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1.5
Section 1
Safety and General Information
1
Periodic Maintenance Instructions
WARNING: Accidental Starts!
Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or
equipment, disable the engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) battery
cable from battery.
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table. They should also
be included as part of any seasonal tune-up.
1
Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.
2
Have a Kohler Engine Service Dealer perform this service.
3
Cleanout Kits 25 755 20-S (black) or 25 755 21-S (gold) allow cooling areas to be cleaned without removing
shrouds.
Storage
If the engine will be out of service for two months or
more, use the following storage procedure.
1. Clean the exterior surfaces of the engine. On
Electronic Fuel Injected (EFI) engines, avoid
spraying water at the wiring harness or any of the
electrical components.
2. Change the oil and oil filter while the engine is still
warm from operation. See “Change Oil and Oil
Filter” in Section 6.
3. The fuel system must be completely emptied, or
the gasoline must be treated with a stabilizer to
prevent deterioration. If you choose to use a
stabilizer, follow the manufacturer’s
recommendations, and add the correct amount
for the capacity of the fuel system.
Fill the fuel tank with clean, fresh gasoline. Run
the engine for 2 to 3 minutes to get stabilized fuel
into the rest of the system. Close the fuel shut-off
valve when the unit is being stored or transported.
To empty the system, run the engine until the tank
and the system are empty.
4. Remove the spark plugs and add one tablespoon
of engine oil into each spark plug hole. Install the
spark plugs, but do not connect the plug leads.
Crank the engine two or three revolutions.
5. On equipment with an EFI engine, disconnect the
battery or use a battery minder to keep the battery
charged during storage.
6. Store the engine in a clean, dry place.
• Replace fuel filter
1
(EFI engines). Section 5B
Daily or Before
Starting Engine
Maintenance Required Refer to:Frequency
• Fill fuel tank. Section 5
• Check oil level. Section 6
• Check air cleaner for dirty
1
, loose, or damaged parts. Section 4
• Check air intake and cooling areas, clean as necessary
1
. Section 4
• Service precleaner element
1
. Section 4
Every 25 Hours
• Replace air cleaner element
1
. Section 4
• Change oil. (More frequently under severe conditions.) Section 6
• Remove cooling shrouds and clean cooling areas
1,3
. Section 4
• Check oil cooler fins, clean as necessary (if equipped). Section 6
• Check spark plug condition and gap. Section 8
• Change oil filter. Section 6
Annually or
Every 500 Hours
• Have bendix starter drive serviced
2
. Section 8
• Have solenoid shift starter disassembled and cleaned
2
. Section 8
Every 100 Hours
Every 200 Hours
Every 1500 Hours
• Have crankshaft spline lubricated
2
. Section 2
Every 500 Hours
Every 250 Hours
• Replace heavy-duty air cleaner element and check inner element
1
. Section 4