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MAINTENANCE
D-3 D-3
RANGER 8
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Use 4-stroke motor oil that meets or exceeds the
requirements for API service classification SG or SH.
Always check the API SERVICE label on the oil con-
tainer to be sure it includes the letters SG or SH.
SAE 10W-30 is recommended for general, all-tempera-
ture use, -5 F to 104 F (-20 C to 40 C). For the Onan
engine, it is recommended that SAE 30 oil be used
above 82 F (27 C).
See Engine Owner’s Manual for more specific informa-
tion on oil viscosity recommendations.
Wash your hands with soap and water after handling
used oil.
Please dispose of used motor oil in a manner that is
compatible with the environment. We suggest you take
it in a sealed container to your local service station or
recycling center for reclamation.
Do not throw it in the trash, pour it on the ground or
down a drain.
OIL FILTER CHANGE
1. Drain the engine oil.
• Remove the oil filter, and drain the oil into a suitable
container. Discard the used oil filter.
• Clean the filter mounting base, and coat the gasket of
the new oil filter with clean engine oil.
• Screw on the new oil filter by hand, until the gasket
contacts the filter mounting base, then use an oil filter
socket tool to tighten the filter an additional 1/2 to 7/8
turn.
• Refill the crankcase with the specified amount of the
recommended oil. Reinstall the oil filler cap.
• Start the engine and check for oil filter leaks.
• Stop the engine, and check the oil level. If necessary,
add oil to the upper limit mark on the dipstick.
• Air Cleaner - With normal operating conditions, the
maintenance schedule for cleaning and re-oiling
the foam pre-filter is every 25 hours and replace-
ment of the air cleaner filter every 100 hours. More
frequent servicing is required with dusty operating
conditions. Refer to the maintenance section of the
Engine Owner’s Manual for more information.
• Refer to the maintenance section of the Engine
Owner’s Manual for the maintenance schedule,
spark plug servicing, cooling system servicing, and
fuel filter replacement.
• Blow out the machine with low pressure air peri-
odically. In particularly dirty locations, this may be
required once a week.
• Output Ranger Selector and Polarity Switches:
Switch contacts should not be greased. To keep
contacts clean, rotate the switch through its entire
range frequently. Good practice is to turn the handle
from maximum to minimum setting twice each
morning before starting to weld.