Troy-Bilt 1900678 - Manual (Page 35)

ENGINE AIR CLEANER
The air cleaner must be kept clean and properly in­
stalled at all times. A dirty, clogged filter can cause hard-
starting, stalling, or over-heating problems. An impro­
perly installed or damaged filter can allow unfiltered air
into the engine, resulting in premature engine wear and
damage. Never operate the engine without the air
cleaner installed.
A. Clean the air cleaner after every 25 operating hours,
or sooner under extremely dusty or dirty operating
conditions. To service the air cleaner, refer to the “Oil
Foam” air cleaner instructions in your engine owner’s
pamphlet.
CARBURETOR ADJUSTMENTS
The carburetor provides the engine combustion
chamber with the correct air-fuel ratio for a wide range
of operating conditions. Factory settings should be cor­
rect for average operating conditions — do not make
unnecessary adjustments. If you feel an adjustment is
needed (to compensate for differences in fuel, temper­
ature, altitude or load), refer to the instructions in your
engine owner’s pamphlet.
AIR COOLING SERVICE
Periodically check and clean dirt and grass from the
cylinder head fins, blower housing, rotating screen, and
muffler area. This will result in better engine perfor­
mance. See your engine owner’s pamphlet for detailed
instructions.
OFF-SEASON STORAGE
A. Run the engine until all the gasoline is used up. Do
not store your mower with gasoline in the fuel tank be­
cause gum deposits could form on carburetor parts and
in the fuel lines and tank. After draining the gasoline on
24" models, turn the fuel valve to the OFF position.
B. As an alternative to removing all of the gasoline
from the fuel tank, the use of a fuel additive such as
STA-BIL® or the equivalent will minimize the formation
of gum deposits. Carefully follow the directions provid­
ed by the manufacturer of the fuel additive.
C.
While the engine is stiil warm, drain the engine
crankcase oil according to the procedure in your engine
owner’s pamphlet. Refill with fresh oil.
D. Remove the spark plug and pour one ounce of en­
gine oil into the cylinder. Crank the cylinder slowly to
distribute the oil. Replace the spark plug.
E.
Clean dirt and grass from the cylinder head, fins,
blower housing, rotating screen and muffler areas.
F. Clean the underside of the mower.
G.
Check the condition of the blade and check the
blade for tightness along with the remaining nuts and
bolts on the mower.
H.
Perform the routine lubrication and air cleaner
maintenance.
I. Charge the battery on electric start models and store
the battery in a cool, dry place.
J. Cover the mower and store it in a clean, dry place.
K. Never store the mower with gasoline in the tank in­
side a building where fumes may reach an open flame
or spark.
L.
Remember — this is a good time to order replace­
ment parts for the next mowing season.
SPARK PLUG
The spark plug provides the necessary spark to ignite
the fuel mixture in the engine combustion chamber. It is
essential to proper engine operation to have a plug that
is properly adjusted and in good condition. Clean and
reset, or replace the plug after every 100 hours of oper­
ation. See your engine owner’s pamphlet for servicing
instructions.
THROTTLE CABLE ADJUSTMENTS
An adjustment to the throttle cable may be required if
the engine does not start or stop, or if it does not
respond to various throttle control settings. Refer to your
engine owner’s pamphlet for servicing instructions.
ENGINE SPEEDS
The recommended engine speed settings for the 5HP
and 8HP engines are listed below. These settings will pro­
vide optimum engine and mower performance and will
maintain compliance with the American National Stan­
dards Institute safety standards. If an adjustment is re­
quired, it shouid be done by an engine dealer who is
authorized by the engine manufacturer to perform this
procedure.
5HP Engine;
8HP Engine:
Normal RPM
3400
3500
Maximum RPM
3500
3600
ENGINE NUMBERS
When seeking engine service or parts, you may be
asked for the Model Number, Type Number, and Code
Number of your engine. These numbers can be found
on the engine as shown in Photos 5-29 and 5-30.
Photo 5-29: Identification numbers on 5 HP engine.
Photo 5-30: Identification numbers on 8 HP engine.
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