Toro TX 420 Operator's Manual page 32

Replacing the Tracks (TX 425, Model
22307)
When the tracks are badly worn, replace them.
1. Lower the loader arms, stop the engine, and remove
the key.
2. Lift/support the side of the unit to be worked on so that
the track is 3 to 4 inches (7.6 to 10 cm) off of the
ground.
3. Remove the locking bolt and nut (Fig. 36).
4. Using a 1/2 inch drive socket, release the drive tension
by turning the tensioning screw clockwise (Fig. 36
and 38).
4
1
3
9
6
m–6706
Figure 38
1. Track
2. 1/2 inch socket
3. Tension wheel nut
4. Outer tension wheel
5. Fork tube
5. Push the tension wheel toward the rear of the unit to
move the tension tube against the frame (Fig. 38). (If it
does not touch the frame, continue turning the
tensioning screw until it does.)
6. Remove the nut securing the outer tension wheel and
remove the wheel (Fig. 38).
7. Remove the track (Fig. 38).
8. Remove the nut securing the inner tension wheel and
remove the wheel (Fig. 38).
9. Pull the 4 large washers out of the 2 wheels, 1 on each
side of each wheel.
10. Clean the old grease and dirt out of the area between
where the washers were installed and the bearings
inside the wheels, then fill this area on each side of
each wheel with grease.
11. Install the large washers on the wheels over the grease.
10
5
8
7
2
6. Track lug
7. Drive sprocket
8. Sprocket spacer
9. Road wheels
10. Inner tension wheel
12. Install the inner tension wheel and secure it with the
nut removed previously (Fig. 38).
13. Torque the nut to 300 ft-lb (407 N⋅m).
14. Install the new track, ensuring that the lugs in the track
fit between the spacers in the middle of the drive
sprocket (Fig. 38).
15. Install the outer tension wheel and secure it with the
nut removed previously (Fig. 38).
16. Torque the nut to 300 ft-lb (407 N⋅m).
17. Turn the tensioning screw counter-clockwise until the
distance between the tension nut and the back of the
tension tube (Fig. 35) is 2-3/4 inches (7 cm).
18. Align the closest notch in the tension screw to the
locking bolt hole and secure the screw with the locking
bolt and nut.
19. Repeat steps 2 through 18 to replace the other track.
20. Lower the traction unit to the ground.
Maintaining the Road Wheels
Check and grease the road wheels every 250 operating
hours or yearly.
1. Remove the tracks; refer to Replacing the Tracks,
page 31.
2. Remove the 4 bolts securing each lower track guide
which contains the road wheels, and remove them
(Fig. 39).
3
1
3
Figure 39
1. Road wheels
2. Lower track guide
3. Remove the snap ring and cap from a road wheel
(Fig 40).
32
2
3. Track guide bolts (only
two shown)