DeWALT Air Compressor Repair – Replacing the O-Ring (DeWALT Part # A03856)
DeWALT Air Compressor Repair – Replacing the O-Ring (DeWALT Part # A03856)


The O-ring seals the cylinder to the valve
plate. Over time the O-ring can wear and eventually
fail. When it fails air will leak from the cylinder
causing the pump to run but the tank will not be on pressure. Replacing the O-ring is a repair that you
can do yourself and I’m going to show you how. Hi, I’m Mark Sodja. Do-It-Yourself repairs like these are easier
than you might think. From lawn machines to cordless drills, kitchen
mixers, outdoor grill, our how-to videos walk you through each repair from start to finish. Doing it yourself means never having to do
it alone. Let’s get started. Before making any repairs on your air compressor,
be sure to unplug the cord and drain the air from the tank. I’ll begin by removing the top cover from
the compressor. Now I’ll remove the manifold from the top
cover. Now I’ll remove the front motor cover, it’s
secured with one screw on the front side. Once the screws are removed, I’ll use a screwdriver
to release the plastic tabs. Next I’ll remove the outlet tube. With the outlet to removed, now I can remove the head. With the head and valve plate removed, I have
access to the cylinder O-ring. I’ll go ahead and remove it and install the
new one. Now I’ll reinstall the head assembly back
onto the compressor. The head bolts get torched between 84 and
120-inch pounds. Now I’ll reinstall the outlet tube. Now I can replace the rear motor cover, and
I’ll replace the wheel. Now I’ll reinstall the front motor cover. I snap the plastic tabs back into place and secure it with the screws. Now I’ll reinstall the wheel. Now I’ll reinstall the cover and the manifold. I’ll line the cover with the frame and secure
it with the screws. Now I’ll realign the manifold with the cover
and secure it. That’s all it takes to replace the cylinder
O-ring in your air compressor. Be sure to check back often for new videos
and expert advice. If you found this video helpful, give us a
thumbs up and leave a comment.

1 thought on “DeWALT Air Compressor Repair – Replacing the O-Ring (DeWALT Part # A03856)”

  1. homayoun Shirazi says:

    You could have abbreviated your recording by speeding through the unscrewing and screwing time and then demonstrated that the unit was operational and generating the required PSI that it was supposed to produce. Your clip could have been just 5 minutes long instead of 10 minutes. Thanks for the demonstration.

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