Toro 30789, Руководство оператора

Страница: 34 / 41

33
BRAKE MAINTENANCE
ADJUSTING BRAKES
Adjust the service brakes when there is more than one
inch (25 mm) of “free travel” of the turn pedals, or when
the brakes do not work effectively. Free travel is the
distance the brake pedal moves before braking
resistance is felt.
The brakes should only need adjusting after
considerable use. These periodic adjustments can be
performed where the brake cables connect to the brake
pedal mount. When the cables are no longer adjustable,
the star nut on the inside of the brake drum must be
adjusted to move the brake shoes outward. However,
the brake cables must be adjusted again to compensate
for this adjustment.
1. To reduce free travel of turn pedals—tighten the
brakes—loosen front nut on threaded end of brake
cable (Fig. 46). Then tighten rear nut to move cable
backward until turn pedals have 1/2 to 1 inch (13 to 25
mm) of free travel. Tighten front nut after brakes are
adjusted correctly.
1
Figure 46
1. Jam nut
2. When adjustment of brake cable cannot get free
travel within 1/2 to 1 inch (13 to 25 mm), the star nut
inside the brake drum must be adjusted. However,
before adjusting the star nut, loosen brake cable nuts to
prevent unnecessary strain on the cables.
3. Loosen five wheel nuts holding wheel and tire
assembly on wheel studs.
4. Jack up machine until front wheel is off the shop
floor. Use jack stands or block the machine to prevent it
from falling accidentally.
5. Remove wheel nuts and slide wheel and tire
assembly off studs. Rotate brake drum until adjusting
slot is at bottom and centered over star nut that adjusts
brake shoes (Fig. 47).
1
Figure 47
1. Slot
6. Using a brake adjusting tool or screwdriver, rotate
star nut down until brake drum locks because of outward
pressure of brake shoes (Fig. 48).
1
2
2
Figure 48
1. Star nut 2. Brake shoes
7. Loosen star nut about 12 to 15 notches or until
brake drum rotates freely.
8. Install wheel and tire assembly on studs with five
wheel nuts. Tighten nuts to 45-55 ft–lb (61-75 N m).
9. Remove jack stands or blocking and lower machine
to the shop floor.
10. Adjust the brake cables using step 1.