A 756 does not use a starter that depends on inertia to engage like the letter series tractors do. Instead it uses a drive that is shifted into place with a lever controlled by the solenoid. If that type of drive does not crank the engine while the starter motor is turning there is a failure of the clutch in the drive just as charlieu has posted. Replacement of the drive is the only way to repair the starter. Unless some has recently repaired the starter without replacing the drive, when you get the starter apart you are going to find it needs more service than just replacing the drive.
Since you have not said whether the tractor your are posting about has a gas or a diesel engine I'm going to assume that you have a diesel since you came up with 1877350 as a replacement drive number.
There are several drive numbers that will work in your starter. The original drive for the diesel starter is part number 1948877 which is a roller clutch type drive. That number has a little heavier roller clutch than number 1933838 which was used in the 706 with the D282 engine. Part number 1877350 is still a roller clutch type drive but it is heavier than the other two numbers listed here. It is the drive that was used in the 66 series gear drive tractors.
The 1066 Hydro used drive part number 800965. This drive has a spragg type clutch rather than a roller clutch.
There is one other type of drive that can be used. It uses a ratchet type clutch. I don't have a Delco part number for it. I'm not sure if Delco even built one like it. My supplier part number 5002GN but SDR5076 is the same drive from another vendor. In both cases they list it as a replacement drive for part number 1877350 even though it has a different type clutch.
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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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