Cub Cadet GT 2521 Operator's Manual page 35

NOTE: It may be necessary to lift each side of the deck
and maneuver it slightly to align the support pins with
the holes of the lift links. Make certain the support pins
are fully extended through the lift links to prevent the
mower deck from disengaging the lift links while
mowing.
LIFT LINKS
(BOTH SIDES)
DECK SUPPORT
PIN ENGAGED
Figure 40
WARNING
The deck idler arm lever is spring loaded.
Release it slowly.
12. Disengage the deck idler arm lever from its stop
bracket and release the spring tension by rotating
the lever out and rearward (See Figure 41).
Figure 41
WARNING
If the engine has been recently operated, the
exhaust system, engine, and surrounding areas
will be hot. To avoid personal injury, allow these
areas to cool before proceeding with the
following PTO belt installation instructions.
LIFT LINK HOLE
(BOTH SIDES)
SLOT IN REAR
DECK BRACKET
IDLER ARM
LEVER
STOP
BRACKET
35
13. Pass the PTO belt upward inside the front of the
tractor frame and install the forward end of the belt
onto the PTO clutch pulley on the front of the
engine. Ensure that the narrow side of the PTO
belt engages the groove of the clutch pulley (See
Figure 42).
Figure 42
14. Twist the two sides of the PTO belt 1/4 turn inward
to engage the narrow sides of the belt into the
grooves of the two tractor front-lower pulleys (See
Figure 43).
TRACTOR FRONT
ROD/BRACKET
LOWER PULLEYS
Figure 43
15. From the front of the tractor, push the PTO belt
through the front lift rod, then to the center of the
deck. Ensure that the forward end of the belt
remains positioned inside the front lower pulleys.
16. Install the rearward end of the PTO belt on the
upper pulley of the deck center double-pulley
(Refer to Figure 44). Ensure that the narrow side
of the belt engages the groove of the upper pulley,
and that there is no more than a 1/4 twist in the belt
between the front pulleys and the double pulley.
PTO
CLUTCH
PULLEY
PTO
BELT
PTO BELT
FRONT LIFT
ASSEMBLY