With regular use of a pressure washer, high-quality maintenance of the device in a service center is required. In order to save money, many users repair Karcher with their own hands. It is not recommended to clean and replace parts yourself before the end of the warranty period, which will affect the denial of further service.
Maintenance
For trouble-free operation of the device, regular replacement of oil, seals and cuff on the pump (high pressure pump) is required. In the event of interruptions in water pressure or improper storage / use of the device, an urgent do-it-yourself repair of Karcher may be required. What parts fail?
- Pump, motor and pressure sensor.
- Electrical.
- Nozzle, hose and gun.
The choice of household mini-sinks excludesthe occurrence of difficulties in care, but different models have their own characteristics, which must first be obtained from the seller. For example, a car wash nozzle with a lamellar structure will ensure high-quality operation with regular cleaning with a toothpick. Otherwise, the entry of small particles will cause the unit to stop working.
When purchasing a product, you should check the availability of the nearest service centers and the warranty period. If such issues are overlooked, the breakdown of the device will lead to unnecessary problems. If you decide to repair the Karcher with your own hands, the right step is to study the instructions in detail.
Causes of failure and recommendations for elimination
According to the manufacturer and employees of car washes, the main reasons for the breakdown of the device are poor water quality and lack of after-sales service. To increase the service life of the unit, you must comply with the basic requirements:
- Install a filter device for coarse and fine water cleaning at the inlet to the AED.
- Check the flow of the required volume of liquid according to the technical indicators of the device. For example, if the fluid flow is 15 l / min., And the water supply allows you to get 13 liters, after 2 months you may need to immediately repair the Karcher with your own hands (or at a service center).
- Water pipes should be 3/4" per unit.
- Factory nozzles and accessories are subject to self-replacement.
With regular prophylaxisyou can eliminate the occurrence of unforeseen circumstances that will entail the replacement of expensive parts.
AVD Service
Recommendations from experts:
- Checking the condition and regular oil change in the pump plunger drive device. According to the manufacturer, the first oil change should be carried out after 50 hours of using the device, the subsequent service - after 350-550 hours. With average throughput indicators of the washing area, it is enough to carry out treatment once every 3 months.
- Monitoring the condition of the pump for a good flow of liquid, external application of oil, as well as minor repairs to the Karcher car wash with your own hands (changing filters, tightening bolts) will extend the life of the device.
When is an AED repair required?
Repair is required if there is a decrease in pump performance and a decrease in operating pressure. This is caused by fluid leaking through the plunger seals. Wear of oil seals is produced naturally or when exposed to abrasive elements. Under high pressure, small scratches will affect fluid seepage.
The first signal of a malfunction is a small puddle formed in the place where the hose runs. To resolve the issue, you cansimple, but painstaking do-it-yourself Karcher car wash repair. It is enough to change the seals (seals). More difficulties will cause the installation of a new drive, housing elements, seals, etc.
The suction channel is formed by body elements placing a flat filter between them. The efficiency of the device depends on its condition. The formation of defects in the fit of the surfaces of body parts leads to a decrease in the main characteristics of the device. With low suction power while working with a hose and nozzles, do-it-yourself repair of a Karcher high-pressure washer requires the preparation of a soft material to clean all surfaces and ribs of body parts. Damaged items must be replaced.
Additional aspects
If the device is equipped with a Total Stop system (shutdown of the pumping system when there is no pressure on the gun trigger), leaks will lead to involuntary activation - the automatic device perceives a decrease in pressure as a start command, the device rattles.
The decrease in performance or shutdown of the AED is affected by the wear of the bypass or bypass valve, the rubber seal (ring) of the pressure sensor and the failure of the hose. This is accompanied by a low level of pressure of the gun, a decrease in the density and washing characteristics of the jet.
Descale
If the device does not maintain the set pressure level, the pump works intermittently and the water is supplied in fragments, do-it-yourself repair of the Karcher high-pressure washer will not bespecial difficulties. It is enough to unscrew the bolts with a screwdriver and remove the housing, get the motor with the pump and separate the engine from it. The pump must be directed upwards, otherwise oil will leak from the piston drive.
The valves are removed from the piston (the use of sharp objects is excluded, which can damage the surface), the pump is disassembled into 2 parts. The valves are removed again.
So it turns out the reason for the failure of the device. It could be scaling or clogging. All parts in the inside of the pump are cleaned and wiped with felt. Then the design is assembled in reverse order.
Repair of the sleeve in / d
Do-it-yourself repair of the Karcher high-pressure hose consists in crimping the damaged element at the ends or along the entire length. If the hose is torn off the flange, the unusable part should be cut evenly to an area where there are no deformations. The required flange is selected and placed on the hose. The first must be inserted into the second and compressed in a vice. Hammer strikes from above.
If a cut is formed along the length of the sleeve, similar work is done. The hose is cut and removed to an undamaged section. A connector of a given diameter and two clamps are inserted. They are put on the hose, the connector is inserted, tightly crimped with clamps. If cracks form along the entire length of the sleeve, do-it-yourself repair of the Karcher high-pressure hose is not possible. A complete replacement of the product is required - it is better to entrust this to the masters of the service center.
Cleaning foam nozzle tablet
If the foam nozzle stops producing thick foam, is used for a long time or is not washed with clean water after use, the mesh in the form of a shaft becomes clogged with dried "chemistry".
To clean the foam tablet, a number of operations must be performed:
- Disconnect the tank from the main frother unit.
- The arrow indicates the location of the pin holding the plastic tip of the tablet on the brass element. The pin should be knocked out. If you decide to repair the Karcher foam nozzle with your own hands, you can use an awl or a thin screwdriver.
- After removing the plastic tip, you will see two petals forming the foam spray angle. The tip with them must be unscrewed.
- In the inside of the removed nozzle, steel threads will be visible, taking a rounded shape (in the form of a tablet). They should be removed with an awl. Cleaning of the hardened "chemistry" in the nozzle is carried out with a needle.
- Assemble the product in reverse order.
Properly repaired do-it-yourself Karcher nozzle allows you to extend the life of the device and reduce maintenance costs.
Motor failure
| Breakdown | Possible cause | Ways to solve the problem |
| Motor not working | Low mains voltage | Voltage check in progressin the network and the correct connection of the plug |
| Extension cable damaged | Connecting the machine without an extension cable | |
| Motor protection relay activated | Drug turns off for 15 minutes | |
| Motor is noisy but no kickback | Voltage reduction when using an extension cord | The extension cord is disconnected |
| Low mains voltage | Do not rush to repair Karcher mini-washers with your own hands. Initially, you need to check the compliance of nutrition with the recommended indicator | |
| Motor stops | Wrong mains voltage | The mains power is determined and compared with the data on the tag |
| Motor protection relay activated | The machine needs to cool down for 15 minutes |
What else affects engine performance?
The lack of preventive inspection of the main elements of the device can cause a number of additional problems associated with engine breakdown.
| Breakdown | Possible cause | Ways to solve the problem |
| No pressure | Clogged gun nozzle | Nozzle cleaning required |
| Water supply valve closed | Check the fluid supply, if necessary, make a quality repair of the Karcher hose with your own hands. | |
| Filter clogged | Filter being cleaned and replaced | |
| Random motor start | Absencetightness of pump, gun | Parts are being replaced (see example above). |
If you have any difficulties in identifying a breakdown, it would be right to turn to professionals. Many users mistakenly establish the cause of the breakdown and repair the Karcher pump with their own hands during jerky operation. The real reason may be low water pressure or low voltage.
Replacing the bearing
The need to replace the bearing may be caused by intermittent operation, noise from the inside and overheating of the motor. The reason sometimes lies in interturn short circuits or a failed bearing. In the first case, you need to separately start the engine and check its operation. If no violations are found, further repair of the Karcher sink with your own hands is easy to do in a few steps:
- The hose with the gun is unscrewed, the body is disassembled and the engine with the cylinder head is taken out.
- 6 screws are unscrewed and the block with the switch is opened, the capacitor and 2 power terminals connected to the switch are disconnected.
- The unit is placed on a stand in a perpendicular position (the motor is located below), 4 bolts are unscrewed by 13.
- After draining the oil, a thorough inspection of the ball cage can be done.
- The middle bolt is unscrewed with an asterisk screwdriver. To do this, the shaft is clamped from the back with a gas key.
- The inner bearing is being replaced, acting as a support for the swash plate that presses the valves.
Oil change
The whole process of changing the oil is carried out in several stages:
- A container is being prepared to hold 1 liter of oil.
- A receiving tray is being prepared.
- The drain plug is being removed.
- Receiving tray drains oil into the collection tank.
- The drain plug is being tightened.
- Slowly fill oil to the MAX mark. Air bubbles will escape on their own.
The type of oil and the amount of filling can be found in the technical characteristics of the device. Waste fluid is disposed of in an environmentally friendly way or handed over to a collection point.
When determining the causes of malfunctions that affect the performance of the unit, special attention is paid to the purchase of spare parts, because some of them cost the price of the device itself.
