Illustration of correct and incorrect track tension on the M4A2 tank from the M4A2 technical manual. The tank crew were instructed to inspect the track tension regularly and tighten the track if it shows noticeable sag.
Track with insufficient tension
Track with proper tension
Source: TM 9-731B: Medium Tank M4A2, War Department Technical Manual, January 1943.
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Very good pictures to show proper alignment and tension. Thks.