This is a repair of a Dewalt 20v Max DCC020I inflator which stopped working when using a battery. It continued to work using the 12V adapter. I purchased two OEM relays and installed one on the battery line which fixed the inflator.

The only really challenge is not the disassembly, but the desoldering. No lead/high heat solder is used on the PCB and does require work to remove with basic tools. A solder station with a pump would make this much easier. Don't be intimidated though, just be careful and go slowly.

FYI, there is a small plastic wheel just above one of the solder points - remove it temporarily - it does come off. This will provide more room to work.

The relay which was removed proved to be defective when tested with a meter.

The relay parts are as follows:

SANYOU SRG-S-118DM (this one is for the battery line) - I only changed this one.
SANYOU SRG-S-112D (this one is used when the unit is plugged in).

These were purchased from AliExpress for under a $1/each. The total with shipping was under $5.

As far as the pump sensor error (ERR5) that some people have, I only have a suggestion. The original sensor is hard to find, but I do highlight a potential replacement. I have not tried this option, simply trying to offer some hope.

The Dewalt pump sensor is made by mzys-tech.com. The OEM model is M1711. I can't find the exact model on their site. It could have been a custom product for Dewalt/Stanley. There is a M1702 listed (http://mzys-tech.com/acp_view.asp?id=5). The pins might be the same as the M1711. The pins are as follows:

1=V+
2=Vo+
3=V0-
4=GND

There is one replacement that I found which may be compatible and worth a try for those that are courageous. Again, I haven't taken on this repair. The products is WF161S which is around $4 from AliExpress. Manufacturer datasheet is here - (https://www.weifengheng.com/show-97.h.... The pins are as follows:

1=GND
2=V0-
3=Vo+
4=V+

The only issue is that is may not be rated as high as 160PSI (11Bar). Anyway, maybe someone can Frankenstein it together and report back.

Enjoy and good luck.






Dewalt Inflator DCC020 Repair Battery Fix Relay Pressure Sensor DCC020I DCC020IB DCC018 Compressor 20v Max