Post by: Apples69 on June 10, 2018, 05:07:10 PM
It’s a 2 HP / 25 litre tank. Just recently it started to let all the air out of the tank once it hit the target pressure for the tank.
The air comes out if the black box under the on off switch ( little red button on top of black box ) as per listing below
https://www.autobarn.com.au/powerbase-2hp-25lt-air-compressor-pb-02021 (https://www.autobarn.com.au/powerbase-2hp-25lt-air-compressor-pb-02021)
My compressor engine is reversed on mine to the photo but on off looks the same
Any one got any idea why this happens
Post by: Coolblue80 on June 10, 2018, 05:14:01 PM
This is of course my take on it. I could be wrong.
Cheers, Mike.
Post by: jclures on June 10, 2018, 05:23:58 PM
It might look like this.
https://www.ebay.com.au/itm/QUALITY-AIR-COMPRESSOR-1-2-BSP-CHECK-VALVE-NON-RETURN-VALVE-MADE-IN-ITALY/151957395658?epid=1954931784&hash=item23615dd8ca:g:myMAAOSw5dNWoFwQ (https://www.ebay.com.au/itm/QUALITY-AIR-COMPRESSOR-1-2-BSP-CHECK-VALVE-NON-RETURN-VALVE-MADE-IN-ITALY/151957395658?epid=1954931784&hash=item23615dd8ca:g:myMAAOSw5dNWoFwQ)
Post by: jclures on June 10, 2018, 05:32:06 PM
For example.
https://www.ebay.com.au/itm/G1-2xG3-8xG1-8-Male-Thread-3-Way-Air-Compressor-Non-Return-Check-Valves-2pcs/332097697284?hash=item4d5290b604:g:uzsAAOSwyP5aS5BX (https://www.ebay.com.au/itm/G1-2xG3-8xG1-8-Male-Thread-3-Way-Air-Compressor-Non-Return-Check-Valves-2pcs/332097697284?hash=item4d5290b604:g:uzsAAOSwyP5aS5BX)
Post by: Apples69 on June 10, 2018, 07:08:39 PM
Got nothing to lose so might pull the little black box apart next weekend.
Post by: corndog on June 10, 2018, 07:49:22 PM
Post by: tryagain on June 10, 2018, 08:13:27 PM
https://www.ebay.com.au/sch/i.html?_nkw=air+compressor+pressure+switch (https://www.ebay.com.au/sch/i.html?_nkw=air+compressor+pressure+switch)
Post by: jclures on June 11, 2018, 06:51:16 AM
I could be way off but I thought the black box just housed the electrical components.It unloads the air from the compressor (this is to allow the compressor to restart not under pressure) as well as control the pressure settings
Post by: macca on June 11, 2018, 07:23:12 AM
It unloads the air from the compressor (this is to allow the compressor to restart not under pressure) as well as control the pressure settingsJC is on the money, the valve is the pressure cutoff and unloader for motor restarts. They are easy to replace, two wire's and then just unscrew it from the tank. There is a screw under the cover to adjust the cutoff pressure, it may have to be reset.
Those wires are 240 volt tho
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Post by: Apples69 on June 11, 2018, 07:33:25 PM
Post by: kylarama on June 11, 2018, 08:25:34 PM
It might be there is a valve on the air delivery line, normally screwed into the tank. When this valve plays up, it sticks, and in turn the air is then released into the regulator, making it release the air to the atmosphere.
It might look like this.
https://www.ebay.com.au/itm/QUALITY-AIR-COMPRESSOR-1-2-BSP-CHECK-VALVE-NON-RETURN-VALVE-MADE-IN-ITALY/151957395658?epid=1954931784&hash=item23615dd8ca:g:myMAAOSw5dNWoFwQ (https://www.ebay.com.au/itm/QUALITY-AIR-COMPRESSOR-1-2-BSP-CHECK-VALVE-NON-RETURN-VALVE-MADE-IN-ITALY/151957395658?epid=1954931784&hash=item23615dd8ca:g:myMAAOSw5dNWoFwQ)
JC is right. If air is coming out of the 'black box' after it shuts off the check (one way) valve in the tank is probably stuck open and emptying the tank via the unloader valve in the 'black box'. Give the check valve a few 'Technical taps' to see if it frees up. Or unscrew the pipe that feeds from the compressor head. Have peer inside to see if its stuck open.
I'd look at this before the pressure switch.
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Post by: The punter on June 11, 2018, 09:09:35 PM
Post by: Barrabart on June 12, 2018, 02:20:22 PM
There will be a copper or nylon pipe running to the underside bleed valve on the pressure switch, the other end of this line connects to the non return valve on the air receiver.
You will find that your non return valve is shot, normally a small disc shaped neoprene valve inside the NRV.
What's happening is the bleed valve on the pressure switch is doing it's job, it's releasing the air being presented to it. The problem is if the valve in the NRV is shot, it's allowing air from the receiver to run back out to the bleed valve. The bleed valve is designed to release the air trapped above the NRV, between the cylinder head and NRV.
Pull out the NRV, I bet ya it's stuffed or has something jamming the disc valve inside. :cheers:
Regards,
Barrabart.
Post by: Apples69 on June 12, 2018, 05:09:39 PM
For ten bucks can't go too far wrong and buy a replacement