Toro 78500 Operator's Manual page 24

Fan Vacuum
The bagging system operates by vacuum created by a
rotating fan mounted in the top of the hopper. If the vacuum
action is reduced, bagging performance will diminish.
Refer to Troubleshooting on page 27 for causes of reduced
performance.
Curb Climbing and Loading
Always lift the deck to the highest position when loading
the machine on trailers or ascending/descending a curb.
Leaving the mower in a lower position can cause damage to
mower baffles while loading and going over a curb. If a
curb is higher than 6 inches (152 mm), cross it at a sharp
angle with the deck fully raised. Use extreme caution
when loading onto a trailer.
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