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Mulching
Model 1515 & 1517 lawn tractors come equipped with a
mulch kit which incorporates special blades, already
standard on your tractor, in a process of recirculating
grass clippings repeatedly beneath the cutting deck.
The ultra-fine clippings are then forced back into the
lawn where they act as a natural fertilizer. Observe the
following points for the best results when mulching.
• Never attempt to mulch if the lawn is damp. Wet
grass tends to stick to the underside of the cutting
deck preventing proper mulching of the clippings.
• Do NOT attempt to mulch more than 1/3 the total
height of the grass or approximately 1-1/2 inches.
Doing so will cause the clippings to clump up
beneath the deck and not be mulched effectively.
• Maintain a slow ground speed to allow the grass
clippings more time to effectively be mulched.
• Always position the throttle control lever in the
FAST (rabbit) position and allow it to remain there
while mowing. Failing to keep the engine at full
throttle places strain on the tractor’s engine and
does not allow the blades to properly mulch grass.
NOTE: It is not necessary to remove the discharge
chute to operate the mower with the mulch kit installed.
Figure 11
To operate the cutting deck without mulching, simply
remove the mulch plug by unthreading the plastic wing
nut which fastens it to the cutting deck. This will allow
the clippings to discharge out the side. See Figure 11.
SECTION 6: MAKING ADJUSTMENTS
WARNING: Never attempt to make any
adjustments while the engine is running,
except where specified in the operator’s
manual.
WARNING: Disconnect the spark plug
wire(s) and ground against the engine before
performing any adjustments, repairs or
maintenance.
Carburetor
NOTE: Carburetor adjustments should be made only
after the engine has warmed up.
The engines on Cub Cadet 1515 & 1517 are equipped
with a Walbro fixed main jet carburetor.
Walbro carburetors have a low idle speed screw and a
low idle fuel adjusting needle.
The carburetor is designed to deliver the correct fuel-to-
air mixture to the engine under all operating conditions.
The main fuel jet is calibrated at the factory and is not
adjustable. The low idle fuel adjusting needle is also set
at the factory and normally does not need adjustment.
If the engine is hard to start, runs roughly, or stalls at
low idle speed, it may be necessary to adjust or service
the carburetor.
Turning the low idle adjusting needle in (clockwise)
decreases the supply of fuel to the carburetor. This
gives a leaner fuel-to-air mixture. Turning the adjusting
needle out (counterclockwise) increases the supply of
fuel to the carburetor. This gives a richer fuel-to-air
mixture. Setting the needle midway between the lean
and rich position will usually give the best results.
Figure 12
Carriage Screw
Plastic Wing Nut
Bell
Washer
Mulch Plug
Low Idle
Fuel Adjustment Needle
Low Idle
Speed Adjustment Screw