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racer10's avatar
racer10
Explorer
Nov 01, 2013

New Onan 2800 Generator

I have a new 2014 210 Popular Chevy equipped with the latest state of the art Cummins generator...... wait... read on!! Yesterday I decided to change the oil. First thing I noticed was that the outside cover is different. You will need a screw driver to unlock the cover to access the dip stick. To change the oil you will need a 9/16 socket wrench with a short extension. Now here is where the fun begins. When the drain plug got to the point of release (the drain plug is on the bottom of the unit so when it releases it will fall to the ground or is supposed to! LOL) down poured the oil and the drain plug flew into the bottom cover surrounding the access hole. Now to be more specific, there is a cover on the bottom of the generator that is about an inch or so below the drain plug and the entire generator. To access the drain plug, there is a round opening just wide enough to get about two small fingers up to the drain plug, but barely. To make it even more fun, there is a lip surrounding the access hole that keeps anything from coming out the hole. My drain plug was sitting on the area surrounding the hole but I couldn't get my fingers up in the hole to grab the drain plug. The lip around the hole made it impossible to retrieve the plug. For the next hour I tried everything possible to grab a hold on that drain plug. It's made of brass so a magnet didn't work. Finally, I used a surgical tool that I happened to have with curved ends and I was able after several tries to grab hold of the plug, lift it over the lip and out the hole. Now.. read on. It's get better.

Pouring the oil in the fill hole: The fill hole is about two or three inches into the unit and on an angle and the fill hole is small. Now.. how do I get oil in that fill hole?? hahaha I happened to have a small funnel and I attached a 4 inch rubber hose to it and inserted it into the fill hole. As you know, you must lie on your back as you are doing all this and the funnel, after inserting it in the hole, is near the top of the coach, not much room there to get a bottle of oil angled to fill the hole. This was another ten minutes to do this because of the angles and the fill hole being too small to accept just a small amount of oil at a time.

Now this project which should only have taken 15 minutes ended up taking about 2 hours. I can't imagine in my wildest dreams what the engineers at Cummins were thinking when they designed this new generator. On top of all this, the generator is extremely noisy, much more than the previous model. Regarding the drain plug hole, all the engineers had to do was make the access hole on the bottom cover about an inch or so wider and it would have made all the difference in the world to access the drain plug. And I would personally like to see the engineers try to put oil in that fill hole!!! The design is about as unfriendly as it gets. All they had to do was extend the fill hole out near the outside of the unit and it would have been at least easier to access.

I called Cummins and they had no answers for me regarding all this. The Cummins engineers get a big fat "F" for the design of this new unit. Apparently they have no common sense on how customers must deal with these units. Good luck to all of you dealing with this if you buy a new Roadtrek with a Cummins generator.
  • drsolo wrote:
    flexible pick up tool


    hahaha I have one of those tools. I thought about using it but that tool would never get in that small plate hole up over and down the lip to that drain plug. I could get my fingers on it but I couldn't get it over the lip and I kept trying on and off for about a half hour. BTW, the drain plug is brass so no magnetic tool is going to pick that thing up.
  • Pauljdav wrote:


    BTW why change the oil already?

    Paul


    Cummins recommends changing the break in oil after 20 hours I believe. Regardless, I was over the limit when I checked the manual, so it was over do.
  • Sounds like the same Cummins design I've had on 2 previous RV's. It takes 1 oil change to figure out the correct tools you need to have to get it done with less mess.
    1 qt. is not a whole lot of oil to gush out. Change the oil on a V6 Sprinter. There it's 13 qts. (admittedly alot easier to get to with more room)

    Anybody tried a Fumoto valve on these generators yet?
  • The pump does sound like the way to go. I have a Yamaha 9.9 outboard and when you pull the drain plug oil splashes everywhere no matter what I think I will use the pump next time.

    BTW why change the oil already?

    Paul
  • well, yes you would think the plug would come out with the socket but you have to remember that when the plug releases, a ton of oil comes rushing out of the escape hole downward all at once. When that happens, you have to get your hand and tool out of the way fast or you get your hands, arm and clothing soaked with hot oil (assuming that you ran the generator before draining the oil as recommended by Cummins ). Looking out for the drain plug is the least of the worries when oil is going everywhere at once. This is compounded by the fact that the plate hole is very narrow so getting the wrench and socket out of there quickly is not easy. If the access hole on the bottom plate were an inch or two wider it would make the deal 100% easier. I can't imagine how this design ever saw daylight at Cummins. And the fill hole also. Don't these engineers put these units through testing to see if the designs work and are friendly? It's just amazing to me that they have a product on the market that is so user unfriendly.
  • Penzoil makes a little pump with a hose, you just screw it on the top of the oil container and pump the oil in. Really easy. As for the plug, it would seem it would come out in the socket, but then I would have to see a photo.