inspection every 6 months or every 100-150 hours.

　　Heavy/Industrial Use (e.g., multiple shifts): Professional inspection quarterly or every 50-100 hours.

　　Always defer to the specific service schedule in your operator's manual.

　　Section 6: Winterization and Long-Term Storage

　　Proper storage is crucial, especially in environments where freezing temperatures occur.

　　6.1 Protecting Against Freezing

　　Water left inside the pump can freeze, expand, and cause catastrophic damage. To winterize:

　　Disconnect the machine from power and water.

　　Add pump protector or RV antifreeze (non-toxic, propylene glycol type) to the system. Consult your manual for the correct procedure, which often involves siphoning the fluid through the chemical intake.

　　Start the machine and run it for a few seconds to circulate the antifreeze through the pump and hoses.

　　For added safety, drain all water from the high-pressure hose.

　　6.2 General Storage Tips

　　Store the machine in a clean, dry, and well-ventilated area.

　　For gas engines, either drain the fuel tank and carburetor or add a fuel stabilizer and run the engine for a few minutes to circulate the treated fuel.

　　Protect the unit from dust and direct sunlight.