SAFARI

12 TRANSFER CASE Position Speed Operation Ratio N - Neutral position - (Available only in manual shift type transfer case). The out put shaft is disconnected from the input shaft and no power is transmitted to the wheels 2H - Two high position 1: 1 Only the two rear wheels are driven and the transfer case operates at 1: 1 speed ratio 4H - Four high position 1: 1 All four wheels are driven at 1: 1 speed ratio 4L - Four low position 2.48: 1 All four wheels are driven and the transfer case operates at 2.48: 1 speed reduction ratio A planetary gear set is used to provide gear reduction. Power is transferred to the front wheel drive through a Morse Hi-Vo chain drive. Unit operates in an oil bath. An oil pump is used to provide positive lubrication to the planetary gear set and other upper shaft components. The different modes are obtained by rotating selector switch for selection. This in turn gives signal to Electronic Control Unit (ECU). ECU intelligently controls operations. It senses the conditions and shifts transfer case into the mode selected. The control over the operations is obtained using ‘Electronic Control Unit (ECU)’. It consists of 1. The control unit housed below the driver’s seat or under dashboard 2. Rotary switch provided for selection of different modes l 2H l 4H l 4L 3. The indicator lights on the dashboard to indicate the status (4H-4L) TRANSFER CASEWORKING : Divgi-Warner's 45-54 Transfer case is a two speed, part time electric transfer case. The transfer case operates in a system. The system consists of 1. Transfer case with motor, speed sensor, and electric clutch. 2. Electronic control unit (ECU) 3. Mode selector switch 4. Indicator lights 4H and 4L 5. Harness to connect the above parts and power input. The power is received by input shaft, which is coupled with output shaft of transmission gearbox by matching splines. There are two outputs, one for rear wheels and one for front wheels.