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Old 01-18-2022, 10:12 AM   #1
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Location of DEF filter on 2014 Allegro Bus?

I thought it would be easy to find, but I'm not seeing it on the tank or between the tank & the trans (where I read it is on the 2011 Bus).

This is on the 2014 Allegro Bus 37AP. 450hp, ISL, side radiator.

Any assistance would be appreciated.
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Old 01-18-2022, 11:11 AM   #2
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Do you have 200,000 miles on your coach? As per the Cummins manual:
Q. Is any maintenance required on the DEF Dosing Unit Filter?
A.The DEF Dosing Unit Filter will need to be replaced about every 200k miles as part of routine
maintenance
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Old 01-18-2022, 01:08 PM   #3
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Cummins changed that schedule to 2 years or 200k.
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Old 01-18-2022, 02:34 PM   #4
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I think I found it. On the DS.Click image for larger version

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Old 01-18-2022, 05:41 PM   #5
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That was it. I foolishly thought since the DEF tank & muffler are on the PS, the filter would be on the same side.

My filter looked quite clean. I've read where some said their filter was black.
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Old 01-18-2022, 07:58 PM   #6
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Where on the DS is that located???
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Old 01-21-2022, 04:00 PM   #7
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Very close to the air dryer behind the rear axle. Just a little further back and toward the center.



A little challenging to get the old filter to come out, but ultimately the little plastic tool they give you with the new filter works.
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Old 01-31-2022, 08:44 AM   #8
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Replacement def filter

I have a 2012 red with the same Bosch def system. I just had to replace the Def filter. The code that set was 4364-18 catalyst conversion efficiency below normal. I looked up the diagnostics and the first thing to check is the doseing valve so I cleaned it and the opening it sprays into. Then I decided to check the filter. It was plugged! I could not even blow air through it. The original filter was a fine mesh nylon screen type. The replacement is a pleated paper filter. I can see how the replacement filter could last 100k miles but the genuine one did not.
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