Section V. TROUBLESHOOTING
a. This section contains troubleshooting in-
formation for locating and correcting most of the
operation troubles which may develop in the
drums and their components. Each malfunction
for an individual component, unit, or system is
followed by a list of tests or inspections which will
help you to determine corrective actions to take.
b. This manual cannot list all malfunctions that
may occur, nor all tests or inspection and correc-
tive actions. If a malfunction is not listed or is not
corrected by listed corrective actions, notify your
c. Table 4-2 lists the common malfunctions
which you may find during the operation or
maintenance of the drums and their components.
You should perform the tests/inspections and cor-
rective actions in the order listed.
Refer to table 4-2 for troubleshooting procedures
applicable to the drums. Any trouble, the correc-
tion of which is beyond the scope of organizational
maintenance should be referred to direct support
Table 4-2. Troubleshooting
TEST OR INSPECTION
COUPLER VALVE ASSEMBLY
1. Coupler Valve Assembly Stem Leaks.
Inspect for damaged coupler valve assembly preformed packing.
Install serviceable preformed packing on valve stem (para 4-14).
2. Pressure Control Coupling Halves Leak.
Inspect for damaged or missing gasket.
Install a serviceable gasket.
3. Fuel Appears on Pressure Control Body Between the Two Main Castings.
Step 1. Inspect for broken pilot valve bellows assembly.
Install a serviceable valve (para 4-22).
Step 2. Inspect for damaged preformed packing in pilot valve.
Install serviceable preformed packing (para 4-22).
Step 3. Inspect for damaged venturi preformed packing.
Install a serviceable venturi preformed packing (para 4-23).
Step 4. Inspect venturi throat for damage.
Install serviceable venturi (para 4-23).
4. Diaphragm Valve Fails.
Step 1. Inspect for ruptured diaphragm.
Install a serviceable diaphragm (para 4-20).
Step 2. Inspect compression ring for damage.
Install serviceable compression ring (para 4-20).