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Four Wheel Drive Diagnosis and Repair

Four Wheel Drive Diagnosis and Repair. Possible Problems. Noise Leaks Shifting problems Engagement problems. Noises. Possible causes Worn chain Worn gears Helical Planetary Worn/faulty bearings. Leaks. Possible causes Case Porosity Gaskets/sealing surfaces Input seal

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Four Wheel Drive Diagnosis and Repair

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  1. Four Wheel Drive Diagnosis and Repair

  2. Possible Problems • Noise • Leaks • Shifting problems • Engagement problems

  3. Noises • Possible causes • Worn chain • Worn gears • Helical • Planetary • Worn/faulty bearings

  4. Leaks • Possible causes • Case • Porosity • Gaskets/sealing surfaces • Input seal • Will cause low transmission fluid level and high transfer case fluid level • Output seals • Front • Rear

  5. Shifting Problems • Possible causes • Worn shift forks • Missing shift fork pads • Worn linkage • Rusty or sticky linkage

  6. Engagement Problems • Transfer case • Jumps out of L4 • Worn range fork • Missing fork pads • Jumps out of L4 and H4 • Worn mode fork • Missing fork pads • Front axle/hubs • Front axle does not engage • Missing vacuum hose • Defective vacuum switch • Defective front axle actuator • Defective automatic hub • Broken manual hub mechanism

  7. Automatic Transfer Case Diagnosis • Refer to factory diagnosis procedures • Some models will display a “Service 4WD” light • Some models will use the transfer case indicator lights to indicate a problem • Lights may also be used to retrieve codes • OBDII – use scan tool

  8. Automatic Transfer Case Wiring

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