H = PowrQuad or Manual Shift TransmissionĪll serial plates for Waterloo-built large tractors are now located on the right-hand frame below the engine. THE GRAPPLE HAS NEVER BEEN ON, IT SETS IN THE CORNER OF SHOP. R or (see Position 11 Transmission codes)Ĭalculated character based on the value of the other characters. The data on this manual covered all you require to know when you need to fix or administration John Deere 6020 6120 6220 6320 6420 6420S 6520 6620 Tractors. To better understand each position in the 17-digital serial number, the chart below lists the position number, use of that position and what the position means, specific to large tractors (7R, 8R/8RT Series and 9030 Series Tractors). To better understand each position in the 17-digital serial number, the chart below lists the position number, use of that position and what the position means, specific to large tractors (7030 Series Large-Frame, 8R/8RT Series and 9030 Series Tractors). John Deere Waterloo Works recently changed from a 13-digit large tractor serial number to a 17-digit serial number.