With belt cover INSTALLED & engage lever in UP position belt should NOT move & be free of eng pulley,if you look inside of belt cover you will either have a short rail welded to inside of lower part of cover or a lip on bottom of cover.
In operation when engage lever in up position the lower loop of belt drops onto rail/lip,this supports lower loop of belt,all slack in belt is now trasfered to top loop,this causes top loop of belt to move forward & disengage eng pulley,without cover installed top/bottom loop of belt keep dropping due to their own weight keeping belt engaged with eng pulley.The actual brake/parking brake is an internal hyd function of transaxle & regulated by the position of directional control valve(for/rev) or if drive belt disengaged thru a system of relief/check valves in pump manifold,this action now traps hyd fluid in pump & hydro motor locking rear wheel,this is why you have a freewheel/tow valve on pump manifold,opening this valve 1/4-1/2 turn releases trapped hyd fluid in pump/hyd motor & allowing rear wheels to turn so you can push tractor by hand or tow.
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