Hummer H3. Manual — part 723

Fig. 3: View Of Torque Converter Hub In Engine Crankshaft
Courtesy of GENERAL MOTORS CORP.

3. Align the torque converter hub (2) in the engine crankshaft (3) and install the torque

converter to flywheel bolts.

4. Lower the vehicle.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

5. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the

vibration. Refer to Noise and Vibration Analysis.

Repeat this procedure until you obtain the best possible balance.

6. Install the transmission converter cover bolts and the cover.

NOISE AND VIBRATION ANALYSIS

A noise or vibration that is noticeable when the vehicle is in motion MAY NOT be the result of
the transmission.

If noise or vibration is noticeable in PARK and NEUTRAL with the engine at idle, but is less
noticeable as RPM increases, the cause may be from poor engine performance.

Vibration may also be caused by a small amount of water inside the converter.

Inspect the tires for the following conditions:

Uneven wear

Imbalance

Mixed sizes

Mixed radial and bias ply

Inspect the suspension components for the following conditions:

Alignment wear or damage

Loose fasteners

Driveline damage or wear

Inspect the engine and transmission mounts for damage and loose bolts.

Inspect the transmission case mounting holes for the following conditions:

Missing bolts, nuts and studs

Stripped threads

Cracks

Inspect the flywheel for the following conditions:

Missing or loose bolts

Cracks

Imbalance

Inspect the torque converter for the following conditions:

Missing or loose bolts or lugs

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

Missing or loose balance weights

Imbalance caused by heat distortion or fluid contamination

CLUTCH PLATE DIAGNOSIS

Composition Plates

Dry the plates and inspect the plates for the following conditions:

Pitting

Flaking

Delamination-splitting or separation of bonded clutch material

Wear

Glazing

Cracking

Charring

Chips or metal particles embedded in the lining

Replace a composition plate which shows any of these conditions.

Steel Plates

Wipe the plates dry and check the plates for heat discoloration. If the surfaces are smooth, even if
color smear is indicated, you can reuse the plate. If the plate is discolored with heat spots or if the
surface is scuffed, replace the plate.

Causes of Burned Clutch Plates

The following conditions can result in a burned clutch plate:

Incorrect usage of clutch or apply plates

Engine coolant or water in the transmission fluid

A cracked clutch piston

Damaged or missing seals

Low line pressure

Valve body conditions

The valve body face is not flat.

Porosity is between channels.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

The valve bushing clips are improperly installed.

The checkballs are misplaced.

The Teflon® seal rings are worn or damaged.

ENGINE COOLANT/WATER IN TRANSMISSION

If antifreeze or water has entered the transmission, perform the following:

1. Disassemble the transmission.

2. Replace all of the rubber type seals (the coolant will attack the seal material which will

cause leakage).

3. Replace the composition-faced clutch plate assemblies and the 2-4 band assembly (the

facing material may separate from the steel center portion).

4. Replace all of the nylon parts (washers).

5. Replace the torque converter.

6. Thoroughly clean and rebuild the transmission, using new gaskets (bonded and non bonded)

and oil filter.

7. Flush the cooler lines after the transmission cooler has been properly repaired or replaced.

FLUID LEAK DIAGNOSIS

General Method

1. Verify that the leak is transmission fluid.

2. Thoroughly clean the suspected leak area.

3. Operate the vehicle for 24 km (15 mi) or until normal operating temperatures are reached.

4. Park the vehicle over clean paper or cardboard.

5. Shut OFF the engine.

6. Look for fluid spots on the paper.

7. Make the necessary repairs.

Powder Method

1. Thoroughly clean the suspected leak area with solvent.

NOTE:

The antifreeze or water will deteriorate the seals, gaskets and the
glue that bonds the clutch material to the pressure plate. Both
conditions may cause damage to the transmission.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3