I bought a 74 your old compressor with a Quincy 325 – 14 pump. - Page 3
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  1. #41
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    Quote Originally Posted by dkmc View Post
    Synthetic oil prevents carbon build up on the valves and piston tops. But that's when the pump is being used such that its getting hot with continuous use at high pressures. Like media blasting in hot weather. Probably worth the extra money for 2-3 quarts anyway.
    I run synthetic oil in everything I own. I have done motor rebuilds where synthetic oil was used and where it was not.
    You can really see the difference on the motor parts and bearings…
    I will be sandblasting with this I have a sandblast pressure pot cabinet. A few days a month it runs nonstop for 12-16 hours.
    My synthetic oil was delivered today.

    My compressors I change the synthetic oil every six months on a schedule.

  2. #42
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    What oil did you get? Cost?

  3. #43
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    My Emax I use their whisper blue the extend the warrant if you subscribe to their maintained program. (lifetime if you do every six months.)
    This one I just ordered this one from Amazon it is 11 Qt. shipped.

    so.jpg

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  5. #44
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    I cut out this Quincy unloader wrench last night. It is 1/8” plate steel hopefully that is heavy enough. If not I with cut it out of ¼”
    Steel is so expensive right now so I just cut it out of some scrap I had.
    wr.jpg

    They show the wrench being use here.
    wr2.jpg

  6. #45
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    My motor mount came in. It fits the motor but the platform is not big enough. I will need to extend it to the pully side and back a little.
    I think I will cut some ¼” plate to put under it.

    20210303_183547.jpg

  7. #46
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    What speed does will it run with that motor pulley? Reason I ask is mine came with a setup that spun it at 950 [550v], when I set it up with my present motor, and since I hoard sheaves, I tried a couple of different sizes. Running it at 850 it was a lot quieter, and I can't see any reduction in performance, but your results may vary.

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    CFM and RPM are directly related, so the max CFM output is reduced at 850 compared to 950.
    I think Quincy's RPM and PSI limits are quite conservative. I have a little 210 single stage that max's out at 1000 RPM and 100 PSI as shown in their literature. It's been running 25+ years (for me) at 1150 RPM and 110 PSI with no sign of problems ever. I got it 30 some years ago at the scrap yard after it had been abused and dis-guarded in a former life. I never replaced any parts or gaskets on it. The cylinders still had the cross hatch hone marks in them when I got it.

    Quote Originally Posted by dundeeshopnut View Post
    What speed does will it run with that motor pulley? Reason I ask is mine came with a setup that spun it at 950 [550v], when I set it up with my present motor, and since I hoard sheaves, I tried a couple of different sizes. Running it at 850 it was a lot quieter, and I can't see any reduction in performance, but your results may vary.

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  10. #48
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    Quote Originally Posted by dundeeshopnut View Post
    What speed does will it run with that motor pulley? Reason I ask is mine came with a setup that spun it at 950 [550v], when I set it up with my present motor, and since I hoard sheaves, I tried a couple of different sizes. Running it at 850 it was a lot quieter, and I can't see any reduction in performance, but your results may vary.
    My large pulley is 16” my small is 8” 5/16” motor is 1740 RPM that puts the pump right at 904 RPM.
    I bought the single-phase motor with the same size shaft so I could use the original motor pully.

    Here is a good pully calculator.
    Pulley Calculator. RPM, Belt Length, Speed, Animated Diagrams
    Last edited by mark_b; 03-04-2021 at 11:13 PM.

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  12. #49
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    Nice work on the wrench by the way, especially for cutting it out freehand. FYI a Wescott works pretty well to loosen the unloader towers too.

  13. #50
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    Quote Originally Posted by dundeeshopnut View Post
    Nice work on the wrench by the way, especially for cutting it out freehand. FYI a Wescott works pretty well to loosen the unloader towers too.
    I drew it up in CAD and cut it with CNC plasma. I have a CNC plasma table with a Hypertherm Powermax 85. So totally cheating.

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    LOL. C'mon man, this is the antique section. You could have at least said you cut it out with a coping saw and files.

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  17. #52
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    It is alive. This is just a test but it pumped 80 gallons 150psi in 5:02. Not bad.
    It is leaking out the unloader towers. But I know I would have to clean the valves.


    Last edited by mark_b; 03-14-2021 at 06:46 PM.

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    When the compressor shuts down all the air leaks out both unloader towers.
    Is the is diaphragms needing replaced or the valves leaking this air?

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    Diaphragms most likely. A leaking high pressure valve [there is only one] generally can be heard leaking air into the crankcase.

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  22. #55
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    I ordered parts to rebuild the head.

    Ball Valve 3/4" NPT Female Inlet and Outlet
    Head Overhaul Kit to Rebuild Quincy air Compressor Model 325

    I still need to get a belts I should be getting close to having everything I need.
    The compressor was putting out more air than it was in the spec sheet. This is the first time I have ever seen that.
    Now days they overestimate the CFM not under estimate it.

    I was so surprised I did 3 full tank pump up test. It was over is spec on all three test.
    Is this normal for the 325?

  23. #56
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    Where is the ball valve going? The cfm rating is pumping against 175 psi. So yeah, the compressor is going to put out a bit more air when the tank pressure is low.

  24. #57
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    The ball valve will be on the tank outlet. My CFM test was from 0 psi to 150 psi.

  25. #58
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    The cfm is rated at 175 psi she will happily keep pumping to 250 or so with no extra parts needed if you want her to, providing you have enough horses pulling the belt.

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    Being able to pump to 250 psi is amazing even if I do not need it.

    I do not have my magnetic starter wired up yet. I just was testing with just the pressure switch.
    I have not adjusted the pressure switch yet to 175 psi but I will. I need that pressure for sand blasting.

    I have a 5HP this is the motor I have Error | DNS Resolution | Northern Tool + Equipment
    I bought it off eBay for best offer it was new.
    I offered $375 and they took it.
    Leeson 131537.00 Electric Motor 5 HP 1725 rpm 1PH 230 VAC Single 184T Frame.

  28. #60
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    It looks like my compressor parts will be here Friday.

    I had to file a lost package report with the post office for my bearing seal.
    The bearing was shipped more than a month ago.
    The post office found it and I should have it tomorrow.
    I will still need to get belts for it.

    Maybe I can match them up at a auto parts store?

    I now have wiring instruction for my magnetic starter. I called the company that sold it to me. You would think they would just put instructions in the box.


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