Spill Valve 4.591-040.0

Hello Jose, Thank you for your inquiry. Before beginning this repair you will want to be sure you have a set of Torx bits and Allen wrenches or ratchets as many pressure washers incorporate these types of bolts and screws. Start by removing the pump as you can access the spill valve without removing the pump from the pressure washer, but you may find it more difficult to leave the pump on because the pressure washer frame doesn't leave a lot of room for the repair. You will find it easier to remove the pump from the pressure washer before beginning the spill valve repair. 1. Remove the four bolts that hold the pump to the pressure washer. 2. Use your box or wire cutters to cut the detergent line where it attaches to the pump. 3. Now you can remove the pump from the pressure washer engine. Just slide it out and away from the engine. Now that you've removed the pump, you can remove the spill valve without the pressure washer frame getting in your way. 1. Use a flat-head screwdriver to pry up the button cap. Then remove the black thermal valve cap. 2. Remove the two screws that hold the thermal release valve to the pump. These screws may require Torx 30 bits, depending on the pressure washer. Karcher pressure washers use Torx bits to fasten the thermal release valve. Slowly remove the thermal release valve--a spring is hiding beneath it. Remove the thermal release valve spring. 3. Now you can remove the spill valve. You will need a good set of needle-nose pliers to grip the tab on the valve. Hold the pump assembly firmly, and pull the spill valve out of the pump. It is normal for this to take a good bit of force. 4. Lubricate the new spill valve. Before installing your new valve, you need to lubricate the top o-ring (the o-ring is green on Karcher spill valves). Do not lubricate the bottom o-ring--it holds the valve in place. 5. Use your pliers to grasp the tab on the new valve and place it back into the pump. 6. Replace the thermal release valve spring. Now fasten the release valve back into place with the Torx screws. 7. Fasten the button cap by setting the thermal release valve cap into place and use a screwdriver to pound the button cap back onto the assembly. Now that your new spill valve is installed, you can reattach the pump to the pressure washer engine. 1. Cut off the old detergent hose. Cut off the leftover piece of detergent line on the pump nipple. 2. Slide the pump into place on the engine and begin tightening the bolts. Once the bolts become snug, tighten each one a little bit at a time so the pump creates a solid seal with the engine. 3. Fasten the detergent hose. Now all you have to do is slide the detergent line onto the pump nipple. Hope this helps!