Belt Tension Adjustment - Toro Groundsmaster 580-D Service Manual

Belt Tension Adjustment

IMPORTANT: After first ten hours of operation, check
new belts for proper tension; thereafter, check tension
every 50 hours.
Front Cutting Unit (S/N below 220000000)
Note: Belts for wing unit spindles are tensioned by
spring loaded idlers and normally do not require tension-
ing.
1. Position machine on level surface, lower cutting unit
to shop floor, engage parking brake, shut engine off and
remove key from ignition switch.
2. Remove deck covers.
3. Note position of shoulder bolts in slots in tension
plate. Optimum belt tension will be maintained when the
flanges on the shoulder bolts are 1/8 in. (3 mm) from the
pulley ends of the slots (Fig. 9A). If the shoulder bolt
flanges are more than 3/8 in. (9 mm) from the pulley end
of the slots, an adjustment should be made.
4. To adjust, loosen jam nuts (Fig. 9B) and extend ten-
sion arm until the shoulder bolt flanges are within 1/8 in.
(3 mm) of the pulley end of the slots (Fig. 9A).
Note: When the shoulder bolt flanges are positioned 1/8
in. (3 mm) from the pulley end of the slots, the length of
the compression spring (Fig. 8) will be approximately 5
in. (127 mm).
5. Tighten jam nuts to secure adjustment. Install deck
covers.
Front Cutting Unit (S/N 220000001 and above) (Fig.
9C)
1. Position machine on level surface, lower cutting unit
to shop floor, engage parking brake, stop engine and re-
move key from ignition switch.
2. Remove deck covers.
3. Loosen jam nut and relieve tension on springs with
tensioner bolt.
4. Loosen four (4) cap screws securing slide plate to
motor mount.
5. Tighten tensioner bolt until springs are compressed
to dimension shown in Figure 9C.
6. Tighten jam nut to secure adjustment.
7. Tighten four (4) cap screws securing slide plate to
motor mount.
8. Install deck covers.
Adjustments
4
1. Compression Spring and Tension Plate
2. Wing Unit Drive Belt
3. Gearbox Plate
4. Center Drive Belt
5. Lift Arm
2
1/8 in.
(3 mm)
1. Tension Plate
1
1. Tension Arm
Page 7 - - 6 Rev. E
5
2
1
Figure 8
1
Figure 9A
2. Shoulder Bolts
2
2
Figure 9B
2. Jam Nuts
Groundsmaster 580--D
3