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Finding the Right Troubleshooting Procedure-continued |
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 TM 9-2520-238-34
INTRODUCTION TO HOW TO USE TROUBLESHOOTING--Continued
0004 00
Check title to make sure you are troubleshooting the correct system for the problem. Next, read the INITIAL SETUP
carefully. Make sure you have all the items listed in the INITIAL SETUP. Some access steps in Equipment Conditions may
not need to be performed depending on the fault location. It's up to you to decide which are necessary for your particular
problem.
TM 9-2520-238-34
0010 00
DIFFERENTIAL MAKES EXCESSIVE NOISE OR VIBRATES WHILE MOVING
INITIAL SETUP:
Maintenance Level
References
Direct/General Support
See your-20
Tools and Special Tools
Equipment Condition
General mechanic's tool kit (WP 0034 00, Item 37)
Differential removed from carrier (See your -20)
Personnel Required
Disassemble for inspection per repair differential right
angle gearbox (WP 0029 00)
Track Vehicle Repairer
Repair output shaft assemblies (WP 0025 00)
Now you're ready to begin troubleshooting. Look at the first block. Read step1. If the answer to the question, "Has bevel gear
backlash been adjusted?" is YES, follow the Yes arrow to the next box. Read step 1. If the answer to the question, "Has shaft
gear bearing been adjusted?" is YES , follow the YES arrow to the next box. Follow the same procedure or each box. If you
reach the last box on this page and the answer to the question "Are output shaft bearings serviceable?" is YES, follow YES
arrow to the next box.
TM 9-2520-238-34
0010 00
DIFFERENTIAL MAKES EXCESSIVE NOISE OR VIBRATES WHILE MOVING
INITIAL SETUP:
Maintenance Level
References
Direct/General Support
See your-20
Tools and Special Tools
Equipment Condition
General mechanic's tool kit (WP 0034 00, Item 37)
Differential removed from carrier (See your -20)
Personnel Required
Disassemble for inspection per repair differential right
angle gearbox (WP 0029 00)
Track Vehicle Repairer
Repair output shaft assemblies (WP 0025 00)
T
TN
NO
1. Inspect bevel gear backlash to see if it has been adjusted.
1. Adjust bevel gear backlash
2. Has bevel gear backlash been adjusted?
2. Verify no faults found.
YES
Y
YN
NO
1. Inspect shaft gear bearing to see if it has been adjusted.
1. Adjust shaft gear bearing
2. Has shaft gear bearing been adjusted?
2. Verify no faults found.
YES
2Y
2YN
NO
1. Inspect shaft gear bearings for damage.
1. Replace damaged shaft gear
2. Are shaft gear bearings undamaged?
bearings (WP 0029 00).
2. Verify no faults found.
YES
3Y
3YN
NO
1. Inspect bevel gear shaft bearings (WP 0029 00).
1. Replace damaged bevel gear shaft
2. Are bevel gear teeth undamaged?
bearing (WP 0029 00).
2. Verify no faults found.
YES
4Y
4YN
NO
1. Inspect output shaft bearings.
1. Replace output shaft bearings
2. Are output shaft bearings serviceable?
2. Verify no faults found.
YES
0010 00-1
0004 00-4
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