Self-Propelled Drive Cleaning; Exhaust Ports - Toro 20709 Operator's Manual

Self-propelled Drive Cleaning

(self–propelled models only)
Under certain conditions clippings can collect under
belt drive cover and in pulley groove. This could
cause belt slippage, loss of self–propelled drive or
failure to disengage self-propelled drive.
Clean grass clippings and debris from under belt
cover every 25 hours of operation.
1. Remove screw and slide belt cover to rear,
unhooking tab on front of cover from deck
opening. Tilt cover up to the side and remove
debris (Fig. 29) from under cover and pulley
groove.
2. Reverse procedure to install belt cover.

Exhaust Ports

Carbon deposit build-up causes excessive wear and
loss of power. Check and clean if necessary.
1. Remove spark plug. See SPARK PLUG section.
2. Drain gasoline using a hand pump.
3. Tip mower on its right side (Fig. 21).
POTENTIAL HAZARD
Gasoline is extremely flammable, highly
explosive and under certain conditions can
cause personal injury or property damage.
WHAT CAN HAPPEN
Tipping mower may cause fuel leakage
from carburetor or fuel tank.
HOW TO AVOID THE HAZARD
Avoid fuel spills by running engine dry or
remove gas with hand pump, never siphon.
15
4. Remove the blade nut and blade (Fig. 23). See
BLADE REMOVAL section.
5. Remove blade driver by tapping with plastic or
fiber hammer in the direction of rotation
(Fig. 30). This will loosen the blade driver from
taper on crankshaft.
6. Remove capscrews attaching muffler cover and
baffle plate to engine mounting plate (Fig. 31).
7. Clean carbon deposits from muffler cover and
baffle plate with wire brush making sure exhaust
vents are clear. Wipe muffler clean with paper
towel or rag.
8. Rotate crankshaft slowly until piston covers
exhaust ports (Fig. 32).
9. Using a 3/8 inch wooden dowel loosen carbon
deposits by inserting dowel into ports.
Note: Do not use metal tools; they could
scratch piston.
10. Set mower upright.
11. Hold blade control bail against upper handle
(Fig. 33) and pull starter rope several times to
blow out loose carbon.
12. Install baffle and muffler cover to engine
mounting plate (Fig. 31). Torque muffler
capscrews to 155 in.–lbs. (13 ft.–lbs.) (18 N m).
13. Attach blade driver and blade with blade nut.
See BLADE INSTALLATION.
14. Torque blade nut to 47 ft.–lbs. (63 N m).
15. Tip mower upright.
16. Reconnect spark plug wire when maintenance is
completed.
17. Fill fuel tank with clean, fresh gasoline/oil mix.