46
www.ferrisindustries.com
Figure 45. Mower PTO Belt
A. Spring-loaded Idler Pulley
B. Idler Spring
C. Stationary Idler Pulley
B
A
C
Troubleshooting, Adjustment & Repair
A
B
C
61” Side Discharge Model
72” Side Discharge Model
Adjusting the Mower Belt Spring Length
1. Loosen the jam nut (C) on the anchor eyebolt (B).
2. Turn the adjustment nut (D) until the measurement
as indicated in the chart is achieved.
3. Retighten the jam nut.
4.
61” Side Discharge:
Using a 3/4” combination
wrench rotate the spring-loaded idler pulley (A,
Figure 45) COUNTER-CLOCKWISE to release the
belt tension.
4a.
72” Side Discharge:
Using a 3/4” combination
wrench, rotate the spring-loaded idler pulley
(A, Figure 45) CLOCKWISE to release the belt
tension.
5. Slide the drive belt over the edge of the stationary
idler pulley (C) and carefully release the tension on
the wrench until the spring tension is completely
released.
6. Remove the old belt and replace with a new one.
7. Install the drive belt on the gearbox pulley, the
spindle pulleys and idler pulleys.
8.
61” Side Discharge:
Rotate the spring-
loaded idler pulley (A, Figure 45) COUNTER-
CLOCKWISE and slide the drive belt over the
edge of the stationary idler pulley (C). Make sure
the V-side of the belt runs in the pulley grooves
(Figure 48). Carefull release the tension on the
wrench.
8.
72” Side Discharge:
Rotate the spring-loaded
idler pulley (A, Figure 45) CLOCKWISE and slide
the drive belt over the edge of the stationary
idler pulley (C). Make sure the V-side of the belt
runs in the pulley grooves (Figure 46). Carefully
release the tension on the wrench.
9. Reinstall the mower deck guards and tighten the
5/16” hardware to secure in place.
10. Run the mower under no-load condition for
approximately 5 minutes to break in the belt.
Check the Mower Belt Tensioner Spring Length
1. Lower the mower deck to its lowest cutting
position.
2. Measure the coil length (E, Figure 46) of the
mower belt tensioner spring (A). The measurement
should equal the measurement as indicated in
the chart. If the measurement does not equal the
measurement as indicated in the chart, adjust the
mower belt spring length.
Figure 46. Mower Belt Idler Spring Length
A. Mower Belt Tensioner Spring
B. Anchor Eyebolt
C. Jam Nut
D. Adjustment Nut
E. Measurement
Mower Belt Idler Spring Length
inch
cm
61” Mower Deck
7
17.8
72” Mower Deck
6-1/4
15.9
A
D
E
B
C
Not
for
Reproduction
