TM 5-3805-280-24-1
Diagnostic Information
Symptom
Problem
Solution
Low pump flow
Check propel cycle times. Do
Hydraulic Pump Flow Test. See
Group 9025-25.
Engine performance low
Test engine performance. See
Group 9010-25.
Combined Propel and Dig
Flow combiner valve
Check for sticking or stuck valve
Functions Slow or No Power
spool. See Group 3360.
Propel-boom down selector valve
Check for sticking or stuck valve
spool. See Group 3360.
Propel Is "Jerky"
Track sag too tight or too loose
Adjust track sag. See Adjust Track
Sag in Group 9020-20.
No oil or low oil level in rollers
Fill with correct oil. See General
Information Section.
Brake valve shuttle valve or servo
Inspect shuttle valve seat. See
piston shuttle valve seat leakage.
Group 0260.
Propel park brake leakage
Inspect propel park brake piston.
See Group 0260.
9025
Mechanical failure in propel motor or
Inspect motor and gearbox. See
15
Groups 0250 and 0260.
23
Deformed track frame
See Undercarriage Appraisal Manual
SP326. Repair or replace
components.
Excavator Will Not Hold Back
Counterbalance valve spool stuck
Inspect counterbalance valve spool.
and Park Brakes Engage and
See Group 0260.
Disengage When Traveling Down
an Incline
Excavator Will Not Turn
Counterbalance valve spool stuck
Inspect counterbalance valve spool.
Smoothly In One Direction or
See Group 0260.
Park Brake Grabs
TX,15,GG2235
1913AUG983/3
6-112