Hyundai Tucson Owners & Service Manuals

Hyundai Tucson: Coupling Assembly / Oil hydraulic Motor(Actuator)

- Description The 4WD ECM controls the Pump Motor Pump (Actuator) to generating an oil pressure. The pressure engages a multiple disk clutch to transfer torque to the rear wheels. The torque to the rear wheels varies according to the pressure on the clutch.

- Circuit Diagram

- Inspection

   

• If you have trouble code related to the oil hydraulic motor (actuator), check oil hydraulic motor (actuator) according to the inspection process.

Oil Hydraulic Motor (Actuator) Inspection Procedure

- Removal

   

• Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points")

1.Remove the coupling assembly.(Refer to 4 Wheel Drive (4WD) System - "Direct Electro Hydraulic Actuator Coupling")

2.Keep going perpendicular state after remove the coupling assembly.

   

• Keep going perpendicular state during remove (install) the hydraulic motor (actuators).

• Use a tool (A) that allows the auxiliary operator to hold or seat the coupling in a vertical position.

• So that the input shaft side (B) is not damaged.

3.Remove the hydraulic motor (A) after loosening bolts with hex wrench.

   

• Remove the hydraulic motor (actuators) after dropping residual oil as much as possible inside the coupling. (abut 5-10 sec)

- Installation

1.Before installation, wipe the surface with a clean cloth.

2.Check the O-rings (A) of the new hydraulic motor (actuators).

   

• You have to prevent any dust from entering inside hydraulic motors (actuators) and housing.

3.Tighten the bolts after install the hydraulic motor.

   

• When installing, motor connector (A) has to toward in the direction of outside of the coupling.

Tightening torque:9.8 - 11.7 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.6 lb·ft)

   

• When installing, oil can be reflux by the pressure in air breather hole (A).

• Change direction in the direction of the arrow and lay on the floor as shown in the illustration. ※ The reflux oil will flow to the bottom.

• You have to prevent additional backflow in according to order as shown in the illustration.

4.Wipe the flowed oil to around the surface with a clean cloth.

5.Install the coupling assembly.(Refer to 4 Wheel Drive (4WD) System - "Direct Electro Hydraulic Actuator Coupling")

    Direct Electro Hydraulic Actuator Coupling
    - Description 4WD ECU processes signals from various sensors and determines the current road and driving conditions. The ECU then utilizes this information to implement precision control over ...

    Pressure Sensor
    - Description The 4WD ECU makes a Motor Pump(Actuator) turn round for generating an oil pressure. And then it presses a multiple disk clutch and transfers the generated torque into rear wheels. ...

    Other information:

    Hyundai Tucson (NX4) 2022-2025 Service Manual: Specifications
    - Specifications Tightening Torques ItemsN.mKgf.mlb-ft Transfer assembly mounting bolts60.8 - 65.76.2 - 6.744.8 - 48.5 4WD ECM mounting nuts9.8 - 11.81.0 - 1.27.2 - 8.7 Coupling assembly mounting bolts56.9 - 64.75.8 - 6.642.0 - 47.7 Propeller shaft mounting bolts49.0 - 68.65.0 - 7.036.2 - 5 ...

    Hyundai Tucson (NX4) 2022-2025 Service Manual: Rear Wiper Motor
    - Removal 1.Disconnect the negative (-) battery terminal. 2.Loosen the mounting nut and remove the rear wiper arm & blade (A).     • Take care not to damage the rear glass when removing the rear wiper arms & blades. 3.Remove the liftlgate trim.(Refer to Body - " ...

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