Toro GROUNDSMASTER 580-D 30581 Operator's Manual page 43

compression spring (Fig. 62) will be approximately 11.3
cm.
4. Tighten jam nuts to secure adjustment. Replace the
covers.
1. Tension arm
2. Jam nuts
Outboard Cutting Units
1. Remove deck covers. To check belt tension, apply
35.5 Nm force at mid-span of the belt and check
deflection. There should be approximately 7.9mm
deflection. If deflection is incorrect, proceed to step
2. If deflection is correct, proceed to step 3.
2. To tension belts, loosen the flange locknut at the top
of the idler pulley (Fig. 65). Slide the pulley
against the belt until proper tension is reached.
Hold the pulley in position and tighten the locknut.
1. Idler pulley flange locknut
2. Drive belts
3. Replace deck covers.
REPLACING BLADE DRIVE BELTS
Position the machine on level surface, lower the cutting unit
to the shop floor, engage the parking brake, shut the engine
off and remove the key from the ignition switch.
Figure 64
Figure 65
Front Cutting Unit
Note: To remove the center section belt, wing spindle drive
belts must first be removed.
1. Remove deck covers. Lift each wing to release the
idler pulley tension and slip the belt off the pulleys.
2. Loosen the jam nuts securing the tension plate until
the compression spring on the idler assembly is
relaxed (Fig. 64).
3. Remove the idler pulley belt retainer.
4. Remove the flange head screws securing the
gearbox plate and separate the plate and drive motor
assembly from the deck (Fig. 62). Be careful not to
bend, twist, kink or damage flexible hydraulic lines.
5. Remove the old belt. Position the new belt in the
pulleys and assemble the gear box and plate
assembly to the deck.
6. Adjust the belt tension; refer to Adjusting Cutting
Unit Belt Tension.
7. Install the idler pulley belt retainer.
8. Install the wing drive belts. Lift the wings to allow
belts to slip over outer drive spindle pulleys and
install covers.
Outboard Cutting Units
Note: To remove the lower belt, the other two belts must
first be removed.
1. Position the machine on level surface, lower the
cutting unit to the shop floor, engage the parking
brake, shut the engine off and remove the key from
the ignition switch.
2. Remove the deck covers. Loosen the flange locknuts
on the idler pulleys and slide the pulleys away from
the belts.
3. Remove the flange head screws securing the
gearbox plate to the deck. To separate the plate and
drive motor assembly from the deck, rotate the plate
end toward the traction unit (Fig. 65). Tip the plate,
motor and pulley assembly on its side and remove
them from the deck. Be careful not to bend, twist,
kink or damage flexible hydraulic lines.
Maintenance
43