Table 3-1. Troubleshooting Procedures (Con't).
TEST OR INSPECTION
EMERGENCY VALVE AND PRECHECK SYSTEM
14. EMERGENCY VALVE DOES NOT OPEN DURING UNLOADING
From under semitrailer, trace control cable tubing between emergency valve and
and tubing that connects emergency valve and emergency valve control lever inside
cabinet (see paragraph 2-2). Check that union at tubing grease fitting, midway be-
tween cabinet and emergency valve, is connected.
If control cable and tubing are damaged, or if union is disconnected, notify unit
Check for damage to emergency valve control lever in cabinet or to two remote
If any damage to emergency valve control lever in cabinet or to remote trip-re-
leases is found, notify unit maintenance.
15. EMERGENCY VALVE CYCLES OPEN AND CLOSED DURING BOTTOM LOADING
If emergency valve is cycling open and closed, it will be making an on or off
screeching noise and tank will be filling slowly.
Check strainer assembly (3)
for obstruction. While fuel is
being bottom loaded, place
a suitable container under
strainer assembly. Remove
in. (6.4 mm) center plug
(2) and allow force of fuel to
clear obstruction through
opening. Install plug.
If obstruction will not
clear, notify unit main-
tenance t o s e r v i c e
Check that air has been
properly bled from jet level
Bleed air from jet level