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Dewalt Air compressor


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#1 HDWildBill OFFLINE  

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Posted October 03, 2011 - 04:01 PM

I picked up a Dewalt Air compress Model D55155 over the weekend at a yard sale. The motor runs but it doesn't want to pump up the tank. It is rough shape, dirty, paint pelling etc. I have looked at the obvious thing and found the air cleaner plug which I cleaned out then I found a couple of air leaks I fixed but it feel like I'm getting more air out of the crankcase then out the outlet port.

I really don't know much about air compressors so if anyone can give me some guidance I would appreciate it. I did find a manual on it.

Thanks

#2 mjodrey OFFLINE  

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Posted October 03, 2011 - 04:29 PM

Bill,congrats on the compressor.
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#3 olcowhand ONLINE  

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Posted October 03, 2011 - 05:30 PM

Your valve plate may have broken reeds, preventing any pressure buildup. This valve plate resides just under the head. Here's a place to order parts, complete with parts diagram. DeWALT D55155 Parts List and Diagram - Type 1 : eReplacementParts.com
Even if the reeds are the true culprit, I would go ahead & examine the rings/piston/cylinder while you're at it before ordering anything.
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#4 HDWildBill OFFLINE  

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Posted October 04, 2011 - 08:38 AM

Your valve plate may have broken reeds, preventing any pressure buildup. This valve plate resides just under the head. Here's a place to order parts, complete with parts diagram. DeWALT D55155 Parts List and Diagram - Type 1 : eReplacementParts.com
Even if the reeds are the true culprit, I would go ahead & examine the rings/piston/cylinder while you're at it before ordering anything.


Thanks, I thought it might be an internal problem, guess I will get some experience with air compressors. :smile1:

#5 HDWildBill OFFLINE  

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Posted October 04, 2011 - 11:14 AM

The reeds aren't broken but I found a lot of carbon build up and oil. The piston looks in really good shape and there is not scoring on the cylinder walls. Can the reed just wear out without actually breaking?

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#6 Cvans OFFLINE  

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Posted October 04, 2011 - 12:27 PM

They can get warped from excessive heat but that is not very common. It would be more common to have worn rings or stuck rings. In an air compressor that has not been maintained properly heat and ingestion of dirt are usually the culprits. I would look for worn rings and tapered cylinders if it were mine.
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#7 olcowhand ONLINE  

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Posted October 04, 2011 - 02:17 PM

I agree with Chris. After all, you did say there was a lot of air expelling from the crankcase, which says either stuck or worn rings.....likely worn.

#8 HDWildBill OFFLINE  

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Posted October 04, 2011 - 04:50 PM

I pulled it all the way down today and the Oil ring was stuck. I'll order the part in the AM and rebuild the entire top end. Thanks for help.




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