TM 9-2350-230-12, C6
CLOSED BREECH SCAVENGING GROUP ON GUN/LAUNCHER
6.
WITH PRESSURE ABOVE 630 PSI, MOMENTARILY
M551 VEHICLES EQUIPPED WITH M81E1 GUN/LAUNCHER
ACTUATE MANUAL DISCHARGE LEVER (FIG. 3-2.4)
INCORPORATE A CLOSED BREECH SCAVENGING
TO CHECK OPERATION OF SYSTEM.
(SINCE
SYSTEM. (FOR DESCRIPTION OF THE SYSTEM, REFER
DISCHARGE PRESSURE IS REGULATED, OPERATION
TO PARAGRAPH 3-3.2).
IS SAME AT ANY GAGE PRESSURE ABOVE 630 PSI.)
OPERATING PROCEDURE
1. CHECK TO ASSURE THAT GUN/LAUNCHER IS CLEAR.
2. OPEN AIR SHUTOFF VALVE (FIG. 3-2.4).
NOTE: COMPRESSOR SHUTS DOWN FOR
3. START VEHICLE ENGINE AND SET THROTTLE AT
APPROXIMATELY 10 SECONDS EVERY 25-35 MINUTES TO
FAST IDLE (TABLE 2-9).
DUMP ACCUMULATED MOISTURE. THIS IS NORMAL, NOT
4. TURN TURRET CONTROL POWER SWITCH "ON" AND
A MALFUNCTION.
GUN AND TURRET SELECTOR SWITCH TO "COAX"
OR "CONV". (SCAVENGER SYSTEM OPERATES IN
PRESSURE RECOVERY RATE
"MISSILE" MODE, BUT COMPRESSOR DOES NOT.)
APPROXIMATE
RECOVERY
RATE,
BASED
ON
5. TURN COMPRESSOR SWITCH "ON". COMPRESSOR
COMPRESSOR OPERATING NORMALLY AND NO LEAKS
SHOULD OPERATE IF PRESSURE IS LESS THAN 2800
IN SYSTEM, IS AS FOLLOWS:
(*100) PSI, AND SHOULD SHUT OFF WHEN
0 - 800 PSI
27 TO 30 MINUTES
PRESSURE REACHES 3100 (*100) PSI.
800 - 3100 PSI
70 MINUTES
(33 PSI PER MINUTE)
COMPRESSOR AIR FILTER AND ODDMENT
COMPRESSOR ON/OFF SWITCH
STOWAGE BOX
WE 120681
Figure 3-2.3. Closed breech scavenger system operation (1 of 2).
3-8.3
