Toro GROUNDSMASTER 1000L Operator's Manual page 24

Maintenance
hour intervals. The correct spark plugs to use are
NGK BMR 6A or equivalent. Set the air gap at
.024–.028 in.
1. Clean the area around the spark plugs so dirt
does not fall into the cylinders when the plugs
are removed.
2. Pull the wires off the spark plugs and remove
the plugs from the cylinder head.
Figure 24
1. Spark plug wire
3. Check the condition of the center and side elec-
trodes to determine the operating temperature of
engine:
A. A light brown insulator tip indicates cor-
rect spark plug and heat range.
B. A black or oily insulator tip indicates an
excessively rich fuel mixture, possibly
caused by a dirty air cleaner element or a
carburetor that is set too rich.
C. A light gray or blistered white insulator
indicates overheating caused by a lean car-
buretor setting or incorrect spark plug (heat
range too high).
IMPORTANT: A cracked, fouled or dirty spark
plug must be replaced. Do not sandblast, scrape
or clean electrodes by using a wire brush because
grit may release from the plug and enter the com-
bustion chamber, resulting in engine damage.
24
4.
SERVICING THE PTO BELT
1
Check the tension of belt initially after the first day
of operation and every 100 hours thereafter.
To Check PTO Belt Tension:
1.
2.
3.
4.
To Replace The PTO Belt:
1.
2.
3.
4.
5.
6.
Figure 25
After setting the air gap at .024–.028", install
spark plug in cylinder head. Tighten plugs to
23 Nm. Push the wires onto the spark plugs.
Turn the engine off and remove the ignition key.
Set the parking brake. Raise the engine hood
and let the engine cool.
Loosen the tensioning rod jam nut (Fig. 26).
Adjust the spring to a length of 1.9" (4.8 cm).
Tighten the jam nut.
Turn off the engine and remove the ignition key.
Set the parking brake. Raise the hood and
allow the engine to cool.
Loosen the tensioning rod jam nut (Fig. 26).
Loosen the belt tensioning spring (Fig. 26) all
the way.
Rotate PTO pulley toward the engine and
remove the belt (Fig. 27).
Install the new PTO belt and re-tension the pul-
ley spring to 1.9" (Fig. 26).
Tighten the jam nut (Fig. 27) and close the
hood.