With regular use of a high pressure washer, high- quality maintenance of the apparatus in a service center is required. In order to save money, many users make repairs of "Karcher" with their own hands. It is not recommended to conduct independent cleaning and replacement of parts before the end of the warranty period, which will affect the denial of further maintenance.
Service
For uninterrupted operation of the device, regular replacement of oil, seals and cuff on the pump ( high pressure pump ) is required. In case of interruptions in water pressure or improper storage / use of the device, urgent repair of the Karcher may be required. What parts fail?
- Pump, motor and pressure sensor.
- The electrical part.
- Nozzle, hose and gun.
The choice of household washing machines eliminates the difficulties in care, but different models have their own characteristics, which you must first find out from the seller. For example, a car wash nozzle with a plate structure will ensure high-quality operation with regular cleaning with a toothpick. Otherwise, the ingress of small particles will stop the operation of the unit.
When purchasing a product, the availability of the nearest service centers and the warranty period should be clarified. If such questions are missed, damage to the device will lead to unnecessary problems. If you decide to carry out the Karcher repair yourself, the right step is to study the instructions in detail.
Causes of breakdowns and troubleshooting tips
According to the manufacturer and car wash workers, the main reasons for the breakdown of the device are poor water quality and lack of service. To increase the life of the unit, the basic requirements must be observed:
- Install a filtering device for rough and fine cleaning of water at the entrance to the AED.
- Check the flow of the required volume of fluid according to the technical parameters of the device. For example, if the fluid flow rate is 15 l / min., And the water supply allows you to get 13 l, after 2 months you may need to immediately repair Karcher with your own hands (or in a service center).
- The diameter of the water pipe should be 3/4 inch per unit.
- Self-replacement are subject to factory nozzles and accessories.
With regular prophylaxis, unforeseen circumstances that would entail the replacement of expensive parts can be excluded.
Service AVD
Recommendations of specialists:
- 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 section, it is enough to carry out processing once every 3 months.
- Monitoring the condition of the pump for a good flow of fluid, external application of oil, as well as minor repairs of the Karcher car wash with your own hands (filter change, bolt tightening) will extend the life of the device.
- For AHD with heating, boiler prevention is mandatory - cleaning the fuel filter (descaling on the inner walls of the heat exchanger and external plaque).
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 leakage of fluid through the plug seals. The wear of the seals is done naturally or when exposed to abrasive elements. At high pressure, small scratches will affect fluid leakage.
The first signal of a malfunction is a small puddle formed at the location of the hose. To solve the problem, you can make a simple but painstaking repair of the Karcher car wash with your own hands. It is enough to change the seals (gaskets). More difficulties will be caused by the installation of a new drive, housing elements, seals, etc.
The suction channel is formed by housing elements that place a flat filter between them. The efficiency of the device depends on its condition. The formation of defects in the abutment of the surfaces of body parts leads to a decrease in the basic characteristics of the device. At low suction power during the work with the hose and nozzles, the repair of the Karcher high pressure washer do-it-yourself requires preparing soft material to clean all surfaces and edges of the body parts. Damaged items must be replaced.
Additional aspects
If the device is equipped with a Total Stop system (shutting down the pump system in the absence of pressure on the trigger of the gun), leaks will lead to an unintentional start-up - the automatic device perceives a decrease in pressure as a “start” command, the device rattles.
The deterioration of the performance or shutdown of the air pressure switch is affected by wear on 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 pressure of the gun, a decrease in the density and washing characteristics of the jet.
Descaling
If the device does not maintain the set pressure level, the pump is intermittently operated and the water supply is done in fragments, repairing the Karcher high pressure washer with its own hands will not be particularly difficult. It is enough to unscrew the bolts with a screwdriver and remove the housing, take out 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.
Valves are removed from the piston (use of sharp objects is excluded, which can damage the surface), the pump is disassembled into 2 parts. Again the valves are removed.
So the reason for the failure of the device is found out. It may be scale formation or clogging. All parts in the inside of the pump are cleaned and wiped with felt. Then the design is assembled in reverse order.
Air hose repair
Do-it-yourself Karcher high-pressure hose repair consists in crimping a damaged element at the ends or along the entire length. If the sleeve is ripped off the flange, the unsuitable part should be evenly cut to the zone where there are no deformations. The required flange is selected and placed on the hose. The first must be inserted into the second and squeezed in a vice. Hammer strikes are applied from above.
If a cut has formed along the length of the sleeve, similar work is done. The hose is cut and removed to the undamaged area. 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, repairing the Karcher high-pressure hose with your own hands is not possible. A complete replacement of the product is required - it is better to instruct the service center masters.
Cleaning the foam nozzle tablet
If the foam nozzle has ceased to give out thick foam, is used for a long time or is not washed with clean water after use, the net in the form of a shaft is clogged with dried "chemistry".
To clean the foam tablet, you need to perform a number of operations:
- Disconnect the tank from the main device of the foam nozzle.
- The arrow indicates the location of the pin holding the plastic tablet tip on the brass element. The pin should be knocked out. If you decide to repair the foam nozzle "Karcher" 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 spray angle of the foam. The tip with them must be unscrewed.
- In the inner part of the removed nozzle, steel threads that take a rounded shape (in the form of a tablet) will be visible. They should be removed with an awl. The hardened “chemistry” in the nozzle is cleaned with a needle.
- Assembly of the product is carried out in the reverse order.
Correctly made repair of the Karcher nozzle with your own hands allows you to extend the life of the device and reduce the cost of its maintenance.
Motor breakdown
Repair work| Breakage | Possible reason | Ways to solve the problem |
| Motor does not work | Low voltage | The mains voltage is checked and the plug is connected correctly. |
| Extension cord damage | Connecting the device without an extension cord |
| Motor protection relay activated | The drug is turned off for 15 minutes |
| The motor is noisy, but there is no return | Voltage reduction when using an extension cord | The extension cord is disconnected |
| Low voltage | Do not rush to do the repair of washing machines "Karcher" with your own hands. Initially, it is required to check the compliance of the power with the recommended indicator |
| Motor stops | Incorrect mains voltage | The power in the network is determined and compared with the data on the tag |
| Motor protection relay activated | The machine needs to cool for 15 minutes |
What else affects engine performance?
The lack of a routine inspection of the main elements of the device can cause a number of additional problems associated with engine failure.
Motor repair| Breakage | Possible reason | Ways to solve the problem |
| Lack of pressure | Pistol nozzle clogged | Nozzle cleaning required |
| Water supply valve closed | Check the fluid supply, if necessary, carry out a quality repair of the Karcher hose with your own hands. |
| Filter clogged | The filter is cleaned and replaced. |
| Arbitrary inclusion of the motor | Lack of tightness of the pump, gun | Parts are replaced (see example above). |
If there are difficulties in identifying a breakdown, it will be right to contact professionals. Many users mistakenly establish the cause of the breakdown and repair the Karcher pump with their own hands during choppy work. The real reason can lie in a weak pressure of water or low voltage.
Bearing replacement
The need to replace the bearing can be caused by intermittent operation, the formation of 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, it is required 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 several steps:
- The hose with the gun is unscrewed, the body is disassembled and the engine with the cylinder head is taken out.
- 6 self-tapping screws are unscrewed and the block with the switch opens, 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, you can conduct a thorough review of the cage with balls.
- The middle bolt is unscrewed with a screwdriver under the sprocket. To do this, the shaft is clamped on the back with a gas key.
- The internal bearing, which acts as a support for the inclined washer that presses the valves, is changing.
Change of oil
The whole process of changing the oil is carried out in several stages:
- A container is prepared to accommodate 1 liter of oil.
- The output tray is harvested.
- The drain plug is screwed out.
- The receiving tray drains the oil into a collection tank.
- The drain plug is tightened.
- Slowly fill up to the MAX mark. Air bubbles will evaporate on their own.
The type of oil and the volume of filling can be found in the technical characteristics of the device. The spent liquid is disposed of ecologically or collected at 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.