Early John Deere 3010 and 4010 used a different front crankshaft seal (AR27354) which is obsolete
This is similar to a semi tractor trailer setup to power the lights on a wagon or other implements
764299M91 Massey Tractor fits MH: Colt (21)
606 With IH 380956R91 Carb
BR both SN: 333100 & up
A51339 Rear Crankshaft Seal-Fits Case Tractor 350 430 480 500B 530 600B 630 Carburetor Early John Deere 3010 andQuality Aftermarket: Rear Crankshaft Seal Fits: A51339 Case Tractor 320, 320B, 350, 420B, 430, 351, 431, 435, 441, 445, 470, 480, 500B, 510B, 511B, 530, 531, 535, 540, 541, 545, 570, 600B, 611B, 614B, 630, 632, 634, 640, 641, 642, 644 used as a rear crankshaft seal; fits ''late'' 148B, 159, 164, 188, 201 and 207 CI gas, LP, diesel engines Specifications 4. 000" I. D., 5. 004" O. D., 0. 500" wide Replacement Numbers 26 872, A36610, A39027, A39111,