Question about Makita MAC2400 Electric Powered Air Compressors

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New Pressure Switch too big to screw onto tank?

I just ordered a replacement oem pressure switch. It did not come with any directions. I was able to unscrew the old part as I had taken the top off (mistake as it came totally apart and I could not figure out how to put it back together). With the top part of the pressure switch still screwed down, the part looks too tall to rotate back onto the bottom tank. Do I need to remove the motor shroud, or is a way to take the top part of the pressure switch off without all the parts of the on/off mechanism falling out? Thanks in advance for any input. Jeff

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  • 1,388 Answers

I usually install/add a union to bottom of pressure switch.. I makes it easy to remove and re-install the switch later if needed. Unions come in brass or steel and sold thru all lumber /plumbing stores. Good luck with your repair.

Posted on Apr 06, 2015


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: How to put the pressure switch back together?

Without having a look myself its a little difficult to know where the black plastic plate comes from. There are so many tiny parts in those things.

But normally when you have air coming from the pressure switch, it usually comes from the check valve, that is located at the other end of the pipe which attaches from the pressure switch to the tank, where it fixes to the tank, is where the check valve is. When there is no pressure in the tank, unscrew it, clean it up or replace it, then that should solve your air leak.

As for the pressure switch, either you need an exploded view of it so you can see where the plate goes, or you may have to replace it altogether

Posted on Aug 07, 2012

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1 Answer

Bostitch CPACK300 Motor won't cut off!

First; most repair centers, mine included, are reluctant to instruct users on how to adjust compressor settings because of the dangers of setting levels to high and risking tank ruptures. 15 to 20 psi is considered explosive pressures so when you are dealing with 135 to 150 psi or higher, you have to be able to understand and respect the dangers.
Second; if your compressor was working properly and now isn't and no one changed the setting of the pressure switch, it is more likely you need to replace the switch. If the spring or other mechanisms that controls the pressure the switch turns the motor off and on are damaged or broken they need to be replaced.
Lastly; at your own risk, most pressure switches have directions inside the cover on how to adjust the cut-in and cut-out pressures. I have never seen one that requires special tools, usually a screw driver or nut drive will turn the adjustment screw. When adjusting the screw, turn the screw in half turn steps and cycle the motor at least twice between adjustments to check where the switch is cutting in and out. If your switch does in fact require a special tool you will have to see if it is something the repair center can sell you or take/ship the compressor to them for repair.

Oct 08, 2012 | Stanley Bostitch CPACK300 3-Tool Finish &...

1 Answer

I have an old 5hp 20 gallon horizontal Craftsman air compressor that is well over 20 years old. The on off presure switch died so I replaced it with a Powermate unit of the same on - off pressure...

possibly an installation problem
most control units screw directly into the tank and the pressure is read directly to the diaphragm that controls the switching
check if the bleeder line is supposed to be attached to the control unit at all
unless you have a peculiar set up the compressor line goes to a nonreturn valve into the tank
there is a relief valve in the tank that blows off when dangerous pressures are reached ( around 120 psi)
there is a fitting where the control screws in and that reads tank pressure to control the on/off of the motor

Apr 17, 2017 | Craftsman Air Tools & Compressors

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Compressor runs to 175psi but trips pressure relief when pressure drops tries to restart motor but motor wont turn blows breaker. changed whole pressure switch have same problem.

The problem is lilkely the check valve between the compressor and the tank -- it is alowing pressure to build from tank to compressor preventing the compressor from turning over. Clean, maybe replace, check valve...


Jan 09, 2011 | Craftsman 25 gal Air Compressor 3 12 hp...

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The high pressure unit is disabled in my Robinair Cooltech 34700z wat could be the problem?

This is a common problrm of Robinair 34700Z / 347002k & 347112k series don't worry just do the following :- 1# Verify the ISV tank is not overfilled.if full,remove refrigerant manually from tank. 2# Verify if there is high pressure in the tank.Purge excess air from the tank manually.( Open air purge hose from the tank,then press tank valve as needed) 3#Check the high pressure switch for proper operation,if not then replace high pressure switch.Hope this will solve your problem, if so please vot for it

Jan 04, 2011 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

How do i set the low pressure on the flotec switch

your pump should have a 20lb seperation ie. pump turns on at 20lb and off at 40lb or on at 50lb off at 70lb. under the cover of the switch theres two screws with springs under them.dont mess with the small one.the large one if you screw it down (right) will increase the pressure while maintaining the 20lb separation. one thing to keep in mind its fine to adjust the pressure BUT at the same time the air pressure in the tank needs to be adjusted to two lbs below the cut in pressure of the pump.

I believe the directions are in the top of the cover of the switch

Jan 02, 2011 | Flotec TC2151 P2 Well Pump Pressure Switch

1 Answer

Pump cycles like crazy!!

Sometimes a new tank the blatter will be kinda sealed to the sides of the tank.the amount of air in the tank s/b equal to the cut in pressure of the pressure switch.(40 lb) that would be (60 lb) cut out if you messed with the little screw on the pressure switch you have a problem.there must be the 20 psi of differance between start and stop.

May 13, 2010 | Flotec Corrosion Resistant Shallow Well...

1 Answer


STOP! Your pressure switch is doing what it is supposed to, but the tank check valve is leaking. This valve is usually at the tank where the line from the compressor head enters the tank. The small tube line from the pressure switch probably also goes to this valve. You'll need to clean or replace it.

Nov 14, 2009 | Air Tools & Compressors

1 Answer

I have a model C48A93A06 1/2 horse power pump motor and it pumps water fine,but, it will get within 2lbs of the cut off pressure and just sit there and run and will not cut off unless I bump the pressure...

I would check the holding tank pressure, if you have one with a bladder. Turn electric off to the pump, and drain all water from the tank. Take a tire pressure gauge and check the tank pressure at the air valve on top of the tank. That pressure should be two lbs less than your cut-on pressure. If the cut-on pressure is 20 lbs, then the tank pressure should be at 18 lbs. If there's too much pressure in the tank, it wont let the pressure switch work correctly. If you get water from that air valve, then the bladder is ruptured, and a new tank is needed.
I hope this works for you!

Aug 09, 2009 | Plumbing

2 Answers

Leaking Pressure Switch

Leaks at the pressure switch are usually associated with the unloader valve due to leaking checkvalve at the tank. To determine the faulty part requires a couple of tests. Run compressor till it shuts off and is full of air then unplug the unit. Spray soapy water or (windex) around the base of the pressure switch to find where air is leaking from. There is a rubber diaphragm incorporated into the base of the pressure switch that may develop leaks. If the base is leaking check for loose parts or screws. If the air is leaking from a valve that looks like a tire stem, then leak is a result of faulty check valve in tank. Follow the 1/4 tubing that is connected to the pressure switch down to the brass valve at the tank. This brass valve is not holding tank pressure causing leak at the pressure switch. Replace as neccessary. The pressure switch is expensive. Do not replace unless you have looked at checkvalve. A universal pressue switch can be and should be used to same money. The check valve need not be replaced with exact replacement. Universal parts are available at . Just match tubing and thread sizes and pressure range for the switch. Good Luck on your project and email if you have more questions. Please wait for the soapy water or windex to dry before you plug in the unit.

Feb 12, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

3 Answers

Alto Force Kew washer stopped working.

To remove the cover, undo the two screws holding on the equipment tray on the handle. Then turn upside down and undo the two screws on the bottom. You will need a very long handled screw driver to reach into the deep recesses. I think they may to TORX screws (working from memory and has been a while since I pulled one apart). The blue cover will now pull off. The only trouble you may have is that the bolts are ordinary black steel ones and may have rusted through

Most likely fault is that the pressure switch has failed open. A combination of dirty water leaking past the seals and rust will eventuall jam the switch. The switch assembly is the white plastic part directly bolted onto the pump. A plunger is pushed by the pump when it is up to pressure which trips a micro switch and turns the power off. You will need to replace the complete pressure switch which is about $60. If you take care the micro switch assembly can be removed and then put back onto the new switch. If you break it, then another $40.

Nov 15, 2008 | Garden

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