A pump oil change should be done every 3 to 5 months to keep equipment running smoothly, safely and efficiently. The high pressure pump inside a hard working pressure washer is literally the heart of the machine. The purpose of the pump is to produce the water pressure which enables you to do the task at hand.
There are many benefits to regularly changing the oil and the most obvious is clean oil keeps a machine lubricated and running properly. When clean oil flows through a pressure washer pump, you will extend its working life (new pressure washers don’t come cheap) and optimize its performance. You’ll get the most out of your hard working machines when you take care of them.
Most pressure washer pumps use a 30w non-detergent oil. This is because most pressure washer pumps use splash lubrication. This is a process that includes rotating “dippers” that throw oil into the pistons and cylinders.1 It is important to use a non-detergent oil in this setting because using an oil with a cleaner (detergent) will foam up when it is agitated by the dippers. Check your pressure washer manual to make sure you are using the right oil.
There are several methods for removing oil during a pump oil change and these are explained in more detail below. The basic procedure is the same regardless of how the oil is extracted;
- Run the machine for a few minutes or perform the pump oil change at the end of using the pump. The reason is warm oil traps the dirt better and flows much quicker than cold oil. A word of caution: the unit may be hot to the touch so use caution when removing the drain plug.
- Extract the oil from the pump using one of three methods:
Drain it from the bottom of the oil pan using the oil drain plug
- Suction it out, using a suction gun
- Pump it out, using a hand-operated or electrical suction pump
- Put the used oil in a container so that it can be brought to a recycling facility to be cleaned and reused. Used motor oil never wears out, so why throw it out?2
- Secure the drain plug. Now it is safe to fill the pump using the oil fill opening. Secure the oil fill cap and you're done!