I have a troy build pressure washer model number 020337 Do I need to change the oil in the pump, and if yes how do I drain it and what kind of oil. I know how to change the engine oil

https://www.youtube.com/watch?v=_eJ8ifO24ec

Check oil level may be low

underneath base of motor look for a plug wuth a square slot,i normally use a 3/8" extension with ratchet.

i find it easier to run it out of gas and tip it on its side and drain it from the dip stick tube uses sae 30 or 10w-30

There should be a little wondow on the side of the pump body to show you the oil level and a oil filler cap on the top of the pump body . There should also be a drain on the bottom of the water pump this is not the engine its the water pump . It will take 10 -30 or 30 wieght oil check your manual or local dealer for your specific pump oil requirements . But if you use it often change it don't add and do the engine oil tothis is the biggest killer of pumps and engines and pumps nelgeliting oil changes also eighter drain all water from the pump or winterize in freezeing temputers

pull outs

A leaking gun will kill all the pressure. You may need to repair or replace the gun

check the non-return valves in the pump block. if these are damaged or dirty you pressure will be greatly reduced. they are located behind the 3 lage brass hexagonal caps.

I hope this helps

From the manual CleanShot 2050 Briggs and Stratton

Change Pump Oil
1. Drain engine oil and fuel from pressure washer
2. Use an 8 mm allen wrench to remove black pump oil cap between high pressure outlet and garden hose inlet.
3. Tiltl pressure washer to drain oil into an approved container until it drips slowly from pump.
4.Tilt pressure washer in opposite direction and empty premeasured pump oil bottle into same opening (a small funnel may be helpful) [THIS IS WHAT THE MANUAL SAYS-NOT CLEARLY WRITTEN IN MY OPINION OR WRITTEN BY SOMEONE FOR WHOM ENGLISH IS A SECOND LANGUAGE]
5. Install black pump oil cap and tighten firmly.
6. Set pressure washer in upright position. Add fuel and engine oil.

From the engine manual use synthetic 5w-30, 10w-30 from -20 degrees F to temperature of 100 degrees F.
Change oil after 5 hours of operation initially. Before tipping to drain oil, remove fuel from fuel tank by running until tank is empty. Remove oil cap and dipstick and tip engine. Keep spark plug side up. Or remove drain plug from the bottom of pressure washer with a ratchet and square extension and drain oil from bottom. (fuel does not have to be removed)

What fluid and how much is required in the Troy-Bilt 2550 power washer pump?