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4. Remove the idler pulley and the worn belt (Fig. 42).
5. Install the new mower belt.
6. Install the idler pulley.
7. Engage the blade control (PTO) lever and check the belt
tension. Refer to Adjusting the Mower Belt Tension,
page 35.
Note: The proper mower belt tension is 10–15 lbf.
(44–67 N) with the belt deflected 1/2 inch (13 mm) halfway
between the pulleys (Fig. 43).
2
1
Figure 43
1. Mower belt with 1/2 inch
(13mm) deflection
8. Engage the blade control (PTO) lever.
9. Check the clearance between the bell crank and the
transmission output shaft (Fig. 44).
1
4
5
Figure 44
1. 1/16–1/8 inch (2–3 mm)
2. Bell crank
3. Transmission output shaft
Note: The clearance should be 1/16–1/8 inch (2–3 mm).
1/2 in.
(13 mm)
m-4750
2. Idler pulley
3
2
6
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4. Hairpin cotter
5. Clevis pin
6. Clevis
10. Remove the hairpin cotter and the clevis pin from the
bell crank.
11. Rotate the clevis clockwise on the rod to increase the
clearance; rotate it counterclockwise to decrease it
(Fig. 44).
12. Disengage the blade control (PTO) lever.
Note: If the assist arm does not contact the front stop on
the mower deck (Fig. 45), adjust the clevis to bring the
bell crank closer to the transmission output shaft
(Fig. 44).
5
1. 1/2 inch (13 mm)
deflection here
2. Assist arm
13. Check the belt guide under the engine frame for the
proper adjustment (Fig. 42).
Note: The distance between the belt guide and the
mower belt should be 1-1/4 inch (32 mm) when you
engage the mower belt. Adjust the mower belt as
necessary. The disengaged belt should not drag or fall
off the pulley when the guides are properly adjusted.
Adjusting the Mower Belt
Tension
Service Interval/Specification
Check the belt tension after the first 8 operating hours and
25 operating hours thereafter. Check the belt tension after
every 50 operating hours.
Important
The belt must be tight enough to not slip
during heavy loads while cutting grass. Over tensioning the
belt will reduce the bearing life of the belt and the spindle.
1. Disengage the blade control (PTO) lever and set the
parking brakes.
2. Stop the engine and wait for all moving parts to stop
before leaving the operating position.
35
4
2
1
Figure 45
3. Front stop
4. Locknut
5. Turnbuckle
3
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