Nakayama PM4810, Manual

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10
Engine Maintenance
Check Engine Oil Level (Picture J)
Check the engine oil level with the engine stopped and the mower.
• Remove the oil filler cap, and wipe the dipstick clean.
• Insert the dipstick into the oil filler neck, but do not screw it in.
• Check the oil level shown on the dipstick. If near the lower, fill to the upper level with the oil. Do not overfill.
• Screw in the filler cap securely.
Notice: Running the engine with a low oil level will cause engine damage.
Change Engine Oil
• Drain the used oil while the engine is warm. Warm oil drains quickly and completely.
• Wipe the oil filler area clean, then remove the oil filler cap/dipstick.
• Place a suitable container next to the mower to catch the used oil, then tilt the mower on its right side. The used oil will drain through the filler neck. Allow
the oil to drain completely.
• Please dispose of used motor oil and the containers in a manner that is compatible with the environment. We suggest you take it in a sealed container to
your local recycling center or service station for reclamation. Do not throw it in the trash, pour it on the ground, or pour it down a drain.
• Fill with the recommended oil. Do not overfill. Allow a couple of minutes for the oil to settle down in the engine, then measure the oil level.
* Some models are equipped with an oil drain bolt; Untighten and remove the oil drain bolt and let the oil drain in the container. Make sure to tighten se -
curely the drain bolt and add the sealing washer (if included before adding oil).
Air Cleaner Service (Picture T)
Notice: Operating the engine without an air cleaner, or with a damaged air cleaner, will allow dirt to enter the engine, causing rapid engine wear.
• Press down on the cover tabs and remove the cover.
• Remove the filter from the air cleaner base.
• Inspect the filter and foam element, and replace it if damaged.
• Clean the filter by tapping it several times on a hard surface to remove dirt, or blow compressed air through the air filter from the inside. Never try to brush
off dirt; brushing will force dirt into the fibbers.
• Wipe dirt from the inside of the air cleaner base and cover, using a moist rag. Be careful to prevent dirt from entering the air duct that leads to the carbu-
rettor.
• Reinstall the filter and cover.
Spark Plug Service (Picture U - U1 - U2)
For good performance, the spark plug must be properly gapped and free of deposits.
• Disconnect the spark plug cap and remove any dirt from around the spark plug area.
• Remove the spark plug with a spark plug wrench.
• Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator is cracked or chipped.
• Measure the spark plug electrode gap with a suitable gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8mm). Correct the gap, if necessary, by carefully
bending the side electrode with a suitable tool.
• Install the spark plug carefully, by hand, to avoid cross-threading.
• Install the spark plug cap on the spark plug.
NOTICE: A loose spark plug can overheat and damage the engine. Over tightening the spark plug can damage the threads in the cylinder head.
Cable Adjustment (Picture V)
Before the machine is being used, the cable adjustment should always be checked.
The cables can be checked by activating the handles fully and check if the cable is tight. If not, it must be tightened. If the handle cannot easily be fully acti -
vated, the cable should be loosened.
After first season, it must be expected that the cables need to be adjusted for optimal activation, as cables can stretch when used.
The following cables may be necessary to readjust:
1. Cable for drive
2. Cable for engine brake
3. Cable for throttle cable