Cub Cadet GT 2000 Garden Tractor Operator's Manual page 23

Lift Handle Adjustment (If so equipped)
The effort required to operate the implement lift handle can be
varied by loosening or tightening the lift assist spring adjusting
bolt on the left side of the tractor. See Figure 6-9.
Increase effort
Decrease effort
Adjustment Bolt
Figure 6-9
NOTE: The deck and/or attachment should be installed before
making adjustments to this spring.
Place the deck/attachment into the lowest position for making
adjustments. This ensures that the spring is extended the furthest.
The bolt can be accessed from the rear of the tractor, inside the left
rear wheel. Turning adjusting bolt clockwise will decrease the manual
effort required for lifting attachments; turning counterclockwise will
increase the effort needed to lift the attachment.
NOTE: Overtightening of the spring could cause the deck to
float and/or fail out of the notches. There should always be a
downward/forward bias on the lever for proper operation.
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