TM 9-2320-387-24-l
. KNOWN INFO
:AN WONT DISENGAGE
NIRING OK
POSSIBLE
PROBLEMS
LOW POWER
STEERING
PRESSURE
LEAKS
CONTROL VALVE
I
KNOWN INFO
FAN WONT DISENGAGE
WIRING OK
HOSES ARE LEAK-FREE
LOW POWER
STEERING
PRESSURE
CONTROL VALVE
KNOWN INFO
-AN WON’T DISENGAGE
NIRING OK
iOSES ARE LEAK-FREE
POSSIBLE
PROBLEMS
LOW POWER
STEERING
PRESSURE
CONTROL VALVE
FAN DRIVE
LOOK FOR LEAKY HOSES
GOING TO AND FROM THE
CONTROL VALVE AND
FAN DRIVE. ARE ALL OF
THE HOSES LEAK-FREE?
IS THE PRESSURE IN THE
CONTROL VALVE SUPPLY
HOSE AT LEAST 90 PSI (62 1 kPa)?
DIAGNOSTIC FLOWCHART
-
r OPTIONS
VISUAL
REASON FOR QUESTION
Leaky hydraulic hoses may prevent
the drive from disengaging.
TEST OPTIONS
1, STE/lCE-R TEST 50 (Page 2-495)
2. PRESSURE GAUGE
REASON FOR QUESTION
90 PSI (621 kPa) is the
minimum required to disengage
the drive.
f
tin
CONNECT BOTH TIME-DELAY
MODULE ELECTRICAL
CONNECTORS, JUMPER 458A
TO 4588. IS THE PRESSURE
IN THE FAN DRIVE HOSE
AT LEAST 90 PSI (621 kPa)?
f OPTIONS
1. STEXE-R
TEST 50 (Page 2-495
2.PRESSUREGAUGE
REASON FOR QUESTION
Check to see if control valve is
open.
