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![]() TM 5-2420-222-20-1 
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED 
MALFUNCTION 
TEST OR INSPECTION 
CORRECTIVE ACTION 
27. HYDRAULIC EARTH DRILL DOES NOT WORK 
Operate backhoe bucket  (TM 5-2420-222-10). 
a. If backhoe bucket operates normally, replace hydraulic earth drill boring head (page 2-1870). 
b. If backhoe bucket does not operate properly, 30 to Hydraulic System Malfunction 17: Backhoe 
Bucket Cylinder Does Not Work (page 2-124). 
2-135 
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