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MAC5200: safety valve goes off/cut-out pressue does not seem to be working properly. Is there a way I can test/adjust the pressure switch to resolve the problem.

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  • oruggles542 Mar 18, 2011

    Thanks again BillyMac1: I wrote down original cut-in



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Is this cutting out too low or too high, some switches are adjustable, there could be debris or sediment in the switch, if you can take it apart and clean the switch with a spray cleaning solvent try that first.
If you adjust anything write down and make a diagram, count your turns and record them on paper, dont over adjust a pressure switch, they all have a min and max setting, your tank is rated to shut off at a certain pressure limit for safety, increasing it can rupture the tank.

Posted on Mar 12, 2011

Testimonial: "Good Feedback. Seems to kick on fine. The problem is it does not cut-out before safety valve pin pops. I'll try cleaning."

  • Billy Mac Mar 13, 2011

    I work on some industrial air compressors, all air compressors have a rated pressure safety valve to blow when the pressure is too high, sometimes they get dirt in them and the will pop on and off, cleaning them with spray can sometimes fix it, or pulling on the safety valve manual test release ring a bunch of times with a full tank of air can clean out the dirt, it also may be doing its job, there is a pressure rating stamped on most valves, if your gauge is going past that rating fix the min/max pressure switch ASAP! Anything usually over 150 psi is too much for most compressors.

  • oruggles542 Mar 16, 2011

    Thank you. I reviewed specs



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1 Answer

How do I take apart a dewalt d5141 compr3ssor?

This number is for the D20114 its the safety valve that can not be set to a max basic pressure .
its strange but its not adjustable it can be defect i have one time the same the experience there is not a adjustable Pressure Switch on this model , the moast compressors have a 8 to12 bar adjustable.pressure switch.
Very important This safety valve gives an electronic brake between the pump and to a end of top about 10 bar . if its not switching off then a drain valve opened . and blows all the air out. (but only over 10 bar ) the max pressure on the tank , the moast tools are working on a pressure from 6 to 8 bar.

Checking Safety Valve
WARNING: Risk of bursting. If the safety valve does not work
properly, over-pressurization may occur, causing air tank rupture or
an explosion.
Before starting compressor, pull the ring on the safety valve to
make sure that the safety valve operates freely. If the valve is
stuck or does not operate smoothly, it must be replaced with the
same type of valve.
Draining Air Tank (Fig. 1)
WARNING: Risk of unsafe operation. Risk from noise. Air tanks
contain high pressure air. Keep face and other body parts away from
outlet of drain. Use safety glasses when draining as debris can be
kicked up into face. Use ANSI S12.6 (S3.19) ear protection as air flow
noise is loud when draining.
NOTE: All compressed air systems generate condensate that
accumulates in any drain point (e.g., tanks, filter, aftercoolers,
dryers). This condensate contains lubricating oil and/or substances
which may be regulated and must be disposed of in accordance with
local, state, and federal laws and regulations.
1. Ensure On/Off switch (A) is in the OFF position.
2. Move compressor into an inclined position so drain valve (H) is
at the lowest point (this will assist in removing moisture, dirt, etc.
from air tanks)
3. Place a suitable container under the drain valve to catch
4. Grasp black lever on drain valve.
5. Slowly rotate lever to gradually bleed air from air tank.
6. When air tank pressure gauge reads 10 PSI (275.1 kPa), rotate
valve to the fully open position.
7. Close drain valve when finished

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1 Answer

Mac 5200 pumps pressure to 140lbs. then blows off pressure until 120lbs is reached. Cut in is about 115lbs. I have replaced main switch and it still does same. Tried small adjustments on mainswicth st

Check your Safety Valve. It is on the back of the tank sometimes on one of the pressure switch ports or on the air manifold. It has a ring on it to pull to relieve pressure from the tank. The spring in these can get overheated so they don't hold air unless the tank gets over 165 psi. When the motor is running hold the center pin in to see if you have the same results. If the valve holds air until you let it go, replace it.

Jan 30, 2012 | Makita MAC5200 Electric Powered Air...

1 Answer

I have a Makita MAC5200 and the guage is showing 120PSI , tank has pressure, yet I can't get any air from valves. Any suggestions would be appreciated.

Plunger inside the regulator could be stuck or adjustment knob stripped. Let the air out of the tank and take the regulator apart, lube with light grease (no kit available for this reg.). The factory part is expensive so replace (if needed) with generic, careful with size however because there is not much room under the panel and between the gauges . Easy temporary fix. Remove the safety pop valve and install a tee (or check under the pressure switch for spare port) re- install pop valve on the tee fitting. On the second port of tee fitting install a quick connect valve for full pressure. Generic regulator is sold at Lowes that can be installed on the temporary port.

Nov 03, 2011 | Makita MAC5200 Electric Powered Air...

1 Answer

Its a ten gallon 2.0 hp air compressor and it wont cut off when reaching max psi

This is caused by a mis-adjusted or faulty pressure switch. You can start by unplugging the compressor, removing the pressure switch cover (probably where your power cord goes into) and turning the adjustment a bit counter-clockwise ( 2 or 3 turns).

Then give it a test run. If it doesn't seem to adjust, replace the pressure switch.

Jun 03, 2011 | Air Tools & Compressors

1 Answer

When the unit is on and building pressure, the safety valve goes off before it reaches the factory set 150psi pressure. I then lose most of the air and it starts over until the safety valve releases again...

The pressure switch (on / off switch) must be adjusted or has failed. A qualified Bostitch Technician can determine if the switch can be adjusted or must be replaced. Each model is different and without the model number I cannot give you a more precise answer.

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1 Answer

I have a porter cable 6 gal pancake 135 psi compressor. How can I change the cut off and cut on pressure. I've been trying to add air to my car tires and it will not fill the tire all the way up. I was...

where the plug in goes into the pressure switch you can take the cap off and you will see the electrical points and on the inside of the plastic cap it will you show you the two screws to adjust there. one screw will be to raise or lower the min and max pressure equally and the other is to adjust the differential between them. But make sure not to exceed recommended pressure of the compressor or you will blow safety valves, the safety valve will say what pressure it will go off at

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1 Answer

Craftsman 1 HP 8 gal vertical compressor.919

Sounds like the unloader valve is not working properly. The unloader typically is at the end of a tube going to the pressure switch. The unloader is tripped when the pressure switch cuts off. The purpose of the unloader is to bleed the pressure from the cylinder when the compressor cuts off so the next time the compressor cuts on it will be starting in an unloaded condition.
when the compressor cuts off you should hear a discharge of air for about 3 to 5 seconds if the switch is working properly. The unloader can be adjusted if necessary by loosening the jam nuts and adjusting the unloader towards the lever on the pressure switch.

Apr 05, 2010 | Air Tools & Compressors

1 Answer

How do you adjust the pump pressure valve on a Emglo model KU

do you mean the relief valve. it is factory set for your safety and the sefety of the equiptment. also known as the safety relief valve.

if you are talking about working pressure you need to adjust that with the air regulator.

if you are talking the cut out pressure sensor, again this is also factory set for safety. if your equiptment is designed for 110 psi then when your resivor reaches that set point it should cut the motor off and stop running.

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1 Answer

I have a Husky Pro 30 gal a/c. How do I adjust

The adjustment for "Cut-In" and "Cut Out" can be found under the pressure switch cover, if available. Some switches are sealed to prevent tampering that might compromise safety.
If you remove the cover you will see the four electrical connections and one or two screws with springs under them. Most times if the adjustments are accessible you will find a set of instructions under the switch cover. One screw will adjust both the "Cut-In/Cut-Out" pressure and one to adjust the "Cut-Out" pressure only.

However you need to remember some important issues regarding these adjustments. The first is that the "Cut-In/Cut-Out" pressure is set at the factory and is set there for a reason. The only reason to change these is because over time the adjustments can change or you are installing a new switch. The other thing to remember is that the safety relief valve is set just above the "Cut-Out" psi. So any meaningful increase will only trigger the safety valve.

If you need to readjust your compressor back to factory settings make sure you do it with small adjustments. 1/4 to 1/2 turn of the screws. Run the compressor and check both the "Cut-In" and "Cut Out" psi setting before making another adjustment.

Hope this helps, good luck and please be careful.

Dec 12, 2009 | Air Tools & Compressors

1 Answer

I have an air mate air compressor by emqlo and need to know how to adjust the air pressure

Your power cord should go into a plastic box (the pressure switch). Your on/off switch is probably on the same box. Unplug the unit, remove the cover of the switch, and you will find one or two adjusting screws. The main adjustment is usually a silver or gold screw (NOT the terminals with the wires on them).
Turn clockwise to increase pressure, counterclockwise to decrease pressure.
If the differential (the difference between cut-in and cut-out) needs adjusted, there is sometimes a second (usually plastic) adjusting screw behind and to the left of the main screw to adjust the cut-in without adjusting the cut-out.
You won't get the differential any tighter than maybe 25-30 PSI.
Test run while bleeding off a little air, and see if further adjustment is necessary. If so, you can adjust with the power plugged in IF YOU ARE CAREFUL - the wire terminals in the pressure switch are exposed and they will have voltage that can zap you.
Make sure you don't overpressurize (run higher than rated pressure) the unit, or your motor will overload, or the safety valve will pop off.
Let me know if this helps!

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