TM 10-4630-207-13&P
UNIT MAINTENANCE
WASTE WATER VACUUM TANK TRAILER
NSN 4630-01-513-8155
PRIMARY SHUTOFF
SERVICE, REPLACE
INITIAL SETUP:
Tools
Personnel Required
Tool Kit, General Mechanic's, Automotive (WP
MOS 77W, Water Treatment Specialist
Materials/Parts
Equipment Condition
Apron, Rubber (WP 0089 00, Table 2, Item 1)
Tank empty, at atmospheric pressure
Coveralls, Hooded (WP 0089 00, Table 2, Item 2) Tank cleaned and sanitized
Gasket, Manway Assembly (WP 0091 00, Item 15) Engine shut off
Gloves, Rubber (WP 0089 00, Table 2, Item 4)
Ignition key removed
Rags, Wiping (WP 0091 00, Item 28)
Emergency stop button pushed in
Respirator (WP 0089 00, Table 2, Item 8)
Wheel chocked
Emergency brake set
WARNING
Protective clothing and equipment must be worn. A heavy-duty rubber apron,
rubber gloves, safety splash goggles, respirator and/or face shield are
required when potential exists for contact with wastewater or contaminated
surfaces. Wastewater and surfaces may be contaminated with pathogenic
microorganisms, bacteria or viruses, which present a risk of serious illness or
death to personnel. Refer to cleaning and sanitizing procedures in WP 0018
SERVICE
The primary shutoff must be serviced when there is evidence that the mechanism is not shutting off tank
loading completely when the tank is full. In that case, moisture will escape through the upper air hose into
the moisture trap where it will collect. Whenever the amount of liquid drained from the moisture trap after
tank loading exceeds approximately one cup, the primary shutoff must be serviced. To service the primary
shutoff proceed as follows:
1. Ensure tank is at atmospheric pressure, isolation valve is open and pressure gage reads 0.
2. Remove the nut on the handle linkage (figure 1, item 1), and disconnect linkage.
3. Loosen hose clamp (figure 1, item 2) on upper air hose (figure 1, item 3) and disconnect it from the
isolation valve (figure 1, item 4).
0019 00-1
