Cause
| Correction
|
DEFINITION: While shifting from HI range to LO range, there is gear clashing or no HI range; or the transfer case will not shift from 2 wheel drive to 4 wheel drive.
Review the
Symptoms - Transfer Case
and perform the necessary inspections.
|
Mode shift clash
|
- Disassemble the transfer case. Refer to
Transfer Case Disassemble
in Transfer Case - Isuzu T150 Unit Repair.
- Inspect the synchronizer components for being faulty. Refer to
Transfer Case Cleaning and Inspection
in Transfer Case - Isuzu T150 Unit Repair.
- Replace the synchronizer if faulty. Refer to
Transfer Case Assemble
in Transfer Case - Isuzu T150 Unit Repair.
|
Mode block
|
- Disassemble the transfer case. Refer to
Transfer Case Disassemble
in Transfer Case - Isuzu T150 Unit Repair.
- Inspect the synchronizer sleeve for sliding freely.
- Inspect the synchronizer for being faulty.
- Replace the synchronizer if faulty. Refer to
Transfer Case Assemble
in Transfer Case - Isuzu T150 Unit Repair.
|
High/low range shift fork assembly
|
- Inspect the high/low shift fork assembly for the following conditions:
• | The roller on the shift block for wear or damage |
• | Shift shaft spring broken |
• | Worn or melted range fork pads |
• | Cracked or bent shift fork |
- Replace the high/low shift fork assembly if found faulty. Refer
to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer
Case - Isuzu T150 Unit Repair.
|
High/low range sleeve
|
- Inspect the high/low range sleeve for the following conditions:
• | Engagement teeth for burrs or damage |
• | Sliding freely on the rear output shaft |
• | The range sleeve shift fork collar for excessive wear |
- Replace the range sleeve if faulty. Refer to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer Case - Isuzu T150 Unit
Repair.
|
Rear output shaft front support bearing
|
- Inspect for the following conditions:
• | Failed needle bearing in the input gear |
• | Journal on the rear output shaft for excessive wear or damage |
- Replace the bearing if faulty.
- Replace the rear output shaft if damaged.
|
Planetary carrier low gear
|
- Inspect the engagement teeth on the planetary carrier low gear
for burrs or damage. Refer to
Transfer Case Cleaning and Inspection
in Transfer
Case - Isuzu T150 Unit Repair.
- Replace the planetary carrier low gear if faulty. Refer to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer
Case - Isuzu T150 Unit Repair.
|
2/4 Wheel drive shift fork assembly
|
- Inspect the 2/4 wheel drive shift fork assembly for the following
conditions:
• | The roller on the shift block for wear or damage |
• | Shift shaft spring broken |
• | Cracked or bent shift fork |
- Replace the 2/4 wheel drive shift fork assembly if found faulty.
Refer to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer Case - Isuzu T150 Unit Repair.
|
Control actuator cam
|
- Inspect for the following conditions:
• | The control actuator cam at the shift fork cams for being worn |
• | The bushing for the control actuator cam shaft for being worn |
- Replace the following components if found faulty:
• | The control actuator cam |
• | The bushing for the control actuator shaft |
|
Drive sprocket
|
- Inspect for the following conditions:
• | Synchronizer engagement teeth on the drive sprocket for burrs
or damage |
• | Worn bushing in the drive sprocket |
• | Journal on the rear output shaft for excessive wear or damage |
- Replace the drive sprocket if it is damaged. Refer to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer Case -
Isuzu T150 Unit Repair.
- Replace the rear output shaft if it is damaged. Refer to
Transfer Case Disassemble
and
Transfer Case Assemble
in Transfer Case -
Isuzu T150 Unit Repair.
|