Gas Powered Air Compressor Basics
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- Опубликовано: 12 ноя 2013
- This video gives a simple, concise description of the components on a typical portable, contractor-style, gas-powered air compressor. This simply explains what the components are and how they operate.
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Great info..I'm sure I'm I'm thebonly one who greatly appreciates ya taking time to post this much needed info...good job sir!
Great video. Been looking for something like this. Subscribed.
why my compressor, Hitachi is a gasoline compressor,,, shutoff wen is full air,sometimes won't start again please let me know if I, m can fixed
good stuff. thank you
You're welcome, and we thank you for watching!
How do you adjust the cut out pressure?
this is great while also being relatively worthless at the same time. It would have been brilliant to start at the beginning of the system and work your way through the system in the flow that the air is created and moved and then delivered. Like this is the engine which drives the pulley on the pump and air comes out of the pump here goes through this valve and into the tank here comes out of the tank here through this valve and does this that way someone understood the flow of the air being made and what controls it.
This video was one of the early videos and you're right, could be improved by giving an explanation of airflow, from the beginning. Good point. We will do our best to refilm this video and a few more so they are more explanatory and concise. Thank you for the feedback!
Can someone explain the air flow? Does the check valve have the ability to open and close? If not, it seems air would always travel through the check valve and enter the tank. I've seen some mediocre explanations of how a pilot/check/unloader all-in-one unit work, but nobody seems to be able to explain air flow with these older setups where the check valve is separate from the unloader.
great video, I was wanting to know what you thought of putting a transmission cooler on one. I live in a really humid area and my CH extreme air compressor builds up a lot of water in the tanks so i am thinking about a after cooler. All the videos that I have seen are on electric air compressors.
You certainly can install an aftercooler on the unit to reduce moisture in the airline, and probably should if you live in a humid environment. In addition to an aftercooler, install a gravity water filter aft of the air regulator as well. There are a couple different types of aftercoolers...some are stand-alone units (expensive dessicant dryers) and belt guard-mounted units that resemble an automotive aftercooler with finned piping, allowing to travel a longer distance so it cools down and reduces moisture in the lines. Many compressor manufacturers offer them as accessories, as well as air compressor parts suppliers like Air Compressor Sales (out of Macon, GA for instance).
I Have a gas compressor that when it builds up to pressure and the pilot valve engages the compressor stalls. any ideas on what the problem might be ?
Hello, and thankyou for the video. I have the same compressor for a roofing company of mine and although it has increasingly with time and wear become a bit more troublesum to get started it generally starts after 3 or 4 pulls however today during a job when the rain was on it's way and I needed it the most the damn thing kept stalling out on me! And by that I mean that it would start up, run for 15 sec - 2 min and then the motor would die. My guy that stays on the ground that cleans up during tare offs is for the most part also supposed to keep up with the maintenance on the compressors but since he's a fat lazy piece of sh** he hasn't done anything but eat and poop. (Gross I know) Enough about him, so here's what I know and have tried...I know I'm using the fuel and choke levers correctly, if it's hard to start then I'll make sure I open all valves and release all pressure, I'll loosen the fuel cap just in case of any vapor lock possibilities, there is engine oil (although it could probably need a good changing), there is compressor oil maybe even to much...the bubble is so faded and cloudy and full of "work" that its impossible to see through however after adding a little bit of oil today I noticed that a little bit was squirting out of the cap through the tiny relieve holes at the top so yeah, probably to much but that happened after it was giving me trouble anyway...I'm thinking maybe the throttle control may need to be adjusted but idk because when the unit shutoff and dies after running for a min it shuts off pretty abruptly like if you were to hit the off switch, it's not like starving for fuel or choking out...it just shuts off, kinda like something is telling it to shutoff. Is there some kind of safety something that shuts off the motor if something isn't right with the compressor? I'm pretty knowledgeable when it come to small engines so I'm not just writing this book on RUclips without after troubleshooting this thing with a fair amount of mechanical knowhow first. Any help would be much appreciated!! Thanks in advance!!
Thanks for the info, Justin. This is quite a book but no worries, there's a fix for everything. I'd first bypass the low oil switch. I believe every Honda has one, including this one, so you should be able to bypass it by simply removing the wiring to it. It should be on the crankcase somewhere. If it's not sensing the oil level correctly, the unit will shut down. Also, make sure the pump spins freely by hand without the belt on just to confirm the pump spins freely. Also, make sure the belt isn't too tight or too loose, there should be 1/2" deflection if you press at the center-point of the belt. I'd check these issues first.
Do a review of a 2
Stage 30 gallon w Honda 13 horse.
Mine is converted from a 3hp electric motor to a 212cc petrol engine.
It has throttle control but i didn't use a pilot unloader valve. I used a component that cost less than a fiver.
Good work, and we'd be interested to see what you did use in place of a pilot valve. What did you use to control the cut-in and cut-out pressure of the unit?
I guess you used a push-pull solenoid
Hi. Love your vids. My similar compressor stalls out when the compressor kicks in. Any ideas?
Thanks for the compliment, Morris...and for the watch! Usually this happens if the engine's throttle arms isn't "kicking out" to allow the engine to run at its high speed RPM's. Make sure there is no mechanical obstruction and that the throttle arm can move back and forth freely. Also, check the throttle/idle control valve itself, which connects to the brass pilot valve and kicks the throttle control into high gear from idle. There are two types of throttle control systems...the "bullwhip" cable style and the "airline" style which just uses a hollow nylon tube. If the above two issues check out, then either the pump is seizing or the belt is too tight or too loose (there should be a 1/2" of deflection if you press down on the belt at the center point. Hope this helps!
I have a Rolair GX270 compressor Honda I ned a unloader valve & throttle control.
So do you have to flip that valve over on the pilot unloader valve everytime you want the compressor to pump up?
You technically don't have to flip it every time, no. You can simply leave it in the horizontal (loaded) position and when you start the unit, it'll start pressurizing immediately. The reason why you would slip it to the unloaded (vertical) position is because it make the compressor MUCH easier to start, so it makes life a lot easier as it makes the unit much easier to start first thing.
Can you give part number for pilot valve
My has Kohler 14 hp went out on my Ingersoll rand compressor. Can I install a 22 hp preditor engine from harbor fright also can a bullwhip be installed on that engine????
You can certainly install the 22 hp Predator engine on the unit, yes. It's a bit overkill for the pump on the unit (has more torque which isn't necessarily a bad thing) but it should work. Some modification may be required to install it, but if you have the means to, more power to you! You should also be able to use a bullwhip style throttle control on that engine as well. The bullwhip style should install on most any small engine available (unless it's a very old model).
What is the one black adjustment vavle on the pump it self
I believe what you're referring to is the Oil Breather. That's a black plastic piece that threads into the top of the crankcase and simply allows the crankcase to breathe. Thanks for the question!
Does the air regulator ever go out? I have makita big bore gas driven compressor, and it will shoot sudden burst of high pressure then lower pressure continues.
Yes, the Regulator can stop operating, not allowing much or any airflow through it. It would also be defective if it surges, e.g. allowing bursts of high pressure air and low pressure air through it. You can certainly try replacing it, but also make sure this isn't happening at the pump head. You may want to remove the Regulator completely then run the unit...if you still get air surging (and not a constant flow of air) without the regulator, then the problem lies in the pump itself. Hope this helps!
Hi, if I am understanding this correctly, gas compressors don't have a centrifugal clutch, is that correct? Is the engine turning the pump when you are trying to start it? Does unloading the pilot valve make it possible to start the engine?
Thank you for the watch and the question! You are correct, most every gas-powered compressor like the one shown in the video does NOT use a clutch. The engine does turn the pump on start-up but the compressed air does not fill the tank...instead, the air bypasses the tank and unloads out of the bypass in the Pilot/Unloader Valve, which means the pump dodes not have a "load on it". The pump is "unloaded" when the toggle on top of the Pilot Valve is in the vertical position. Once the unit is started, you flip the toggle to the horizontal position, which "loads" the unit and the air will then fill the air tank.
That is the same compressor i have and it shuts down at 40 psi and no throttle control
One more question I have one just about like this but low and behold the model and serial number is wore were I can't see it my question is this is parts for the pump pretty much all same from diagrams that I have look at they look the same
Thanks for the comment! Unfortunately there are dozens of different pumps used on many different brands of air compressors, so I would be safe and not assume your pump is the same because it looks similar. It may be the same pump, but I would try to get some casting numbers off of the crankcase, head, cylinders (etc.) to identify your pump. Also, you can email some photos of the compressor you have to us if you would like, so we can help you identify it; you can send the email to customerservice@aircompressorpartsonline.com. Thank you!
my roll air compressor wont spin were the belt goes it turns on but struggles to spin?? any idea what it can be?
If the engine runs but the belt isn't driving the air compressor pump
itself, the Belt is probably too loose; you may just need to tighten it.
There should only be a 1/2-in. deflection in the belt, so when you press down with your index finger at the center point of the belt, between the engine pulley and the pump flywheel, there should only be 1/2-in deflection; anymore than than and your Belt is too loose and you'll need to pull the engine and pump farther apart so you can tighten it.
However, first make sure that the pump flywheel turns easily with the Belt off...make sure the pump isn't locked up (or the engine for that matter). Hope this gets you started!
Hi i have a gas compressor that.doesn't build pressure i disconnected the air line that goes from the compressor in to the tank and not air at all .Do you know why is not building any pressure the fly wheel pulley is turning.
Thanks for the question Adan! The problem lies in the pump itself. Most likely you need to replace the reed valves in the pump and gaskets. If the pump is turning and you're not getting any compression, the valves and gaskets are usually the problem. It's possible you need to replace the rings as well but usually a valve kit will do it. If you have a model number I can possibly give you pricing on the valve kit. Also, make sure the belt isn't slipping as this can cause the problem.
Hi my compressor is 8 months and the pump stops working and makes the compressor to turnoff, any suggestion how to fix.
You have a gas-powered compressor, yes? IF it's a gas unit and the unit shuts off when it's not supposed to, most likely it's a problem with the pump or engine throttle control. I would remove the belt(s) from the pulleys and spin the pump flywheel by hand; does it spin freely? Is there any obstruction or metal-on-metal grinding? If the pump turns freely, I would try adjusting the idle speed on your gas engine. It may be that the engine idle setting (or running RPM) is too low. There is an adjustment screw on many small engines where this can be adjusted. If may be that the engine throttle control valve isn't actuating the governor as well. There are quite a few reasons why this could be happening but this should give you a place to start!
I just got one and if It has pressure in the tank I have to completely drain the air out before I can start it again. It that normal?
Thanks for the question! That's not normal, no. It seems as though the pressure isn't unloading off of the pump head (and out of the discharge tube) after the unit fills. The brass pilot valves with the toggle on top should have an "unloader" line routed to it, it's just a 1/4" tube. The pilot valve should "unload" the pressure from a port on the pilot valve into the atmosphere, which makes it easier to kick the engine back into "high gear" to start pressurizing the tank again. Make sure you hear this burst of air for a few seconds after the unit reaches max pressure.
Also, check to confirm the engine and throttle control is working properly. It may be that the throttle control isn't activating the governor on the throttle arm of the engine like it should, so when the unit "unloads" to start pressurizing the tanks again, the engine speed is too low so it's cutting off.
These are a few suggestions that I hope help get you started.
I just subscribed, I was wondering if I can send you some pics of a compressor I have. I can't identify the brand or anything about it, I've searched online and nothing. Thanks for any help ACP.
We're glad to help if we can and thank you for subscribing!
You can email photos of the compressor to our Customer Service team, the email is below:
customerservice@aircompressorpartsonline.com
One of our reps can review the photos and will reply within 48 hrs to see if we can at least I.D. the unit for you.
@@AirCompressorPartsOnline thank you! I really appreciate your help 🙏
How about a gas powered pressure washer? Anything about that different than a compressor?
The main difference between a gas-powered air compressor and a pressure is what the engine is driving. In an air compressor, the engine obviously drives the compressor pump; in a pressure washer, the engine drives the water pump, which is mated directly to the output shaft of the engine.
In a pressure washer, there are no pulleys or flywheels necessary to turn the pump, since shaft of the engine mates to the pressure washer pump's gearbox. Engine maintenance and operation is typically the same with a pressure washer and an air compressor. The air compressor's engine runs at a higher RPM when it is pressurizing the pump (then goes down to idle speed), whereas a pressure washer's engine usually runs at a constant RPM.
We have used our compressor for 31 years, its a craftsman 20 gallon gasoline powered compressor. Here in the last 2 weeks this thing has SHUT DOWN when it reaches max pressure. It TOTALLY shuts off. Is it the check valve or what? Have to get it fixed quickly.
Many gas-powered units don't have a check valve, as they're constant-run units. When the unit kicks down to idle, the air escapes out of a bleeder (unloader) line fitting so it won't continue to pressurize the tank.
If the unit simply off after it reaches max PSI, it's probably an engine problem.
I would check the idle speed setting on the engine governor and clock the RPMs to ensure the idle speed isn't set too low. If that's not the case, make sure the throttle/idle control (which is the line that installs from the pilot valve at the tank inlet to the throttle plate on the gas engine) is actually engaging and pushing the throttle arm back and forth as it should...it could be a simple mechanical problem here.
That should give you a good start on troubleshooting the problem.
@@AirCompressorPartsOnline Wow, thanks a lot.....we will try to check it out.
Ok... Are we just going to ignore.. the fact.. that.. Clark Kent / Superman.. grew a super cool looking beard!!
Why don’t they put a centrifugal clutch on the engine so when the engine idles down it shuts the pump off. I went out and let my compressor cool down fired up the engine and let it idle and was amazed how much heat the compressor pump was making. Very little air flow sadly with these gas compressors. Rol air does seem to have a better flywheel than others
This can be a problem when the unit is run continuously for long periods of time, you are correct. The aluminum pumps with larger flywheels (that have more cooling fins, like RolAir) are a step above many brands because of this. Most units do not use a clutch (although I have seen them) because that would probably bump the price point up and would also involve more moving parts. I'm just conjecturing for the manufacturers, however. Most compressors will get quite hot and run like that without detriment, however. Thanks for the comment!
I cant find the part i need on your site it`s a disaster
Hi, I have a Quincy maybe 20yr old which is 30-40gal and I'm trying to install a Honda GX 390 electric start gas engine on it. How can i make this work?
The basic components you would need will be a Pilot/Unloader Valve (like one in this video) and a Throttle/Idle Control, which connects from the Pilot Valve to the Honda engine's throttle arm, to adjust the RPM of the engine when the pump kicks in/out.
It's hard to say exactly which style of Pilot/Unloader Valve you would need not knowing the exact model of Quincy pump you have, so if you could reply with the model# of the pump that would certainly help me recommend parts that would work for you.
Regarding the Throttle/Idle Control Valve, you can use a bullwhip-style which you can find on our site by clicking on the below link:
www.aircompressorpartsonline.com/index.php?r=product/view&id=3106
Just choose the correct cable length you need and make sure it's for "8 HP and above".
+Air Compressor Parts Online I have a Quincy Model 325. Thanks!
I looking for thro contro .
We have a variety of throttle controls available, depending on the type of throttle control you have and what type of engine you have.
You can view these by clicking on the below link:
aircompressorpartsonline.com/air-compressor-parts-throttle-control-valves-c-25_78.html
Who sales replacement air com tanks?
All manufacturers typically offer replacement air tanks for their units. We sell them as well, but only for certain manufacturers. Tanks tend to be expensive, as is the freight to ship them, so sometimes it's prohibitive. It may be best to try and find a used air tank that's in good shape.
do you have any step by step videos on building a gas operated air compressor with all the components needed except for the engine and compressor please forgive the stupidity
Not a stupid question at all! We do not have a video currently on how to build a gas powered air compressor at this time, but that's one to put on the list! Look for that one shortly. Thanks for the comment!
@@AirCompressorPartsOnline Oh wow this comment was only a week ago ?! I am in the same situation! I have a 60 gallon Husky compressor with an engine sitting on the floor, a gas engine and I have no idea where to begin, if i did id order parts asap !
@@jadensjourneys144 We don't have a video on electric-to-gas conversions yet, but you'll essentially just need a few items. First, the Pilot/Unloader Valve. This has the same function as the on/off pressure switch on an electric unit. It controls when the pump "loads" to pressurize the tank, and when to "unload" the pump (where it idles at a lower RPM.
You can view the various Pilot Valves by clicking on the below link:
aircompressorpartsonline.com/air-compressor-parts-pilot-unloader-valve-controls-c-25_3.html
The second main item you'll need is a throttle/idle controls, which links the pilot valve to the throttle arm on the gas engine. There are a couple different types, a "bullwhip" cable style and the "airline" style, which simply uses a hollow tube (1/4" OD) that connect form the pilot valve to the throttle control valve. You would choose which one you need by the horsepower of your engine and by the length of cable you need (for the bullwhip style). You can view the options we have by clicking on the below link:
aircompressorpartsonline.com/air-compressor-parts-throttle-control-valves-c-25_78.html
The only other item you'll need is possibly an engine pulley. If the shaft size is the same as it is on your electric motor, you won't need a new pulley, you'll probably just need to adjust the RPM of the gas engine so that your pump is still spinning at the optimal RPM range. This is a start so I hope this helps!
Anyone Here Has A Diagram On How To Make An Air Compressor Gas Powered Using The Pilot Valve ?
Thank you for the question! The below video may help you out. You can fast forward to about the halfway point to see how the various components of a gas air compressor work and how they're configured (including the Pilot Valve and Throttle Control Assy):
mastertoolrepair.com/air-compressor-components-and-operation-p-1030398.html
(Master Tool Repair is our parent company). Hope this helps!