Hummer H3. Manual — part 973

Fig. 105: Identifying High Flank Contact Pattern
Courtesy of GENERAL MOTORS CORP.

Condition

The pinion depth is incorrect. The pinion gear is too far away from the ring gear.

Correction

Increase the pinion depth. Move the pinion gear closer to the ring gear by increasing the pinion
shim thickness. Refer to Pinion Depth Adjustment.

Low Flank Contact Pattern

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Fig. 106: Identifying Low Flank Contact Pattern
Courtesy of GENERAL MOTORS CORP.

Condition

The pinion depth is incorrect. The pinion gear is too close to the ring gear.

Correction

Decrease the pinion depth. Move the pinion gear away from the ring gear by decreasing the
pinion shim thickness. Refer to Pinion Depth Adjustment.

DESCRIPTION AND OPERATION

FRONT DRIVE AXLE DESCRIPTION AND OPERATION

The Front Drive Axle consist of the following components:

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

Differential Carrier Housing

Differential Assembly

Intermediate Shaft

Intermediate Shaft Housing

Electric Motor Actuator

Shift Fork/Clutch Assembly

The front axle on four wheel drive model vehicles has a central disconnect feature. The axle uses
a conventional ring and pinion gear set in order to transmit the driving force of the engine to the
wheels. The open differential allows the wheels to turn at different rates of speed while the axle
continues to transmit the driving force. This prevents tire scuffing when going around corners and
premature wear on internal axle parts. The ring and pinion set and the differential are contained
within the carrier. The axle identification number on top of the differential carrier assembly or on
a label on the right half of differential carrier assembly. The drive axles are completely flexible
assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic
boots and connected by a wheel drive shaft.

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Special Tools

Illustration

Tool Number/Description

J 5590

Pinion Bearing Race Installer - Rear

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3

J 7817

Outer Bearing Race Installer

J 8001

Dial Indicator Set

J 8092

Driver Handle

2007 Hummer H3

2007 Driveline/Axle Front Drive Axle - H3