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. 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 – 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. 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.

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.

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

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. 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. 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. 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.

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. 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.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. 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 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.