SMTA hood is close to 1.5 inches longer than a M, SM. All don't measure exactly the same, may very 1/16 to 1/8 inch.
Only reason the hood is longer is the upper bolsters used. When the SMTA bolster is bolted to the frame rails it sets everything forward of the fan forward about 1.5 inches compared to a M or SM gas bolster. Diesel bolsters were longer from the start, so all MD, SMD and SMTAD hoods are the same length as a SMTA gas.
When the SMTA bolsters started being used on SMTA non diesel tractors a different fan shroud was used, different steering worm shaft, different coolant cast pipe at lower radiator to engine, different length upper radiator hose, longer radiator top brace and a different center steering shaft bearing or casting. All the above was changed from the last SM gas tractors made. Reason the rear of the tank has more space between the steering post is the longer center housing, That also caused the rear steering shaft to be longer. Since they used the same shaft angle as a M the longer shaft ended up being higher at the steering post. That's why a SMTA one is about 3/4 inch taller. SMTA transmission top covers are the same casting as later SM tractors but the shift forks used with a SMTA with that top only work for a SMTA or SW6TA tractor.
Picture that a SM and SMTA used the same type engines and the same length frame rails. Fuel tanks and support is the same length from rear of engine on both. Front bolster is all that makes some things longer at front from the rear of the engine on a SMTA gas. So if you use SM or the same parts from another tractor in front of the engine you end up with everything the same as a SM from the fuel tank support forward. So then a SM hood fits the same as it would on a SM. Need to use the shorter SM steering worm shaft and correct center shaft casting to fit exactly as a SM. Hydraulic reservoirs used on stage 2 SM and SMTA have 2 sets of mounting holes for the rear fuel tank support about 5 inches apart. On a SM the rear set of holes is used. On a SMTA the front set is used because the longer center housing causes the reservoir to be mounted a longer distance from the rear of engine. Fuel tank is mounted the same distance from engine rear on both tractors.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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