Hummer H3. Manual — part 1657

conditions:

Worn shift fork pads

The roller on the shift fork for wear or damage

Cracked or bent shift fork

Refer to Cleaning and Inspection.

2. Replace the following components if found faulty:

The shift fork pads

The shift fork

Refer to Transfer Case Disassemble and
Transfer Case Assemble.

Range sleeve

1. Inspect the range sleeve for the following conditions:

Engagement teeth for burrs or damage

Sliding freely on the mainshaft

The range sleeve shift fork collar for excessive wear

Refer to Cleaning and Inspection.

2. Replace the range sleeve if it is faulty. Refer to Transfer

Case Disassemble and Transfer Case Assemble.

High/low planetary carrier

1. Inspect the high/low planetary engagement teeth for burrs

or damage. Refer to Cleaning and Inspection.

2. Replace the high/low planetary carrier if it is faulty.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Mainshaft front support
bearing

1. Inspect for the following conditions:

Failed front mainshaft support bearing in the input
gear

Journal on the mainshaft for excessive wear or
damage

Refer to Cleaning and Inspection.

2. Replace the bearing if it is faulty. Refer to Transfer

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

TRANSFER CASE JUMPS OUT OF GEAR

Transfer Case Jumps Out of Gear

Case Disassemble and Transfer Case Assemble.

3. Replace the mainshaft if it is damaged. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Lockup shift collar assembly

1. Inspect the lockup shift collar assembly for the following

conditions:

Shift hub for binding

Shift collar for damage

Burred or damaged engagement teeth

Refer to Cleaning and Inspection.

2. Replace the shift collar assembly if it is faulty. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Drive sprocket

1. Inspect for the following conditions:

Engagement teeth on the drive sprocket for burrs or
damage

Worn bushing in the drive sprocket

Journal on the mainshaft for excessive wear or
damage

Refer to Cleaning and Inspection.

2. Replace the drive gear if it is damaged. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

3. Replace the mainshaft if it is damaged. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Cause

Correction

DEFINITION: Loss of the transfer case drive torque during deceleration, acceleration or
under load.

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

Review the Symptoms - Transfer Case and perform the necessary inspections.
Shift cam worn

1. Inspect for excessive wear on the shift cam, not allowing

full shift fork travel. Refer to Cleaning and Inspection.

2. Replace the faulty shift cam. Refer to Transfer Case

Disassemble and Transfer Case Assemble.

High/low shift fork pads

1. Inspect the shift fork pads for wear. Refer to Cleaning

and Inspection.

2. Replace the fork pads or other damaged components.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Faulty high speed teeth on
range sleeve

1. Inspect for the following conditions:

The input gear high speed engagement teeth for
wear or damage

The engagement teeth on the range sleeve for wear
or damage

Refer to Cleaning and Inspection.

2. Replace the range sleeve if the teeth are faulty. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

3. Replace the high/low planetary carrier assembly if the

input gear engagement teeth are faulty. Refer to
Transfer Case Disassemble and Transfer Case
Assemble.

High/low planetary carrier

1. Inspect the high/low planetary carrier for the following

conditions:

Low speed engagement teeth worn or damaged

Cracked carrier housing

Pinion gear bushings worn or out of position

Pinion gears broken or damaged teeth

Pinion gears seized

Refer to Cleaning and Inspection.

2. Replace the high/low planetary carrier if any of the

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3

above conditions are found. Refer to Transfer Case
Disassemble and Transfer Case Assemble.

Faulty high/low range fork

1. Inspect the high/low range fork for damage or wear.

Refer to Cleaning and Inspection.

2. Replace the high/low range fork if it is faulty. Refer to

Transfer Case Disassemble and Transfer Case
Assemble.

Lockup shift collar assembly

1. Inspect the lockup shift collar assembly for the following

conditions:

Worn or damaged sleeve

Lock up collar teeth worn or damaged

Refer to Cleaning and Inspection.

2. Replace the lockup shift collar assembly if it is faulty.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Planetary differential

1. Inspect the planetary differential for the following

conditions:

Cracked carrier housing

Pinion gear bushings worn or out of position

Pinion gears broken or damaged teeth

Pinion gears seized

Refer to Cleaning and Inspection.

2. Replace the planetary differential if any of the above

conditions are found. Refer to Transfer Case
Disassemble and Transfer Case Assemble.

Mainshaft front support
bearing

1. Inspect the bearing in the input gear and the mainshaft

journal for excessive wear. Refer to Cleaning and
Inspection.

2. Replace the bearing and the mainshaft if they are faulty.

Refer to Transfer Case Disassemble and Transfer
Case Assemble.

Sun gears

1. Inspect the sun gears for broken or damaged teeth. Refer

2007 Hummer H3

2007 TRANSMISSION Transfer Case - BW 4493/4494 - H3