What kind of oil do I put in my Comet AXD2524G-T pump?

L'utiliser cette pompe sans huile est une erreur fatale:

[PDF]COMET PLUNGER PUMP SERVICE MANUAL INDEX

www.cometpump.com/_images/support/Pump_Repair_Manual.pdfLUBRICATION: Make sure crankcase is filled with Comet Pump oil. Running this pump without oil will cause damage and void any warranties. Change the pump ..

out the drain plug ? Sight glass window ? Under the pump where the crankcase meets the pump head?
tighten plug, replace oring on sight glass or replace low pressure seals if near the pump

You have to take off the pump head. Here is the link to the service for comet pumps.

https://www.pwmall.com/PDF/CometServiceManual.pdf

what you have is a bad seal or a crack within the pump crack more common if any water was left in it during the cold winter

I think install right angle elbow then short tube upwards,install the breather to this.

The oil drain should be under the pump body and requires an alan key to unthread.

You should use what the pump manufacturer recommends. Typically a 30wt non-detergent (non foaming) oil. Do not over fill. If there is a sight glass half way is normal. Or if it has a dip stick follow the mark there.
Here is a great link for pressure washer parts and info
This link goes right to oil page:
http://pressure-washer-parts.com/shopdisplayproducts.asp?Search=Yes

Hi this could be the oil and pump seals worn. Also make sure that you don,t have the transit plug in or the pump cannot breath. It should have a air vented dipstick.

aftermarket oil will be fine just use same grade of oil,all manufacturers want that extra kick,

I dont know which comet pump you have, but it is just easier to get a new pump from one of the pressure washer companies on the internet and they sell them on ebay. You can also probably get a better pump that will fit your engine as well. Also, have you tried just changing the oil and not fill it too full? On my 5000 lb washer, if i fill the oil too high when I change the oil, it will foam some. Hope this helps you, Rick