Replacing The Blade-Drive Belt - Toro Groundsmaster 4100 Operator's Manual

Replacing the Blade-Drive
Belt
Service Interval: Every 800 hours
The blade-drive belt, tensioned by the spring-loaded
idler pulley, is very durable. However, after many
hours of use, the belt will show signs of wear. Signs of
a worn belt are: squealing when the belt is rotating,
blades slipping when cutting grass, frayed edges,
burn marks, and cracks. Replace the belt if any of
these conditions are evident.
1. Lower the mower deck to the shop floor, remove
the belt covers from the top of the mower deck,
and set the covers aside.
2. Loosen the eye bolt
3. Loosen the flange nut securing the stop bolt to
the mounting tab and move the idler pulley away
from the belt (Figure
Note:
Loosen the nut enough to allow the idler
arm to pass the stop bolt.
Note:
If you must remove the stop bolt from the
mounting tab, install it in the hole that aligns the
stop-bolt head with the idler arm.
4. Remove the bolts securing the hydraulic motor
to the mower deck
Figure 115
1. Hydraulic motor
5. Lift the motor off the mower deck and lay it on
top of the mower deck.
6. Remove the old belt from around the spindle
pulleys and idler pulley.
7. Route the new belt around the spindle pulleys
and idler-pulley assembly.
8. Position the hydraulic motor on the mower deck
after routing the belt around the pulleys. Mount
the motor to the mower deck with the bolts
previously removed.
Note:
Ensure that the belt is positioned on the
spring side of the belt guide
(Figure 114).
114).
(Figure 115).
2. Mounting bolts
(Figure 114).
9. Connect the extension spring
eye bolt and tension the belt as follows:
•
When properly tensioned, the inside
measurement of the extension spring (hook
to hook) should be approximately 8.3 to 9.5
cm (3-1/4 to 3-3/4 inch).
•
When you attain the correct spring tension,
adjust the stop bolt (carriage bolt) until there
is approximately 2 to 5 mm (0.065 to 0.185
inches) clearance between the head of the
bolt and the idler arm.
g011511
76
(Figure 114) to the