TM 9-2330-388-14
(c) Loosen jam nut and turn adjusting nut until
4-33.
Emergency Valve Vent Overhaul
tube has 1/8-inch vertical travel.
General. The emergency valve vent is attached
a.
(d) Tighten jam nut.
to the top of the tank near the manhole cover. It is
connected to the emergency valve by an actuating tube
(e) Open emergency valve and ensure that
4-34. Before the vent can be removed or adjusted water
emergency valve vent also opens.
must be drained from the semitrailer tank.
b.
Removal
4-34.
Emergency Valve Control and Cable Service,
(1) Make sure emergency valve is closed.
(2) Remove manhole cover to aid in removal of
a.
Cleaning and Inspection
(1) Clean control handle of valve and
NOTE
connecting parts cable and emergency valve.
When vent is being removed, the connector
(2) Inspect for cracks in control handle, frayed
and tube will separate from the vent. Hold
cables, loose U-bolts, loose or bent cable runways, cotter
the tube while the vent is being removed to
pins and control mounting bolts.
keep It from falling Into tank, then remove the
tube.
b.
Service
(3) Remove eight capscrews that fasten vent to
(1) Tighten any loose U-bolt cable connectors,
the top of the tank. Remove the vent and gasket.
adjusting bolts, and bracket mounting bolts at each end
of cable. Adjust if necessary.
c.
Cleaning and Inspection
(2) Lubricate all linkage.
Clean vent
c.
Adjustment
d.
Installation
(1) Install tube and connector into adapter.
(1) Ensure that control handle is pushed in and
Hold in place by hand.
that the emergency valve is closed.
(2) Position gasket on top of vent mount place
(2) Loosen U-bolt connectors to loosen cable
on to of tank, aligning the connector with the vent. Hold
end connections.
complete assembly in place and install eight capscrews.
(3) Remove all slack in cables, then tighten U-
bolt connectors.
e.
Adjustment
(4) Check that emergency valve will open and
(1) Emergency valve vent must be open
close when control handle is operated.
whenever the emergency valve is opened.
(5) Pull on valve handle to open emergency
(2) If vent does not open, adjust vent as
valve.
follows:
(6) Repeat steps (1) through (5) if cables do
not function properly.
WARNING
Entry into the tank through the one manhole
d.
Removal
is extremely hazardous.
Workers must
contact the supporting safety office and
Tag and disconnect control cables from the
comply
with
confined
space
entry
emergency valve control. Remove two screws and nuts
requirements. DO NOT ENTER the tank
that secure control to side of cabinet. Remove valve
unless you are trained in confined space
control.
entry, all entry requirements have been met
and a permit issued.
e.
Disassembly and Assembly
(a) Adjustment must be done from inside tank.
(1) Remove roll pin (8) securing shaft (9) to
bracket (7), fig. P35.
(b) Close the emergency valve.
(2) Remove shaft (9). Remove lever (1) and
the trip bar assembly (10).
4-95