TM-9-2320-387-10 HMMWV Operator Manual Download
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General Information Model ....................................................... New Venture Gear Type .......................................... Two-speed, locking, chain-driven Oil type .............................................. Dexron ® II or Dexron ® III CAUTION Damage to drivetrain will occur if transfer case ranges are not selected properly. Refer to paragraph 2-13 for specific instructions on placing vehicle in motion, and to paragraph 2-40 for operating on unusual terrain. Transfer Case Range Selection Recommended Shift Lever Position Operating Condition H (high range) This drive range shall be selected whenever possible. High range should be used when operating on all primary, secondary, and off- road surfaces, where little or no wheel slippage exists. This range is also to be used when encountering sharp, continuous turns on high traction surfaces. H/L (high/lock range) This drive range shall be selected for off- highway hilly terrain or when continuous wheel slippage is evident; i.e., when operating in mud, snow, loose sand, or on ice, and increased control or additional traction is required. L (low range) This drive range shall be selected only when high ranges do not provide sufficient power to negotiate steep hills or downgrades. This range shall also be used when the vehicle is mired and cannot be extracted using the high/ lock range. N (neutral) Vehicle is disabled and must be towed. Table 1-7. Transfer Case Data. TM 9-2320-387-10 Change 1 1-9