Carburetor Repair - Toro GTS 120 Service Manual

flywheel by hand and remove the three re-
maining capscrews retaining the starter cup
to the flywheel. (It may be necessary to insert
a screwdriver through the starter cup to hold
the flywheel should the capscrews be ex-
tremely tight.)
IMPORTANT: DO NOT DEFORM THE
MENT DIFFICULTY MAY RESULT.
STARTER CUP OR STARTER ENGAGE-
9. Use the flywheel Duller listed in the Special
10
11
Tools Section to pull the flywheel from the
crankshaft.
IMPORTANT: DO NOT PRY ON THE FLY-
WHEEL CASTING OR STRIKE THE CRANK-
SHAFT OR DAMAGE WILL RESULT.
Remove the capscrews retaining the contact
point cover and lift the cover from the engine.
Remove the small nut retaining the electrical
wires to the contact point assembly. Remove
the two ignition coil hold down screws and
lift the ignition coil and wire harness from the
engine.
Remove the two screws holding the points
and condenser in place and lift the points
and condenser from the engine. Remove the
flywheel key from the crankshaft and slide
the timing cam from the engine. There is a
small locating pin for the cam. Take care so
that this pin is not lost.
12. Loosen the clamping bolt on the governor
lever and pry the clamping section of the
lever apart with a screwdriver. Remove the
lever, control rod and springs from the
engine.
13. Disconnect the choke cable from the car-
buretor and slide the carburetor, spacer and
gaskets from the mounting studs.
IMP0RTANT: DO NOTREMOVETHECHOKE
SHAFT SCREW OR THE THREADS MAY BE-
COME STRIPPED.
CARBURETOR REPAIR
A. Drain the fuel from the carburetor bowl
by removing the bowl nut, washer and
bowl. The bowl seal may be replaced
using a seal pick if fuel leakage is noted
on the carburetor bowl.
purposely deformed to lock the pin into
the casting legs. Visually determine
which end is deformed and drive the pin
from the opposite end. Remove the pivot
pin, float, needle valve and spring
retainer
from
the assembly.
C. The main jet and the pilot circuit jet can
be removed for inspection using a flat
blade screwdriver.
B. One end of the float pivot pin is
IMPORTANT: NO OTHER PARTS ARE SERVICE-
ABLE. DISASSEMBLY OF THE THROTTLE AND
CHOKE PLATES IS NOT RECOMMENDED. THE
SCREWS ARE FACTORY TORQUED AND
LOCKED IN PLACE.
IF
NOT PROPERLY REAS-
SEMBLED THE SCREWS MAY LOOSEN AND
CAUSE ENGINE DAMAGE.
D. Reassemble the carburetor in reverse
order. The carburetor and work area
should be clean to prevent contamination
entering the small orifices in the carbu-
retor body.
14. Remove the retaining capscrew, lockwasher,
anti-scalp cup if applicable, blade, blade
adapter, and self-propel components from
the crankshaft. Remove the four capscrews
retaining the engine to the mower chassis
and lift the engine from the mower.
15. To gain access to the components inside the
crankcase remove the four capscrews re-
taining the engine to the mower adapter
plate and remove the adapter plate from the
engine. Remove the six retaining capscrews
holding the two halves of the crankcase
together and separate the crankcase.
16. Remove the crankshaft and piston as an
assembly. Remove the seals, bearing locat-
ing rings, and bearings from each end of the
crankshaft. Slide the governor assembly
from the crankshaft taking care not to lose
the small locating pin for the governor fly-
weight collar.
17. To remove the piston from the connecting
rod use a needle nose pliers and remove one
of the wrist pin retainers. Slide the wrist pin
out of the piston far enough to allow the
piston to be removed from the connecting
rod. The needle bearing may be removed
from the connecting rod, however, there are
no further serviceable parts on the crank-
shaft assembly.
SHAFT IS ASSEMBLED AT THE FACTORY
ING TO DISASSEMBLE THE CRANKSHAFT
FURTHER WILL RESULT IN CRANKSHAFT
DAMAGE.
18. The wrist pin and piston rings may be re-
moved from the piston for replacement. The
top ring is made of cast iron with a chrome
plating on the outside diameter.
IMPORTANT: THE THREE PIECE CRANK-
TO PRECISION TOLERANCES. ATTEMPT-
IMPORTANT: USE CAUTION WHEN RE-
MOVING THE RINGS. OVER-STRETCHING
THE RINGS WILL RESULT IN DIFFICULTY
DURING ENGINE REASSEMBLY.
19. Remove the governor shaft E-ring and flat
washer and slide the governor shaft out of
IV-2