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DeWalt Compressor doing something odd...Help Needed!

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Forum topic by DeanG posted 471 days ago 483 views 0 times favorited 7 replies Add to Favorites Watch
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DeanG

11 posts in 1328 days


471 days ago

Topic tags/keywords: compressor

OK I’m hoping you guys can help me out here.

A few weeks ago I went to use my DeWalt D5514 compressor and it started acting odd on me. When the Tank Pressure and the Regulated Pressure gauge hit the same level the valve on the side blows open. It then lets all the pressure out. No matter how low I set the regulator dial it does this.

Any ideas what it is and how to fix it?


7 replies so far

View REO's profile

REO

541 posts in 573 days


#1 posted 471 days ago

your differential switch is set to high so the safety blows. it is probably sticking closed. if it has been run on a light gage extension cord it is possible the contacts are pitted and sticking. It is possible the switch is full of dust and needs to be blown out. if you are in a cold location they can be affected by moisture inside the diaphragm as well.

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joein10asee

2756 posts in 506 days


#2 posted 471 days ago

If it is the points sticking, you can slide a bit of fine grit wet/dry sandpaper thru them to clean ‘em up.

-- Perform A Random Act Of Kindness Today ... Pay It Forward

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DeanG

11 posts in 1328 days


#3 posted 471 days ago

Guys, thanks for the responses.
But let me show my ignorance for a moment…. what contacts or switch?

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ajosephg

1826 posts in 2060 days


#4 posted 470 days ago

Are you saying that the safety valve goes off when the “regulated” pressure is reached even though the maximum tank pressure has not been reached?

For example: The max tank pressure is 200 psi, and you have the regulated pressure set at 100. You turn the compressor on, the pressure builds to 100 and the safety valve opens and drains the tank. If you reset the regulated pressure to 80, when the pressure builds to 80 the safety valve opens and drains the tank.

If that’s what is happening, I don’t think it is an electrical problem.

-- Joe

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DeanG

11 posts in 1328 days


#5 posted 470 days ago

“If you reset the regulated pressure to 80, when the pressure builds to 80 the safety valve opens and drains the tank”

This is whats happening. No Matter if I set it at 75, or 200. When the needles are at the same amount the valve blows until empty (or I push it back in), then it builds back up and blows again, and the cycle repeats itself ad nauseum.

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ajosephg

1826 posts in 2060 days


#6 posted 470 days ago

Weird. I have a Porter Cable that is similar except it has a larger vertical tank. I’m watching football tonight, but the next time I go to my shop and have a chance to look at instructions and stuff I’ll see if I can gin up a theory.

I would think that the master safety valve (if that is what is popping) would be totally independent of the adjustable pressure regulator.

-- Joe

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ajosephg

1826 posts in 2060 days


#7 posted 470 days ago

OK, I’m in the shop and it turns out my compressor is a Campbell Hausfeld which is no big deal because they make most of the home compressors.

Based on my compressor, the Safety Valve cannot be the problem because it is totally independent of the pressure regulator and is spring loaded so when the pressure gets below x psi it closes automatically unless held open with your finger.

You might want to look at the Unloader Valve whose purpose (I think) is to release the pressure on the compressor so it doesn’t have to start under load. Doesn’t seem like this part of the unit would have anything to do with the output pressure regulator.

Another possibility is that the regulator has got something wrong in that it dumps air when it reaches the set point.

-- Joe

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