Servicing The Air Filter - Toro 20789 Operator's Manual

If the underside of the lawn mower deck has excessive
grass buildup, do the following steps:
1. Connect the hose to the washout fitting.
2. Turn the water on high.
3. Start the lawn mower and run it for two minutes.
4. Stop the engine and wait for all moving parts to stop.
5. Turn off the water.
6. Let the mower soak for 30 minutes.
7. Turn the water on high again.
8. Run the mower for two minutes.
9. Stop the engine and wait for all moving parts to stop.
Scraping Method
If washing does not remove all debris from under the lawn
mower, tip it on its left side and scrape it clean.
1. Remove the wire from the spark plug (Fig. 9).
2. Drain the gasoline from the fuel tank. Refer to steps 1
through 4 of Emptying the Fuel Tank on page 21.
WARNING
POTENTIAL HAZARD
Gasoline is extremely flammable, highly
explosive and under certain conditions can
cause personal injury or property damage.
WHAT CAN HAPPEN
Tipping the lawn mower may cause fuel leakage
from the carburetor or fuel tank.
HOW TO AVOID THE HAZARD
Avoid fuel spills by running the engine dry or
removing gas with a hand pump; never siphon.
3. Tip the lawn mower onto its left side (Fig. 20).
4. Remove the dirt and grass clippings with a hardwood
scraper. Avoid burrs and sharp edges.
IMPORTANT:
Move the blade as little as possible to
avoid future starting problems.
5. Turn the lawn mower upright.
6. Fill the fuel tank.
7. Install the wire onto the spark plug.

Servicing the Air Filter

Clean the air filter once every season or after every 25
operating hours. Clean or replace the paper cartridge after
every 100 hours or every season; more frequently in dusty
or dirty conditions.
1. Stop the engine and wait for all moving parts to stop.
2. Remove the wire from the spark plug (Fig. 9).
Note: For the electric start model, remove the key from
the switch.
3. Remove two knobs that secure the air filter cover to
the engine (Fig. 22).
4. Remove the cover and clean it thoroughly (Fig. 22).
Ï Ï Ï
Ï Ï Ï
1. Knobs
2. Cover
5. Carefully remove the pre-cleaner.
6. If the pre-cleaner is dirty, carefully wash it with a mild
detergent and water. Rinse the pre-cleaner in clean
water and allow it to dry (Fig. 22).
7. If the paper cartridge is dirty, clean it by tapping it
gently on a flat surface. Replace the cartridge if it is
very dirty.
IMPORTANT: Do not oil the pre-cleaner or the paper
cartridge. Do not use pressurized air to clean the paper
cartidge.
8. Install the pre-cleaner over the paper cartridge
(Fig. 22).
9. Install the air filter cover (Fig. 22).
10. Tighten the cover securely in place with the two knobs
(Fig. 22).
IMPORTANT: Do not operate the engine without the
air filter element; extreme engine damage could occur.
18
m-3664
Figure 22
3. Foam pre–cleaner
4. Air filter