Manual:HUMMER Hummer H3 Base 2010Page:20363 / 37523



Test Description — 2010 Hummer H3 Base, Automatic Service Manual

Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  Use an approved method to clean the transmission, to ensure the leak location is correctly identified. If using a powder method or dye method, ensure the products are compatible with the transmission fluid.
  2. 6:  With the 4WD application, the sealing surface, for the transmission rear seal, is on the transfer case input shaft.
  3. 7:  With the 4WD application, a weep hole is located at the transfer case to transmission flange. If fluid is leaking at the weep hole, verify if it is transmission fluid or transfer case fluid.
  4. 18:  Two bolts, for the clutch housing, require the use of sealer.
Step Action Yes No
DEFINITION: Visible sign of the transmission fluid leaking from the transmission.
1 Did you review the Symptoms - Manual Transmission and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission 
2
  1. Inspect for the transmission fluid level being higher than the recommended level. Refer to Transmission Fluid Replacement .
  2. Adjust the transmission level if incorrect.
Was the transmission fluid level too high?		 Go to Step 31  Go to Step 3 
3  Verify the location of the leak.
  1. Clean the transmission assembly.
  2. Operate the vehicle for 24 km (15 mi), or until normal operating temperatures are reached.
  3. Visually inspect, or use the powder method or dye and black light method, to locate the leak.

Is the leak occurring at the drain or fill plug?		 Go to Step 4  Go to Step 5 
4 Replace the drain or fill plug gasket. Refer to Transmission Fluid Replacement .
Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
5 Is the leak at the transmission output shaft seal? Go to Step 6  Go to Step 7 
6  Remove the output shaft seal and inspect for the following conditions. Refer to Transmission Housing Oil Seal Replacement - Rear .
  • Damaged or worn seal
  • Damaged seal bore
  • Improper installation
  • Cracks in the component
  • Propeller shaft yoke sealing surface is scratched, nicked, damaged, or worn
  • If 4WD, transfer case input shaft seal surface damaged
  • Loose or worn bearing causing excessive seal wear

Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
7  If 4WD, is the leak at the transfer case to transmission weep hole? Go to Step 8  Go to Step 9 
8
  1. Remove the transfer case. Refer to Transfer Case Assembly Replacement .
  2. Inspect the shift shaft plug for leaking.
  3. Replace the shift shaft plug if leaking. Refer to Transmission Disassemble  and Transmission Assemble .
Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
9 Is the leak at the shift lever area? Go to Step 10  Go to Step 11 
10
  1. Inspect the shift control lever lower boot for damage.
  2. Inspect for loose shift control housing mounting bolts.
  3. Remove the shift control housing. Refer to Control Lever and/or Boot Replacement .
  4. Replace the shift control lever lower boot if damaged.
  5. Inspect the shift control lever sealing surfaces for scratched, nicked or damaged.
Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
11 Is the leak at the front of the transmission? Go to Step 12  Go to Step 21 
12
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Remove the clutch actuator cylinder. Refer to Clutch Actuator Cylinder Replacement .
Is the input shaft seal leaking?		 Go to Step 13  Go to Step 14 
13
  1. Inspect for the following conditions if the input shaft seal is leaking:
    • Damaged or worn seal
    • Damaged seal bore
    • Improper installation
    • Cracks in the component
    • Input shaft sealing surface is scratched, nicked, damaged or worn
    • Loose or worn bearing causing excessive seal wear
  2. Replace the input shaft seal if leaking. Refer to Transmission Input Shaft Seal Replacement .
Did you find and repair the condition?		 Go to Step 31  Go to Step 14 
14 Inspect the shift rail plug for leaking.
Is the transmission leaking at the shift rail plug?		 Go to Step 15  Go to Step 16 
15 Replace the shift rail plug. Refer to Transmission Disassemble  and Transmission Assemble .
Did you find and repair the condition?		 Go to Step 31  Go to Step 1 
16 Inspect for leaking at the front retainer bolts.
Is the transmission leaking at the front retainer bolts?		 Go to Step 17  Go to Step 18 
17 Remove the leaking front retainer bolts and install with the proper sealer. Refer to Transmission Disassemble  and Transmission Assemble .
Did you find and repair the condition?		 Go to Step 31  Go to Step 1 
18  Inspect for leaking at the clutch housing bolts.
Is the transmission leaking at the clutch housing bolts?		 Go to Step 19  Go to Step 20 
19 Remove the leaking clutch housing bolts and install with the proper sealer. Refer to Transmission Disassemble  and Transmission Assemble .
Did you find and repair the condition?		 Go to Step 31  Go to Step 20 
20
  1. Inspect the case for cracks or porosity.
  2. Replace the transmission front case half if it is faulty. Refer to Transmission Disassemble .
Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
21 Is the leak at the vehicle speed sensor (VSS)? Go to Step 22  Go to Step 23 
22
  1. Remove the VSS. Refer to Vehicle Speed Sensor Replacement .
  2. Inspect for the following conditions:
    • Cut or damaged O-ring seal
    • VSS over tightened causing deformation in the VSS
    • VSS bore scratched or damaged
Did you find and repair the condition?		 Go to Step 31  Go to Step 1 
23 Is the leak at the backup lamp switch? Go to Step 24  Go to Step 25 
24
  1. Remove the backup lamp switch. Refer to Backup Lamp Switch Replacement .
  2. Inspect for the following conditions:
    • Cross threaded or damaged threads
    • Insufficient sealant
    • Leaking switch
    • Improper installation
Did you find and repair the condition?		 Go to Step 31  Go to Step 1 
25 Is the leak at the shift shaft detent plugs? Go to Step 26  Go to Step 27 
26
  1. Remove the shift shaft detent plugs. Refer to Transmission Disassemble  and Transmission Assemble .
  2. Inspect for the following conditions:
    • Cross threaded or damaged threads
    • Insufficient sealant
    • Cracked case
    • Improper installation
Did you find and repair the condition?		 Go to Step 31  Go to Step 1 
27 Is the leak at the sealing flanges of the transmission cases? Go to Step 28  Go to Step 29 
28
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to Transmission Disassemble .
  3. Inspect the sealing surfaces. Refer to Transmission Case Cleaning and Inspection .
Did you find and repair the condition?		 Go to Step 31  Go to Step 29 
29 Is the leak coming from a crack or porosity in the transmission case? Go to Step 30  Go to Diagnostic Aids
30
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to Transmission Disassemble .
  3. Replace the faulty case. Refer to Transmission Extension Assemble  or Transmission Case Assemble  or Transmission Assemble .
Did you find and repair the condition?		 Go to Step 31  Go to Diagnostic Aids
31 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 1