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 – 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? 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 – 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

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. 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 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. 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.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. 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.

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 – 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.But if the machine is out of warranty and you want to fix it yourself, below are the problems that might develop – and the ways to handle them – 1. Leakage from Inlet Hose Connection 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. In that case, the coupling and the seal will have to be replaced. The process of replacing the connector is extremely easy. 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.