Hyundai Kona: Coupling Assembly / Direct Electro Hydraulic Actuator Coupling Repair procedures

Hyundai Kona (OS) 2018-2021 Service Manual / 4 Wheel Drive (4WD) System / Coupling Assembly / Direct Electro Hydraulic Actuator Coupling Repair procedures

Inspection
  
All units are filled up with coupling fluid (ultra-low viscosity ATF) prior to shipping. Inspection, fill-up, and replacement of coupling fluid is therefore not necessary (zero maintenance, lifetime fluid).
Removal
1.
Remove the 4WD coupling assembly bolts (A-3ea) mounted to the rear propeller shaft (B).
Tightening torque :
49.0 - 63.7 N.m (5.0 - 6.5 kgf.m, 36.1 - 47.0 lb-ft)

2.
Using a flat tool, separate the propellar shaft from 4WD coupling assembly.
3.
Disconnect the pressure sensor connector (A) and Oil hydraulic motor connector (B).

4.
Loosen the coupling assembly mounting bolts (A-4ea).
5.
Separate the 4WD coupling assembly (B) from the rear differential assembly using a rigid rod.
Tightening torque :
58.8 - 63.7 N.m (6.0 - 6.5kgf.m, 43.3 - 47.0lb-ft)

  
Coupling Maintenance Precautions
Maintain the coupling at a horizontal level.
Refer to the handling caution level (A) when servicing the coupling (removal, installation, replacement, etc.).

Always maintain a horizontal posture.

Installation
1.
To install, reverse the removal procedure.
  
Smear the splines (A) with molybdenum type high pressure grease.
When install the coupling, be careful not to damage the oil seal (B).

2.
After replacing the coupling, reset the 4WD ECU's clutch learing using the GDS tool.
(Refer to 4WD Control System - "Repair procedure")
Direct Electro Hydraulic Actuator Coupling Description and operation
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 ...

Oil hydraulic Motor(Actuator) Description and operation
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. ...

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