My Troy Bilt power washer (using Honda GCV160 engine) has no pressure coming from the pump. I checked the water flow, everything seems fine. I believe the pump needs oil added, however, I can't seem to firgure it out (how to add oil to the pump). I did notice that previously, I used to see drops of oil coming from under the pump. I I have a bad seal, can I add oil and test the pressure before I change the seal? Please advise.

Check oil level may be low

Could also be crack/leak in HP pump. If it were left in cold weather without antifreeze, I'd check there first. Part + labor might warrant new washer if more than a couple years old.
Sorry.

Cover soap inlet and retry. Mine will not pressurize without soap or without inlet covered.

I have two pressure washers and honda engines on both. Carb needs to be cleaned I would bet,had to on both of mine. Good luck.

same problem here

Call us when you can be at the washer so we can trouble shoot it with you over the phone.
http://www.ppe-pressure-washer-parts.com/troy-bilt-020416-1-pressure-washer-parts

Looks like the pump has failed; most times caused by freeze damage. If you store over the winter, you need anti-freeze in pump.

Sounds like your pressure pump is shot. Replace it.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/anthony_e4f197748c31eabd

sounds like there is a valve hanging up inside the pump

It sounds like an air lock. Try this: With the machine off, connect the hose to the washer and let it run for several minutes to get all of the air out of the hose, and to purge any air out of the pump. Shut off the water, and connect the high pressure hose, but not the gun. Let the water run for several minutes. stretch out the HP hose and make sure that the air is displaced. Shut off the water, connect the gun, and purge as before. Now crank it washer up. As quickly as safe to do so, open the trigger to keep water moving through the washer. It should come up on pressure very quickly. It is better during normal operation to keep water moving through the system. When I am through for a while, I shut down my washer, but leave the trigger depressed to allow the pump to stay full of water, and cool. This prevents further problems when I restart it.
Hope this was useful.

Regards --W/D--