Subaru EA175V Pressure Washer Pump: Troubleshooting & Repair Guide

Oct 22, 2025 by Jhon Lennon 67 views

Hey guys, if you're here, chances are you're wrestling with a Subaru EA175V pressure washer pump. These pumps are pretty common in various pressure washers, and when they go south, it can be a real headache. But don't sweat it! This guide is designed to help you troubleshoot and, hopefully, repair your pump. We'll break down common issues, what causes them, and how to fix them. Let's get started!

Understanding the Subaru EA175V Pump

First things first, let's get a handle on the beast we're dealing with. The Subaru EA175V is typically a single-cylinder, air-cooled, four-stroke engine. This engine is often coupled with a pump to deliver high-pressure water for cleaning. The pump itself is usually a triplex plunger pump, known for its efficiency and durability. Understanding the basic components – the engine, the pump head, the plungers, the valves, and the various seals – is crucial for diagnosing any issues. The pump works by drawing water in through an inlet valve, compressing it using plungers, and then forcing it out through an outlet valve at high pressure. Any problems with these components can lead to a drop in pressure, leaks, or even complete pump failure. Remember, regular maintenance is key to extending the life of your Subaru EA175V pressure washer pump. Keep an eye on oil levels, check for leaks, and don't let it run dry. Always refer to your pressure washer's manual for specific instructions and safety precautions.

Before you dive into the repairs, safety first! Always disconnect the spark plug wire and ensure the engine is cool before starting any work. Wear appropriate safety glasses and gloves, and work in a well-ventilated area. Now, let's explore some common issues and how to tackle them. If you are not comfortable working with engines and pumps, consider taking your machine to a qualified mechanic. Also, make sure that the pump is rated for the job. Using the wrong pump can lead to all sorts of issues.

Common Problems and Troubleshooting Steps

Let's face it: Subaru EA175V pressure washer pumps aren't immune to problems. Here are some of the most common issues you might face and how to troubleshoot them:

Low Pressure

Low pressure is probably the most common complaint. It can be caused by several things, so you'll need to do some detective work. First, check your water supply. Make sure you have adequate water flow to the pump. A clogged inlet filter can starve the pump of water and reduce pressure. Also, inspect the pump head for any leaks. Leaks can bleed off pressure, reducing the cleaning power. Next, take a peek at the unloader valve. This valve regulates the pump pressure, and if it's faulty, you could experience low pressure. Remove the valve and check for debris or wear. If you find any, clean or replace it. Finally, look at the valves. Debris, wear, or damage to the inlet or outlet valves can also cause low pressure. You can remove and inspect the valves, and replace them if necessary. Another culprit can be the pump seals, which will also need to be replaced if damaged.

If the pump is still not reaching the expected pressure, there might be a problem with the plungers. The plungers, which move back and forth to compress the water, can wear out over time. If they are worn, they won't be able to generate the necessary pressure. Replacing the plungers will likely restore the pump to its full pressure capacity. Remember to always consult your owner's manual before attempting any repairs. Safety first, and be sure to wear appropriate safety gear.

Water Leaks

Water leaks are not only annoying but can also indicate a serious problem. Leaks can occur at various points on the pump, including the pump head, the seals, and the hose connections. Start by inspecting the pump head for any visible cracks or damage. If you find any, you may need to replace the entire pump head. Leaks around the seals are also common. Over time, the seals can dry out, crack, or wear down. Replace any seals that are leaking. Check the hose connections to make sure they're secure and not leaking. If the hose connections are damaged, replace them with new ones.

If you notice water leaking from the pump head or around the plungers, the seals are likely the culprit. You'll need to disassemble the pump head and replace the seals. This can be a bit tricky, so take your time and follow the instructions carefully. Replacing the seals often requires special tools, so make sure you have everything you need before starting. Regularly inspect your pressure washer and replace any worn components. Keeping the pump in good condition can save you a lot of time and money in the long run. By the way, always use the right type of oil and maintain the correct oil level. Neglecting this crucial task is one of the quickest ways to damage your pump, so make it a habit to check the oil level before each use.

Pump Won't Start or Runs Rough

If the pump won't start or runs roughly, the engine is likely the problem, not the pump itself. Check the spark plug, fuel supply, and air filter. A dirty air filter can restrict airflow and cause the engine to run poorly. If the spark plug is fouled or damaged, replace it. Make sure the fuel line is not clogged and the carburetor is clean. If the engine won't start at all, check the compression. A low compression can make it difficult for the engine to start. If you're not comfortable working on the engine, it's best to take it to a qualified mechanic. Ensure that the engine is getting proper fuel and is properly lubricated. Check for any obvious issues, such as a disconnected spark plug wire or a blocked fuel line.

One thing to remember is the importance of regular maintenance. This applies to both the pump and the engine. Things such as cleaning the air filter, replacing the spark plug, and changing the oil are essential. Also, make sure that you're using the correct fuel type. Use the fuel recommended in the owner's manual. Old or contaminated fuel can cause engine problems, so it's a good idea to drain and replace the fuel if it has been sitting for a long time. Keeping the engine in good working order ensures that the pump operates efficiently and extends the life of your pressure washer.

Step-by-Step Repair Guide

Alright, let's get down to the nitty-gritty and walk through some common repair scenarios. Remember, safety first! Disconnect the spark plug wire and wear your safety glasses and gloves before starting. This is the Subaru EA175V pressure washer pump repair guide, so follow it:

Replacing Pump Seals

Preparation: Disconnect the spark plug wire, drain the oil, and have your replacement seal kit ready. You'll likely need a set of O-rings and possibly some special tools. The seals are usually located within the pump head, around the plungers, and at various connection points. The seals prevent water from leaking out and maintain pressure within the pump system. If you find leaks around the pump head or plungers, these seals are usually the culprit. Make sure you get the right size seals; otherwise, the repair won't work.
Disassembly: Remove the pump head from the engine. Then, carefully disassemble the pump head, paying attention to the order of the parts. Take pictures as you go, or make a diagram. This will help you remember how everything goes back together. This step is critical; otherwise, you may not be able to reassemble the pump correctly. Take your time, and label all of the parts as you remove them, to ensure that you are able to put them back in the correct order. The use of specialized tools will vary depending on your specific pump model, so consult your owner's manual for specific instructions.
Seal Removal and Replacement: Remove the old seals using a pick or small screwdriver. Clean the areas where the seals were located. Install the new seals, making sure they are properly seated and lubricated. Proper lubrication will help the seals to function correctly and extend their life. It's also important to use the right type of lubrication for the seals. Use a lubricant that is compatible with the seal material. If you use the wrong type of lubricant, it can damage the seals, leading to leaks.
Reassembly: Reassemble the pump head, following your diagram or photos in reverse. Tighten all bolts to the correct torque specifications. Refer to your owner's manual for these specs. If you don't torque the bolts to the proper specs, it can cause leaks and other problems. Also, make sure that the pump head is properly aligned during reassembly. Misalignment can damage the pump and lead to premature failure.
Testing: Reconnect the pump to the engine, fill with oil, and test the pressure washer. Check for leaks. If everything looks good, you're done! If there are any leaks, disassemble it again and check the seals and reassemble the pump head again. Check for any damaged or worn parts and replace them, if necessary.

Cleaning or Replacing Valves

Accessing the Valves: Remove the pump head and identify the inlet and outlet valves. The inlet valves allow water into the pump, while the outlet valves allow the pressurized water to exit.
Valve Removal: Carefully remove the valves. Note their orientation for reassembly. The valves are usually held in place by threaded fittings or clips. Unscrew or remove these retainers to free the valves. Be very careful not to damage the valve seats during removal.
Cleaning the Valves: Clean the valves and their seats to remove any debris. A buildup of debris can prevent the valves from sealing properly, leading to low pressure. Use a suitable cleaner and a soft brush to remove any deposits. Inspect the valves for wear or damage. Look for cracks, chips, or excessive wear. If the valves are damaged, replace them with new ones.
Valve Replacement (if necessary): Install new valves if the old ones are damaged. Ensure the new valves are installed in the correct orientation. Make sure the new valves are compatible with your pump model.
Reassembly and Testing: Reassemble the pump head, making sure the valves are properly seated. Tighten all components to the proper torque. Test the pressure washer to check for leaks and proper operation.

Preventative Maintenance for Your Subaru EA175V

Look, nobody likes dealing with repairs. The best way to keep your Subaru EA175V pressure washer pump running smoothly is through regular maintenance. Here's what you should be doing:

Regular Oil Changes: Change the oil regularly, according to the manufacturer's recommendations. Fresh oil keeps the pump lubricated and extends its life. The oil type and frequency of changes will vary depending on your pump model, so refer to your owner's manual.
Check and Clean the Inlet Filter: A clogged inlet filter can starve the pump of water and lead to problems. Clean the filter regularly. You will be surprised at how much debris the filter collects. The inlet filter is typically located at the point where the water supply hose connects to the pump.
Inspect and Replace Seals: Inspect seals regularly and replace them if you notice any leaks. Seals deteriorate over time, and replacing them will prevent leaks and maintain pump efficiency.
Proper Storage: Winterize your pressure washer if you live in a cold climate. This typically involves draining the water from the pump and adding a pump saver solution to prevent freezing damage. Proper storage protects the pump from damage. Drain all water from the pump after each use. Water left in the pump can freeze and damage the components.
Use the Right Nozzle: Using the correct nozzle ensures the pressure washer operates as intended. Different nozzles provide different spray patterns and pressure levels. Using the wrong nozzle can affect cleaning performance and potentially damage the pump.
Avoid Running Dry: Never run the pump without water. This can cause severe damage. Always ensure a continuous water supply to the pump during operation. If you run the pump without water, you can damage the seals and other internal components.

When to Call a Pro

Sometimes, things are just beyond a DIY fix. If you've tried the troubleshooting steps and still can't get your Subaru EA175V pressure washer pump working, it might be time to call in a professional. Here are some signs that you should consider professional help:

Persistent Low Pressure: If you've addressed the common causes of low pressure and the problem persists, there might be an internal issue that requires professional diagnosis.
Major Internal Damage: If you suspect serious internal damage, such as a cracked pump head or damaged plungers, it's best to leave it to the pros. Major internal damage often requires special tools and expertise to repair. If the pump has sustained significant damage, a professional mechanic will be able to perform a thorough inspection, identify all the issues, and make the necessary repairs.
Complex Engine Problems: If the engine is the issue (won't start, runs rough, etc.), consider taking it to a mechanic. Engine repairs can be complex and require specialized knowledge. Engine problems can be difficult to diagnose without the proper tools and training. A professional mechanic will have the experience and equipment to accurately diagnose and repair engine problems.
Lack of Expertise: If you're not comfortable working on engines or pumps, don't hesitate to seek professional help. Attempting a repair you're not comfortable with can lead to further damage. If you're unsure about any step, it's better to consult a professional mechanic. Mechanics have the knowledge and experience to perform repairs safely and efficiently.

Conclusion

Alright, guys, hopefully, this guide has given you a good starting point for troubleshooting and repairing your Subaru EA175V pressure washer pump. Remember, safety first, and don't be afraid to consult a professional if you're not comfortable with a repair. With a little bit of know-how and some elbow grease, you can keep your pressure washer running strong for years to come. Good luck, and happy cleaning!