TM 5-3805-281-24-1
Diagnostic Information
DIAGNOSE PILOT 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 Functions Cannot Be
Pilot shut-off lever in LOCK position
Push shut-off lever to UNLOCK
Operated
(rearward)
position (forward).
Pilot pressure regulating valve stuck
Test pilot pressure regulating valve.
open
See Group 9025-25. Inspect. See
Group 3360.
Pilot pump failure
Remove and inspect pilot pump. See
Group 3360.
Function Does Not Stop When
Control valve spool stuck
Manually move spool to check for
Control Lever Released
sticking. See Group 3360.
Pilot controller
Check for sticking spool. See Group
3360.
Some Functions Cannot Be
Pilot cap
Inspect for leakage at pilot cap. See
Operated, All Others Are Normal
Group 3360.
9025
Pilot controller or hoses to function
Check pilot controller hoses or pilot
15
that cannot be operated
controller. See Group 3360.
14
Flow regulator valve
Check for stuck spools or check
valves. See Group 3360.
Control valve spool stuck.
Manually move spool to check for
sticking. See Group 3360.
All Functions Slow
Pilot filter plugged
Replace pilot filter.
Low pilot system pressure
Check pilot pressure regulating valve
pressure setting. See Group
9025-25.
Restriction in pilot shut-off valve
Check pilot shut-off lever position.
See Group 9025-20.
Continued on next page
TX,9025,GG2527
1919NOV971/2
