There is a serial break between stage 1 and 2 of both the SH and SM. That is not to say that all stage 2's had live hydraulics. It is possible that some late stage 1's could have had the battery under the seat, also probably impossible to tell if the dealer or owner did it instead of the factory. IH sometimes snuck things into the last few models of an existing tractor. But the thing to go by is the serial number. The serials of the change to the battery under the seat and to live hydraulics are the same, I haven't paid much attention to the other minor ones such as number of bolts holding the starter, etc. The RPM people are less knowledgeable about the letter series than the ones on this forum. They are more inclined to be posting about the 460/560 up, and in a lot of cases the 4 digit numbers. Many more mistakes on that forum about the letter series than this one. Stage 1 and Stage 2 were in-house designations that caught on with the general public. Stage 3--I don't know. Since the SMTA was different enough from the SM, there is no need to use it. I don't know what you mean by a standard non MTA. There are MTA's without a torque amplifier, many of those were ordered. The MTA decal was round with no torque amplifier "leg". There is no reason to call SM's built in 54 stage 3's. Remember IH did not have yearly models. They more or less introduced a new model when it was ready, or sometimes not ready as with the 560.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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