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Replacement Harbor Freight Compressor Pressure Switch & Unloader Valve Information

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The Harbor Freight compressor pressure switch, unloader valve, and other tips and the Central Pneumatic (HF’s house brand) found below have been filtered from the many contributions from folks that own and use Harbor Freight air compressors and have commented on this model here on about-air-compressors.com.

I sure appreciate that folks take the time to send tips in about the Harbor Freight or Central Pneumatic forum pages for all users. I’ll be adding more tips to this page as new ones come in, and as I find the gems hidden in the hundreds of postings about Harbor Freight and Central Pneumatic air compressors that have already been submitted in the ten years this site has been live.

Tips are listed in numerical order by model number.

For general information on Harbor Freight and access to Harbor Freight Air Compressor User Manuals take a look at this page.

Table of Contents

Tips for Harbor Freight Model 47065

Also suitable as Central Pneumatic Air Compressor Pressure Switch replacements!

Troubleshooting your Air Compressor Pressure Switch? Take a look at our handy guide to compressor pressure switches before buying a replacement.

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Replacement Pressure SwitchLink
ESUMIC 90-120PSI Air Compressor Pressure Switch Control Valve Regulator with Gauges for Fast Pressure Reduction
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Air Compressor Pressure Switch Control Valve 90-120 PSI 240V
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Replacement pressure switch for Harbor Freight Model 47065

from Matt

Just ordered one from an Amazon store (Wessel) located in KY, not China. Cost $9.18, no tax or shipping, and will be here in a few days. Here’s the info: “New Heavy Duty Air Compressor Pressure Switch Control Valve 90 PSI -120 PSI ESUMIC” and it lists a 3-year warranty!

Central Pneumatic 447065 Air Compressor
Central Pneumatic 447065 Air Compressor

Another replacement pressure switch option for model 47065

from AZBen

A similar switch with fulfillment by Amazon, meaning they have it at their warehouse already. You should get this one for a couple of dollars more in only a week or less. Only two days for Prime members. https://www.amazon.com/Compressor-Pressure-Switch-Control-90-120/dp/B008QV2O8G

Make a diaphragm for a for Harbor Freight Model 47065 pressure switch

from Azben

I made the diaphragm from a bicycle inner tube cut square with scissors and punched with a small leather punch tool on hardwood backer board. Reassembly is easier if you clamp the spring to keep it from pressing everything open. I used two medium-hand spring clamps.

If you wish to learn how to adjust air compressor pressure switch control valve, visit our detailed page for more information!

Tips for Harbor Freight Model 61454 Air Compressor

Found reed valve for Harbor Freight / Central Pneumatic model 61454 – but not at HF!

from Bob, Salinas Ca.

Replacement reed valves for this model can be bought at Sears, part number E100229, for $4.59. If you can’t buy them at Sears, they’re also available on Amazon.

Tips for Harbor Freight Model 94667 Air Compressor

Gaskets for Harbor Freight Model #94667

from Anonymous

Found the gaskets for the 94667. Campbell Hausfeld and Husky model HL4000 are exactly the same as the #94667. Whoever makes the compressor obviously sells them to several retailers. You can buy the head rebuild kit HL026100AV for less than $25 on eBay or lots of other websites. It includes all gaskets, reed valves, and the head plate. And I’m guessing other HL4000 parts will fit on the #94667, too. I know this works, just did my #94667 and now it pumps right up and shuts off.

Air intake filter for the Harbor Freight / Central Pneumatic 94667

from Corn Dog

HL026100AV CAMPBELL HAUSFELD and HL4000 Husky – These two compressors both have the same parts… You can find the parts on eBay… Hope this helps.

Tips for Harbor Freight / Central Pneumatic Model 95275

Regulator issue resolved for Harbor Freight model 95275

from Don Andersen

Wasn’t getting any air out of the coupler. …I realized that the end of the white plastic plunger inside the regulator was not long enough (was no longer long enough) to push the spring-loaded valve open to let the air out of the tank and to the quick coupler. So I put a little 1/8 inch diameter piece of a gasket material in there and it works fine. I suspect the plastic deformed a little in four years or the rubber plug it goes into. Maybe a person should back the regulator valve off when not in use. P.S. Your book is great.

Tips for Harbor Freight Model 99781 Air Compressor

Rebuild parts for a for Harbor Freight model 99781 air regulator

from Piddler

Model 99781 Air Regulator (built into the manifold)Impossible to find a rebuild kit for it. Harbor Freight customer service tried but could not ID my 6-year-old unit. Solved by replacing existing manifold with Couplings and Tees with inexpensive regulator ‘in-line’ between tank gauge tee and the ‘regulated flow’ gauge tee. I relocated the pressure relief safety valve to the 1st tee which connects the incoming tank line and tank pressure gauge mounted on end. Had to cut a hole in the cover housing. The tee is ended where mounting was a little odd but it works fine.

Tips for Harbor Freight Model 40400

Location of reset button on Harbor Freight 40400 Air Compressor

from Brendon Holt

For those who are wondering the Reset Button is hidden under the Shroud (Large Plastic Cover). The wires come into a Reset Switch. To get to it you need to Remove 4 Phillips Head Screws, Two on Top, and Two on the bottom. Looking from the front it is on the Left Hand Side (Label Side).

Central Pneumatic 40400 Air Compressor
Central Pneumatic 40400 Air Compressor

Harbor Freight Air Compressor Unloader Valve Tips

We’re pulling together some Harbor Freight and Central Pneumatic Unloader Valve tips. In the meantime take a look at our ultimate guide to air compressor unloader valves. You’ll find handy tips on how to troubleshoot unloader valve issues, as well as common tasks such as how to install an unloader valve and how to adjust an unloader valve.

If you’re left wondering what is an air compressor unloader valve, don’t worry we answer that too!

By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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