TRANSFER CASE 7 TANSFER CASE The lubrication oil flows through holes of the output shaft which in turn lubricate the inner parts of transfer case. 4.3.1.4 WORKING OF TRANSFER CASE Transfer case is a two-speed, part-time electrical shift transfer case. The Transfer case system consists of: 1. Transfer Case with Shift Motor, Speed Sensor and Electric Clutch. 2. Electronic Control Unit (ECU) 3. Mode selector switch on the Floor console and Indicator lights 4H and 4L on the instrument cluster 4. Harness to connect the above parts and power input/output. The power is received by input shaft which is coupled with output shaft of transmission gear box by matching splines. There are two outputs, one for rear wheels and the other for front wheels. Three selector positions are provided. Position Speed Ratio Operation 2H – Two high position 1:1 Two rear wheels are driven at 1:1 speed ratio 4H – Four high position 1:1 All four wheels are driven at 1:1 ration 4L – Four low position 2.48:1 All four wheels are driven at 2.48:1 ratio Planetary gear set provides gear reduction. Power is transferred to the front wheel drive through a chain drive. Transfer case unit operates in an oil bath. An oil pump is used to provide positive lubrication to the planetary gear set and other upper output shaft components MODE OF SHIFTS The different modes are obtained by rotating selector switch for selection. This in turn gives signal to the Electronic Control Unit (ECU), which controls operations intelligently. It senses the conditions and shifts the transfer case as per the selected mode. Inbuilt diagnostic system is provided in the Transfer case ECU for transfer cases electrical components. The control over the operations is obtained by using the Electronic Control Unit (ECU). Different shift modes are; 2H – Two wheel high 4H – Four wheel high 4L – Four wheel low
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