4 engine oil, 5 engine fuel system, 4 engine oil 7.5 engine fuel system – Scag Power Equipment STWC61V-25KA-LC User Manual
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Section 7
C. CHANGING ENGINE OIL FILTER
After the first 20 hours of operation, replace the engine 
oil filter. Thereafter, replace the oil filter after every 200 
hours of operation or every month, whichever occurs first. 
Refer to Engine Operator’s Manual for instructions. See 
Figure 7-4.
ENGINE FUEL SYSTEM
7.5
DANGER
To avoid injury from burns, allow the mower 
to cool before removing the fuel tank cap and 
refueling.
A. FILLING THE FUEL TANK
Fill the fuel tank at the beginning of each operating day 
to within one (1) inch below the filler neck. Do not overfill. 
Use clean, fresh unleaded gasoline with a minimum 
octane rating of 87 and a maximum of 10% Ethanol.
DO NOT use E85 Fuel. Using E85 Fuel will cause severe 
damage to the engine.
To avoid personal injury or property damage, use 
extreme care in handling gasoline. Gasoline is extremely 
flammable and the vapors are explosive.
Extinguish all cigarettes, cigars, pipes and other
1.
sources of ignition.
Use only an approved gasoline container.
2.
Never remove the gas cap or add fuel with the
3.
engine running. Allow the engine to completely cool 
before fueling.
Never fuel the machine indoors or in an enclosed
4.
trailer.
Never store the machine or fuel container where
5.
there is an open flame, spark or pilot light such as on 
a water heater or other appliances.
Never fill containers inside a vehicle or on a truck
6.
or trailer bed with a plastic liner. Always place 
containers on the ground away from your vehicle 
before filling.
C. CHANGING HYDRAULIC OIL FILTER 
ELEMENT
The hydraulic oil filter should be changed after every 500 
hours of operation or annually, whichever occurs first.
Remove the oil filter element and properly discard it.
1.
See Figure 7-3. Fill the new filter with clean oil and 
install the filter. Hand tighten only.
Run the engine at idle speed with the speed control
2.
lever in neutral for five minutes.
Check the oil level in the hydraulic tank. It must
3.
be 3-1/4" inches from the top of the filler neck. If 
necessary, add SAE 20W50 motor oil.
ENGINE OIL
7.4
ENGINE OIL
FILLER
ENGINE OIL
FILTER
ENGINE OIL
DRAIN PLUG
engine Oil Fill/Dipstick, Filter and Drain
Figure 7-4.
Locations
A. CHECKING ENGINE CRANKCASE OIL LEvEL
The engine oil level should be checked after every 8 hours 
of operation or daily as instructed in the Engine Operator’s 
Manual furnished with this mower.
B. CHANGING ENGINE CRANKCASE OIL
After the first 20 hours of operation, change the engine 
crankcase oil and replace the oil filter. Thereafter, 
change the engine crankcase oil after every 100 hours 
of operation or bi-weekly, whichever occurs first. Refer to 
the Engine Operator’s Manual furnished with this mower 
for instructions.
