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Transmission and transfer case » NV231 transfer case
Diagnosis and testing

NV231 DIAGNOSIS

DIAGNOSIS CHART

Condition

Possible Cause

Correction

Transfer case difficult to shift or will not shift into desired range.
  1. Vehicle speed to great to permit shifting.
  2.  If vehicle was operated for an extended period in 4H mode on dry surface, driveline torque load may cause difficulty.
  3.  Transfer case shift linkage binding.
  4.  Insufficient or incorrect lubricant.
  5.  Internal transfer case components binding, worn, or damaged.
  1.  Slow vehicle and shift into desired range.
  2.  Stop vehicle and shift transfer case to Neutral position. Transfer case can then be shifted to the desired mode.
  3.  Repair or replace linkage as necessary.
  4. Drain and refill transfer case with the correct type and quantity of lubricant.
  5.  Repair or replace components as necessary.
Transfer case noisy in all drive modes.
  1. Insufficient or incorrect lubricant.
  1.  Drain and refill transfer case with the correct type and quantity of lubricant.
Transfer case noisy while in, or jumps out of, 4L mode.
  1. Transfer case not completely engaged in 4L position.
  2.  Transfer case shift linkage out of adjustment.
  3.  Transfer case shift linkage loose or binding.
  4.  Range fork damaged, inserts worn, or fork is binding on the shift rail.
  5.  Low range gear worn or damaged.
  1.  Slow vehicle, shift transfer case to the Neutral position, and then shift into the 4L mode.
  2.  Adjust linkage as necessary.
  3.  Repair, replace, or tighten linkage components as necessary.
  4.  Repair or replace components as necessary.
  5.  Repair or replace components as necessary.
Lubricant leaking from transfer case seals or vent.
  1. Transfer case overfilled.
  2.  Transfer case vent closed or restricted.
  3.  Transfer case seals damaged or installed incorrectly.
  1.  Drain lubricant to the correct level.
  2.  Clean or replace vent as necessary.
  3.  Replace suspect seal.
Abnormal tire wear.
  1. Extended operation in 4H mode on dry surfaces,
  1. Operate vehicle in 2H mode on dry surfaces.
    More about «NV231 transfer case»:

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