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Replace? It should be at the bottom of the reservoir
Underneath the washer holding tank is the pump motor.
Honda K2400HH pressure washer pump how much oil do you need to put back in
A Karcher pressure washer pump requires 15W40 non-detergent oil. It takes 4 ounces and doesn't need to be changed because the oil will last the for the lifetime of the pump.
Nothing!
Nothing!
How much pump oil goes into a Troy Bilt Pressure washer Model 020242
5 oz
Yes, but not very well. The small pump within a pressure washer is designed to PUSH water, not pull it- and the rate of flow is very small. It would pump a long time to move a major amount of water. The pump will also not handle dirty water very well.
You will need to replace the fuel pump and filter, The fuel pump is what makes the pressure.
If it has no pressure your problem should be on the pump. The three things I'd recommend you to check are: Packings, Unloader and Valve Kit.