SsangYong Rodius (2013 year). Service manual - part 152

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3. SYSTEM LAYOUT

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4. IWE LOCKING HUB SYSTEM

1) Overview

The vacuum locking hub uses the IWE (Integrated Wheel End) system, and in this system, the

vacuum is generated only within the hub actuator.

It is structured to transmit power to the front section after the actuator hub is engaged following

the release of vacuum from the drive shaft end gear and the hub end gear.

Booster

Vacuum pump

Vacuum generation process in front hub actuator

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(2) Vacuum System Related to 4WD

In 4WD mode, the TCCU blocks the

transferring of vacuum pressure from

vacuum pump to locking hub by supplying

the power to solenoid valve.

Check valve

This valve allows the vacuum pressure to 

flow through it in only one direction. This 

prevent the vacuum from abruptly

releasing due to faulty vacuum pump.

4WD:

The vacuum pressure is released from the hub 

actuator. At this time, the front hub end gear is 

engaged.

2WD:

The vacuum pressure pulls in the locking hub 

actuator so that it will not be engaged with the 

front end hub gear.

Vacuum solenoid valve

To atmosphere

Block the vacuum 

pressure

Hub actuator (RH)

Gear disengaged

Gear engaged

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5. POWER FLOW

Switching 2H, 4H → 4L

TCCU

Vacuum solenoid

Locking hub operation

(Released internal vacuum)

Front propeller shaft

Front axle

Front wheel

Rear propeller shaft

Rear axle

Rear wheel

Transfer case