TM 5-3805-280-24-1
Diagnostic Information
DIAGNOSE DIG CIRCUIT MALFUNCTIONS
NOTE: Diagnose malfunction charts are arranged from
most probable and simplest to verify, to least
likely and most difficult to verify.
Symptom
Problem
Solution
All Dig Functions Slow or No
Hydraulic system malfunction
See Diagnose Hydraulic System
Power
Malfunctions. See Group 9025-15.
Pilot circuit malfunction
See Diagnose Pilot Circuit
Malfunctions. See Group 9025-15.
Front or rear pump regulator
Do Hydraulic Pump Regulator
Adjustments. See Group 9025-25.
System relief valve
Test system relief valve. See Group
9025-25.
Front or rear pump control valve
Check pressure. See Group
9025-25. Inspect. See Group 3360.
Hydraulic pumps
Check pumps using cycle time. Do
Hydraulic Pump Flow Test. See
Group 9025-25.
9025
Some Dig Functions Slow (Not
Pilot circuit malfunction
See Diagnose Pilot Circuit
15
All)
Malfunctions. See Group 9025-15.
17
Control valve leakage
Check dig functions for drift. See
Group 9025-25.
Cylinder leakage
Test cylinder for leakage. See Group
9025-25.
Circuit relief valve
Test circuit relief valves. See Group
9025-25.
Valve spool sticking
Manually move spool to check for
sticking. See Group 3360.
Front and rear pump control valves
Check pressure. See Group
9025-25. Inspect. See Group 3360.
Continued on next page
TX,9025,GG2668 1913AUG981/2
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