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Old 07-06-2013, 09:40 PM   #1
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Air compressor: low psi


Hey all,
I just purchased a used Brute, 15 gal, 125 psi upright air compressor, model #074003 for $25. I couldn't pass it up. The only problem is, it won't get above 30 psi. The motor keeps running, just won't get above 30. Any suggestions would be greatly appreciated.

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Old 07-06-2013, 09:46 PM   #2
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Air compressor: low psi


Some cause can be the reed valves not seating, cracked, broken.
A leak in the line from the tank to the pressure switch.
Rings or cylinder worn out.

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Old 07-06-2013, 10:11 PM   #3
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Air compressor: low psi


Thanks for your input. I know it's not a leak in the line to the pressure switch because when I shut the motor off, it maintains 30psi. Also, is it normal for air to come out of the breather while it's running?
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Old 07-07-2013, 03:18 AM   #4
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Air compressor: low psi


You are describing a bad set of reed valves---time for a rebuild---
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Old 07-07-2013, 06:46 AM   #5
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Air compressor: low psi


If you order the parts to fix this make sure to order new head and reed valve block gaskets, (two different gaskets) also a new seal for the line that comes out of the head to the pressure switch.
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Old 07-07-2013, 07:45 AM   #6
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Air compressor: low psi


Moved to Tools forum.
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Old 07-07-2013, 07:50 AM   #7
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Air compressor: low psi


A leaking check valve can also cause air to leak out of the tank and out the breather.
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Old 07-07-2013, 12:45 PM   #8
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Air compressor: low psi


Ok, after taking the head apart I think I may have found the culprit. There's a "V" shaped piece (not sure what it's called) that appears to be broken. Is this a reed valve you guys keep mentioning? Is it supposed to be in 2 pieces? Thanks.
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Old 07-07-2013, 01:28 PM   #9
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Air compressor: low psi


Looks like a whole section is missing.
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Old 07-11-2013, 12:14 PM   #10
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Air compressor: low psi


No, it's supposed to be one piece. I'd take a real close look at the cylinder wall and the piston. That broken out piece went somewhere. Almost hard to believe it didn't shatter the head when it broke. It could be lodged in the outlet port from the head. If the cylinder wall is scored or the piston is cracked, repairs may not be worth it.

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