![]() The shifter just provides a positive stop to the pedal when you release it. The slots are there so as you depress the brake/clutch you don't need move the shifter everytime you stop. As you brake/clutch or shift to a lower speed the idler takes up the slack as the sheave returns to normal position. This forces to belt outwards effectively acting like a larger pulley is now there. This in turn via linkages from the brake/clutch pedal allows the very large spring to pull the sheave assembly rearwards along its rotating axis thus applying more tension on the engine to sheave belt which forces the sheave to slide closing the gap that the rear belt has to ride in. As shifter is moved to higher speeds it allows the Brake/Clutch to rotate more from the depress position. The sheave is spring loaded just like most idlers that automatically keeps belts tensioned. When in doubt about the size use OEM belts. Now in a standard 5/8" the size would be 43.94". 7 x 44.2" you can't simply throw in a 43" or 44" and expect it to properly. ![]() The belt sizes are critical though on this system and not just any close enough sizes will work properly. Personally this is a much more liable system than the hydro static especially went towing a small loaded trailer as there is no hydro slippage. This should be the mid point pulley as shown in gallery view. As tension is released the reverse happens slowing the transaxle. This change results in an increase in the speed that belt moves that drives the transaxle input pulley. As the belt tension from PTO is increase it cause pulley diameter for that belt to decrease thus increasing the driven diameter (Sliding sheave to transaxle). ![]() This system uses a sliding sheave pulley to variable drive and driven pulleys diameter.IE: The center divider slides up and down). If the LT-12 IPL that I am looking at is the correct one it would be the MTD variable speed belt system with a single speed transaxle. ![]()
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March 2023
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