Slide and pull out the inlet cover with the inlet seals to find the red inlet valve in the slot. You can remove this inlet valve with the help of tweezers – and place a new valve there before reassembling the cover and the machine. A leaking pump indicates that internal piston seals will have to be changed. For that, you need to take the pump assembly out and inspect the pistons and the O-rings. You’ll need to pull the pump up slightly, which will allow you to pull out the outlet connector for its replacement – or change the O ring. The labelling on the lance (3 - Hard, 2 - Medium, 1 - Soft and Mix - for detergent application) relate to use with a Karcher G145 Q Power Control Gun as the gun will display the pressure setting in relation to the labelling.

To replace your pump, simply remove the pump from the engine by removing the fasteners – and you may also have to remove a clamp that holds the pump in place in some models. Then, cut off the detergent hose from the old pump. You may notice the engine oil looking milky. This is likely because water has been leaking into the oil from the oil seal. I asked a question on here about 3 or 4 months ago, as having not used my pressure washer for some months it had started leaking. It made a rattling noise when I moved it. It was suggested the fault might be the O Rings. I have a Karcher extension hose between the front of the unit and the pressure gun. That has seized onto the pressure washer, and however hard i try i cannot shift it. As a result I hadn't got round to stripping the washer. The problem of water leaking from the spray gun can be easily fixed by ensuring that the connection between the hose and the gun is tight and secure. For that, press or screw the gun firmly to the hose. To fix the water leakage problem in your Karcher pressure washer, you must identify what might trigger the issue. You won’t have much trouble handling the replacement process on your own, especially with all the videos and guidelines available online.

Karcher VP145 Variable Pressure Vario Lance - K4 K5 | 2.642-725.0

If there’s water in your washer’s engine oil, the faulty oil seal will need to be changed. For that, you must disassemble the pump assembly to detach the pump from the piston housing.

If your pressure washer has an undamaged pump and inlet/outlet seals, the piston seals might be damaged. Karcher pressure washers have a positive displacement pump with pistons to pressure and draw the incoming water supply and force it out through the cleaning nozzle. Here’s a YouTube video that describes the process. This should help fix the problem if you find any Karcher pressure washer leaking at hose connection. 2. Leakage from Outlet Hose or Trigger Wand Connection While getting your washer’s pump repaired by an expert may sometimes fix the problem, you’ll need to replace the pump if it is old, seriously worn out, and damaged. If that’s not the case, disassembling and reassembling the pump may sometimes fix the problem.

The process of dismantling and reassembling the pump has been clearly explained in this video. If you know your way around appliances and tools, you may not need an electrician to do this. 4. Leakage from Piston Seals in Undamaged Pump Here’s a video that shows how to replace the O ring in any model of the K series. So if, for instance, you find your Karcher K4 leaking from outlet connections, here’s what you’ll need to do. Leakage can also take place because the press fit/screws are not working correctly. Or, the O-ring of the hose might be broken or damaged. How to Fix – If the couple is damaged, it will need to be replaced the same way as the inlet cover – and if the coupling is intact, the O ring inside needs replacing. O rings are easily available, and the replacement process is pretty straightforward.

If you find your Karcher pressure washer leaking, it’s usually because some part of the device is worn out or loose. You may choose to repair the part, but in most cases, changing it is a better option to breathe new life into your pressure washer. FAQ a) Why is your Karcher pressure washer leaking oil? If your Karcher pressure washer leaks water from the bottom, it might be because of damage in the thermal release valve due to overheating. This valve maintains water temperature by recirculating water and releasing excessively hot water. Then, disassemble the pump further to separate the valves, upper oil seals, injector cage, spring, and injector valve. If you find your Karcher K4 leaking from bottom or connection parts, here’s a video to show you how to pull out the pump before disassembling it. Oil seals are present on the piston slot holding the pump of your pressure washer. Water leakage into oil results from damage in one or more of the oil seals or rings. How to Fix – Remove the machine’s casing and locate the outlet connector. It remains connected to the pump with a metal fork and an O ring.The pump and switch assembly are clamped to the motor assembly with screws that need to be undone. You will then have to remove the inlet and outlet, held in place with metal forks. As a result, the pump’s ability to hold or pressurise water is compromised. If your pump looks fine and the pressure washer is fairly new and seldom used, it might be a pump assembly issue causing water or oil leakage. How to Fix – The outlet seal is at the connection between the pump and the high-pressure washer hose that pushes water to the trigger wand. This point of attachment is similar to that of the inlet connection in structure, complete with couplings and outlet seals. If you notice water leaking at the inlet connection, there’s a fault with the coupling or the seal. After prolonged use of the pressure washer, the coupling and the inlet seal start to wear out and even break. How to Fix – The process of dismantling and reassembling the pump is slightly more complex. After removing the outer casing and the clamp described above, you must pull out the pump and detach the detergent hose.

The Karcher VP145 Variable Pressure Vario Lance is a variable pressure spray lance that is suitable for use with Karcher K4 to K5 pressure washers (except the K 5 Premium Smart Control or the K5 Full Control Plus Models). The Karcher VP145 Variable Pressure Vario Lance is a pressure adjustable spray lance for Karcher Home Pressure Washers that allows you to choose the right setting for your surface by twisting the spray lance. From a low-pressure detergent jet, to a high-pressure fan jet. This makes it suitable for cleaning all around the home, such as fencing, garden furniture and vehicles. In that case, the coupling and the seal will have to be replaced. The process of replacing the connector is extremely easy. But here’s a word of warning! If you’re not experienced in handling hardware or don’t feel confident, don’t wing it. If your Karcher device is still within its warranty period, it’s better to take advantage of the company’s customer support system. Karcher pressure washers can help clean up anything – from patio furniture to cars in the garage – in a jiffy. They are also super durable, though you could find a water leak problem because of its cylinder head or other complex parts. But don’t worry about replacing a new machine if you find your Karcher pressure washer leaking.The seal in the piston prevents leakage of water and helps maintain the pressure on the water – but will fail when it wears out or breaks over time. You may also find water leaking due to broken O-rings in pistons. How to Fix – When the pressure washer runs and allows the water in without spraying water, the water heats up. But if the water becomes extremely hot, the thermal release valve can get damaged, causing leakage and pressure loss. How to Fix – Also, detach the chemical injection tube, the metal clamping plate, and the switch assembly to free the pump from the loosened piston assembly. You can pull apart the manifold and the lower part of the pump.