Toro GROUNDSMASTER 455-D Operator's Manual page 41

1. Adjuster bolt
2. Jam nut
IMPORTANT: The blade plane is adjusted at the
factory and should not need further adjustment.
Adjusting Belt Tension
Each cutting unit drive belt is individually tensioned by
a self-tensioning, spring-loaded idler. When the idlers
are properly adjusted, the black plastic sleeve should be
flush (even) with the edge of the idler support. ,When
12mm of the plastic sleeve is exposed, an adjustment is
required. To assure proper operation of the cutting unit,
check the adjustment of the spring loaded idler after the
first 10 hours of operation and every time maintenance
on the belt is required.
1. Lower the cutting unit to the shop floor. Remove
the belt covers from the center and wing cutting
units.
2. Measure the length of the exposed black plastic
sleeve. If the distance is 0–12mm, the spring-
loaded idler is properly adjusted and belt tension is
correct. If the dimension is not correct, go to the
next step.
1. Spring-loaded idler
2. Idler support
3. Black plastic sleeve
3. Loosen the (2) flange head nuts securing the idler
Figure 71
Figure 72
adjustor tube to top of the cutting deck.
4. Loosen the jam nut on the adjusting screw and turn
the screw until the black plastic sleeve is flush
(even) with the edge of the idler support.
5. When distance is attained, tighten the jam nut on
the adjusting screw and (2) flange head nuts
securing the idler adjustor tube to the top of the
cutting deck.
6. Check adjustment on the other adjustors and repeat
procedure if required.
Replacing Drive Belts
The blade drive belts are very durable, but after many
hours of use, the belts will show signs of wear. Signs of
a worn belt are: squealing when the belt is rotating,
blades slipping when cutting grass, frayed edges, burn
marks and cracks. Replace a belt if any of these
conditions are evident.
1. Lower the cutting unit to the shop floor. Remove
the belt covers from the center and wing cutting
units.
To Remove Wing Deck Belts
The idler pulley spring is loaded; use caution
when relieving spring tension on the wing belt.
2. To relieve tension on the wing belt, pull back on
idler pulley until the holes in idler adjustor tube and
the tube sleeve are aligned. Thread a 5/16-18
capscrew into the holes' retaining parts.
40
WARNING