SE-04753
[Operation Manual]
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DAIKIN INDUSTRIES, LTD.
[12. Maintenance]
To keep the motor pump performance in good conditions for a long period, conduct periodic maintenance on the
following items. If there is a problem, repair or replace defective parts.
Standard inspection cycles are listed below. However, these cycles considerably vary depending on the operating
conditions and environment.
Periodic inspection
Item
Inspection cycle
Method
Oil tank
Oil level check
Daily, Occasionally Make sure that the float of the oil level gauge is between the red and
yellow lines. Check the hydraulic oil for whitish muddiness and air
bubbles.
Oil temperature check Daily, Occasionally Make sure that the oil temperature is 60 C or less.
(Normally, use the oil at 15 to 50 C.)
Oil color check
Semiannually
Deterioration of hydraulic oil can be checked by color. If the
hydraulic oil turns brownish (ASTM L4 level: bright yellow),
replace it.
Oil cooler
Fan motor rotation
Daily, Occasionally Make sure that the fan motor is rotating.
Clogging of the core
Semiannually
Visually check the core for clogging.
If the fan motor rotation is stopped, or the core is clogged,
[1] the oil cooler cooling capacity remarkably deteriorates. This
causes the hydraulic oil or the unit to become hot, resulting in
burns. Also, this accelerates deterioration of the hydraulic oil,
causing the unit service life to be shortened.
[2] the motor becomes hot, causing the motor service life to be
shortened.
[3] the controller heat radiation performance deteriorates,
causing the electric component service life to be shortened.
The fan motor serves to cool the motor and the controller, as well as
hydraulic oil.
Pressure display
Operation check
Daily, Occasionally Check if the indicated value changes according to load condition
changes.
Pressure display check Daily, Occasionally Make sure that the pressure display for D.H. conforms to the preset
value.
Sound and vibration
Daily, Occasionally Check for abnormal sound and vibration.
Electric wiring
Semiannually
[1] Check the cable sheathing for cracks or fracture.
[2] Measure the insulation resistance, and check for a decrease in
insulation resistance.
[3] Make sure that the ground cable is securely connected.
Hose
Yearly
Check the hose for cracks, fracture or flaws.
Screws and pipes
Daily, Occasionally Check screws and pipes for looseness and oil leak.
