Table 3-1. Operator's Preventive Maintenance Checks and Services
Time required: 1.3
Time required: 1.1
Time required: 1.15
ITEM TO BE INSPECTED
Inspect the M9 gun group for serviceability Check the trigger safety and trigge r for operation. Check
that gun collar and setscrews are present and are tight. Check rubber gloves and M6A2 hood for
serviceability Make sure that all the accessories authorized area present and in serviceable
Check all catches and make sure that the container group and pressure group are securely fastened
to the base group.
Make sure that the clamp which secures the nozzle of the dispersion section to the mouth of the
container is tight.
Operate the ball valve handle to make sure it works. Close the ball valve.
Open the lever plug and globe valves and read the pressure on the dial indicating pressure gages.
Do not use a disperser if the high pressure dial indicating pressure gage does not read between
1,900 and 2,100 psi and the low pressure dial indicating pressure gage does not read between 45
and 55 psi. Close the lever plug and globe valves.
Manually trip the relief valve to relieve any pressure in the high and low pressure lines.
Check the readings on the dial indicating high and low pressure gages while the disperser is in
operation. Close the globe and lever plug valves when the dial indicating high and low pressure
gages read zero. Close the ball valve.
Check all connections for air leaks. Particular attention must be paid to the clamp which secures
the nozzle of the dispersion section to the mo uth of the container. If agent leaks are observed
around this clamp, close the globe and lever plug valves. After the pressure has been relieved
through the corrugated hose; close the ball valve. Tighten the wing nut by hand.
If the M9 gun is used during operation, check the nonmetallic hose connections for leaks and the
trigger and trigger safety operation.
Before returning the disperser to organizational maintenance personnel, thoroughly de contaminate
the exterior of the disperser by washing it down with water and permitting it to air dry. If the gun
is used, the gun exterior must be decontaminated with water and air dried as well.
After the disperser has thoroughly air dried, make sure the ball value is closed. Open the globe and
level plug pressure valves. Hold the relief valve in the open position until all pressure is relieved.
Keep records complete (TM 38-750). Inspect the log book to see that proper entries have been made.
Section II. MAINTENANCE
Under supervision of qualified
Field CB Mask Hood
personnel, the operator will perform the following:
a. Description. The ABC-M6A2 field CB mask hood,
(1) Assemble the ABC-M6A2 hood (when
issued) to the ABC-M17 or M17A1 mask.
ABC-M17 and M17A1 mask. This mask hood is made of
(2) Decontaminate the hood and mask as required.
butyl rubber coated nylon cloth with openings that fit
(3) Clean and condition the mask and hood as a
securely around the ABC-M17 or M17A1 field CB mask.
unit, once assembled. Use a clean cloth and a warm
This mask hood is used to protect the wearer's head and
neck from vapors, aerosols, and droplets of agent. TM
approved) to clean the hood and mask unit. Wring the
3-4240-279-10 contains a detailed description of both the
cloth almost dry. Rinse by wiping with a clean
M17 series mask and the ABC-M6A2 field CB mask