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Machine Shop and Tool Talk

Help Me Identify this Air Compressor


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  #1  
Old 04-23-2018, 09:25:26 AM
petenpole petenpole is offline
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Default Help Me Identify this Air Compressor

I have had this small 4 cylinder in-line compressor for over 10 years and it has been a loyal servant. It was quiet and would pump up a 10 gallon tank quick. It did have a little play in the crankshaft and on Friday the crank gave way.

Because it was so quiet I would love to find another crankshaft or pump just like it. I used it mostly to provide air to a grinding tool that I use for sharpening drill bits.

Any help what so ever is greatly appreciated.

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  #2  
Old 04-23-2018, 11:46:14 AM
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Default Re: Help Me Identify this Air Compressor

Campbell-Hausfeld
I have a few of those.
I could possibly be willing to let one go.....

Pictured below is NOT the one.
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Old 04-23-2018, 01:17:46 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Help Me Identify this Air Compressor

I have seen lots of 2 cyl C-H compressors, but never an inline 4, anyone know what years these were made?
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Old 04-23-2018, 01:52:29 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Help Me Identify this Air Compressor

Not sure of the year, but they were used as compressors for truck brake systems. Your crank failure is a common problem, especially if the oil level gets low. The crank is supported at the ends, and all four con rod throws are unsupported. I wanted to make an engine out of one I found at a local junk yard, but it too had a busted crank. A rod had let go, and the crank got a hold of the piston
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Old 04-23-2018, 08:51:51 PM
s100 s100 is offline
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Default Re: Help Me Identify this Air Compressor

Your broken compressor appears to be metallic light green. This is the color used by Sears in the 60's. I remember back then seeing 4 cylinder compressors very similar to those in the stores. I can't say if they were identical though. I think they were 3/4HP but I could be mistaken.

I can't imagine any truck maker relying on such a compressor for braking. Virtually every brake compressor I have ever seen has been water cooled and twin cylinder. They are stout compressors because truck brake systems pump up to 150psi with single stage compressors. I seriously doubt that little crankshaft is up to that task for intermittent duty never mind running constantly. Truck compressors also MUST have unloaders and I don't see any on those.
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Old 04-24-2018, 11:20:07 AM
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Default Re: Help Me Identify this Air Compressor

The units I have appear to be made for spray painting. The cast iron receiver was stuffed with steel wool apparently to act as a moisture trap and the receiver doesn't even have a bottom - it bolts down to the base with a gasket to seal it up. Pop-off was set at about 45 PSI.
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Old 04-24-2018, 02:53:56 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Help Me Identify this Air Compressor

Quote:
Originally Posted by s100 View Post
I can't imagine any truck maker relying on such a compressor for braking. Virtually every brake compressor I have ever seen has been water cooled and twin cylinder.
Years ago I picked up a pallet load of NOS little Saylor-Beall 2 cylinder air cooled compressors, just the compressor, no flywheel. I thought they were for little portable compressors, yet after much research found they were for truck brake air systems, and sold them all to truckers. So air cooled compressors were used by some mfr's on some models of trucks.
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Old 04-24-2018, 04:04:32 PM
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Default Re: Help Me Identify this Air Compressor

Sears Craftsman paint sprayer. See pix I just took.
60 PSI means just that! Shortly out of warranty, had pressure switch contacts stick. Relief was factory set around 75- 80 PSI, and crankshaft broke just where yours did second time it hit relief. Sears gave me new pressure switch contacts, crankshaft with rods attached, gaskets. I was to do work myself.

Original 3/4 HP motor had trouble starting compressor. Unloader is on bottom of pressure switch, and just unloads head and tube to pressure switch. Motor would turn a bit, and them be working against tank pressure. It would stay on start winding a long time, pulling huge amps, hence welded pressure switch contacts. I changed motor to 1 1/2 and oil to Mobil 1. No issues.

Have painted a few houses, run air tools on it. I spoke to a Sears engineer, who told me design was 65 PSI. over that, excessive torsion on crankshaft would cause failure.
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Old 04-24-2018, 04:25:00 PM
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Default Re: Help Me Identify this Air Compressor

IH, and Ford used air cooled air compressors on some of their setups. Never worked on one internally but replaced them complete. Neither of these were heavy duty line haul trucks but rather medium duty being farm trucks.
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Old 04-24-2018, 09:23:50 PM
K-Tron K-Tron is online now
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Default Re: Help Me Identify this Air Compressor

My GMC 7000 has a factory Midland KN7000 air cooled compressor. Bendix Westinghouse also made air cooled compressors up to the Tu-Flo 700 series. Air cooled compressors sure make setup a breeze, no extra coolant lines to worry about or fail. The air cooled compressors are easy enough to rebuild. I know Bendix had problems with their air cooled compressors overheating. I too thought this compressor might have been a Midland. It has a lot of similar characteristics. I was surprised to hear that it was built by Campbell Hausfeld. At 3.7cfm @ 40psi, you'd think it could run forever without failure. That is not much air at all, nor much pressure. It is a cute unusual compressor, one I hadnt seen before. If your looking for a quiet compressor, you might find an old Ritter Dental compressor to be equally as quiet. I have an old Quincy A-4 which isnt too bad with an intake silencer at 600rpm.

Chris
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