TM 5-3805-281-24-1
Diagnostic Information
DIAGNOSE SWING 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
Swing Speed Slow In Both
Low pilot system pressure
All other functions are slow. See
Directions
Diagnose Pilot Circuit Malfunctions.
See Group 9025-15.
Crossover relief valve
Test crossover relief valve pressure.
See Group 9025-25.
Swing valve leakage
Inspect swing valve. See Group
3360).
Swing motor leakage
Test swing motor for leakage. See
Group 9025-25.
Swing park brake
Check pilot pressure to swing brake
release valve. See Group 9025-25.
Worn rear pump
Check left track cycle time. It will be
slow if rear pump is worn. See
Group 9025-25.
9025
15
Swing Speed Slow or Does Not
Pilot circuit malfunction
See Diagnose Pilot Circuit
18
Operate In One Direction
Malfunctions. See Group 9025-15.
Swing make-up valve leakage
Inspect make-up valves. See Group
3360.
Swing crossover relief valve
Test swing crossover relief valves.
malfunction
See Group 9025-25.
Upperstructure Drift With Swing
Swing park brake
Inspect swing park brake. See
Valve In Neutral
Group 3360.
Swing crossover relief valve leakage
Test swing crossover relief valves.
See Group 9025-25.
Swing make-up check valve leakage
Inspect make-up valves. See Group
3360.
Continued on next page
TX,9025,GG2529
1919NOV971/2
3
