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Service Engine - Page 24
SERVICE ENGINE
Service Engine
Adjusting Carburetor
NOTE: Carburetor is calibrated by the engine
manufacturer and should not require any adjustments.
If engine is operated at altitudes above 1829 m (6,000
ft.), some carburetors may require a special high
altitude main jet. See your John Deere dealer.
Possible engine surging will occur at high rpm with no
load (with transmission in “N” neutral and mower
blade engagement lever disengaged). This is a normal
condition due to the emission control system.
If engine is hard to start or runs rough, check the
Troubleshooting section of this manual.
After performing the checks in the troubleshooting section
and your engine is still not performing correctly, contact
your John Deere dealer.
Avoid Fumes
Engine Oil
NOTE: Air cooled engines run hotter than automobile
engines. The use of multi-viscosity oil such as (10W-
30) in ambient temperatures above 4° C (40° F) will
result in higher than normal oil consumption. If multi-
viscosity oil used, check oil level more frequently to
prevent any possible damage due to lack of lubrication.
Use oil viscosity based on the expected air temperature
range during the period between oil changes.
Use a high quality detergent oil classified as:
• API Service Classification SG
• API Service Classification SF
c CAUTION: Avoid injury. Engine exhaust fumes
can cause sickness or death:
- If it is necessary to run an engine in an
enclosed area, use an exhaust pipe extension
to remove the fumes.
- Always try to work in a well ventilated area.
c CAUTION: Avoid injury. To prevent injury from
accidental starting, always remove wire from
spark plugs and disconnect battery at negative
terminal before servicing engine.