I have a the original sales literature for this series of tractors and can say for 100% cetrain that the 1912 has no power steering...as mentioned before, the 1872 was the first to come std with PS.
My literature collection is actually very complete for these machines..as follows....
The 1912 falls into the family as follows: (Concurrent with last part of red 82 series production, ~1984)
1210 (same as 1282, 12hp K-301 manual lift)
1604 (same a 582 special 4 speed peerless, 16hp B&S)
1606 Same as 582,3 speed with creeper, 16hop B&S)
1710 (same as 682, 17hp Kohler, manual lift)
1711 (same as 782)
1712 (same as 782 with dual hyd)
1512 (same as 782D, dual hyd)
1912 (same as 982, Onan, dual hyd, brakes (NO PS))
1914 (1912 with 3pt and rear PTO)
in the next series the numbering went as follows (First "82 series that is all MTD fully under MTD dealerships and marketing, IH is out of the picture completely)
1204 (12hp K-301 manual lift, 4speed peerless)
1210 (12hp K-301 hydro, manual lift)
1211 (1210 with hyd lift)
1806 (18hp Magnum twin, manual lift 3 speed w/creeper)
1810 (18hp Magnum twin, manual lift hydro)
1811 (1810 with hyd. lift)
1812 (1811 with dual hyd.)
1572 (SGT diesel, dual brakes, dual hyd. hydro, PS)
1872 (SGT 18 Mag Twin,dual brakes, dual hyd. hydro, PS)
2072 (SGT 20 Mag Twin,dual brakes, dual hyd. hydro, PS)
Note: Mid production 1572 went to 1772 with bigger diesel engine.
Next: (Cyclops I)
1335 12.5 kohler, 3 speed gear, manual lift
1340 12.5 Kohler, hydro, manual lift
1535 15 hp Hohler twin, 6 speed gear, manual lift
1541 15 hp Kohler twin, hydro, manual lift
1860 18hp Kohler twin, hydro , manual lift
1862 18hp Kohler twin, hydro, hyd lift, PS
1782 17hp Kubota diesel, SGT, hydro, PS, hyd lift, dual remotes optional, dual brakes std.
1882 18hp gas version of 1782
2082 20hp gas version of 1882
2182 21hp Kubota GAS version of 1782.
finally....(Cyclops II)
1440 14hp B&S OHV Vanguard, hydrogear hydro, manual lift
1641 16hp B&S OHV Vanguard, hydrogear hydro, hyd. lift
1863 18hp OHV Kohler Command, hydrogear hydro, hyd. lift
1864 18hp OHV Kohler Command, Sunstrand hydro, hyd. lift, PS
1782 17hp SGT diesel, PS
2086 20hp OHV Kawasaki liquid cooled gas SGT, PS
2284 22hp OHV Kohler Command SGT, PS