Quincy QR 25-325 Missing ROC Documents.

[The Tool Tyrant]

While I was doing a little detective for info on a QR 325 with a blank serial # plate, I searched the Quincy parts manual library looking for a ROC that matched the part # on the crankcase, with no luck. I noticed a big void in sequential ROC numbers, so I contacted Quincy. Here is their reply...

"325 ROC's went

15-16-17-18-100-101-102- etc

during Colt ownership, documentation did not seem a priority."


It appears stamping serial / ROC numbers on the info plate was also not a priority!

 

[yatg]

I have docs for ROCs 9, 11, 13&14.
All of those say crankcase 5503.

 

[csp]

You may find the ROC stamped into the end of the crankcase where the belt pulley is attached.

 

[oldmachinenut]

My 325 roc 15 has a 15 stamped on the pulley end of the crankshaft. I found it when i was cleaning it up during overhaul.

 

[The Tool Tyrant]

You may find the ROC stamped into the end of the crankcase where the belt pulley is attached.

True. A little more background on said 325...a fellow GJ member found a CL ad for a Quincy pump with not much other info than photos. The info tag was blank (no ser.#, ROC, model) One photo showed the part# on the crankcase as 5503-001 so I knew that the pump was a 325, but searching all the available parts manuals, I could find only 5503 or later ROC's with 5503-003. The info tag showed 'COLT INDUSTRIES' which changed their name to COLTEC in 1990, so it had to be pre-1990.
He can check ROC on the crank when he see it in person.

 

[yatg]

Found a reference to 5503-001 as the crankcase for SLT 7.5 pumps
Document id 50121-100, feb 1986.
According to some notes:
"The QE series has a "SLT 7.5" pump. This is for both the 5hp and 7hp motors. "
I can check for the number on my crankcase this weekend since I have a QE-5.

 

[The Tool Tyrant]

Found a reference to 5503-001 as the crankcase for SLT 7.5 pumps
Document id 50121-100, feb 1986.
According to some notes:
"The QE series has a "SLT 7.5" pump. This is for both the 5hp and 7hp motors. "
I can check for the number on my crankcase this weekend since I have a QE-5.

That is very interesting. Scroll down to post # 991 here...
https://www.garagejournal.com/forum/showthread.php?p=8839735#post8839735

This is by all accounts a QR series pump. I have to assume that Quincy used the same case for both pumps.
I assume that the QE was the predecessor to the 'Air Master' and QT pumps.

 

[yatg]

Also in my notes

The QE -> QT line "evolution/upgrade" was done for cost reasons and that the QE/SLT compressors are "Pretty much bullet-proof".
The bottom end of the pump is the same as the QR without the pressure lube bits.

I remember looking at my QE5 to see what it would take to convert to pressure lube. At the time, I didn't think the crankcase had all the necessary holes. Maybe they did a run of 5503-001 castings for the QE compressors, but were able to machine them for the QRs?

 

[larry4406]

“ROC”= Republic of China?

 

[yatg]

ROC = record of change,
basically the version number of the pump within the series.

 

[yatg]

First two pictures are of the SLT pump front and right side.
Second two pictures are of the 325 pump front and right side.

The 325 has a big hex head plug on the front, and oil fittings on the side.

The SLT block, 5503-001, looks the same overall, except for the machining for the oil fittings.

 

[jmarkwolf]

“ROC”= Republic of China?

Thanks Larry. I was struggling with that one also.

It's maddening when some think that everyone knows every damn acronym in the world, and are too lazy to type a few more characters, for the rest of us that dont.