Installing The Mower; Adjusting The Blade Drive Belt - Toro 170-DH Operator's Manual

8. Pull the idler arm assembly in and remove the V-belt
from the pulley (Fig. 39).
1
2
8
6
7
10
Figure 39
1. Idler pulley and idler arm
assembly
2. V-belt
3. Engagement spring
4. Rear hairpin clips
5. Rear pins
6. Front hairpin clips
Note: The bag-on-demand assembly is not shown for the
purpose of clarity.
9. Disconnect the spring from the engagement lever
(Fig. 39).
10. Release the mower from the tunnel by lifting the tunnel
off the 2 welded pins and pulling the tunnel rearward
approximately 4 in. (10 cm). Secure the tunnel to
prevent it from falling down.
11. Remove the hairpin clips from the 2 rear pins and
remove the pins (Fig. 39).
Note: You may need a pliers to pull out the second pin.
12. Remove the hairpin clip from the front pin and remove
the pin (Fig. 39).
13. Remove the V-belt from the engine pulley (Fig. 39).
14. Slide the mower out from beneath the tractor.

Installing the Mower

Reverse the procedure for Removing the Mower on
page 35.
3
4
5
9
7. Front pin
8. Engine pulley
9. V-belt pulley
10. Front suspension M12
nuts
11. Bag-on-demand
assembly (not shown)
36

Adjusting the Blade Drive Belt

Adjust the blade drive belt after the first 20 operating hours
and every 50 operating hours thereafter.
1. Remove the mower; refer to Removing the Mower on
page 35.
Note: You must remove the mower to adjust the blade
drive belt properly.
2. Remove the V-belt pulley and the idler arm assembly
(Fig. 39).
3. Remove the belt cover.
4. Loosen the 2 hex nuts on the idler pulley (Fig. 40).
2
1
3
5
Figure 40
Top View
1. Hex nuts
2. Mower belt
3. M10 nut
5. Adjust the M10 nut until the belt flexes 5 mm with 30 N
of force (Fig. 40).
6. Rotate the belt 3 revolutions.
7. Check the belt tension and adjust it if necessary.
8. Tighten the 2 hex nuts on the idler pulley.
9. Install the mower; refer to Installing the Mower on
page 36.
4
4. 30 N of force
5. 5 mm