How to Fix a Cracked Pressure Washer Pump – Step by Step Guide

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It is usually normal for a pressure washer pump to crack. However, in circumstances where the pressure washer pump cracks, it is always advisable to fix it before replacing it with a new one. Fixing a cracked washer pump is not as tough as you could imagine. When a washer pump cracks, you should fix it as soon as possible.

In this article, you are going to find steps on fixing your cracked pressure water pump. It also contains ways of troubleshooting cracked pumps. If you are interested in knowing the causes of the cracked pressure water pump and how to repair the washer pump, the steps are well explained below. Follow the steps below keenly.

Table of Contents

Causes of a cracked pressure washer pump

  1. If the water within the pressure washer pump freezes, it may break open. This is because water expands as it freezes, and as it grows, it puts the pump at risk.
  2. Frozen water puts the seal on the pressure washer pump’s capacity to pressurize the water in difficulty. The pump could only retain a certain amount of water, and if it can’t, it will burst.
  3. When a cracked pressure washer pump is discovered, it should be addressed immediately to prevent additional damage or injury to the user.

Repairing a Pressure Washer Pump that has cracked

Repairing Cracked Pressure Washer Pump

The most essential element of the unit is the pressure washer pump, which is a component of the whole unit that operates moving water through the washer. If you know what to look for, dealing with a broken pressure washer pump is simple.

Step 1:

Examine the entire pressure washer system. Make certain we’re dealing with a fractured washer pump.

Step 2:

A JB weld and brazing may be suggested by certain self-help and DIY websites. These are not, however, 100 percent trustworthy. Welds can only withstand enough pressure to bring you to a good repair in a reasonable amount of time.

Continuous use of a broken pressure washer pump may lead it to disintegrate. Ensure you don’t take the chance of waiting for it to happen.

Step 3:

Take action immediately. Welding or brazing won’t fully solve the problem. However, there are a few more procedures to do before the full repair.

Follow the methods below to weld or braze:

  1. Using an angle grinder, grind any projecting metal flush. Make it as smooth as possible and flush with metal around it.
  2. Activate a brazing burner. Please turn on the gas, then adjust the flame until it’s a beautiful, blue-hot flame.
  3. Build up the area with a brass brazing rod and leave it for the day. Allow the rod’s substance to flow or pool in the region that has to be mended.
  4. Finish the repair once you’ve given it enough time. This is just a cosmetic fix at this stage. It’s only for the sake of aesthetics. To make it appear nice, use a blended wheel to finish the job.

Step 4:

Keep in mind that any pressure above 2000 psi is dangerous. As a result, welding isn’t always a good idea. Even gunsmiths or metal workers advise against it.

At this point, we’ll attempt to figure out the next stage so we can contact the manufacturer – assuming it’s still under warranty. Otherwise, it’s only a matter of figuring out which pump to substitute it with.

Step 5:

Examine the pressure washer pump’s underbelly. It should include the pump’s component number and model number. You may find alternatives for the complete pump component by doing a simple search on Amazon.

Make sure you know which components of the assembly need to be replaced. You may not need to waste money on components that aren’t intended to be replaced just yet.

Step 6:

When dealing with electrical appliances, be sure to observe all safety measures. If necessary, use gloves and eye protection.

Your pressure washer pump should be held in place by three bolts on the bottom of the pressure washer. Remove the old component and substitute it with a new one after the bolts have been removed. Make sure it’s in the same spot as the previous one.

New washer pump rings are typically included with replacements, and it’s a good idea to utilize them in conjunction with the new component. The rings should feature an X on one face, indicating that the side moves up. After you’ve installed the new washer pump, tighten the nuts. Overtightening the bolt may induce cracking around the intake as well.

Some experts also recommend removing the pump if it will not be utilized for an extended period. It is also the simplest method for draining water.

Various problems with pressure washer pumps

Problems With Pressure Washer Pump

1. Leaks

Pressure leaks are the most frequent issue with the pressure washer pump. Components that are worn out, defective, or broken are more prone to produce leaks. The most susceptible sections are:

  1. O-rings
  2. Case
  3. Identifying the leaks

2. Pulses

If the problem is caused by a defective or malfunctioning cylinder head, the force will pulse to trigger the force that causes the machine to shut down when not in use. This causes the motor to restart or pulsate.

Another factor that may cause your surface cleaner engine to pulse is a lack of water. If the water intake filter is clogged, only a little water will reach the pressure pump. The issue is simple to solve.  All you have to do is to remove the filter and cleanse it of any obstructions. Do this if your machine’s unit is pulsating, but not if it’s leaking.

3. A worn-out pump

Although a worn-out pump is uncommon, it may occur if you run your device without changing the oil, causing premature wear. It may be due to the fact that you used the incorrect lubricant or oil. Water might have gotten into the pump, or the machine could have been operated without any water. You must hire a skilled technician or replace your pressure pump if it is worn out.

4. Presence of air in your System

The pump will produce shaking and vibrations once there is air inside the System. Pressure drop or even intermittent pressure is also possible. The issue is with the water pickup on the machine and the pump.

Once the pressure system is turned on, it suctions water with air and produces a vacuum, which causes the water to pulsate. Check the hose or fittings for damage or leaks, and replace them if necessary.


To avoid unintended consequences, proper use, appropriate storage procedures, and preventative actions should be followed. According to several repairmen, almost all pressure washer pumps sent to their repair shop have blocked valves that need to be cleaned. As a result, some of the pressure washer pumps have broken. The pressure washers with broken pumps have been those that had not been winterized or had been left unattended for an extended period. Leakage and fractured pistons are common symptoms in all of them.

The most frequent reason is water trapped within the head region and froze due to a lack of preventative maintenance. Put it aside for the winter and put an RV anti-freeze in it to prevent this. Ensure that all of the water has been drained. If you follow all the above steps and do not work for you, you need to find an immediate alternative. It is best if you contact a professional.

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