From what I find in the JD parts catalogs 400D gets you "400D Articulated Dump Truck". When you say 400D, 400-d, etc., because it is diesel, it only confuses things as people are looking for a D series 400 tractor, which does not exist. Since these were available as gas or diesel, referring to it as a diesel 400 or 400 diesel would be best, omit the capital D.
To clear up confusion what is the entire serial number info from the tag. The tag should be on the right side of the transmission about 6 inches above the running board and transmission dipstick.
As for the tach. From the parts catalog it looks like there may have been a different cam used when tachometer equipped, as the tach cable was driven from gear installed in the rear of the camshaft. If it is equipped for a tach, there should be a place for the cable and driven gear to connect in the clutch housing plate at the rear of the engine about in line with the rear end of the cam.
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Today's Featured Article - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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