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How to Identify the Age of a Marathon Motor

Understanding Date Codes

In order to determine the warranty status of Marathon motors , we have prefixed letters or a combination of a number and a letter as a date code to the model or serial number on each motor nameplate.

Marathon Motors Date Code

Circled above: DATE CODE - The month and year manufactured




The key to this code is the Date Code Chart, pictured above and explained in detail below.






Date coding with one number and one letter will cover motors from 1963 through 1971 and 1994 through 2002. Date coding with two letters covers motors from 1972 through 1993 and 2003 through 2024. Motors and generators 364 frame and larger sizes will have date code preceding serial number and smaller frame sizes, date code will precede model number.

The first letter or number of the prefix indicates the year, and last letter of the prefix indicates the month of manufacture.

When the prefix consists of only two letters or one number and one letter, no inherent overheating protection is incorporated in the motor. When inherent overheating protection is provided in the motor, an additional letter is inserted between the two date indicating letters or number and letter. This middle letter indicates the type of protector provided as listed below:



P Standard UL recognized Manual reset protector* (plus motor recognition)
Q Standard UL recognized Automatic reset protector* (plus motor recognition)
S Special-not UL recognized Automatic reset
U Special-not UL recognized Automatic reset* (with motor recognition)
V UL recognized Not thermally protected* (with motor recognition)
W Protector UL recognized for Locked Rotor Automatic reset protector* (plus motor recognition)
X/R Special-not UL recognized Manual reset
Z Special-not UL recognized Manual reset* (with motor recognition)

* Motor recognition covers 48, 56. 143T, 145T, 180T, and 210T frame motors only.

Date Code Examples

Motor without inherent overheating protection:

  • January, 1963 or 1994 Date Code - 1A (model number)
  • January, 1972 or 2003 Date Code - AA (model number)

Motor with Standard UL listed protection. manual reset:

  • January, 1963 or 1994 Date Code - 1PA (model number)
  • January, 1972 or 2003 Date Code - APA (model number)

Motor with Standard UL listed protection, automatic reset:

  • January, 1963 or 1994 Date Code - 1QA (model number)
  • January, 1972 or 2003 Date Code - AQA(model number)

Code Chart for Determining Date of Manufacture of Marathon Motors for Years 1963 through 1971

On all models without overload protectors there will be a numeral and a letter prefixed to the model or serial number. The numeral and the letter will designate the year and month in which the motors were built in accordance with the following table:


Year Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
1963 1A 1B 1C 1D 1E 1F 1H 1J 1K 1L 1M 1N
1964 2A 2B 2C 2D 2E 2F 2H 2J 2K 2L 2M 2N
1965 3A 3B 3C 3D 3E 3F 3H 3J 3K 3L 3M 3N
1966 4A 4B 4C 4D 4E 4F 4H 4J 4K 4L 4M 4N
1967 5A 5B 5C 5D 5E 5F 5H 5J 5K 5L 5M 5N
1968 6A 6B 6C 6D 6E 6F 6H 6J 6K 6L 6M 6N
1969 7A 7B 7C 7D 7E 7F 7H 7J 7K 7L 7M 7N
1970 8A 8B 8C 8D 8E 8F 8H 8J 8K 8L 8M 8N
1971 9A 9B 9C 9D 9E 9F 9H 9J 9K 9L 9M 9N


Typical Model Nomenclature

Fractional

161MOO- 300MOO

48S17D595 56S17D103

Integral

66TDR10 326UTDR26

143TTDR7020 326TTDR7027



Code Chart for Determining Date of Manufacture of Marathon Motors for Years 1972 through 1993

On all models without overload protectors there will be two letters prefixed to the model or serial number. The two letters will designate the year and the month in which the motors were built in accordance with the following table:


Year Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
1972 AA AB AC AD AE AF AH AJ AK AL AM AN
1973 BA BB BC BD BE BF BH BJ BK BL BM BN
1974 CA CB CC CD CE CF CH CJ CK CL CM CN
1975 DA DB DC DD DE DF DH DJ DK DL DM DN
1976 EA EB EC ED EE EF EH EJ EK EL EM EN
1977 FA FB FC FD FE FF FH FJ FK FL FM FN
1978 HA HB HC HD HE HF HH HJ HK HL HM HN
1979 JA JB JC JD JE JF JH JJ JK JL JM JN
1980 KA KB KC KD KE KF KH KJ KK KL KM KN
1981 LA LB LC LD LE LF LH LJ LK LL LM LN
1982 MA MB MC MD ME MF MH MJ MK ML MM MN
1983 NA NB NC ND NE NF NH NJ NK NL NM NN
1984 PA PB PC PD PE PF PH PJ PK PL PM PN
1985 RA RB RC RD RE RF RH RJ RK RL RM RN
1986 SA SB SC SD SE SF SH SJ SK SL SM SN
1987 TA TB TC TD TE TF TH TJ TK TL TM TN
1988 UA UB UC UD UE UF UH UJ UK UL UM UN
1989 VA VB VC VD VE VF VH VJ VK VL VM VN
1990 WA WB WC WD WE WF WH WJ WK WL WM WN
1991 XA XB XC XD XE XF XH XJ XK XL XM XN
1992 YA YB YC YD YE YF YH YJ YK YL YM YXN
1993 ZA ZB ZC ZD ZE ZF ZH ZJ ZK ZL ZM ZN


Typical Model Nomenclature

Fractional

48S17D595 56S17D103

Integral

140TTDR7026 445TTDR7026



Code Chart for Determining Date of Manufacture of Marathon Motors for Years 1994 through 2002

On all models without overload protectors there will be a numeral and a letter prefixed to the model or serial number. The numeral and the letter will designate the year and month in which the motors were built in accordance with the following table:


Year Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
1994 1A 1B 1C 1D 1E 1F 1H 1J 1K 1L 1M 1N
1995 2A 2B 2C 2D 2E 2F 2H 2J 2K 2L 2M 2N
1996 3A 3B 3C 3D 3E 3F 3H 3J 3K 3L 3M 3N
1997 4A 4B 4C 4D 4E 4F 4H 4J 4K 4L 4M 4N
1998 5A 5B 5C 5D 5E 5F 5H 5J 5K 5L 5M 5N
1999 6A 6B 6C 6D 6E 6F 6H 6J 6K 6L 6M 6N
2000 7A 7B 7C 7D 7E 7F 7H 7J 7K 7L 7M 7N
2001 8A 8B 8C 8D 8E 8F 8H 8J 8K 8L 8M 8N
2002 9A 9B 9C 9D 9E 9F 9H 9J 9K 9L 9M 9N


Code Chart for Determining Date of Manufacture of Marathon Motors for Years 2003 through 2024

On all models without overload protectors there will be two letters prefixed to the model or serial number. The two letters will designate the year and the month in which the motors were built in accordance with the following table:


Year Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
2003 AA AB AC AD AE AF AH AJ AK AL AM AN
2004 BA BB BC BD BE BF BH BJ BK BL BM BN
2005 CA CB CC CD CE CF CH CJ CK CL CM CN
2006 DA DB DC DD DE DF DH DJ DK DL DM DN
2007 EA EB EC ED EE EF EH EJ EK EL EM EN
2008 FA FB FC FD FE FF FH FJ FK FL FM FN
2009 HA HB HC HD HE HF HH HJ HK HL HM HN
2010 JA JB JC JD JE JF JH JJ JK JL JM JN
2011 KA KB KC KD KE KF KH KJ KK KL KM KN
2012 LA LB LC LD LE LF LH LJ LK LL LM LN
2013 MA MB MC MD ME MF MH MJ MK ML MM MN
2014 NA NB NC ND NE NF NH NJ NK NL NM NN
2015 PA PB PC PD PE PF PH PJ PK PL PM PN
2016 RA RB RC RD RE RF RH RJ RK RL RM RN
2017 SA SB SC SD SE SF SH SJ SK SL SM SN
2018 TA TB TC TD TE TF TH TJ TK TL TM TN
2019 UA UB UC UD UE UF UH UJ UK UL UM UN
2020 VA VB VC VD VE VF VH VJ VK VL VM VN
2021 WA WB WC WD WE WF WH WJ WK WL WM WN
2022 XA XB XC XD XE XF XH XJ XK XL XM XN
2023 YA YB YC YD YE YF YH YJ YK YL YM YN
2024 ZA ZB ZC ZD ZE ZF ZH ZJ ZK ZL ZM ZN

 

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