Toro 73546 Wheel Horse 520Lxi Operator's Manual page 26

Maintenance
POTENTIAL HAZARD
If you leave the key in the ignition switch, someone could start the engine.
WHAT CAN HAPPEN
Accidental starting of the engine could seriously injure you or other bystanders.
HOW TO AVOID THE HAZARD
Remove the key from the ignition switch and pull the wire(s) off the spark plug(s)
before you do any maintenance. Also push the wire(s) aside so it does not
accidentally contact the spark plug(s).
Air Cleaner
Service Interval/Specification
Foam Element: Clean and re-oil after every 25
operating hours, or yearly, whichever occurs first.
Paper Element: Replace after every 100 operating
hours or yearly, whichever occurs first.
Note: Service the air cleaner more frequently
(every few hours) if operating
conditions are extremely dusty or
sandy.
Removing the Foam and Paper Elements
1. Disengage the power take off (PTO), set the
parking brake, lower the attachment lift, and turn
the ignition key to "STOP" to stop the engine.
Remove the key.
2. Open the hood.
3. Clean around the air cleaner to prevent dirt from
getting into the engine and causing damage (Fig.
23).
24
2
Figure 23
1. Wing bolt
2. Washer
4. Remove the wing bolts, washers, air intake duct,
and air cleaner cover (Fig. 23).
4
1 3
m–3425
3. Air cleaner cover
4. Air intake duct