Gravely 991079 - Page 31

EN - 31
5. Remove short mower belt from right
blade spindle and from deck. Idler pivot
bolt must be loosened slightly to gain
clearance to remove belt from under
idler pulley (Figure 20 and Figure 21).
6. Arrange new mower belt(s) on deck
(short belt first). Retighten short mower
belt idler pivot bolt. Install belts on
sheaves. Put belts onto center sheave
last.
NOTE: The PTO idler spring length range is
12.25 – 12.5" (31 – 31.8 cm) measured at a
3.5" (8.9 cm) cutting height. Adjust the idler
spring length as needed (Figure 22 and
Figure 23).
7. Replace the belt guide bolt on the idler
arm.
8. Replace belt covers and return foot
board to closed position.
Figure 20
1. PTO Mower Belt
2. Mower Drive Belt
3. Springs
4. Mower Drive Belt Idler
5. PTO Mower Belt Idler
6. Mower Clutch Sheave
7. Center Sheave
8. Belt Guide Bolt
1
2
4
7
6
5
3
8
48" and 52" Belt Layout
Figure 21
1. PTO Mower Belt
2. Mower Drive Belt
3. Springs
4. Mower Drive Belt Idler
5. PTO Mower Belt Idler
6. Mower Clutch Sheave
7. Center Sheave
8. Belt Guide Bolt
1
2
4
7
6
5
3
8
60" Belt Layout
3
Figure 22
The PTO idler spring length range is
12.25 – 12.5" (31 – 31.8 cm) measured at
a 3.5" (8.9 cm) cutting height. Adjust as
necessary.
Measure PTO
idler spring
length here.
48" and 52" PTO Idler Spring Length