Engine oil and filter
Locate the engine oil dipstick. Pull the dipstick out, wipe it with a clean wiper, and reinsert it fully
into the dipstick tube. Remove the dipstick and check the oil level.
It is normal to add some oil between oil changes. Keep the oil level between the High and Low
mark on the dipstick by adding oil as required. Do not overfill. Use the correct oil as specified
under lubricant specification.
It is recommended to:
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Drain and replace the engine crankcase oil initial 50 hours and every 500 operating hours
(Depending on application).
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Remove the oil pan drain plug to drain old oil after the truck has been in operation and the engine
(oil) is operating temperature.
Engine oil at operating temperature is hot and can cause burns. Beware of splashing oil.
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Carefully check for leaks after changing oil and installing a new filter.
The time interval for changing engine oil depends upon your application and operating
conditions. To determine the correct schedule for your truck, it is suggested that you
periodically submit engine oil samples to a commercial laboratory for analysis of the
condition of the oil.
OIL PERFORMANCE DESIGNATION: To help achieve proper engine performance and
durability, use only engine lubricating oils of the proper quality. For the diesel engines, HYUNDAI
recommends that you use motor oil that meets API service classification API CJ-4 or better (SAE
15W-40) for the diesel engines.
Hydraulic sump tank
Check the hydraulic sump tank fluid level. Correct fluid level is important for proper system operation.
Low fluid level can cause pump damage. Over filling can cause loss of fluid or lift system malfunction.
Hydraulic fluid expands as its temperature rises. Therefore, it is preferable to check the fluid level at
operating temperature (after approximately 30 minutes of truck operation). To check the fluid level,
first park the truck on a level surface and apply the parking brake.
Put the mast in a vertical position and lower the fork carriage fully down. Pull the dipstick out,
(attached to the sump breather) wipe it with a clean wiper, and reinsert it. Remove the dipstick and
check the oil level. Keep the oil level above the LOW mark on the dipstick by adding recommended
hydraulic fluid only, as required. Do not overfill.
Check the condition of the hydraulic fluid (age, color or clarity, contamination). Change the oil as
necessary.
Hydraulic fluid and filter change
Drain and change the hydraulic sump fluid every 1000 operating hours. (Severe service or
adverse conditions may require more frequent fluid change). Replace the hydraulic oil filter
element at every oil change. Remove, clean, and reinstall the hydraulic and steer system suction
line screens at first PM and every 500 hours thereafter. Check for leaks after installation of the
filter. Also, check that the hydraulic line connections at the filter adapter are tightened correctly.
The procedure for draining hydraulic sump tank is in your service manual.
Sump tank breather maintenance and inspection
Remove the sump tank fill cap/breather and inspect for excessive (obvious) contamination and
damage. Replace the fill cap/breather, per recommended PM schedule or as required by
operating conditions.
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