Old Sears Air Compressor - Help Please
EW wrote:
My OLD 220 Volt Sears air compressor (model # 106.15378) with twin cylinders recently quit being able to compress more than about 65 psi into the tank. At that point, the motor still runs, the fan belt starts to squeal, and the cylinders will no longer run. I can't even "turn" the flywheel by hand. Lowering pressure a lot lets it run again. I'm assuming something (reed valve??) is causing the high pressure air to "work" against the cylinders so hard that they will simply not pump. (I wonder if storing the compressor in my hot Texas shop -- 140 degrees in mid PM -- contributed to this!) Any ideas? "IF" it's a reed valve, is it accessible at the top of the cylinder block? Is there a difference between the "input air" and output air" reed valve? Can I fix a reed valve? ANY comments would help!! Thanks. EW you have two valves in almost all compressors: one is the load valve, after the compressor pumps up and cuts off the machine makes a whew sound.. like air escaping for a few seconds..its a blast... that is to take the load off the head so it can start pumping next time when it is time for the compressor to go again.... the other valve is the check valve.... it stops the air from coming back from the tank back to the compressor.. it holds the air back so the motor can turn the crank...... a new check valve cost about $15.00 yours might be leaking and when getting up to 65 lbs. it will not hold back any more??? if that is the case(when mine went bad it would blow out the fuse for the elect. service.... was drawing about 50 amps. or more............ is your belt tight??? do you have oil in the compressor?? too much oil??? how about taking the larger tubing off where it goes into the tank(the check valve is right there..where the tubing goes into it... and run the compressor.. it will not go up in pressure as the output of the compressor is just pumping air into the atmosphere and not into the tank... let it run for the same amount of time and see what happens...does it slow down??? or kill??? if not that its the check valve... if it still slows down or kills then its the pistons in the cylinder block that are swelling up due to friction and you might have problems????? hope for the best... either sears or any pump replair shop can sell you a check valve... the unloader valve at sears is part of the whole diaphram valve that controls the pressure from the tank.. i could not get one from sears.. you had to buy the whol thing.. so i went to a pump repair place.. they fix air compressors and got one there for about $15.00 also... these valve are pretty standard sized and interchangable for most compressors... hope this helps. |
Old Sears Air Compressor - Help Please
jim wrote:
EW wrote: My OLD 220 Volt Sears air compressor (model # 106.15378) with twin cylinders recently quit being able to compress more than about 65 psi into the tank. At that point, the motor still runs, the fan belt starts to squeal, and the cylinders will no longer run. I can't even "turn" the flywheel by hand. Lowering pressure a lot lets it run again. I'm assuming something (reed valve??) is causing the high pressure air to "work" against the cylinders so hard that they will simply not pump. (I wonder if storing the compressor in my hot Texas shop -- 140 degrees in mid PM -- contributed to this!) Any ideas? "IF" it's a reed valve, is it accessible at the top of the cylinder block? Is there a difference between the "input air" and output air" reed valve? Can I fix a reed valve? ANY comments would help!! Thanks. EW you have two valves in almost all compressors: [.....] you might have problems????? hope for the best... either sears or any pump replair shop can sell you a check valve... the unloader valve at sears is part of the whole diaphram valve that controls the pressure from the tank.. i could not get one from sears.. you had to buy the whol thing.. so i went to a pump repair place.. they fix air compressors and got one there for about $15.00 also... these valve are pretty standard sized and interchangable for most compressors... hope this helps. Grainger sell unloader valve, his would cost under 10bucks for an inline. --Loren |
Old Sears Air Compressor - Help Please
I believe your problem is caused by a broken or leaking outlet reed valve in
one cylinder. This would allow the pressure from the other cylinder to pressurize that cylinder at the bottom of its stroke and cause excessive pressure buildup when the piston moves up. On many compressors the reed valves are on a plate under the head and are very easy to get to. They may be hard or impossible to remove from the plate because the small thin heads of the securing screws may be corroded. You may need to grind off the end of a socket to remove any bevel. The valves and screws can be bought, perhaps in a kit, but you may need to replace the entire plate. Don Young "EW" wrote in message ... My OLD 220 Volt Sears air compressor (model # 106.15378) with twin cylinders recently quit being able to compress more than about 65 psi into the tank. At that point, the motor still runs, the fan belt starts to squeal, and the cylinders will no longer run. I can't even "turn" the flywheel by hand. Lowering pressure a lot lets it run again. I'm assuming something (reed valve??) is causing the high pressure air to "work" against the cylinders so hard that they will simply not pump. (I wonder if storing the compressor in my hot Texas shop -- 140 degrees in mid PM -- contributed to this!) Any ideas? "IF" it's a reed valve, is it accessible at the top of the cylinder block? Is there a difference between the "input air" and output air" reed valve? Can I fix a reed valve? ANY comments would help!! Thanks. EW |
Old Sears Air Compressor - Help Please
In article ,
EW wrote: "jim" wrote in message ... EW you have two valves in almost all compressors: SNIP............ Jim, may I ask another set of questions about the valves! My compressor's twin cylinders flow compressed air out the large tube to an "assembly" prior to the tank. This assembly has a vertical "safety valve" and an electrical gizmo that tells the motor to shut off at a certain pressure (mine is 125 psi, and has worked there until recently). Then the assembly's output goes to the tank. Hmm ... not like my old Sears compressor -- a 12 gallon two-cylinder (but not two-stage), with a combination controller switch and a regulator. The big line goes from the cylinder head directly into the tank, and a separate line comes back out of the tank to the regulator/switch. A smaller line goes from the cylinder head to the regulator/switch, and that is what vents the cylinder to air when the switch commands "stop". The safety overpressure valve is screwed into one side of the regulator, and the output connection into the other side, both facing out towards the operator. OK. Is the "load valve" that you talked about at the cylinders' head assembly, where I may get to it easily, or closer to the tank at the other assembly? I assume the "check valve" is in that lower assembly somewhere, and it will be a bear to take off. I think that the check valve is in the head of mine (as one of the two reed valves) and the load (or unloader) valve is in the switch/regulator assembly. IF the load valve, which I hope is the problem, is on the head above the cylinders, then I will try that first. I should be able to see something wrong, if that's the problem, right? What I would suggest that you do (and what I did when I discovered that the regulator fed out tank pressure no matter what the setting) is go to the Sears web page, and spend some time chasing down the service section which gives drawings for the various assemblies for the different models. Those drawings told me enough about how my regulator/switch was made to guide me in the disassembly, cleaning and reassembly. It had some white corrosion in it from long-trapped water. I scraped that clear, and added a touch of light oil to the moving parts, and it now works just as it should. Note that it was only the regulator which was misbehaving on mine. The shutoff switch stopped the compressor at 100 PSI as it should. So -- go to the http://www.sears.com page, download the images and print the screen to save a copy. You know -- one other possibility with this, since yours is a 220V one, and something which hit someone else in the newsgroup recently. Someone had wired a new power cord onto the motor, and somehow wired it so the 220V motor was actually getting only 110V. :-) Good Luck, DoN. -- Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
Old Sears Air Compressor - Help Please
In article , jim wrote:
EW wrote: "jim" wrote in message ... EW you have two valves in almost all compressors: SNIP............ Jim, may I ask another set of questions about the valves! My compressor's twin cylinders flow compressed air out the large tube to an "assembly" prior to the tank. This assembly has a vertical "safety valve" and an electrical gizmo that tells the motor to shut off at a certain pressure (mine is 125 psi, and has worked there until recently). Then the assembly's output goes to the tank. OK. Is the "load valve" that you talked about at the cylinders' head assembly, where I may get to it easily, or closer to the tank at the other assembly? I assume the "check valve" is in that lower assembly somewhere, and it will be a bear to take off. the unloader can be integral with the pressure sw assy or seperate, it depends entirely on the design. in either case, it vents the pipe that supplies air from the compressor head. this valve will never be at the head or in the head casting. IF the load valve, which I hope is the problem, is on the head above the cylinders, then I will try that first. I should be able to see something wrong, if that's the problem, right? Thanks a million for your patience and knowledge. And, sorry! EW the unloader valve is about 1/4 inch wide, real small, with what looks like a staight pin stiling out the bottom.. on my 1 hp. sears air com. if you see this "pin", you have an integral unloader. it can be replaced, cleaned or bypassed. a new one is included with a new pressure sw assy. often it is easier (if cleaning doesn't help) to add an inline unloader. lots of good advice in the thread, so you have no excuses now, let us know when you get it fixed. good luck, --LOren it is on the rt. side(OK, i know, thats not much info.. but when you turn the crank on the side to turn the compressor off by hand this piece of bendt metal hits a piece of metal and this hits the bottom of the unloader valve... the unloader valve is screws right into the end of the small 1/4 in. tubing that comes from the compressor to the tank area... you probably have all the plastic covering still on the compressor??? it has to come off so you can see whats happening... and no the valve that you described does not bother the large tubing that goes straight to the compressor.. on mine the check valve screws right into the tank just next to the assembly that you mentioned(and the unloader valve is attached to the other side.. with your model number yuou can go on sears web site and enter the mod. number and check for parts.. then you can get a diagram of the air compressor....if the tubing breaks off, like it happened on mine. i just went to ace hardware store and bought some copper and another brass fitting and put it on.. the old alum. tubing might be brittle..... |
Old Sears Air Compressor - Help Please
On Wed, 13 Aug 2003 16:14:17 -0500, "EW" wrote:
My OLD 220 Volt Sears air compressor (model # 106.15378) with twin cylinders recently quit being able to compress more than about 65 psi into the tank. At that point, the motor still runs, the fan belt starts to squeal, and the cylinders will no longer run. I can't even "turn" the flywheel by hand. Lowering pressure a lot lets it run again. I'm assuming something (reed valve??) is causing the high pressure air to "work" against the cylinders so hard that they will simply not pump. (I wonder if storing the compressor in my hot Texas shop -- 140 degrees in mid PM -- contributed to this!) Any ideas? "IF" it's a reed valve, is it accessible at the top of the cylinder block? Is there a difference between the "input air" and output air" reed valve? Can I fix a reed valve? ANY comments would help!! Yeah, you probably have a broken output reed valve. That's letting one cylinder pressurize the other when its piston is at the bottom of its travel. Effectively the compressor is trying to be a two stage compressor, but the system isn't designed for that. So when you hit 65 PSI, the second cylinder is actually trying to pump 130 PSI, and it can't. The problem can't be the unloader because the compressor starts and runs for a while before stalling. It can't be a stuck check valve because some pressure builds in the tank. The reed valves are mounted in a plate under the head. Generally there'll be enough corrosion that you won't be able to remove and replace only one reed valve. You'll have to replace the plate and valves as an assembly. Gary |
Old Sears Air Compressor - Help Please
"Loren Coe" wrote in message ... Thanks Loren. As you say, I have all the info I need. If only I had more mechanical skills....!! Regards. EW |
Old Sears Air Compressor - Help Please
"Gary R Coffman" wrote in message ... The reed valves are mounted in a plate under the head. Generally there'll be enough corrosion that you won't be able to remove and replace only one reed valve. You'll have to replace the plate and valves as an assembly. Gary Now, THIS I can handle. The parts you're writing about are very accessible. The trick will be to see if my local compressor store here in Abilene, TX can get the part(s) since this is an old compr. Your explanation of why it's likely not a check or loader valve is very important. Many Thanks. EW |
Old Sears Air Compressor - Help Please
EW wrote:
"Gary R Coffman" wrote in message ... The reed valves are mounted in a plate under the head. Generally there'll be enough corrosion that you won't be able to remove and replace only one reed valve. You'll have to replace the plate and valves as an assembly. Gary Now, THIS I can handle. The parts you're writing about are very accessible. The trick will be to see if my local compressor store here in Abilene, TX can get the part(s) since this is an old compr. Your explanation of why it's likely not a check or loader valve is very important. Many Thanks. EW yes, if this is indeed the problem, Gary should get an award...., rcm'r of the year? good luck! --Loren |
Old Sears Air Compressor - Help Please
On Fri, 15 Aug 2003 01:11:16 GMT, lcoe wrote:
yes, if this is indeed the problem, Gary should get an award...., rcm'r of the year? good luck! --Loren Actually, Don Young posted essentially the same answer, and according to the time stamps, he beat me to it. Gary |
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