Allis Chalmers

Model 6A

1931 ........................1
1932 ......................135
1933 ......................401
1934 ......................802

Model 12-20

1921 ........................1
1922 ......................333

Model 15-25

1921 ........................1
1922 ......................144
1923 ......................380
1924 ......................803
1925 .....................1046
1926 .....................1326
1927 .....................1571
1928 .....................1705

Model 18-30

1919 ........................1
1920 ......................115
1921 ......................351
1922 ......................755
1923 .....................1158
1924 .....................2151
1925 .....................2651
1926 .....................3261
1927 .....................6521
1928 .....................8901
1929 ....................14501

Model 20-35

1929 ........................1
1930 .....................1075

Model 170

1968 .....................2721
1969 .....................5374
1970 .....................6369
1971 .....................6988
1972 .....................7797
1973 .....................8821

SN Location: at the front of torque housing flange on either side.

Model 175

1970 .....................1001
1971 .....................1477
1972 .....................1624
1973 .....................1740
1974 .....................2153
1975 .....................3255

SN Location: at the front of torque housing flange on either side.

Model 180

1968 .....................2682
1969 .....................6094
1970 .....................9235
1971 ....................10561
1972 ....................11729
1973 ....................12447

SN Location: at the front of torque housing flange on either side.

Model 185

1970 .....................1001
1971 .....................1952
1972 .....................2935
1973 .....................3763
1974 .....................4961
1975 .....................6542

SN Location: at the front of torque housing flange on either side.

Model 190 and 190XT

1964 .....................1001
1965 .....................2485
1966 .....................8219
1967 ....................13273
1968 ....................19262
1969 ....................23234
1970 ....................25901
1971 ....................29136
1972 ....................31057
1973 ....................31118

Model 200

1972 .....................1001
1973 .....................3344
1974 .....................6294
1975 .....................9250

Model 210

1970 .....................1001
1971 .....................1107
1972 .....................2082
1973 .....................2469

SN Location: at front of torque housing flange on either side.

Model 220

1970 .....................1938
1971 .....................2451
1972 .....................2626
1973 .....................2860

SN Location: at front of torque housing flange on either side.

Model 7000

1975 .....................1001

SN Location: on firght hand side of differential housing.

Model 7030

1973 .....................1001
1974 .....................2596

SN Location: above the PTO guard.

Model 7040

1975 .....................1303

SN Location: above the PTO guard.

Model 7050

1973 .....................1001
1974 .....................1688

SN Location: above the PTO guard.

Model 7060

1975 .....................1299

SN Location: above the PTO guard.

Model 7080

1975 .....................1007

SN Location: above the PTO guard.

Model A

1939 ....................26614
1940 ....................26782
1941 ....................26896
1942 ....................26915

Model A Std.

1936 ........................1
1937 ......................171
1938 ......................342
1939 ......................516
1940 ......................685
1941 ......................856
1942 .....................1026
1943 .....................1200

Model B

1937 ........................1
1938 ......................101
1939 ....................11800
1940 ....................33394
1941 ....................49721
1942 ....................56782
1943 .....................6451
1944 ....................65502
1945 ....................70210
1946 ....................72301
1947 ....................73370
1948 ....................80056
1949 ....................92295
1950 ...................102393
1951 ...................114258
1952 ...................118674
1953 ...................122310
1954 ...................124202
1955 ...................124711
1956 ...................126497
1957 ...................127186

SN Location: on top of transmission case, to the rear of the shift lever.

Model IB

1946 .....................1001
1947 .....................1003
1948 .....................1010
1949 .....................1282
1950 .....................1556
1951 .....................1879
1952 .....................2219
1953 .....................2570
1954 .....................3068
1955 .....................3303
1956 .....................3403
1957 .....................3478
1958 .....................3588

SN Location: on top of transmission case, to the rear of the shift lever. If your number is much higher, use B SN reference to date your tractor.

Model C

1940 ........................1
1941 ......................112
1942 ....................12389
1943 ....................18782
1944 ....................23908
1945 ....................30695
1946 ....................36378
1947 ....................39168
1948 ....................51515
1949 ....................68281

SN Location: on top of transmission case, to the rear of the shift lever.

Model CA

1950 .......................14
1951 ......................305
1952 ....................10395
1953 ....................22181
1954 ....................31424
1955 ....................32907
1956 ....................37203
1957 ....................38618

SN Location: on top of transmission case, to the rear of the shift lever.

Model DO-ALL

1931 ........................1
1932 .....................3192

Model G

1948 ........................6
1949 ....................10961
1950 ....................23180
1951 ....................24006
1952 ....................25269
1953 ....................26497
1954 ....................28036
1955 ....................29036

SN Location: on top of transmission case, to the rear of the shift lever.

Model L

1929 ........................1
1930 .....................2155

Model M

1930 ........................1
1931 ......................N/A
1932 ......................N/A

Model RC

1939 ........................4
1940 .....................4392
1941 .....................5417

Model U

1929 ........................1
1930 .....................1751
1931 .....................3676
1932 .....................5525
1933 .....................7405
1934 .....................8896
1935 ....................10596
1936 ....................12086
1937 ....................13576
1938 ....................14855
1939 ....................15587
1940 ....................16078
1941 ....................16722
1942 ....................17137
1943 ....................17470
1944 ....................17801

SN Location: on top of transmission case, to the rear of the shift lever.

Model UC

1930 ........................1
1931 ......................336
1932 ......................826
1933 .....................1268
1938 .....................3757
1939 .....................4547
1940 .....................4770
1941 .....................4972

Model WC

1933 ........................1
1934 .......................29
1935 .....................3127
1936 ....................13870
1937 ....................31784
1938 ....................60790
1939 ....................75216
1940 ....................91534
1941 ...................103517
1942 ...................114534
1943 ...................123171
1944 ...................127642
1945 ...................134624
1946 ...................148091
1947 ...................152845
1948 ...................170174

SN Location: on rear of differential housing just above operator platform.

Model WC Maintainer

1938 ......................C-1
1939 ..................1-C-151
1940 ..................1-C-401
1941 ..................1-C-408

Model W Patrol

1940 ....................1-E-1
1941 ..................1-E-467
1942 ..................1-E-635
1945 ..................1-E-681
1946 ..................1-E-820
1947 .................1-E-1438
1948 .................1-E-2279
1949 .................1-E-3516
1950 .................1-E-3747

Model WD

1948 ........................7
1949 .....................9280
1950 ....................35471
1951 ....................72356
1952 ...................105216
1953 ...................131273

SN Location: on top of left differential brake housing.

Model WD45

1953 ...................146607
1954 ...................160386
1955 ...................190993
1956 ...................217992
1957 ...................230295

Model WF

1937 ........................4
1938 ......................289
1939 .....................1336
1940 .....................1892
1941 .....................2300
1942 .....................2704
1943 .....................NONE
1944 .....................3004
1945 .....................3195
1946 .....................3510
1947 .....................3748
1948 .....................4111
1949 .....................5500
1950 .....................7318
1951 .....................8316

SN Location: on rear of differential housing just above operator platform.

Model D10

1959 .....................1001
1960 .....................1950
1961 .....................2801
1962 .....................4511
1963 .....................6801
1964 .....................7675
1965 .....................9204
1966 .....................9486
1967 .....................9795

SN Location: at front of torque housing on left side.

Model D12

1959 .....................1001
1960 .....................1950
1961 .....................2801
1962 .....................3638
1963 .....................5501
1964 .....................6012
1965 .....................9192
1966 .....................9508
1967 .....................9830

SN Location: at front of torque housing on left side.

Model D14

1957 .....................1003
1958 .....................9400
1959 ....................14900
1960 ....................21800

SN Location: at front of torque housing on left side.

Model D15

1960 .....................1001
1961 .....................1900
1962 .....................6470
1963 ....................13001
1964 ....................16928
1965 ....................19681
1966 ....................23753
1967 ....................23734

SN Location: at front of torque housing on left side.

Model D17

1957 .....................1001
1958 .....................4300
1959 ....................16500
1960 ....................28200
1961 ....................33100
1962 ....................38070
1963 ....................65001
1964 ....................70611
1965 ....................77090
1966 ....................80533
1967 ....................86061

SN Location: at front of torque housing on left side.

Model D19

1961 .....................1001
1962 .....................1250
1963 ....................12001

SN Location: at front of torque housing on left side.

Model D21

1963 .....................1001
1964 .....................1417
1965 .....................2079
1966 .....................2408
1967 .....................2863
1968 .....................3777
1969 .....................4498

SN Location: at front of torque housing on left side.

Model F - 10-Ton Crawler

1926 ....................10001
1927 ....................10082
1928 ....................10241

Model F - 75 Crawler

1928 ....................70001
1929 ....................70208
1930 ....................70655
1931 ....................70985

Model G - 5-Ton Crawler

1926 .....................7001
1927 .....................7091

Model H - 6-Ton Crawler

1927 ....................60001
1928 ....................60207

Model H - 50 Crawler

1928 ....................60298
1929 ....................60611
1930 ....................61559
1931 ....................62147

Model K - 35 Crawler

1929 ........................1
1930 .......................49
1931 .....................1373
1932 .....................2334
1933 .....................2654
1934 .....................3046
1935 .....................3594
1935 ..................KO-6001
1936 .....................4793
1937 .....................6336
1938 .....................7708
1939 .....................8018
1940 .....................8523
1941 .....................8957
1942 .....................9269
1943 .....................9294

Model L and L-O Crawler

1931 ........................1
1932 .......................35
1933 ......................499
1934 ......................661
1935 ..................LO-4001
1935 ......................888
1936 .....................1439
1937 .....................2137
1938 .....................2706
1939 .....................2944
1940 .....................3233
1941 .....................3252
1942 .....................3273

Model M Crawler

1932 ........................1
1933 .......................42
1934 ......................402
1935 ......................842
1936 .....................1942
1937 .....................3842
1938 .....................7067
1939 .....................8127
1940 .....................9540
1941 ....................11380
1942 ....................12947

Model S and S-O Crawler

1937 ........................3
1938 ......................413
1939 ......................585
1940 .....................1085
1941 .....................1128
1942 .....................1212

Model 650 Series Crawler

1970 .....................6501
1971 .....................7183
1972 .....................7438
1973 .....................7800
1974 .....................7991

Model H-3 and HD-3 Crawler

1960 .....................1001
1961 .....................1250
1962 .....................3199
1963 .....................6001
1966 .....................8856
1967 .....................9483
1968 .....................9700

SN Location: at front of torque housing flange on either side.

Model HD-4 Crawler

1966 .....................1244
1967 .....................2690
1968 .....................3001
1969 .....................3906

Model HD-5 Crawler

1946 ........................1
1947 ........................7
1948 .....................1358
1949 .....................4316
1950 .....................7499
1951 ....................11071

SN Location: at upper right corner at rear of transmission case.

Model HD-7 Crawler

1940 ........................3
1941 ......................503
1942 .....................1137
1943 .....................5403
1944 .....................5753
1945 .....................8949
1946 ....................12382
1947 ....................13236
1948 ....................15117
1949 ....................16769
1950 ....................18094

SN Location: at upper right corner at rear of transmission case.

Model HD-7W Crawler

1943 ....................2977W
1944 ....................5285W
1945 ....................7998W
1946 ...................12091W
1947 ...................13078W
1948 ...................15156W
1949 ...................16752W
1950 ...................18086W

Model HD-10 Crawler

1940 ........................2
1941 ......................642
1942 .....................1446
1943 .....................2856
1944 .....................3652
1945 .....................4897
1946 .....................6103
1947 .....................6576
1948 .....................7799
1949 .....................8710
1950 .....................9634

SN Location: at upper right corner at rear of transmission case.

Model HD-10W Crawler

1942 ....................1446W
1943 ....................2082W
1944 ....................2339W
1945 ....................4095W
1946 ....................5964W
1947 ....................6463W
1948 ....................7602W
1949 ....................8676W
1950 ....................9631W

SN Location: at upper right corner at rear of transmission case.

Model HD-14 and HD-14C Crawler

1939 .......................18
1940 .......................26
1941 ......................549
1942 .....................1166
1943 .....................2113
1944 .....................3138
1945 .....................4259