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Tool Talk Discussion Forum

Does anyone have a webster air compressor?


05-02-2004 10:30:42

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Just wanted to know if anyone uses a Webster and if so What size??

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11-10-2006 12:30:27

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 Re: Does anyone have a webster air compressor? in reply to riesman20, 05-02-2004 10:30:42  
Hello everyone, glad I found this web site. I purchased a Webster M#721 1 S#30072J5 a few years ago with a shot 3ph motor. Installed a new 7.5 hp single phase motor, set the rotation so the pumps wheel blows air over the heads. The compressor seems slow to build up pressure and it kicked out the oil plug I made. Didn't come with one above the oil level glass. There was a noticeable knocking noise while running, though it didnít appear too bad.

I would love to get a hold of a manual or at least a copy. All the talk of reeds and stuff makes no sense to me. Must be compressor specific. I believe that the rings are shot with all the blow by. But I donít want to start taking it apart without some idea of what I should be looking for and what I should replace while itís open.

I look forward to all your replies and help.

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05-03-2004 14:30:15

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 Re: Does anyone have a webster air compressor? in reply to riesman20, 05-02-2004 10:30:42  
Model 21:

1/2 hp, 680 RPM @ 60 psi 3.38 cfm.

3/4 hp, 860 RPM @ 100 psi. 4.3 cfm

Straight from the Webster manual.

I didn't reply earlier because I didn't have the info, due to the fact that I am working at the shop quite intermittently while attending school. Also, it would be kinda dumb to respond to some one's question by saying "I don't know", which really isn't very helpful.

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05-03-2004 19:58:42

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 Re: Re: Does anyone have a webster air compressor? in reply to Roger, 05-03-2004 14:30:15  
Roger what will happen if I put on a 3/4 hp that is 1750 rpm? Also my serial no says 21-17353 but the plate says model 24 than a space than 2. Any idea what that is? thanks.

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05-04-2004 11:15:58

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 Re: Re: Re: Does anyone have a webster air compres in reply to riesman20, 05-03-2004 19:58:42  
860 is the pump speed. You will have to select the proper pulley size to get this rpm at the pump.

Multiply the O.D. of the compressor flywheel by 860, then divide this number by 1750, this is the pulley size in inches for the motor.

Model 24 might be the unit model number( the whole compressor unit, tank motor etc.). The Webster manual I have access to shows models 11,21,35,45,50,55,60,65,72,75,80 and 81. The 45 is two model 21 cylinders on a common crankcase.

The other numbers might be record of change numbers, like the ones Quincy uses to keep track of when changes in designs take place through the years.

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05-04-2004 18:15:27

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 Re: Re: Re: Re: Does anyone have a webster air com in reply to Roger, 05-04-2004 11:15:58  
Roger do I have to have gaskets when re-assembling the pump? there was a seal between the bearing and the pulley and at the top of the cylinder but do I need gaskets everywhere else? If so can I use gasket maker. Thanks Again!

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05-04-2004 21:18:09

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 Re: Re: Re: Re: Re: Does anyone have a webster air in reply to riesman20, 05-04-2004 18:15:27  
I guess you could use gasket maker, but these are pretty simple gaskets you could either tap out, or trace out on thin gasket paper and cut them with scissors and hole punches. There is very little pressure inside the crankcase, unless the rings are bad. You can still get parts for these pumps, by the way. I am not sure, but I think the crank in these pumps are held in place on one end by two opposing Timken bearings press-fit against each other. It is easy to overdo this press-fit, so be careful if you are changing bearings. I know Webster made a neat little V-twin compressor from the cylinders off of a 21 which used this bearing arrangement. The front bearing also had the oil seal on its outside edge, which then ran inside a bore cut into the crankcase. A bit weird, but then, Webster did have a few strange ideas.

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05-05-2004 08:06:32

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 Re: Re: Re: Re: Re: Re: Does anyone have a webster in reply to Roger, 05-04-2004 21:18:09  
Roger do I need to grease the bearings? or just let the crankcase oil lube it? I replaced the bearings and left a tiny amount of play between the bearings, is that correct?

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05-05-2004 14:24:13

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 Re: Re: Re: Re: Re: Re: Re: Does anyone have a web in reply to riesman20, 05-05-2004 08:06:32  
Oil will lubricate the bearings. There should be little end play, or else they will knock. Once you run it, you will hear if they are too slack. Does it have the dual-opposed Timken setup?

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Ted Crosfield

05-20-2004 19:11:25

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 Re: Re: Re: Re: Re: Re: Re: Re: Does anyone have a in reply to Roger, 05-05-2004 14:24:13  
I have acquired a motorless, tank mounted, Webster Air Compressor Model H. I would appreciate any info re motor size etc. and a source for manuals. Thanks

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05-05-2004 14:42:24

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 Re: Re: Re: Re: Re: Re: Re: Re: Does anyone have a in reply to Roger, 05-05-2004 14:24:13  
Yes, it has the dual oppossed timken setup. I have totally rebuilt the compressor. I will be running it by the weekend and the only other thing I am questioning is what size motor I should have any comments? does your book show cfm at lower psi's as well?

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05-05-2004 18:33:13

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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Does anyone ha in reply to riesman20, 05-05-2004 14:42:24  
No specs for lower pressures. I'd go with a 1hp motor I guess, just so it isn't working too hard. Might get a bit more psi out of it too, maybe 110 or 120 depending on amp draw.

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05-06-2004 09:02:16

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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Does anyon in reply to Roger, 05-05-2004 18:33:13  
One last question roger. Do I need a blow off to allow the pressure out of the head after it meets its pressure? Or does the back of the head above the cylinder do that? Thanks.

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05-06-2004 18:44:46

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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Does a in reply to riesman20, 05-06-2004 09:02:16  
This compressor uses reed valves, which will probably allow it to unload itself through leakage after it shuts off. It is best not to rely on this however. There should be a little unloader air line going from a port on the check valve of the tank to a needle valve on the side of the pressure switch. This valve will allow the compressor to unload itself after shutting off. Alternately, you might have a self bleeding check valve, which has a very tiny orifice on its side which bleeds off air from the check valve back to the head, after the compressor shuts down.

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poor tom

05-03-2004 05:00:36

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 Re: Does anyone have a webster air compressor? in reply to riesman20, 05-02-2004 10:30:42  
Yes, I have a Webster. Serial no. 501294. See the post back in Jan. 12,04. It will use a 2 or 2 1/2 hp. motor at 650 rpm. when I find time to work on it. Should give me about 8 cfm. at 100 psi. I plan to use it as a backup to my 5 hp. and will share the 80 gal. tank. Want to use it on small stuff when the big one is too much- you know, nailers, touchups, airbrushing, tires. It would not be enough to spray my furniture though. I'm a cabinetmaker.

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