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Old 06-14-2021, 10:15 AM   #1
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What are these white "Donaldson" filters?

I have 3 of these filters underneath my bus, and I'm not yet sure what they do or if I need to do anything with them. They're all "Donaldson" branded, with different part numbers and slightly different sizes (one picture below shows the larger filter with a skinny one behind it). I assume I'll want to service them but I haven't yet been able to trace them out to determine what system(s) they're attached to, and was hoping I could get a little direction from the gurus.
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Old 06-14-2021, 11:01 AM   #2
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I only see 2 filters in your pictures. The first and second picture show the same filter, which is the one with the black handled thing on the bottom, and is your fuel filter/water separator. And judging by the rust on it, it should be replaced.


The second filter behind it, would be nothing more then a guess as to what it is without a part number. It could be fuel filter as well, or a transmission filter, or something else entirely. Where the lines from it run to will determine the fluid it is filtering.

Do you have a picture of the 3rd filter?
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Old 06-14-2021, 11:05 AM   #3
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Quote:
Originally Posted by Booyah45828 View Post
I only see 2 filters in your pictures. The first and second picture show the same filter, which is the one with the black handled thing on the bottom, and is your fuel filter/water separator. And judging by the rust on it, it should be replaced.


The second filter behind it, would be nothing more then a guess as to what it is without a part number. It could be fuel filter as well, or a transmission filter, or something else entirely. Where the lines from it run to will determine the fluid it is filtering.

Do you have a picture of the 3rd filter?

OK, that gets me going down the right track at least. I had a feeling they were filters for discrete parts, but a cabover bus definitely has these things in kind of diverse locations, so I wasn't sure why they were so far back from the engine compartment.



I'll get better pics of all three later today. The third one is further back from the battery box, these two are to the front of the battery box.
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Old 06-19-2021, 11:13 AM   #4
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It sure looks like they should be replaced. If you pull the part numbers to get new ones the description for the new ones will tell you what they are for. The liquid that runs out when you remove them should confirm their purpose.

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Old 06-19-2021, 04:43 PM   #5
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follow the lines to see where they go and take the guesswork out. if it has a drain its probably fuel and another filter by it is probably fuel also
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Old 06-19-2021, 11:09 PM   #6
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First thing I do when i have a part number and brand is google it. this will tell you what it is.

Next thing I do is document it for future reference.

then i research about that part (in general) to discover its use and what determines a good product from a bad one.

In the OPs, case, not all filters are created equal.
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