Daikin Hydraulic Unit EHU2507-40

• Wear protective glasses and gloves for this work, and do it with the power OFF.

• When using air blow, take care to avoid getting foreign matter in your eyes.

• Note that oil will flow out from the piping during disassembly. Also, check that there is no residual pressure in the piping before starting the work.

• When the hydraulic oil in cylinders and piping is returned to the tank, the tank may overflow. Rather than returning the hydraulic oil in cylinders to the tank, collect it in a separate oil receiver.

• Check that there is no abnormal noise, abnormal vibration, or abnormal heat generation from this product.

1. Check that the motor cooling fan is rotating and check for dust accumulation.

2. Accumulation of a large amount of dust will lessen the cooling effect, so it should be cleaned.

3. Check if the ambient temperature is too high.

• Before starting maintenance work, stop the unit running and shut off the source power supply.

• Wear protective glasses and gloves for this work.

i) The cooler fins are sharp, so take care.

ii) When using air blow, take care to avoid getting foreign matter in your eyes.

• Take care to ensure that no excessive forces are applied to the power cable or connector of the DC fan during the work.

• Note that oil will flow out from the piping and oil cooler during disassembly.

• Turn the cap in the counterclockwise direction by hand and remove it.

• Air blow the filter section to blow off deposits and adhering material. Also remove dirt from inside the strainer’s cylinder.

• Fit the cap by turning in the clockwise direction by hand to the position where it stops.

WARNING! When using air blow, wear protective glasses to avoid getting deposits and dirt in your eyes.;

1. Set a drain oil receiver below the oil drainage port, open the oil drain plug (M12 × 20L), and drain out all of the hydraulic oil in the tank.

2. Remove the four hexagonal bolts (M8 × 20L) securing the top plate and tank, and hoist the motor by its suspension plates to separate it from the tank.

3. This will reveal the suction strainer: loosen it with e.g. an adjustable wrench and remove it.

• Air blow the filter section to blow off deposits and adhering material. Also remove dirt from inside the strainer’s cylinder.

• After completing the cleaning, reassemble by following the removal procedure in reverse. The tightening torque for the hexagonal bolts that secure the top plate and tank is 5.9 N⋅m. After completing reassembly, check that the unit runs normally by following the test run instructions.

WARNING! When using air blow, wear protective glasses to avoid getting deposits and dirt in your eyes.;

• Wear protective glasses and gloves for this work, and do it with the power OFF.

• When using air blow, take care to avoid getting foreign matter in your eyes.

• Note that oil will flow out from the piping during disassembly. Also, check that there is no residual pressure in the piping before starting the work.

• When the hydraulic oil in cylinders and piping is returned to the tank, the tank may overflow. Rather than returning the hydraulic oil in cylinders to the tank, collect it in a separate oil receiver.

• Check that there is no abnormal noise, abnormal vibration, or abnormal heat generation from this product.

1. Oil hue check. Degradation of the hydraulic oil can be recognized based on its color. If the hydraulic oil color changes toward brown and reaches ASTM level L4: bright yellow, replace it.

2. Check that there are no cracks or breaks in the sheathing of the wiring.

3. Measure the insulation resistance, and check that it has not dropped.