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Pressure Washer Pump Oil Leaking: Causes, Fixes, and Maintenance Guide

A Pressure washer is a basic household need and an outdoor tool whose efficacy you can never deny. However, one fine day, when you take it out to clean your outdoors and find the pressure washer pump oil leaking, will surely frustrate you. Not only that your task gets postponed, you will be more anxious to find out that the oil leak has caused your garage floor to grease.

However, you need not worry because we’ve got good news for you. The pressure washer pump leakage is a minor issue that can be conveniently solved with a little effort on your own. This post will cover common reasons behind leaking pressure washer pump oil and their quick fixes along with essential tips to prevent your pressure washer pump from leaking oil.

Why is my pressure washer pump leaking oil?

If your pressure washer pump oil is leaking, there are a few major factors contributing, of which we have listed four major ones.

1.      Broken or Damaged Seal

The most common and major reason for leaking pressure washer pump oil is a broken or damaged seal. The seal keeps the pump oil from leaking through the pump’s housing and once worn down, a leak can occur. Filling the pump with less pump oil will cause it to dry out fast which can result in friction between the seal and eventually damage it.

If you find your pressure washer pump oil milk, this is reflecting that the internal seal may have broken. Mostly the seals get broken or damaged due to inadequate maintenance and regular wear and tear.

2.      Loose Bolts or fittings.

Pressure washer pumps can leak oil due to vibrations that occur when operating. This cause the fittings and bolts to loosen and make gaps that lead to oil leakage. It is always recommended to tightly secure any fittings like machine filters after maintenance work.

3.      Too Hot or Cold temperature

Extreme temperatures like too hot or too cold can cause the openings of the pump to expand or contract. In such a case, the resulting gap can cause damage to rubber components and eventually cause the pressure washer pump to leak oil.

4.      Overflowing oil

Putting more than the pressure washer pump oil capacity is a major inefficacy on the part of the operator and should be taken care of. This can cause the excess oil to overflow from the pressure washer pump.

How to Fix Pressure washer pump leaking oil

Now you might be anxious that are so many possible causes for your pressure washer pump oil leaking and wondering how to deal with each. So, in order to find out how to handle these, we have discussed in detail 5 quick fixes for your leaking power washer pump oil.

1.      Get a pressure washer pump oil seal replacement

Before you start your work with the damaged seal replacement, ensure that you have bought the right oil seal replacement kit which is compatible with the pressure washer pump type that you possess. Not only it is important to replace the oil seal kit but also it is equally important to replace the water seal kit. A pressure washer possesses a number of seals at different locations and can be worn out due to many reasons like extreme temperatures, poor maintenance, or loose fittings.

2.      Regular maintenance of Seals

Pressure washer pump seals may require regular maintenance to avoid damage or oil leakages. Therefore, in order to keep the seals intact, we recommend that you check them from time to time (at least thrice a year) and replace any damaged seal if needed.

3.      Use the most compatible seal kit

To avoid recurrent damage to seals, it is recommended that you get the right and compatible seal kit for your pressure washer pump. Also, it is essential to read the buyer’s guide to effectively install the new replacement kit to avoid any further damage.

4.      Avoid exposure to Extreme temperatures

Extreme temperatures can severely damage pressure washer pump seals as these components are mainly made of rubber that can damage due to extreme cold or extremely hot weather conditions. Extreme temperatures cause the seals to expand or contract eventually leading to leakages.

5.      Use non-detergent lubricant oil for Pressure Washer pump

A lubricant oil is necessary to prevent the pump seals from friction that can damage them. For this purpose, a non-detergent lubricant oil is considered to be the best pressure washer pump oil as a detergent oil draws dirt from the pump walls and builds up dirt walls inside the pump.

Frequently asked questions – FAQs

1.      How to change oil in pressure washer pump?

Here is a step-by-step process to change oil in pressure washer pump

  1. Switch off and let the washer cool.
  2. Clean the fill area after draining the old oil.
  3. Refill with the recommended amount of oil.
  4. Run for a little period to stir the fresh oil.
  5. Examine the oil level and properly dispose of used oil.

2.      Can I use motor oil in my pressure washer pump?

No, Motor oil is not suitable for pressure washer pumps due to their need for specific oil for high pressures and temperatures. Regular motor oil may not provide adequate lubrication and protection, potentially causing damage or premature wear.

3.      What is cat pump oil?

Cat pump oil is a specialized oil for high-pressure pumps manufactured by Cat Pumps, used in various applications like pressure washers, car wash systems, and water treatment. It provides proper lubrication, reduces wear, and ensures optimal performance and longevity. It is crucial to use the recommended oil to maintain efficiency and prevent damage to components.

4.      What are the few best oil for pressure washer pump?

The few best pump oil for pressure washer includes:

  1. Simpson pressure washer oil
  2. Craftsman pressure washer oil
  3. Amsoil pressure washer pump oil
  4. 15w40 pressure washer pump oil
  5. cat pump oil
  6. Gp series 100 oil

5.      How to check the oil level in a pressure washer?

To check a pressure washer’s oil level:

  • The pressure washer should be turned off and given time to cool.
  • Find the pump’s oil fill cap or dipstick.
  • Take off the cap or dipstick and clean it.
  • Replace the cap or dipstick without tightening it.
  • The oil level should be between the high and low levels on the dipstick, or it may be marked on the cap if you take it out again.
  • If the level is low, add oil, but don’t overdo it.

6.      How frequently should you change the pressure washer pump oil?

Normally, the pressure washer pump oil change should be done after 50 hours of use or once per year, whichever comes first.

Read also How to repair pressure washer hose – 4 simple steps

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