Hummer H3. Manual — part 1656

the rear output shaft

Worn rear output shaft splines

2. Repair or replace the following components, if faulty.

Replace the slip yoke, if required. Refer to Rear
Propeller Shaft Replacement .

Replace the rear output shaft, if required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.

Excessive clearance
between the slip yoke and
the rear bushing

1. Inspect for the following conditions:

Worn rear bushing

Worn slip yoke bushing journal

2. Repair or replace the following components, if faulty.

Replace the slip yoke, if required. Refer to Rear
Propeller Shaft Replacement .

Replace the rear case half if the rear bushing is
worn. Refer to Transfer Case Disassemble and
Transfer Case Assemble.

Worn high speed teeth on
the range sleeve

1. Inspect for the following conditions:

Worn high speed teeth on the range sleeve

Worn or missing input gear thrust washers

Refer to Cleaning and Inspection.

2. Repair or replace the following components, if faulty.

Replace the range sleeve if it is worn. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.

Replace the thrust washers, as required. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.

Worn or faulty planetary
differential

1. Inspect the planetary differential for the following

conditions:

Loose planetary differential splines to the mainshaft
splines

Loose or faulty pinion gears

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Refer to Cleaning and Inspection.

2. Replace the planetary differential assembly if it is faulty.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Worn or missing rear output
shaft thrust washers

1. Inspect to ensure the thrust washers are installed.

2. Inspect the thrust washers and mating surface for

excessive wear.

3. Replace the worn or missing thrust washer. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Worn or damaged rear sun
gear

1. Inspect the sun gear external gear teeth for excessive

wear.

2. Inspect the sun gear to rear output shaft for excessive

looseness.

3. Replace the sun gear or rear output shaft if it is worn.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Worn or damaged front sun
gear

1. Inspect the sun gear external gear teeth for excessive

wear.

2. Inspect the sun gear to drive gear teeth for excessive

wear.

3. Replace the sun gear or drive gear if it is worn. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Rear output shaft bearing
outer retaining ring

1. Inspect for the following conditions:

Proper installation of the rear output shaft bearing
retaining ring

Excessive wear or damaged retaining ring groove in
the rear case half

2. Repair or replace the following components if found

faulty:

Properly install a new rear output shaft bearing
outer retaining ring.

Replace the rear case half if the retaining ring

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

TRANSFER CASE SHUDDER OR BINDING

Transfer Case Shudder or Binding

groove is excessively worn.

Refer to Transfer Case Disassemble and
Transfer Case Assemble.

Cause

Correction

DEFINITION: A shudder, binding or a crow-hop while turning, which may cause tire
scuffing.
Review the Symptoms - Transfer Case and perform the necessary inspections.

Intermittent shift lock up
engagement

1. Shift the vehicle into 4LO Lock or 4HI Lock.

2. Shift the vehicle from 4LO Lock or 4HI Lock to the 4HI

mode.

3. Drive the vehicle and inspect for the shift lock up staying

engaged after shifting from the 4LO Lock or 4HI Lock
to the 4HI Mode. If the shift lock up stays engaged after
shifting from 4LO Lock or 4HI Lock, it will give a
symptom of both axles driving without any speed
difference between the axles. It is noticed by tire scuffing
on dry pavement when turning.

4. Drive the vehicle in reverse for a few feet.

5. Drive the vehicle forward and inspect for the shift lock

up staying engaged. If the shift lock up disengaged after
driving the vehicle in reverse this is normal and no
further action is required.

6. Advise the customer to drive the vehicle in reverse for a

few feet if the shift lock up does not disengage after
shifting out of 4LO Lock or 4HI Lock.

Planetary differential

1. Inspect the planetary differential pinion gears for the

following conditions:

Chipped, bent or deformed teeth

Pinion gear bushings worn

Pinion gear thrust washers missing

Seized or binding pinion gears

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

TRANSFER CASE WILL NOT SHIFT

Transfer Case Will Not Shift

Refer to Cleaning and Inspection.

2. Inspect the planetary differential for deformation. Refer

to Cleaning and Inspection.

3. Replace the planetary differential assembly if it is faulty.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Thrust washer

1. Inspect the thrust washer for seizure to the planetary

differential.

2. Replace the thrust washer if it is faulty and the mating

component if it is damaged. Refer to Transfer Case
Disassemble and Transfer Case Assemble.

Planetary differential not
timed properly

1. Inspect the planetary differential for being timed

properly. Refer to Transfer Case Assemble.

2. Properly time the planetary differential gears. Refer to

Transfer Case Assemble.

Cause

Correction

DEFINITION: While shifting from HI range to LO range, there is gear clashing, no HI
range or the transfer case will not shift from 4HI to 4HI Lock.
Review the

Symptoms - Transfer Case

and perform the necessary inspections.

Shift cam and shaft
assembly

1. Inspect for the following conditions:

The shift cam for being worn

The shift shaft torsion spring for being faulty

Refer to Cleaning and Inspection.

2. Replace the following components if found faulty:

The shift cam

The shift shaft torsion spring

Refer to Transfer Case Disassemble and
Transfer Case Assemble.

High/low range shift fork

1. Inspect the high low shift fork for the following

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3