TM 9-2320-279-20-2
16-198.8.2
Change 4
Cab and Body Maintenance Instructions (Cont)
Supplies
None
This task covers:
a. Adjustment
b. Follow-on Maintenance
INITIAL SETUP
Personnel Required
MOS 63S, Heavy wheel vehicle mechanic
Equipment Condition
TM or Para
Condition Description
TM 9-2320-279-10 Shut off engine.
References
None
Special Tools
None
16-49.4. RELIEF VALVE PRESSURE ADJUSTMENT (M978) (MODEL C).
Models
M978
Test Equipment
None
Special Environmental Conditions
None
General Safety Instructions
No smoking, flame, sparks, and hot
or glowing objects within 50 ft (15 m)
of vehicle.
a. Adjustment.
WARNING
·
Never adjust relief valve so that
personnel must stand on strongback (5)
to operate latch (1). If there is any
residual pressure in tank when relief
valve is open, personnel may lose their
balance and fall. Failure to comply
may result in injury or death to
personnel.
·
Failure to relieve tank pressure may
result in sudden, unexpected loss of
pressure. Failure to comply may result
in injury or death to personnel.
(1)
Relieve vapor pressure or vacuum from cargo tank.
(2)
Open latch (1) to remove plastic plug (2).
(3)
Place wrench over nut (3) and insert hex key into stem (4).
(4)
Hold hex key stationary and turn wrench counterclockwise two full turns to loosen nut (3).
(5)
Pressure may now be adjusted by rotating stem (4) with hex key.
