HOW TO REPLACE THE CHECK VALVES ON YOUR PRESSURE WASHER PUMP FOR ANNOVI REVERBERI PRESSURE WASHER PUMP BRAND
When a pressure washer pump fails, it tends to be the small parts that go bad. Even though the check valve is small, they serve a much larger function within the pressure washer. Replacing check valves is a lot like replacing a pump head since both pertain to the same section of a pump. Because you’ll likely be making this repair with the pump still attached to the pressure washer, ensure that if you’re planning to lay your pressure washer down, the engine is positioned in a way that oil will not leak into your pistons or carburetor.
STEP 1: COLLECT THE NEEDED TOOLS
- Correct Allen Wrench
- Needle Nose Pliers
- Tweezers (optional)
- Flathead Screwdriver
- Rachet and Correct Size Socket for Discharge Side Valve Plugs
- CLR (Calcium, Lime & Rust remover)
- Disposable Toothbrush (Don’t use your spouse's brush)
STEP 2: REMOVE PUMP HEAD AND CHECK VALVES
STEP 2.1 - Use the 6mm Allen wrench to loosen the bolts on top of the pump. It may take a bit of rugged strength since they’re set using Loctite.
STEP 2.2 - Lightly rock the head back and forth to remove the head from the body.
STEP 2.3 - The head will have 3 open areas that the pistons fit into. If any of the bushings are stuck, remove them and set them aside for reinstallation. Carefully remove the water seals that are holding the check valves in and set these aside.
STEP 2.4 - Carefully remove the check valve parts (seal, housing, valve, and springs may pull free as one piece or in parts). Avoid marring the sidewalls of the head. If the seal is hard to remove, sometimes you can use one of the bolts that are used to fasten the head to the pump to wedge into the middle of the seal and remove it if they are small enough.
STEP 3: REMOVE DISCHARGE SIDE CHECK VALVES
STEP 3.1 - For the discharge side, use a rachet and the correct size socket to remove the valve plugs. Be careful of the o-ring as you remove the plugs.
STEP 3.2 - Look over the plugs to see if the o-rings will need to be replaced before tightening. It’s best to make the repair now while the unit is apart.
STEP 3.3 - As before, carefully remove the check valve parts (seal, housing, valve, and springs may pull free as one piece or in parts). Avoid marring the sidewalls of the head. Again, you might be able to use one of the bolts that are used to fasten the head to the pump to wedge into the middle of the seal and remove it.
STEP 4: CLEAN PUMP HEAD
STEP 4.1 - Next, gently clean the pump head using a toothbrush and a mix of CLR and water to remove any calcium buildup.
STEP 4.2 - Rinse the head with water thoroughly before beginning reassembly, and allow it to dry.
STEP 5: INSTALL NEW CHECK VALVES
STEP 5.1 - Installation of the new check valves is exactly the opposite of how you took them out. This means you’ll start with the valves on the discharge side by gently placing them into their openings. Make sure the seal side of the check valve goes in first.
STEP 5.2 - Using the Allen wrench head or another small, flat surface, gently press the valves down until they seat into position. Do this for all three of the valves on the discharge side.
STEP 5.3 - Replace the plugs and tighten them down with your rachet and then use a torque wrench to 219"-lbs.
STEP 5.4 - For the check valves on the bottom side of the head, place them (also seal first) into their respective openings. Using a flat-faced tool, apply gentle pressure to seat them into place.
STEP 5.5 - Replace the black seals that cover the check valves. It’s recommended that you use new seals instead of reusing the old ones.
STEP 5.6 - Set them in place with the grooved side of the seal facing down into the head. When properly in place, the seal will sit flush with the inset rim of the manifold.
STEP 6: RECONNECT HEAD TO PUMP
STEP 6.1 - Install the bushings into the head with the grooves facing away from the head. Installing these incorrectly can result in damage to the seals.
STEP 6.2 - Slide the new head down onto the pistons until the head is flush with the body.
STEP 6.3 - Apply Loctite to the bolts to prevent them from coming loose from vibration. You can use red or blue, depending on if you think you’ll ever need to remove them again in the future.
STEP 6.4 - Hand-tighten the bolts first. Then use the Allen wrench to finish tightening them down to 221"-lbs or 18.4'-lbs of torque. Be careful to not over-tighten them. Doing so could break the heads off of the bolts or strip the aluminum threads inside the pump wall.
With your check valve replacement now complete, it’s time to test it out. Make sure you only test the unit with water running through the system.
Replacement Check Valves SKU - 101351, 100234, 100248
Replacement Check Valves with O-Rings SKU - 100223, 100243
Replacement Water Seals SKU - 100247
Replacement Bushings SKU - 100241
Replacement O-Rings SKUs - 100231, 100238, 100254
Associated Models - AR2233, AR42123, AR1828, AR2864, AR2840561, AR42122, AR2190, AR2237, AR2701
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