Air compressor: rebuild or replace pump? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pwdcougar · 02-23-2017, 10:00 PM

Dredging up an old post. I'm finally getting around to installing the Schulz MSL 10 Max pump I got in the fall. The online pulley calculator I found says that my 3450rpm motor with a 4.25" pulley will spin the 10" pulley on the Schulz pump 1466rpm. The Schulz website says my pump should spin at 860rpm. Will the 606rpm increase be too much for it?

If I can install the old pumps 14" pulley it brings the rpm down to 187 over the recommended pump speed.

On the other hand if I find a 2.5" motor pulley it puts me almost spot on Schulz's 860rpm

Am I missing anything here?

Thanks

Paul

Schulz site: http://www.schulzamerica.com/product...e/max-140-psi/

Calculator site: http://www.blocklayer.com/pulley-belteng.aspx

Dead Parrot · 02-24-2017, 06:22 PM

Spinning the pump too fast will increase the heat generated in the head and create additional load on the motor. Not an expert but would be best if you can swap the 14" pulley to the new pump AND buy a new motor pulley of the correct size to get the recommended RPM. Too small a motor pulley might not leave enough contact area to drive the belt.

pwdcougar · 02-24-2017, 08:31 PM

Quote:

Originally Posted by Dead Parrot

Spinning the pump too fast will increase the heat generated in the head and create additional load on the motor. Not an expert but would be best if you can swap the 14" pulley to the new pump AND buy a new motor pulley of the correct size to get the recommended RPM. Too small a motor pulley might not leave enough contact area to drive the belt.

Thanks Parrot. I found this information on one of the Ebay sellers pages. It says to spin it between 700 and 1000.

Paul

68c10airstream · 02-24-2017, 11:24 PM

Typical motor rpm's are usually around 3600 or 1800. Dead parrot is spot on about spinning at 1,000 rpm's or less.

pwdcougar · 02-25-2017, 01:29 AM

Thanks guys. My motor data plate says it spins at 3450rpm. My old pump pulley and the new pump have different shaft sizes so that swap is out. Using a 2.5"pulley on my motor will spin the new pump at 902rpm.

Paul

**richard2717** · 02-25-2017, 11:41 AM

Paul
Mc Master Carr is up your way and may have the pulley(s) you need.

https://www.mcmaster.com/#pulleys/=16ibzs2

Richard

pwdcougar · 02-26-2017, 04:58 PM

Quote:

Originally Posted by richard2717

Paul
Mc Master Carr is up your way and may have the pulley(s) you need.

https://www.mcmaster.com/#pulleys/=16ibzs2

Richard

That's a great website Richard! Very well laid out. Found the pulley that would work in secods. Unfortunatley I spent an hour on ebay and ordered one about an hour earlier than I saw your reply!

Paul

02-23-2017, 10:00 PM	#26
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,307	Re: Air compressor: rebuild or replace pump? Dredging up an old post. I'm finally getting around to installing the Schulz MSL 10 Max pump I got in the fall. The online pulley calculator I found says that my 3450rpm motor with a 4.25" pulley will spin the 10" pulley on the Schulz pump 1466rpm. The Schulz website says my pump should spin at 860rpm. Will the 606rpm increase be too much for it? If I can install the old pumps 14" pulley it brings the rpm down to 187 over the recommended pump speed. On the other hand if I find a 2.5" motor pulley it puts me almost spot on Schulz's 860rpm Am I missing anything here? Thanks Paul Schulz site: http://www.schulzamerica.com/product...e/max-140-psi/ Calculator site: http://www.blocklayer.com/pulley-belteng.aspx __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

02-24-2017, 06:22 PM	#27
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,620	Re: Air compressor: rebuild or replace pump? Spinning the pump too fast will increase the heat generated in the head and create additional load on the motor. Not an expert but would be best if you can swap the 14" pulley to the new pump AND buy a new motor pulley of the correct size to get the recommended RPM. Too small a motor pulley might not leave enough contact area to drive the belt.

02-24-2017, 11:24 PM	#29
68c10airstream Registered User Join Date: Mar 2013 Location: Marquette michigan Posts: 828	Re: Air compressor: rebuild or replace pump? Typical motor rpm's are usually around 3600 or 1800. Dead parrot is spot on about spinning at 1,000 rpm's or less.

02-25-2017, 01:29 AM	#30
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,307	Re: Air compressor: rebuild or replace pump? Thanks guys. My motor data plate says it spins at 3450rpm. My old pump pulley and the new pump have different shaft sizes so that swap is out. Using a 2.5"pulley on my motor will spin the new pump at 902rpm. Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

02-25-2017, 11:41 AM	#31
richard2717 Equal opportunity joke ofender Join Date: Oct 2011 Location: Eastern Shore of MD Posts: 10,136	Re: Air compressor: rebuild or replace pump? Paul Mc Master Carr is up your way and may have the pulley(s) you need. https://www.mcmaster.com/#pulleys/=16ibzs2 Richard __________________ Members I have met. Dually Jams, OlBlue60, ScottH, Tommyboy24, Dujobo, Warbucket, 2003 Silverado, Notsolo, my90k5, 6t727t2, Special-K ,Jack_71C10, tabarcus,72blazer_mud_bogger,pwdcougar,RSavage,EricSean,1Rippen6,invicta455,tennaragtop71,arks, Kendal,Bennett68C10, Perpendicular, Chainsawman, McGeesCustomMinis,ShortbedClayton,longblue72,6768chevylover,Tim71,Travisarmenta,Ol' Drippy,fleetmitch,georgieb51,Dave,bcnya2,Dadsburb https://paypal.me/6772GMtruckparts Most women like the strong, silent type… Fortunately for me, my wife prefers the out-of-shape, mouthy type.



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