I had a '74 or '79, forget which diesel, with cab. Only problem with it was a clogged radiator. Bought it with 3900 orig. hours and cosmetically completely restored. Engine didn't have a wrench on it.
Mine was somewhat hard to start in the winter till I redid the battery hookup. Rather than run 2ea 6v batteries in SERIES with ground on the right side of the block and the starter on the left, not one of mother Deere's better designs, and as I recall running 1/0 wire, I rewired it.
I put in two 12v series 31 OTR truck batteries of 900 cca each, 3/8 stud terminals and wired them in PARALLEL with 2/0 copper wire. It meant running two big wires under the cab over to the right side to catch that battery, but so what!
With my wiring the batteries were in parallel, which reduced that series resistance to 1/4 what it was as far as the starting current loop was concerned. Then I wired the left battery plus directly to the starter solenoid and the neg to one of the bolts holding the starter to the block both with about 1 1/2 ft. of 2/0 each. Everything was clean, shiny, and tight.
Forget cold weather. That sucker spun up so fast that you had to worry about blowing out the tires on the down side. Ha! Naw not really , but I never touched an ether can again.
I don't know what you call it but I had the shift lever that you could toggle between two adjacent gears in the same range. Worked neat as I could run the row in the higher gear, pop the shift lever to the lower in the turn, and coming out pop it back to the higher gear.