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The filter on the underside of the hood on my 335 is packed with dust from age. It appears to be glued to the hood. How are you folks cleaning this filter?
 

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Are you referring to the circular foam "isolator" shown on the parts illustration? I think it is more of an air seal rather than a filter. It allows the engine flywheel fan to pull in air from the vents on the sides of the hood. It is glued to the hood. I would recommend gently brushing off the big chunks with a soft brush and then you could wet it and squeeze it like a foam sponge to remove most of the dirt. Keep soaking with water and squeezing out until it is clean. That's the same way you have to clean the foam filters in some of the new vacuum cleaners.

It would probably be easier to clean if you removed the hood first.

A new foam ring from Deere is $44 but I see you can get 3rd party replacements from Ebay and Amazon for around $28. They have a peel-off sticker and just stick to the hood.
 

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I use a long thin knife and slowly work my way around the base of the filter. It takes a few minutes but it will come off. Then put it in a pan of warm soapy water and let it soak and then squeeze and rinse about five times and the do the same in clear water. Repeat until the water stays clear. Squeeze dry and let it sit for a few days and then take some cement glue that comes in the big can and put some on both the hood and the filter (not a lot but just a streak down the middle of each side). Allow to dry for about ten minutes and then apply them together. Only one chance to get it right so be careful.
 

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With the water hose turned lowish I just soak the foam and squeeze out the water with both hands side by side. Repeat about 50 times and call it good. Carefully cutting it off the hood might be easier. If you destroy it they are surprisingly expensive.
 

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...then take some cement glue that comes in the big can and put some on both the hood and the filter (not a lot but just a streak down the middle of each side). Allow to dry for about ten minutes and then apply them together. Only one chance to get it right so be careful.
Sounds like you are referring to contact cement. The only problem is you may never get it off again.
 

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That could be the case but did you notice I said a little stream down the middle of each side? I am talking about a little line about 1/4 inch wide. If you do that then it is easy to lift up the outer edge and slip a sharp blade into the 1/4 inch line and cut it in the future. Or you can do as RayJay suggests and clean it on the hood. I had thought about using flanged screws all around the filter through a plastic rim to make it removable but decided against it since most of these filters are never cleaned anyway. Notice how JD quit using this filter on later models?
 

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That could be the case but did you notice I said a little stream down the middle of each side? I am talking about a little line about 1/4 inch wide. If you do that then it is easy to lift up the outer edge and slip a sharp blade into the 1/4 inch line and cut it in the future. Or you can do as RayJay suggests and clean it on the hood. I had thought about using flanged screws all around the filter through a plastic rim to make it removable but decided against it since most of these filters are never cleaned anyway. Notice how JD quit using this filter on later models?
Agree. It takes very little adhesive to keep the foam ring in place as it is sandwiched between the hood and the top of the engine.

This really isn't a filter. No air passes through it. That is why the owner's manual does not mention cleaning it. It is simply an air seal to help the flywheel fan to draw cool air in from the hood vents instead of drawing hot air from the engine. So in reality it doesn't matter how dirty it gets.

Later models don't have the foam ring as they have plastic cowls inside the hood which fit closer to the flywheel.
 
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