Hummer H2. Manual — part 2573

Fig. 260: Inspecting Control Valve Body For Channel Witness Marks
Courtesy of GENERAL MOTORS CORP.

1. Inspect the valve body to spacer plate gasket for valve body channel witness marks. The witness marks

should be complete. Incomplete witness marks may be caused by an uneven case surface. Incomplete
witness marks may also be caused by cross-channel leaks.

2. Inspect the valve body casting for the following conditions:

z

Porosity

z

Cracks

z

Damaged machined surfaces

z

Chips or debris

2004 Hummer H2

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

Cleaning Procedure

1. Clean all the valves, springs, bushings, and the control valve body in clean solvent.

2. Dry all the parts using compressed air.

Installation Procedure

Fig. 261: Identifying Isolator Valve & Regulator Apply Valve
Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Valve Springs Can Be Tightly Compressed Caution in

Cautions and Notices.

IMPORTANT: Lubricate all parts with DEXRON(R)lll automatic transmission fluid before

2004 Hummer H2

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

1. Install the following items:

1. The isolator valve (398)

2. The regulator apply spring (397)

3. The regulator apply valve (380)

4. The bore plug (381)

5. The bore plug retainer (395)

Fig. 262: View Of 4-3 Sequence Valve & 3-4 Relay Valve
Courtesy of GENERAL MOTORS CORP.

2. Install the following items:

installation.

2004 Hummer H2

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E

1. The 4-3 sequence valve spring (382)

2. The 4-3 sequence valve (383)

3. The 3-4 relay valve (384)

4. The bore plug (381)

5. The bore plug retainer (395)

Fig. 263: Locating 3-4 Shift Valve
Courtesy of GENERAL MOTORS CORP.

3. Install the following items:

1. The 3-4 shift valve (385)

2. The 3-4 shift valve spring (386)

3. The bore plug (381)

4. The bore plug retainer (395)

2004 Hummer H2

2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E