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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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