Quincy 325 Flywheel Torque spec.?

[SBOhio]

Just finished painting my Quincy 325 air compressor. Can anyone help with an idea of how much to torque the 2 bolts holding cast iron fly wheel. I am always leery about tightening to much on cast and cracking the it. Or leaving to loose and having it get damaged. I found the parts manual online but haven't found a service manual.

 

[daparrothead]

What size, thread pitch & material are the bolt's ?

 

[EOC_Jason]

Try emailing Quincy or a local service rep. They can probably email you a PDF with torque specs for all the bolts.

 

[SBOhio]

The shaft is 1 1/2" diameter. This is actually called a pulley, not the flywheel that I called it earlier. The 2 bolts are 7/16" Grade 5, Fine Thread. I'm sure they're plenty strong, but its that gap in the casting next to the shaft that worries me a little. Just trying to get close now. I will email Quincy tomorrow when they're open. First attempt at posting a pic.. I hope it comes thru.

 

[Fixnair]

Worked on them all my life. They are flywheels by the way. I never torqued them, I just got them as tight as I could with a 1/2" long handle ratchet. If I was to guess the torque would be around 120 ft lbs.

 

[SBOhio]

Worked on them all my life. They are flywheels by the way. I never torqued them, I just got them as tight as I could with a 1/2" long handle ratchet. If I was to guess the torque would be around 120 ft lbs.

Would you put anything on the shaft? Also this was used out of a small factory when I bought it 20 years ago. Can you tell me what look for as far as performance to judge the condition. We have tested it and it seems quiet compared to the other one we have running in our main shop. These are great compressors and I would rebuild it if needed.

 

[zkling]

The manual for my old 230, which is basically the single stage version of the 325 states 90 ft lbs per bolt, dry threads.

Worked on them all my life. They are flywheels by the way. I never torqued them, I just got them as tight as I could with a 1/2" long handle ratchet. If I was to guess the torque would be around 120 ft lbs.

I'm going to have to respectfully disagree. While their inertia does play a part in operation like a fly wheel is deigned for, their primary purpose is to transmit power from the motor via a belt drive. The additional mass and thus flywheel effect is a secondary feature to smooth out operation, but not necessary to keep the pump in motion as would be the case with a true flywheel. Quincy refers to it as a pulley sheave.

 

[Trey T]

OP: You got any photo of the build?

 

[SBOhio]

The manual for my old 230, which is basically the single stage version of the 325 states 90 ft lbs per bolt, dry threads.



I'm going to have to respectfully disagree. While their inertia does play a part in operation like a fly wheel is deigned for, their primary purpose is to transmit power from the motor via a belt drive. The additional mass and thus flywheel effect is a secondary feature to smooth out operation, but not necessary to keep the pump in motion as would be the case with a true flywheel. Quincy refers to it as a pulley sheave.

I found a chart at that I will have to try and retrieve tonight. It covers most of the major Quincy torque specs. for most models. If I'm reading it right it says the pulley for a 325 should be 75 lbs. Just have to figure out how to get it on here.

 

[SBOhio]

The manual for my old 230, which is basically the single stage version of the 325 states 90 ft lbs per bolt, dry threads.



I'm going to have to respectfully disagree. While their inertia does play a part in operation like a fly wheel is deigned for, their primary purpose is to transmit power from the motor via a belt drive. The additional mass and thus flywheel effect is a secondary feature to smooth out operation, but not necessary to keep the pump in motion as would be the case with a true flywheel. Quincy refers to it as a pulley sheave.

OP: You got any photo of the build?

I haven't done alot to this yet other than replace the burnt out 5 hp with a 7.5 Hp Baldor I had here on the farm. New pressure switch and a couple part in the unloader valve. New coat of rustoleum safety red. I would like to find out what to watch for as far as oil pressure and performance to have an idea what kind of shape it's in when I fire it up.

 

[zkling]

I found a chart at that I will have to try and retrieve tonight. It covers most of the major Quincy torque specs. for most models. If I'm reading it right it says the pulley for a 325 should be 75 lbs. Just have to figure out how to get it on here.

What is the ROC on your pump? I've found a few manuals for the 325 and they all state 90 ft lbs on the main pulley bolts.

 

[SBOhio]

What is the ROC on your pump? I've found a few manuals for the 325 and they all state 90 ft lbs on the main pulley bolts.[/QUOTE

:rocker My ROC is 13. I think that puts it at about 1976 if remember. Would you put anything on the shaft? IE: Neversieze, light oil, Grease, etc.

 

[SBOhio]

What is the ROC on your pump? I've found a few manuals for the 325 and they all state 90 ft lbs on the main pulley bolts.

Found the chart. I believe it was posted by someone called 930dreamer on another thread. I sent him a pm but on it but haven't got a response. Anyway he gets the credit for putting it out there. I'm sure others can use the info..

 

[zkling]

What is the ROC on your pump? I've found a few manuals for the 325 and they all state 90 ft lbs on the main pulley bolts.

:rocker My ROC is 13. I think that puts it at about 1976 if remember. Would you put anything on the shaft? IE: Neversieze, light oil, Grease, etc.

No, that defeats the friction fit. Just make sure both surfaces are clean and burr free.

I'll leave what torque spec you want to use up to you. I've found 3 manuals for the 325 online, latest of which being 2006 and they all report 90ft lbs. They may have made a change in the spec over the years. My 230 was from the 80's and the applicable manual for that stated 90 ft lbs.

 

[SBOhio]

This gets me in the ballpark. I'll keep an eye on it after running.

 

[zkling]

This gets me in the ballpark. I'll keep an eye on it after running.

Yea, I guess if the pulley goes dancing across the shop floor at speed you will know those 15 extra ft lbs were the critical number.

I really wouldn't worry about it that much. I'd think even amounts would be more important than the specific number.

 

[Fixnair]

Well zkling, many other manufacturers refer to it as a flywheel. And yes it does have a flywheel effect. Try to replace it with just a pulley. It will dance all over the floor. It is really both a pulley and a flywheel. Neither term is wrong.

SBOhio, do use some neversieze, the next time you have to remove it you will be glad you did.

 

[kams1973]

Well zkling, many other manufacturers refer to it as a flywheel. And yes it does have a flywheel effect. Try to replace it with just a pulley. It will dance all over the floor. It is really both a pulley and a flywheel. Neither term is wrong.

SBOhio, do use some neversieze, the next time you have to remove it you will be glad you did.

Words of wisdom.

 

[Trey T]

20psi. I run my Quincy 210 at 20psi.

... I would like to find out what to watch for as far as oil pressure and performance to have an idea what kind of shape it's in when I fire it up.