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2. BASIC MAINTENANCE
[1] OIL HANDLING
• Oil is used under extremely harsh conditions (high temperature, high pressure) in the engine and working
device, which causes the oil to undergo deterioration with operating time.
Always use oil that meets requirements such as grade and operating temperature defined in the operation
manual. Be sure to perform periodic replacement of oil irrespective of contamination in the oil.
• Oil is equivalent to human blood. Exercise due caution to handle oil, keeping impurities (such as water, metal
powder or dust) out of oil. Most of mechanical failures are attributed to intrusion of impurities.
Extra caution is required to prevent impurities from finding their way during machine storage and lubrication.
• Do not mix oil with other oil of different grade or brand.
• Oil lubrication must conform to the designated quantity of oil.
Failure to lubricate at adequate quantity can lead to a machine failure.
• In the event that oil used in the working device turns cloudy, potential intrusion of moisture or air into the oil
may be considered.
Contact us or our sales service agency.
• When replacing oil, always replace the relevant filter as well.
•”ISO VG32” is adopted for a hydraulic oil system as factory default.
Do not use any other hydraulic oil that is not recommended by us. Failure to follow the instruction may cause
the filters to get clogged. A minute amount of oil remaining in piping and cylinders does not cause problems
even if mixed with other oil.
[2] FUEL HANDLING
• The fuel pump is precision equipment that becomes inoperative if fuel containing moisture or impurities is
used. Extra caution is required to prevent impurities from finding their way during machine storage and
lubrication.
• Do not remove the strainer when replenishing fuel.
• Always use fuel that meets requirements such as grade and operating temperature defined in the operation
manual.
• Ensure that the fuel tank is filled up after finishing daily work to prevent condensation of the humid air inside
the fuel tank that will result in intrusion of moisture.
• Drain deposits and water out of the fuel tank before starting the engine or approximately 10 minutes after fuel
replenishment.
• The air should be released from the circuit when the machine runs out of fuel or fuel filter replacement is
performed.
• Clean the tank and fuel system if any foreign objects enter the fuel tank.
[3] STOCKING AND STORAGE OF OIL AND FUEL
• Stock and store oil and fuel indoors to keep impurities such as moisture or dust out of them.
• When storing oil and fuel in drums for a long time, line the drums horizontally aligning the drum bungs
sideways (to store them away from moisture). Be sure to cover the drums with a waterproof sheet if storing
them outside.
• To prevent deterioration of oil and fuel resulted from long-term storage, employ the first-in first-out for using oil
and fuel.
[4] GREASE HANDLING
• Grease is designed to prevent the joint from rattling and making noise.
• A nipple that is not described in the Periodic Maintenance chapter is used for overhauls, which requires no
grease replenishment. Grease the nipple if a long-term use hinders its smoothness.
• Wipe off old grease squeezed out after greasing. Extra care is required to wipe a part that the adhesion of
sands and dust accelerates the wearing away of the rotating part.
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