TM-9-2520-238-34
M113A1 FOV, M113A2 FOV, M548 AND M548A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL; RIGHT ANGLE DRIVE, COOLING FAN; GEARCASE, TRANSFER; DRIVE ASSEMBLY, FINAL; DIFFERENTIAL, STEERING CONTROL; BRAKE, SINGLE DISK; CYLINDER ASSEMBLY, HYDRAULIC BRAKE
TM-9-2520-238-34 - Page 33 of 319
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
DIFFERENTIAL MAKES EXCESSIVE NOISE OR VIBRATES WHILE MOVING
0010 00
INITIAL SETUP:
Maintenance Level
Direct/General Support
Tools and Special Tools
General mechanic’s tool kit (WP 0034 00, Item 37)
Personnel Required
Track Vehicle Repairer
References
See your-20
Equipment Condition
Differential removed from carrier (See your -20)
Disassemble for inspection per repair differential right
angle gearbox (WP 0029 00)
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
DIFFERENTIAL MAKES EXCESSIVE NOISE OR VIBRATES WHILE MOVING
0010 00
INITIAL SETUP:
Maintenance Level
Direct/General Support
Tools and Special Tools
General mechanic’s tool kit (WP 0034 00, Item 37)
Personnel Required
Track Vehicle Repairer
References
See your-20
Equipment Condition
Differential removed from carrier (See your -20)
Disassemble for inspection per repair differential right
angle gearbox (WP 0029 00)
Repair output shaft assemblies (WP 0025 00)
T
TN
NO
NO
NO
NO
YN
2YN
3YN
4YN
NO
Y
2Y
3Y
4Y
YES
YES
YES
YES
YES
1. Inspect bevel gear backlash to see if it has been adjusted.
2. Has bevel gear backlash been adjusted?
1. Inspect shaft gear bearing to see if it has been adjusted.
2. Has shaft gear bearing been adjusted?
1. Inspect shaft gear bearings for damage.
2. Are shaft gear bearings undamaged?
1. Inspect bevel gear shaft bearings (WP 0029 00).
2. Are bevel gear teeth undamaged?
1. Inspect output shaft bearings.
2. Are output shaft bearings serviceable?
1. Adjust bevel gear backlash
(WP 0029 00).
2. Verify no faults found.
1. Adjust shaft gear bearing
(WP 0029 00).
2. Verify no faults found.
1. Replace damaged bevel gear shaft
bearing (WP 0029 00).
2. Verify no faults found.
1. Replace damaged shaft gear
bearings (WP 0029 00).
2. Verify no faults found.
1. Replace output shaft bearings
(WP 0025 00).
2. Verify no faults found.
0010 00-1
0004 00-4
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