TM-750-116
TM
SUPERSEDES
T E C H N I C A L
GENERAL
COPY
750-116
DATED
M A N U A L
PROCEDURES
FOR
PURGING
AND
CHARGING
O F
FIRE
CONTROL
INSTRUMENTS
DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited.
HEADQUARTERS,
DEPARTMENT
MAY 1993
OF
THE
ARMY
14
MAY
1984
WARNING
High pressure nitrogen gas is used during purging and charging of this equipment. Keep face and body clear of release valves. Failure to observe safety precautions may result in severe injury or death.
When using compressed nitrogen gas in confined areas, use extreme care; gas could cause asphyxiation.
Do not store compressed nitrogen gas tanks in upright position without securing in a rack or chaining to a wall or
support. Do not drop tank of compressed gas.
Handle instruments with radioluminous light source with care. To avoid possible radioactive contamination. do not
purge or charge an instrument that has a damaged or inoperative radioluminous light source. Immediately wrap instrument in plastic and notify the local Radiation Protection Officer (RPO).
Solvent vapors are toxic. Do not use solvent in a confined space. Avoid long periods of breathing solvent vapors
and/or contact with skin.
Compressed air presents a serious hazard. Its use for cleaning and drying purposes should be permitted only where
all other methods have failed. When it is necessary to use compressed air for cleaning or drying, adequate controls
must be provided to protect the user, adjacent operators, and other personnel in the area. The minimum amount of air
pressure required to perform the specific operations must be used. All users of compressed air must wear eye protection. Compressed air will not be used for cleaning purposes except where reduced to less than 30 psig.
a
TM 750-116
C1
HEADQUARTERS
Department of the Army
Washington D.C., 24 November 1995
Change
No. 1
GENERAL PROCEDURES
FOR
PURGING AND CHARGING OF
FIRE CONTROL I N S T R U M E N T S
TM 750-116, dated 5 May 1993 is changed as follows:
1. Remove old pages and insert new pages as indicated below.
Insert Pages
Remove Pages
2-1 thru 2-4
2-1 thru 2-4
2. New or changed material is indicated by a vertical bar in the margin of the page. Illustration changes are
indicated by a pointing hand adjacent to the illustrations.
3. File this change sheet in front of the publication for reference purposes.
Change 1
DISTRIBUTION:
To be distributed in accordance with DA Form 12-34-E, block 0899
requirements for TM 750-116.
*TM 750-116
HEADQUARTERS
DEPARTMENT OF ARMY
TECHNICAL MANUAL
NO. TM 750-116
Washington, DC
5 May 1993
GENERAL PROCEDURES
FOR
PURGING AND CHARGING OF
FIRE CONTROL INSTRUMENTS
This manual is current as of 1 January 1993
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and
Blank Forms), or DA Form 2028-2, located in the back of this manual, direct to Commander, U.S. Army
Armament, Munitions and Chemical Command, ATTN: AMSMC-MAS, Rock Island, IL 61299-6000.
A reply will be furnished to you.
DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited.
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
CHAPTER 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..1-1
Section I.
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1-1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
1-2 Maintenance Forms, Records, and Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-3 Destruction of Army Materials to Prevent Enemy Use . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-4 Reporting Equipment Improvement Recommendations (EIR) . . . . . . . . . . . . . . . . . . 1-1
*This manual supersedes TM 750-116 dated 14 May 1984, including all changes.
i
TM 750-116
TABLE OF CONTENTS - Continued
Page
Section II.
Equipment Description and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-5 Equipment Characteristics, Capabilities, and Features . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-6 Safety, Care, and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-7 Corrosion Prevention and Control (CPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
CHAPTER 2. GENERAL PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 Setup of Purging and Charging Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2-3 Bleed Down of Purging and Charging Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-4 Time Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
2-5 Purging and Charging Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
CHAPTER 3. PURGING AND CHARGING SPECIFIC INSTRUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
ii
Section I.
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3-1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Section II.
Specific Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-2 Aiming Circle, M2A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-3 Binocular, M19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-4 Collimator, M1A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3-5 Computer, M21 Electronic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Ammo Select Unit
Cant Angle Sensor
Computer Unit
Gunner’s Control Unit
Output Unit
Rate Tachometer
3-6 Device, Alinement, M139/M140 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3-7 Devices, Boresight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
M26/M27
M26A1/M27A1
3-8 Mounts, Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
M137
M145/M145A1
M149/M149E1
M187
3-9 Periscope, M65 Battery Commander’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3-10 Periscopes, Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
M28C
M30C
M32El and M32CE1
M35E1
M36 and M36E1
M42
M44A, M44A2, M44A3, M44A4, M44A1E1, M44A2E1
M47
M48
M901
M981
*TM 750-116
TABLE OF CONTENTS - Continued
Page
3-11 Quadrants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
M14 and M14A1
M15
M17
M18
3-12 Rangefinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
Laser
AN/VVG-2
M17A1, M17B1C, and M17C
3-13 Sights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
BFV TOW/TOW2 Subsystem
Backup Sight PN 12316793
Integrated Sight Unit
Commander’s Relay Assembly
8635466 Infinity Sight
M44C Infinity
M61 Computing
Commander’s Extension, PN12285300
Control Unit, Image
Gunner’s Auxilliary Sight, PN 12278900
Gunner’s Primary Sight, PN 12282140, PN 12549761-2,
PN 12549761-3, PN 9377279-2
Tank Thermal
Commander’s Display
Gunner’s Display
Head Assembly
Power Converter
Weapon, PN 12279200
3-14 Telescopes, Articulated.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
M105D and M105F
M127 and M127A1
3-15 Telescopes, Elbow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
M114 and M114A1
M16A1D and M116 Series
M118 Series
M138
M139
3-16 Telescopes, Panoramic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-29
M12A7Q and M12A7S
M113 and M113A1
M115
M117 and M117A1
M137 and M137A1
M901A1
M981 FISTV
iii
TM 750-116
TABLE OF CONTENTS - Continued
Page
3-17 Telescopes, Straight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
M90A2
M134
3-18 Test Set, Receiver/Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33
3-19 Trainer, M55 Laser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
3-20 Unit, Reticle Projector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
APPENDIX A. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
APPENDIX B. EXPENDABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
APPENDIX C. ADDITIONAL SUPPLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX 1
LIST OF ILLUSTRATIONS
2-1 . . . . . . . . . Setup for Single Stage Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 . . . . . . . . . Setup for Two-Stage Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
3-1 . . . . . . . . . M2A2 Aiming Circle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3-2 . . . . . . . . . M19 Binocular . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3-3 . . . . . . . . . M1A1 Collimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3-4 . . . . . . . . . Ammo Select Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3-5 . . . . . . . . . Cant Angle Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3-6 . . . . . . . . . Computer Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3-7 . . . . . . . . . Gunner’s Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3-8 . . . . . . . . .0utput Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3-9 . . . . . . . . . Rate Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3-10 . . . . . . . .Ml39/Ml40 Alinement Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3-11 . . . . . . . .M26/M27 Boresight Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3-12 . . . . . . . . M26A1/M27A1 Muzzle Boresight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
3-13 . . . . . . . . M137 Telescope Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
3-14 . . . . . . . . M145/M145A1 Telescope Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
3-15 . . . . . . . . M149/M149E1 Telescope Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
3-16 . . . . . . . . M187 Telescope Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3-17 . . . . . . . . M65 Battery Commander’s Periscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
3-18 . . . . . . . . M28C Tank Periscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3-19 . . . . . . . . M30C Tank Periscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
3-20 . . . . . . . . M32E1 Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
3-21 . . . . . . . . M32E1 Daylight Body Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
3-22 . . . . . . . . M32E1 Passive Elbow Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
3-23 . . . . . . . . M36 Head Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
3-24 . . . . . . . . M36 Daylight Body Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11
3-25 . . . . . . .. M36 Infrared Body Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
3-26 . . . . . . . . M36 Passive Elbow Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
3-27 . . . . . . . . M42 Tank Periscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
3-28 . . . . . . . . M42 Tank Periscope - Late Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
3-29 . . . . . . . . M42 Tank Periscope - Modified Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
iv
*TM 750-116
LIST OF ILLUSTRATIONS – Continued
3-30 . . . . . . . . M44A Series Tank Periscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
3-31 . . . . . . . . M44A Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14
3-32 . . . . . . . . M44A Body Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14
3-33 . . . . . . . . M47 Tank Periscope Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
3-34 . . . . . . . . M48 Periscope Body Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
3-35 . . . . . . . M901/M981 Tank Periscope... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-16
3-36 . . . . . . . . M14 and M14A1 Quadrants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
3-37 . . . . . . . . M15 Quadrant - Old Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
3-38 . . . . . . . . M15 Quadrant - New Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-17
3-39 . . . . . . . . M17 and M18 Quadrants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
3-40 . . . . . . . . Laser Rangefinder Optical Cavity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
3-41 . . . . . . . . Laser Rangefinder Electronics Cavity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
3-42 . . . . . . . . AN/VVG-2 Receiver - Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
3-43 . . . . . . . . AN/VVG-2 Electronics Cavity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
3-44 . . . . . . . . M17A1 Body Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
3-45 . . . . . . . . M17A1 and M17C End Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
3-46 . . . . . . . . M17B1C End Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
3-47 . . . . . . . . Backup Sight, PN 12316793 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
3-48 . . . . . . . . Integrated Sight Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
3-49 . . . . . . . . Lamp Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22
3-50 . . . . . . . . Commander’s Relay Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22
3-51 . . . . . . . . Night Sight Cover Actuator Handle/Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
3-52 . . . . . . . . 8635466 Infinity Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
3-53 . . . . . . . . M44C Infinity Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
3-54 . . . . . . . . M61 Computing Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
3-55 . . . . . . . . Commander’s Extension PN 12285300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
3-56 . . . . . . . . Image Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-25
3 - 5 7 . . . . . . . . Gunner’s Auxiliary Sight PN 12278900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-25
3-58 . . . . . . . . Gunner’s Primary Sight PN 12282140, PN 12549761-2, PN 12549761-3, PN 9377279-2 3-25
3-59 . . . . . . . . Commander’s Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
3-60 . . . . . . . Gunner’s Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
3-61 . . . . . . . . Head Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
3-62 . . . . . . . . Power Converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-26
3-63 . . . . . . . . Weapon Sight PN 12279200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
3-64. . . . . . . . M105D Series Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
3-65 . . . . . . . . M127 Articulated Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
3-66 . . . . . . . . M114 Elbow Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
3-67 . . . . . . . . M118A2/M118A3 Elbow Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
3-68 . . . . . . . . M138 Elbow Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
3-69 . . . . . . . . M139 Elbow Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-28
3-70 . . . . . . . . M12A7Q Panoramic Telescope.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-29
3-71 . . . . . . . . M113 and M113A1 Panoramic Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-29
3-72 . . . . . . . . M115 Panoramic Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
3-73 . . . . . . . . M117/M117A2 Panoramic Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-30
3-74 . . . . . . . . M137 Panoramic Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-31
3-75 . . . . . . . . M137A1 Panoramic Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-31
3-76 . . . . . . . . M901A1 Panoramic Telescope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-32
3-77 . . . . . . . . M90A2 Straight Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33
3-78 . . . . . . . . M134 Straight Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33
3-79 . . . . . . . . Receiver/Transmitter Test Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33
3-80 . . . . . . . . M55 Barrel Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
3-81 . . . . . . . . M55 Deflector Optical Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
3-82 . . . . . . . . Unit, Projector, Reticle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-34
v
TM 750-116
LIST OF TABLES
3-1 . . . . . . . . . Leak Test, Integrated Sight Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-22
3-2 . . . . . . . . . Leak Test, Commander’s Relay Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
vi
TM 750-116
CHAPTER 1
INTRODUCTION
SECTION I
GENERAL INFORMATION
1-1. SCOPE. This manual provides general instructions for purging and charging fire control instruments with
dry nitrogen. If specific instructions are provided in a technical publication pertaining to a specific fire control item,
this publication does not attempt to take precedence over
that publication.
1-2. MAINTENANCE FORMS, RECORDS, AND REPORTS. Department of the
Army forms and procedures used for equipment maintenance will be those prescribed by DA PAM 738-750, The
Army Maintenance Management System.
1-4. REPORTING EQUIPMENT
IMPROVEMENT RECOMMENDATIONS
(EIR). If the equipment used in these procedures needs
improvement, let us know. Send us an EIR. You, the user,
are the only one who can tell us what you do not like about
your equipment. Let us know what you do not like about
the design or performance. Put it on an SF 368 (Quality
Deficiency Report). Mail it to us at Commander, U.S.
Army Armament, Munitions and Chemical Command,
ATTN: AMSMC-QAD, Rock Island, IL 61299-6000.
We will send you a reply.
1-3. DESTRUCTION OF ARMY MATERlALS TO PREVENT ENEMY USE. Refer to
TM 750-244-3 and TM 750-244-1-4 for procedures concerning the destruction of this material.
SECTION II
EQUIPMENT DESCRIPTION AND DATA
1-5. EQUIPMENT CHARACTERISTICS,
CAPABILITIES, AND FEATURES.
a. Port Identification. Purging and charging ports of
new production and overhauled fire control instruments are
color coded. The color code system provides for painting
of a gray band around the inlet port and a yellow band
around the outlet port.
b. Port Location. Illustrations for fire control instruments that are purged and charged in this manual are included to show the location of inlet and outlet ports as well
as associated hardware.
1-6. SAFETY, CARE, AND HANDLING.
The following safety precautions are listed for the protection of personnel performing the procedures contained in
this manual.
a. First Aid. Serious injury may occur at any time
during the performance of these procedures. Prior to performing the work requirements, personnel should familiarize themselves with first aid information contained in
FM21-11.
b. Compressed Gas. Compressed nitrogen gas is
used for purging and charging. Death or severe injury may
result if personnel fail to observe safety precautions.
1-1
TM 750-116
HANDLE WITH CARE. IN THE
EVENT THE RADIOLUMINOUS SOURCE
IS BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
CONTACT THE BASE SAFETY OFFICE
FOR THE NAME AND TELEPHONE
NUMBER OF YOUR LOCAL RPO:
LOCAL RPO:
TELEPHONE:
(1) Safety Procedures for Nuclear Regulatory
Commission (NRC) Licensed Tritium Fire Control
Devices.
(a) Purpose: To implement mandatory license requirements for use and maintenance of tritium radioluminous fire control instruments used on howitzers, mortars,
tanks, and rifles.
(b) Scope: This procedure is applicable to all personnel working with tritium devices, including organizational,
direct support, general support maintenance and operator
levels.
(c) Radiological Hazard: The beta radiation
emitted by tritium presents no external radiation hazard.
However, if taken internally, it can damge soft tissue. If a
capsule is broken, the tritium gas will dissipate into the surrounding air and surfaces near the vicinity of the break may
become contaminated. Tritium can be taken into the body
by inhalation, ingestion, or percutaneous (skin) absorption/
injection.
(2) Safety Precautions.
(a) Check for illumination in low light or darkroom
prior to use or service. If not illuminated, do not repair.
Double wrap the entire instrument in plastic (item 1, appx
B) and notify the local RPO.
(b) Removal of the radioluminous source from the
instrument is prohibited except at authorized depots. No
eating, drinking, smoking or applying cosmetics will be
allowed in tritium device work areas.
1-2
(3) Emergency Procedures. If a tritium source
breaks, inform other personnel to vacate the area or move
upwind. If skin contact is made with any area contaminated
with tritium, wash immediately with nonabrasive soap and
water. Report the incident to the local RPO. Actions below
will be taken under supervision or direction of the local
RPO.
(a) Personnel handling the instrument should wear
rubber or latex gloves. Instrument must be immediately
double wrapped in plastic (item 1, appx B), sealed, packaged and evacuated to depot. Outside package must be
identified as "Broken Tritium Device - Do Not Open."
Dispose of used gloves as radioactive waste per instructions
from local RPO and wash hands well.
(b) Personnel who may have handled the broken
tritium instrument should report to health clinic for tritium
bioassay. Optimum bioassay sample is at least four hours
after exposure.
(c) Broken tritium sources indoors may result in
tritium contamination in the area, such as workbench or
table. The area must be cordoned off, restricted until wipe
tests indicate no contamination.
(4) Further Information.
(a) Requirements for safe handling, maintenance,
storage and training are located in TM 9-254, General
Maintenance Procedures for Fire Control Materiel.
(b) If assistance is needed, contact your local or major command (MACOM) safety office(s) for information on
safe handling, shipping, storage, maintenance, or disposal
of radioactive instruments.
(c) The licensee/AMCCOM RPO may be contacted
by writing to Commander, U.S. Army Armament, Munitions and Chemical Command (AMCCOM), ATTN:
AMSMC-SFS, Rock Island, IL 61299-6000, or telephone:
DSN 793-2965/2995, Commercial (309) 782-2965/2995,
Fax extension 2289, E-Mail [email protected] After work hours, the AMCCOM
RPO may be contacted through the staff duty office at DSN
793-6001, Commercial (309) 782-6001.
1-7. CORROSION PREVENTION AND
CONTROL (CPC). Corrosion Prevention and Control
(CPC) of Army materiel is a continuing concern. It is important that any corrosion problems with these items be
reported so that the problem can be corrected and improvements can be made to prevent the problem in future items.
While corrosion is typically associated with rusting of metals, it can also include deterioration of other materials such
as rubber and plastic. Unusual cracking, softening, swelling, or breaking of these materials may be a corrosion problem. If a corrosion problem is identified, it can be reported
using Standard Form 368, Product Quality Deficiency Report. Use of key words such as “corrosion,” “rust,” “deterioration,” or “cracking” will assure that the information is
identified as a CPC problem. The form should be submitted
to: Commander, U.S. Army Armament, Munitions and
Chemical Command, ATTN: AMSMC-QAD/Customer
Feedback Center, Rock Island, IL 61299-6000.
TM 750-116
CHAPTER 2
GENERAL PROCEDURES
2-1. SCOPE. This chapter describes genera!
procedures for the setup of purging and charging
equipment time cycles.
2-2. SETUP OF PURGING AND CHARGING
EQUIPMENT, (figs. 2-1 and 2-2).
a. Setup for Single Stage Fixture(fig. 2-1)
DO NOT DROP TANK OF COMPRESSED
NITROGEN GAS. WHEN USING IN CONFINED
AREAS, USE EXTREME CARE;
GAS COULD CAUSE ASPHYXIATION.
(2) Securely attach regulator to tank valve using appropriate adapter supplied with purging kit if
necessary.
(3) Securely attach hose assembly to the adapter.
NOTE
When using regulator 11729749, adapter
10917072-2 is required to connect hose assembly to
low pressure to low pressure port of regulator.
Figure 2-1.
(4) Close pressure regulator valve
counterclockwise (CCW) to the extreme closed
position.
(5) Open the nitrogen tank valve (CCW) slowly until
the maximum tank pressure is registered on the high
pressure gage.
NOTE
If pressure indicated is less than 100 psi, obtain
and use replacement tank.
(1) Obtain a tank of water pumped dry nitrogen and
remove threaded protective cover from the outlet of the
tank. Open tank valve momentarily to rid valve seat of
any foreign material.
(6) SIowly open pressure regulator valve clockwise
(CCW) until approximately 5 psi is registered on the low
pressure gage. Check for and eliminate any
interference; close pressure regulator valve (CCW).
(7) For bleed down procedures, refer to para 2-3a.
(1.1) Remove the adapter from the regulator
install tee into the regulator. Install valve relief into
tee in the 3 o’clock position. install the adapter into
tee in the 6 o’clock position.
Change
1
2-1
TM 750–116
b. Setup for Two Stage Fixture (fig. 2–2).
(7) Open test fixture valve(s) until test fixture gage(s)
indicate(s) proper pressure.
(8) Close manifold valve(s) and check pressure reading on test fixture gage(s) .
(9) Remove stopper(s) from outlet pipe(s). Open
manifold valve(s) and check the pressure on test fixture
gage(s). Adjust fixture valve(s) if necessary.
(10) Close manifold valve(s) and attach feeder tube(s)
to outlet pipe(s).
(11) For bleed down procedures, refer to para 2-3.b.
2-3. BLEED DOWN OF PURGING AND
CHARGING EQUIPMENT (fig. 2-1 and
2-2).
DO NOT REMOVE REGULATOR ASSEMBLY, ADAPTER, OR HOSE BEFORE
FIRST PERFORMING ENTIRE BLEED
DOWN PROCEDURE. INJURY COULD
RESULT FROM SUDDEN RELEASE OF
HIGH PRESSURE GAS.
Figure 2–2 Setup for Two–Stage Fixture,
PN 8565556
(1) Place a tank of dry nitrogen in a vertical position
in the back of the fixture so that the tank is lodged in the
structural steel “V” formation of the fixture and secure with
the strap and clamping screw arrangement provided.
(2) Secure regulator assembly to the tank. Make certain pressure regulator valve is turned counterclockwise
(CCW) to off. Open nitrogen tank valve (CCW) until maximum tank pressure is registered on the high pressure gage.
NOTE
If pressure indicated is less than 100 psi, obtain
and use a replacement tank.
(3) Connect hose assembly to regulator assembly.
Open manifold valve.
a. Bleed Down for Single Stage Fixture (fig.
2–1).
(1) Close pressure regulator valve counterclockwise
(CCW).
(2) Close tank valve clockwise (CW).
(3) Slowly open pressure regulator valve (CW) until
low pressure gage and high pressure gage both indicate
zero.
(4) Close pressure regulator valve (CCW).
Pressure regulator valve should be left in the
closed position when not in use. Leaving
valve in the open position could damage
regulator diaphragm.
b. Bleed Down for Two Stage Fixture (fig. 2-2).
(1) Close pressure regulator valve and test fixture
valve(s) counterclockwise (CCW).
(2) Close tank valve clockwise (CW).
At no time should the pressure be permitted
to exceed 15 psi. Pressure greater than 15 psi
could damage the unit.
(4) Open transfer valve by pulling it to the outermost
position.
(3) Open transfer valve by pulling it to the outermost
position.
(4) Rotate pressure regulator valve CW until low pressure gage indicates 15 psi.
(5) Close test fixture valve(s) and ensure low pressure
gage indicates 0 psi.
(5) With manifold valve(s) open, slowly rotate test
fixture valve(s) CW until low pressure gage, high pressure
gage and test fixture gage(s) indicate zero.
(6) Open pressure regulator valve clockwise (CW)
until low pressure gage indicates 15 psi.
(6) Close pressure regulator valve and test fixture
valve(s) CCW.
2-2
TM 750-116
2-5. PURGING AND CHARGING PROCEDURES.
Pressure regulator valve and test fixture
valve(s) should be left in the closed position
when not in use. Leaving valves open could
result in damage to unit diaphragms.
a. Purge and Charge: Inlet Port Entry, Relief
Valve Exit. This procedure is used when instrument is
designed to hold a charge.
2-4. TIME CYCLES.
a.
Maintenance personnel will purge and charge tank
fire control items every 180 days and artillery fire control
items every 90 days or when condensation is evident in the
instrument.
NOTE
The 180-day cycle does not apply to rangefinders
which are purged and charged once a year. However, a visual inspection is required every 90 days
for evidence of moisture. The electrical components of M21 Ballistic Computer System to include the Ammo Select Unit, Cant Angle Sensor,
Computer Unit, Output Unit and Rate Tachometer and the Laser Rangefinder, AN/VVG–2, Electronics Unit require purging every 180 days,
when unit is opened for maintenance, or when evidence of moisture is present.
b. Maintenance personnel will purge and charge fire
control materiel being repaired whenever the repair function affects internal sealing.
c. For maintenance of material in storage refer to applicable equipment manuals.
d. NSN’s 4820-01-384-9005 and 4730-00-277-9615
are mandatory for purging artillery fire control.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
WRAP DEVICE IN PLASTIC AND
NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
(1) Remove inlet port cap of instrument to be purged
and charged.
(2) Inspect inlet port for cleanliness and presence of
valve core. Remove any dirt or foreign matter.
Ensure regulator valve is closed (counterclockwise - CCW) or damage may occur to
regulator.
To avoid damage to instruments being
purged and charged, do not exceed maximum pressure. Unless otherwise noted for
specific instrument, maximum pressure is 10
psi.
(3) Connect hose assembly to inlet pert on instrument.
(4) Open main valve on nitrogen tank (CCW).
(5) Open regulator valve (clockwise - CW) until specified purge pressure is indicated on low pressure gage.
(6) Watch low pressure gage and listen for purge relief
valve to open.
(a) Relief valve should open between specified
pressures.
(b) If relief valve does not open before pressure
reaches maximum range, immediately turn off regulator
valve (CCW). Replace pressure relief valve on instrument.
Repeat procedure.
Change 1 2-3
TM 750–116
(7) Purge instrument for specified time. If moisture
is still present, a longer purge time may be required.
(8) Close the regulator valve (CCW).
b. Purge and Charge - Inlet Port Entry, Outlet
Port Screw(s) This procedure is used when instrument
is designed to hold a charge.
(9) Watch low pressure gage and listen for purge relief valve to close.
(a) Relief valve should close at specified pressure.
(b) If pressure relief valve does not close before
reaching the lowest pressure indicated, replace the pressure
relief valve and repeat procedure.
(10) Leak test by allowing instrument to stand for
specified time.
(a) Watch low pressure gage for indication of nitrogen leaks. (Low pressure gage will indicate decreasing
pressure.) If no leak is indicated, go to step 11.
(b) If pressure reduces, perform leak check:
— Apply a soap solution to all sealed joints and
screws.
— Open regulator valve (CW) until specified
pressure registers on low pressure gage.
— When pressure relief valve opens, close regulator valve (CCW).
— Watch for bubbles to appear around seals and
screws.
— Refer to appropriate maintenance manuals to
replace defective seals.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
WRAP DEVICE IN PLASTIC AND
NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
(1) Remove inlet port cap of instrument to be purged
and charged.
(2) Inspect valve stem for cleanliness and presence of
valve core. Remove any dirt or foreign matter.
— When defective seals are replaced, repeat
purge and charge procedure.
(11) If no leaks are found on instrument, perform leak
test on purge kit and hose connection while still connected
to instrument. Repeat procedure until all leaks are eliminated.
(12) Remove hose assembly.
(13) Close main tank valve (CW). Apply soap solution to the valve core. If a Ieak is found, replace valve core
of instrument and repeat purge and charge procedure.
(14) Install inlet port cap on instrument.
(15) For bleed down procedures, refer to para 2-3.
2-4
Ensure regulator valve is closed (counterclockwise - (CCW) or damage may occur to
regulator.
To avoid damage to instruments being
purged and charged, do not exceed maximum pressure. Unless otherwise noted for
specific instrument, maximum pressure is 10
psi.
(3) Connect hose assembly to valve stem on instrument.
(4) Open main valve on nitrogen tank (CCW).
(5) Remove outlet port screw(s) (unless otherwise
directed for specific instrument) and any accompanying
gasket/preformed packing.
(6) Open regulator valve clockwise (CW) until specified purge pressure is indicated on low pressure gage.
(7) Watch low pressure gage and listen for gas escaping from outlet port. Do not allow pressure to exceed maximum specified pressure.
(8) Purge instrument for specified time. If moisture
is still present, a longer purge time may be required.
(9) Reduce pressure to 1 psi.
TM 750-116
(10) Check outlet port screw to ensure seal on screw
is serviceable. Replace self-sealing screw if necessary. If
other than self-sealing screw is used, sealing compound,
(item 6, appx B, unless otherwise specified) must be applied
to screw before installing.
c. Purge Only, Inlet Port Entry, Outlet Port
Screw. This procedure is used when instrument does not
hold a charge.
(11) Install outlet port screw(s) and any accompanying gasket/preformed packing.
(12) Increase pressure to specified charge pressure for
specified time.
(13) Close regulator valve (CCW).
(14) Leak test by allowing instrument to stand for
specified time.
(a) Watch low pressure gage for indication of nitrogen leaks (low pressure gage will indicate decreasing pressure). If no leaks occur, proceed to step 15.
(b) If pressure reduces, perform leak check:
- Apply a soap solution to all sealed joints and
screws.
- Open regulator valve (CW) to increase internal
pressure to instrument’s charge pressure.
- Close regulator valve (CCW).
- Watch for bubbles to appear around seals and
screws.
- Refer to appropriate maintenance manuals to
replace defective seals.
- When defective seals are replaced, repeat
purge and charge procedure.
(15) If no leaks are found on the instrument, perform
a leak test on the purge kit and hose connection while still
connected to the equipment. Repeat procedure until all
leaks are eliminated.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
(1) Remove inlet port cap from instrument to be
purged.
(2) Inspect inlet port for cleanliness and presence of
valve core. Remove any dirt or foreign matter.
Ensure regulator valve is closed (counterclockwise - CCW) or damage may occur to
regulator.
(16) Remove hose assembly.
(17) Close main tank valve (CW). Apply soap solution to valve core. If a leak is found, replace valve core of
instrument and repeat purge and charge procedure.
(18) Install inlet port cap on instrument.
(19) For bleed down procedures, refer to para 2-3.
To avoid damage to instruments being
purged, do not exceed maximum pressure.
Unless otherwise noted for specific instrument, maximum pressure is 10 psi.
(3) Connect hose assembly to inlet port valve stem on
instrument.
(4) Open main valve on nitrogen tank (CCW).
(5) Remove outlet port screw (unless otherwise directed for specific instrument) with any accompanying gasket/preformed packing.
(6) Open regulator valve (clockwise - CW) until specified purge pressure is indicated on low pressure gage.
(7) Watch low pressure gage and listen for gas escaping from outlet port. Do not allow pressure to exceed maximum specified pressure.
(8) Purge instrument for specified time. If moisture is
still present, a longer purge time may be required.
(9) Close the regulator valve (CCW).
2-5
TM 750-116
(10) Check outlet port screw to ensure seal on screw
is serviceable. Replace self-sealing screw if necessary. If
other than self-sealing screw is used, sealing compound
(item 6, appx B, unless otherwise specified) must be applied
to screw before installing.
(11) Install outlet port screw with any accompanying
gasket/preformed packing.
Ensure regulator valve is closed (counterclockwise - CCW) or damage may occur to
regulator.
(12) Remove hose assembly.
(13) Install inlet port cap.
(14) For bleed down procedures, refer to para 2-3.
d. Purge Only - Inlet Port Screw, Outlet Port
Screw(s). This procedure is used when instrument does
not hold a charge.
To avoid damage to instruments being
purged, do not exceed maximum pressure.
Unless otherwise noted for specific instrument, maximum pressure is 10 psi.
(3) Install specified purge adapter in inlet port.
(4) Connect hose assembly to purge adapter on the
instrument.
(5) Open main valve on nitrogen tank (CCW).
(6) Remove outlet screw(s) (unless otherwise directed
for specific instrument) and any accompanying gasket/preformed packing.
(7) Open regulator valve (clockwise - CW) until
specified purge pressure is indicated on low pressure gage.
(8) Watch low pressure gage and listen for gas escaping from outlet port(s). (Do not allow pressure to exceed
maximum specified pressure.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
(1) Remove inlet port screw from instrument to be
purged.
(2) Inspect inlet port for cleanliness. Remove any dirt
or foreign matter.
2-6
(9) Purge instrument for specified time. If moisture is
still present, a longer purge time may be required.
(10) Close the regulator valve (CCW).
(11) Check inlet and outlet port screws to ensure
seals on screws are serviceable. Replace self-sealing
screws if necessary. (If other than self-sealing screws are
used, sealing compound (item 6, appx B, unless otherwise
specified) must be applied to screw before installing.
(12) Install outlet screw(s) and any accompanying
gasket/preformed packing (if required).
(13) Remove hose assembly and adapter.
(14) Install inlet screw.
(15) For bleed down procedures, refer to para 2-3.
TM 750-116
CHAPTER 3
PURGING AND CHARGING SPECIFIC INSTRUMENTS
SECTION I
GENERAL INFORMATION
3-1. SCOPE.
a. This chapter presents purging, charging, and leak
testing pressures and times for specific fire control instruments. Refer to paragraph 2-2 for initial setup information
and paragraph 2-5 for general purging and charging procedures.
b. Also included are instructions for separation of major assemblies, leak checking pressures, time durations, use
of inlet port adapters, and any specific notes, cautions or
warnings applicable to the specific instrument. Each procedure refers to a partially exploded illustration showing location of inlet and outlet ports.
c. For presentation purposes, specific instrument procedures are arranged in categories: Aiming Circle, Alinement
Devices, Binoculars, Collimators, Computers, Mounts,
Periscopes, Quadrants, Rangefinders, Sights, Telescopes,
and Reticle Projector Unit. Under each of these categories
the specific instruments are listed alphanumerically.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
NOTE
If the outlet port screw or purging inlet screw is
lost or damaged, replace with the appropriate
screw as listed in Appendix C or in appropriate
technical manual.
The soap solution used in general procedures in
chapter 2 is a mixture of soap (item 7, appx B) and
water. Leak-Tee may also be used if available.
3-1
TM 750-116
SECTION II
SPECIFIC INSTRUMENTS
g. Purge instrument at 5 psig for 5 minutes.
DO NOT EXCEED THE PRESSURES INDICATED THROUGHOUT THE FOLLOWING PROCEDURES.
h. Remove adapter assembly and install self-sealing
screw (2).
i.
Elevate elbow telescope to about 800 mils.
j. Install self-sealing screw (1).
3-2. AIMING CIRCLE, M2A2 (fig. 3-1).
SELF-SEALING
SCREW
SELF-SEALING
SCREW
k. Return elbow telescope to zero mils.
3-3. BINOCULAR, M19 (fig. 3-2)
NOTE
Both sides of the binocular must be purged individually. Repeat procedure para 2-5.d. for both
sides.
Figure 3-1 M2A2 Aiming Circle
a.
Perform purging procedure para 2-5.d.
b. Depress elbow telescope to about 400 mils.
c. Remove self-sealing screw (1).
d. Elevate elbow telescope until self-sealing screw (2)
is accessible.
e.
Remove self-sealing screw (2).
NOTE
On aiming circle with only one self-sealing
screw, remove one of the reticle setscrews to
purge. Apply sealing compound (item 6, appx B)
to setscrew to reinstall.
f. Install adapter assembly with 8-32 UNC-2A
threads.
3-2
Figure 3-2 M19 Binocular
a.
Perform purging procedure para 2-5.d.
b. Purge instrument at 5 psig for 5 minutes.
TM 750-116
NOTE
3-4. COLLIMATOR, M1A1 (fig. 3-3).
For sealing the collimator, the two stage fixture
is required (refer to para 2-2.b.). For regular
purging and charging, the single stage fixture may
be used (refer to para 2-2.a.).
a.
Perform purging and charging procedure para 2-5.b.
b.
Purge instrument at 3 psig for 5 minutes.
c. Check to be sure nitrogen is escaping from both outlet ports.
d. Charge instrument at 3 psig maintaining pressure for
10 seconds.
e.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
Leak test for a minimum of 5 minutes.
f.
Remove hose assembly and release all pressure by
depressing inlet port valve stem.
g. Reconnect hose assembly and charge instrument at 1
psig for 10 seconds.
h. Install inlet port cap.
3-5. COMPUTER, M21 ELECTRONIC
(figs. 3-4 through 3-9).
a. Ammo Select Unit - two each (fig. 3-4).
......
\
Figure 3-4 Ammo Select Unit
Figure 3-3 M1A1 Collimator
NOTE
Actual location of outlet port screws may vary
from location shown in illustration due to colimator adjustments.
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge each unit at 8 psig for 5 minutes.
(3) Charge each unit at 1 psig maintaining pressure
for 10 seconds.
(4) Leak test for a minimum of 5 minutes.
3-3
TM 750-116
b. Cant Angle Sensor (fig. 3-5). Refer to para
3-5.a for procedures.
d. Gunner’s Control Unit (fig. 3-7).
para 3-5.a. for procedures.
Refer to
Figure 3-5 Cant Angle Sensor
c. Computer Unit (fig 3-6). Refer to para 3-5.a.
for procedures.
Figure 3-7 Gunner’s Control Unit
e. Output Unit (fig. 3-8). Refer to para 3-5.a. for
procedures.
Figure 3-6 Computer Unit
Figure 3-8 Output Unit
3-4
TM 750-116
f. Rate Tachometer (fig. 3-9). Refer to para 3-5.a.
for procedures.
Figure 3-10 M139/M140 Alinement Device
Figure 3-9 Rate Tachometer
a. Perform purging and charging procedure para
2-5.b.
b.
c.
3-6. DEVICE, ALINEMENT, M139/M140,
(fig. 3-10).
Purge instrument at 7 psig for 5 minutes.
Charge instrument at 1 psig maintaining pressure
for 10 seconds.
d. Leak test for minimum of 5 minutes.
3-7. DEVICES, BORESIGHT.
a. M26/M27 Boresight (fig. 3-11).
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
Figure 3-11 M26/M27 Boresight Device
(1) Remove the rubber protective head cover.
3-5
TM 750-116
NOTE
Some early manufacture boresight inlet ports
were equipped with metric threads. To attach the
hose asembly to these units, it is necessary to use
the 10-32 adapter supplied with the purging kit.
Insert the adapter carefully and do not force the
adapter past its binding point.
3-8. MOUNTS, TELESCOPE.
a. Telescope Mount, M137 (fig. 3-13).
(2) Perform purging procedure para 2-5.d.
(3) Purge instrument at 5 psig for 5 minutes.
(4) Install the rubber protective head cover on the
boresight.
b. M26A1/M27A1 Muzzle Boresight (fig. 3-12).
Figure 3-13 M137 Telescope Mount
(1) Perform purging procedure para 2-5.c.
(2) Purge instrument at 5 psig for 5 minutes.
b. Telescope Mount, M145/M145A1 (fig. 3-14).
Figure 3-12 M26A1/M27A1 Muzzle Boresight
(1) Release pressure from optical unit by removing
pneumatic inlet port cap and depressing valve core .
(2) Attach hose assembly to angle valve (special tool,
TM9-4933-259-14&P) and install angle valve on inlet
port.
(3) Turn angle valve T clockwise (CW) until snug.
(4) Perform purging and charging procedure para
2-5.b.
(5) Purge instrument at 5 psig for 5 minutes or until
all traces of moisture in optical unit are removed.
(6) Charge instrument at 3 psig maintaining pressure
for 10 seconds.
(7) Turn angle valve T counterclockwise (CCW) until
snug.
(8) Remove hose assembly and angle valve from inlet
port core.
(9) Leak test for minimum of 5 minutes.
3-6
Figure 3-14 M145/M145A1 Telescope Mount
(1) Perform purging procedure para 2-5.c.
(2) Purge instrument at 5 psig for 5 minutes.
TM 750-116
c. Telescope Mount, M149/M149E1 (fig. 3-15).
d. Telescope, Mount, M187 (fig. 3-16).
NOTE
Mount must be removed from installed position
for purging and charging operations. Refer to appendix A for a listing of applicable publications.
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
Figure 3-15 M149/M149E1 Telescope Mount
(1) Remove inlet port cap and outlet screw on M149
Telescope Mount. Do not remove poppet valve on M149E1
Telescope Mount.
(2) Perform purging and charging procedure para
2-5.b for M149 and para 2-5.a for M149A1.
(3) Purge M149 Telescope Mount at 5 psig and
M149E1 Telescope Mount at 3 psig. Maintain pressure for
10 minutes.
Figure 3-16 M187 Telescope Mount
(4) Charge instrument at 1 psig for 40 seconds.
(5) Leak test for a minimum of 5 minutes.
(1)
2-5.a.
(2)
Perform purging and charging procedure para
Relief valve should open between 3-10 psig.
(3)
(4)
Purge instrument for 5 minutes.
Relief valve should close between 1-5 psig.
(5)
Leak test for minimum of 5 minutes.
3-7
TM 750-116
3-9. PERISCOPE, M65 BATTERY COMMANDER’S (fig. 3-17).
NOTE
Both tubes of the Battery Commander’s Periscope must be purged and charged separately. Repeat procedure for each tube assembly.
Ensure that nitrogen is escaping from both outlet
ports before proceeding with charging procedures.
Figure 3-18 M28C Tank Periscope
Figure 3-17 M65 Battery Commander’s Periscope
a.
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 10 minutes.
(3) Charge instrument at 1 psig maintaining pressure
for 10 seconds.
(4) Leak test for minimum of 5 minutes.
b. Periscope, M30C Tank (fig. 3-19).
NOTE
The periscope must be removed from installed
position for purging and charging operations.
Refer to appendix A for a listing of applicable
publications.
Perform purging and charging procedure para 2-5.b.
b. Purge instrument at 5 psig for 10 minutes.
c. Charge instrument at 1 psig maintaining pressure for
20 seconds.
d. Leak test for minimum of 5 minutes.
3-10. PERISCOPES, TANK.
a. Periscope, M28C Tank (fig. 3-18).
NOTE
The eyeshield must be removed to provide access
to outlet screw.
3-8
Figure 3-19 M30C Tank Periscope
TM 750-116
(1) Perform purging and charging procedure para
2-5.b.
(1) Head Assembly (fig. 3-20).
(2) Purge instrument at 5 psig for 10 minutes.
(3) Charge instrument at 1 psig maintaining pressure
for 20 seconds.
(4) Leak test for minimum of 5 minutes.
c. Periscope, M32E1 Tank (figs. 3-20 through
3-22).
ENSURE THAT 1.5V-OFF-24V SWITCH
ON BOTTOM OF THE INFRARED BODY
ASSEMBLY IS SET TO OFF; THIS UNIT
CARRIES 16,000 VDC.
Do not purge and charge the infrared body
assembly in bright light; prolonged exposure
can cause damage to the image conversion
tube.
NOTE
Periscope must be removed from installed position for purging and charging operations. Refer
to appendix A for listing of applicable public a-
Figure 3-20 M32E1 Head Assembly
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(c) Charge instrument at 1 psig maintaining pressure
for 10 seconds.
(d) Leak test for minimum of 5 minutes.
3-9
TM 750-116
(2) Daylight Body Assembly (fig. 3-21).
NOTE
The daylight body assembly must be removed
from head assembly for purging and charging
operations. Refer to appendix A for a listing of
applicable publications.
(3) Passive Elbow Assembly (fig. 3-22).
NOTE
The passive elbow assembly must be removed
from head assembly for purging and charging
operations. Refer to appendix A for a listing of
applicable publications.
NOTE: TWO VIEWS SHOWN FOR CLARITY
Figure 3-22 M32E1 Passive Elbow Assembly
Figure 3-21 M32E1 Daylight Body Assembly
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(c) Charge instrument at 1 psig maintaining pressure
for 20 seconds.
(d) Leak test for a minimum of 5 minutes.
3-10
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(c) Charge instrument at 1 psig maintaining pressure
for 20 seconds.
(d) Leak test for minimum of 5 minutes.
d. Periscope, M32CE1 Tank (figs. 3-20 through
3-22. Refer to para 3-10.c. for procedures.
e. Periscope, M35E1 Tank (figs. 3-20 through
3-22). Refer to para 3-10.c. for procedures.
TM 750-116
f. Periscope, M36 Tank (figs. 3-23 through
3-26).
ENSURE THAT 1.5-OFF-24V SWITCH
ON THE BOTTOM OF THE INFRARED
BODY ASSEMBLY IS SET TO OFF; THIS
UNIT CARRIES 16,000 VDC.
(2) Daylight Body Assembly (fig. 3-24).
NOTE
The daylight body assembly and the infrared
body assembly must be removed from the head
assembly for purging and charging procedures.
Refer to appendix A for a listing of applicable
publications.
Do not purge and charge the infrared body
assembly in bright light; prolonged exposure
can cause damage to the image conversion
tube.
NOTE
The periscope must be removed from the installed position for purging and charging operations. Refer to appendix A for a listing of
applicable publications.
(1) Head Assembly (fig. 3-23).
Figure 3-24 M36 Daylight Body Assembly
Figure 3-23 M36 Head Assembly
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(c) Charge instrument at 1 psig for 10 seconds.
(d) Leak test for minimum of 5 minutes.
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(C) Charge instrument at 1 psig for 20 seconds.
(d) Leak test for a minimum of 5 minutes.
3-11
TM 750-116
(3) Infrared Body Assembly (fig. 3-25).
NOTE
(4) Passive Elbow Assembly (fig. 3-26). Refer to para 3-10.f.(3) for procedures.
The infrared body assembly must be removed
from the head assembly for purging and charging operations. Refer to appendix A for a listing of applicable publications.
NOTE: TWO VIEWS SHOWN FOR CLARITY
Figure 3-26 M36 Passive Elbow Assembly
NOTE: TWO VIEWS SHOWN FOR CLARITY
Figure 3-25 M36 Infrared Body Assembly
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 8 psig for 5 minutes.
(c)
(d)
Charge instrument at 1 psig for 20 seconds.
Leak test for a minimum of 5 minutes.
g. Periscope, M36E1 Tank (figs. 3-23 through
3-26). Refer to para 3-10.f. for procedures.
h. Tank Periscope, M42 Tank (fig. 3-27).
NOTE
Early, later, and modified production periscopes
must be removed for purging and charging procedures. Refer to appendix A for a listing of
applicable publications.
(1) Early Production (fig. 3-27).
Figure 3-27 M42 Tank Periscope - Early Production
(a) Perform purging procedure para 2-5.d.
(b) Purge instrument at 5 psig for 5 minutes.
3-12
TM 750-116
(2) Late Production (fig. 3-28).
Periscope, M44A Tank (figs. 3-30 through
i.
3-32.
ENSURE THAT THE VEHICLE MASTER
SWITCH AND THE PERISCOPE EMERGENCY SWITCH ARE IN THE OFF POSITION. THE HIGH VOLTAGE AND LOW
AMPERAGE OF THE POWER PACK IS
NOT DANGEROUS; HOWEVER, IF THE
HIGH VOLTAGE PARTS ARE TAMPERED WITH, AN ELECTRICAL SHOCK
MAY RESULT.
Do not expose periscope to bright light; prolonged exposure may cause damage to image
conversion tube.
NOTE
Special plate assemblies are provided for purging and charging when the head assembly and
body assembly are separated. These plates are
also used for shipment and storage of the periscope.
Figure 3-28 M42 Tank Periscope - Late Production
(a) Perform purging and charging procedure para
2-5.b.
(b) Purge instrument at 5 psig for 5 minutes.
(1) Purging and Charging in the Installed Position (fig. 3-30).
(c) Charge instrument at 1 psig for 10 seconds.
(d)
Leak test for minimum of 5 minutes.
(3) Modified Production (fig. 3-29). Refer to
para 3-10.h.(2) above for procedures.
Figure 3-30 M44A Series Tank Periscope
(a) Perform purging and charging procedure para
2-5.b.
Figure 3-29 M42 Tank Periscope - Modified
Production
(b) Purge instrument at 5 psig for 10 minutes.
(c) Charge instrument at 1 psig for 20 seconds.
(d) Leak test for minimum of 5 minutes.
3-13
TM 750-116
(2) Purging and Charging the Head Assembly (fig. 3-31).
NOTE
Install plate 10542087 before performing purging
and charging procedures.
(3) Purging and Charging the Body Assembly
(fig. 3-32).
NOTE
Mount plate 10549705 before proceeding with
purging and charging operations.
Figure 3-32 M44A Body Assembly
(a) Perform purging and charging procedure para
2-5.b.
Figure 3-31 M44A Head Assembly
(b) Purge instrument at 5 psig for 10 minutes.
(C) Charge instrument at 1 psig for 20 seconds.
(a)
2-5.b.
Perform purging and charging procedure para
(b)
Purge instrument at 5 psig for 10 minutes.
(c)
Charge instrument at 1 psig for 20 seconds.
(d)
Leak test for minimum of 5 minutes.
3-14
(d) Leak test for minimum of 5 minutes.
j. Periscope, M44A2 Tank (figs. 3-30 through
3-32). Refer to para 3-10.i. for procedures.
k. Periscope, M44A3 Tank (figs. 3-30 through
3-32). Refer to para 3-10.i. for procedures.
TM 750-116
l. Periscope, M44A4 Tank (figs. 3-30 through
3-32). Refer to para 3-10.i. for procedures.
p. Periscope M48 Tank (fig. 3-34).
m. Periscope, M44A1E1 Tank (figs. 3-30
through 3-32). Refer to para 3-10.i. for procedures.
ENSURE THAT VEHICLE MASTER
SWITCH IS IN OFF POSITION. THE
HIGH VOLTAGE AND LOW AMPERAGE
OF THE POWER PACK IS NOT DANGEROUS; HOWEVER, IF THE HIGH
VOLTAGE PARTS ARE TAMPERED
WITH, AN ELECTRIC SHOCK CAN RESULT.
n. Periscope, M44A2E1 Tank (figs. 3-30
through 3-32). Refer to para 3-10.i. for procedures.
o. Periscope, M47 Tank (fig. 3-33).
NOTE
The periscope body assembly must be separated
from the head assembly or removed from storage for purging and charging procedures. Refer
to appendix A for a listing of applicable publications.
Do not purge and charge the infrared body
assembly in bright light; prolonged exposure
may cause damage to the image conversion
tube.
NOTE
The periscope body assembly must be separated
from the head assembly or removed from vehicle storage for purging and charging procedures. Refer to appendix A for a listing of
applicable publications.
Figure 3-33 M47 Tank Periscope Body Assembly
Figure 3-34 M48 Periscope Body Assembly
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 5 minutes.
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 1 psig for 10 seconds.
(3) Charge instrument at 1 psig for 10 seconds.
(4) Leak test for minimum of 5 minutes.
(4) Leak test for minimum of 5 minutes,
3-15
TM 750-116
q. Periscope, M901 (fig 3-35).
NOTE
Desiccant must be replaced every time unit is
purged. Do not check pressure at any time other than during the pressurizing cycle. Loss of
pressure resulting from such attempts will
shorten the time between maintenance actions.
Refer to appendix A for listing of applicable
publications.
(1) Upper Section.
(l) Close nitrogen tank supply valve (CW) and remove hose assembly. Install dust cap on filler valve.
Ambient Air Temperature List
Air Temp.
Pressurize to:
Above +110°F (43°C)
4.0 psig
+85°F to +110°F (25°C to 43°C)
3.0 psig
+55°F to +85°F (13°C to 29°C)
2.0 psig
+30°F to +55°F (-1°C to 13°C)
1.0 psig
+5°F to +30°F (-15°C to -l°C)
0.5 psig
Below +5°F (-15°C)
0 psig
Pressurizing in excess of 10 psig (68.95 kPa)
can cause damage to seals.
(a) Remove desiccator by unscrewing container part
(hex head) from tank periscope body.
(b) Hold container part upright and remove slotted
cap of desiccator by turning counterclockwise using screwdriver and discard old desiccant.
To prevent damage to tank periscope, purge
charging lines by blowing pressurized nitrogen through lines. This will remove any contamination in lines.
(c) Close pressure regulator valve (CCW). Open
nitrogen tank valve and observe nitrogen tank pressure
gauge, indicating tank is pressurized.
(d) Remove dust cap on filler valve. Install hose
assembly and loosen self-sealing screws in both upper and
lower sections.
(e) Open pressure regulator valve (CW) to purge
pressure of 4-5 psig (27.5 to 34.4 kPa) on low pressure
gage. Check that nitrogen is being discharged from selfsealing screw holes.
(f) Alternately open and close self-sealing screw
holes so one hole is open and another is closed every 15
minutes.
(g) Purge until humidity indicator is blue (approximately 30 minutes).
(h) Close pressure regulator valve (CCW).
Figure 3-35 M901/M981 Tank Periscope
(2) Lower Section.
Pressurizing assemblies in excess of 10 psig
(68.95 kPa) can cause damage to seals.
(a) Remove desiccant cap and old desiccant from
desiccant container and install desiccant cap.
(b) Close pressure regulator valve (CCW). Open
main valve on nitrogen tank and observe nitrogen tank pressure gage indicating tank is pressurized.
(i) Remove desiccator from tank periscope body.
Remove slotted cap and install new desiccant.
(c) Remove dust cap on filler valve and install valve
extension and hose.
(j) Lubricate preformed packing on desiccant cap
lightly with grease or silicone compound and install cap and
desiccator. Torque cap to 20 to 30 in lb. (2 to 3 Nm).
(d) Remove l/4-inch upper and lower self-sealing
screws.
(k) Slowly open pressure regulator valve (CW) and
pressurize upper section for 10 seconds to value given below for ambient air temperatures.
3-16
(e) Open pressure regulator valve (CW) to purge
pressure of 4-5 psig (27.5 to 34.4 kPa) on low pressure
gage.. Check that nitrogen is being discharged from selfsealing screw holes.
TM 750-116
(f) Alternately open and close self-sealing screw
holes so one hole is open and other is closed every 15 minutes.
(g) Purge until humidity indicator is blue. During
purge, lubricate self-sealing screw preformed packing lightly with silicone compound.
c. Quadrant, M15 (figs. 3-37 and 3-38).
NOTE
For old configuration units, refer to figure 3-37.
New configuration units are illustrated in figure
3-38.
(h) Close pressure regulator (CCW) and reinstall
two self-sealing screws.
(i) Remove desiccant cap and insert new desiccant
from sealed package immediately into desiccant container.
(j) Lubricate preformed packing on desiccant cap
lightly with grease or silicone compound and reinstall cap.
Torque cap to 20 to 30 lb in. (2 to 3 Nm).
(k) Slowly open regulator valve (CW) and charge
lower section for 10 seconds to value given in ambient air
temperature chart in para 3-10.q.
(l) Close nitrogen tank valve. Remove hose and
valve extension and install dust cap.
r. Periscope, M981 Tank (fig. 3-35). Refer to
para 3-10.q.. for procedures.
3-11. Quadrants.
a. Quadrant, M14 (fig. 3-36).
Figure 3-37 M15 Quadrant - Old Configuration
(1) Perform purging procedure para 2-5.d.
(2) Purge instrument at 5 psig for 5 minutes.
Figure 3-36 M14 and M14A1 Quadrants
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 1 psig for 10 seconds.
(4) Leak test for minimum of 5 minutes.
Figure 3-38 M15 Quadrant - New Configuration
b. Quadrant, M14A1 (fig. 3-36). Refer to para
3-11.a. for procedures.
3-17
TM 750-116
d. Quadrant, M17, (fig. 3-39).
NOTE
While purging the quadrant, ensure the pressure
relief valve is working by checking for nitrogen
gas escaping from the valve.
3-12. RANGEFINDERS.
a. Laser.
(1) Optical Cavity (fig. 3-40).
NOTE
See appendix C for Service Kit containing replacement parts for M1 and M1A1 Tanks.
Figure 3-39 M17 and M18 Quadrants
(1) Perform purging and charging procedure para
2-5.a.
(2) Purge instrument at 7 psig for 5 minutes.
(3) Turn pressure regulator off (CCW) and note when
relief valve closes.
(4) If relief valve closes before reaching 1 psig, remove hose assembly and depress valve core until all pressure has escaped.
(5) Charge instrument at 1 psig for 60 seconds.
(6) Leak test for a minimum of 5 minutes.
e. Quadrant, M18 (fig. 3-39). Refer to para
3-11. d. for procedures.
3-18
Figure 3-40 Laser Rangefinder Optical Cavity
(a) Remove cover and check lens for cracks and
breaks. If damage is evident, do not attempt purging and
charging procedure.
(b) Perform purging procedure para 2-5.c.
(c) Remove inlet plug and preformed packing.
(d) Install valve extension on inlet port.
(e) Attach hose assembly to valve extension.
(f) Loosen, but do not remove sealing screw.
(g) Purge instrument at 5 psig for 5 minutes.
(h) While purging, leak test lens area.
(i) Remove hose assembly and valve extension from
inlet port.
(j) Reassemble by tightening sealing screw and installing cover.
(k) Install inlet port cap. Install inlet plug with preformed packing attached and outlet screw with preformed
packing attached.
TM 750-116
(2) Electronic Cavity (fig. 3-41).
NOTE
See appendix C for Service Kit containing replacement parts for M1 and M1Al Tanks.
(1)
Electronics Compartment.
(a)
Perform purging procedure para 2-5.d.
(b)
Purge electronics compartment at 8 psig for 5
minutes.
(2)
Receiver-Transmitter (R/T) Compartment.
Refer to para 4-12.b.(1) for procedures.
NOTE
Ensure nitrogen is escaping from the relief valve.
If not, repair as necessary.
(3) Optics Compartment. Refer to para
3-12.b.(1) for procedures.
(4) Laser Electronics Unit (fig. 3-43).
Figure 3-41 Laser Rangefinder Electronics Cavity
(a) Remove inlet screw with preformed packing
attached.
(b) Remove outlet screw with preformed packing
attached.
(c) Perform purging procedure para 2-5.d.
(d) Purge instrument at 5 psig for 5 minutes.
b. AN/VVG-2 Laser (fig. 3-42).
Figure 3-43 AN/VVG-2 Electronics Unit
(a) Perform purging procedure para 2-5.d.
Figure 3-42 AN/VVG-2 Receiver - Transmitter
(b) Purge instrument at 8 psig for 5 minutes.
3-19
TM 750-116
c. M17A1, M17B1C, and M17C, (figs. 3-44
through 3-46).
NOTE
Rangefinder end housings are purged and
charged on a yearly basis; however, they must
be visually inspected every 90 days.
(2) End Housing Assemblies (figs. 3-45 and
3-46).
NOTE
Blister and splatter shields must be removed for
end housing assembly purging and charging
procedures.
Some end housings have a relief valve instead
of an outlet screw. When there is a relief valve,
disregard the procedure that removes the outlet
screw.
Purging pressure for end housings with relief
valves must be increased to 8 psig to open the
relief valve and keep it open during purging.
Charging pressure for housings with relief
valves is the 5 psig at which the relief valve
seats.
Figure 3-44 M17A1 Body Assembly
(1)
Body Assembly (fig. 3-44)
Figure 3-45 M17A1 and M17C End Assembly
(a)
2-5.a.
Perform purging and charging procedure para
(b)
Purge instrument at 8 psig for 30 minutes.
(c)
Ensure relief valve closes at 5 psig.
(d)
Leak test for a minimum of 5 minutes.
3-20
(a) Remove inlet port cap and outlet screw with preformed packing attached.
(b) Perform purging and charging procedure para
2-5.b.
(c) Purge instrument at 5 psig for 5 minutes.
(d) Charge instrument at 1 psig for 10 seconds.
(e) Leak test for minimum of 5 minutes.
TM 750-116
NOTE
The end assembly for the M17BlC (fig. 3-46)
is purged and charged in the same manner as
the M17A1 and M17C with the exception of
removing two outlet screws instead of one.
Refer to para 3-12.c.(2) for procedures.
NOTE
The backup sight must be moved to gunner’s
position and the commander’s hatch cover
opened and secured before purging and charging. Refer to TM 9–2350-252-10-2.
(a) Perform purging and charging procedure para
2-5.b.
(b) Open valve stem (outlet screw) on outer head
assembly onlv three turns for purge procedure.
(c) Purge instrument at 5 psig for 5 minutes.
(d) Close valve stem (outlet screw) on outer head
assembly.
(e) Charge instrument at 5 psig.
(f) Leak test for minimum of 5 minutes.
(g) Close hatch and secure commander’s hatch cover.
(2) Integrated Sight Unit (figs. 3-48 and 3-49).
Figure 3-46 M17B1C End Assembly
3-13. SIGHTS.
a. BFV TOW/TOW2 SUBSYSTEM (M2, M3,
M2A1, M3A1, M2A2, AND M3A2 (figs. 3-47
through 3- 52).
(1) Backup Sight, PN 12316793, (fig. 3-47).
Figure 3-48 Integrated Sight Unit
ISU seals could rupture if pressure is too
high. Never let low pressure gage get higher
than 4 psig.
(a) Open and secure gunner’s hatch cover. (Refer to
TM 9-2350-252-l0-2 for M2, M3, M2A1, and M3A1 or
TM 9-2350-282-l0-2 for M2A2 and M3A2.)
Figure 3-47 Backup Sight, PN 12316793
(b) For M2, M3, M2A1, and M3A1 only, open sight
shield assembly per TM 9-2350-252-20–2-3.
(c) For M2A2 and M3A2 only, remove ballistic
sight shield assembly per TM 9-2350-284-20-2-3.
3-21
TM 750-116
(d) Perform purging and charging procedure para
2-5.b.
(e) Remove outlet port screw and discard.
(f) Purge instrument at 4 psig for 10 minutes or until
all visible traces of moisture are gone.
(g) Apply thin coat of lubricant (item 3, appx B) to
o-ring of replacement outlet port screw and install.
(h) Torque outlet port screw to 24-28 in-lb (28-32
cm kg).
(i) Charge instrument at 4 psig for 10 minutes.
(j) Leak test instrument for minimum of 10 minutes.
If leak is detected, repair per table 3-1.
(k) For M2A1, M3A1, M2A2, and M3A2 only, reduce pressure from 4 psig to approximately 1.5 psig.
(l) For M2, M3, M2A1, and M3A1 only, close sight
shield assembly per TM 9-2350-252-20-2-3.
(m) For M2A2 and M3A2 only, install ballistic sight
shield assembly per TM 9-2350-284-20-2-3.
(n) Close and secure gunner’s hatch cover per TM
9-2350-252-10-2 (for M2, M3, M2A1, and M3A1 only) or
TM 9-2350-284-10-2 (for M2A2 and M3A2 only).
(3) Commander’s Relay Assembly (figs. 3-50
and 3-51).
Table 3-1 Leak Test, Integrated Sight Unit
Part leak detected from
Manual referred for M2,
M3, M2A1, and
M3A1 vehicles
Manual referred for
M2A2 and
M3A2 vehicles
lamp window
collar assembly
TM9-2350-25220-2-3
TM9-2350-28420-2-3
lampholder assembly cover
TM9-2350-25220-2-3
valve assembly
TM9-2350-25220-2-3
TM9-2350-28420-2-3
all other parts of
ISU
TM9-1425-47434-1 (M2/M3)
TM9-1425-45334-1 (M2A1/
M3A1)
TM9-1425-45334-1
——
Figure 3-50 Commander’s Relay Assembly
LAMP WINDOW COLLAR ASSEMBLY
Commander’s Relay Assembly seals could
rupture if pressure is too high. Never let low
pressure gage get higher than 4 psig.
(a) Open and secure gunner’s hatch cover per TM
9-2350-252-10-2 (for M2, M3, M2A1, and M3A1 only) or
TM 9-2350-284-10-2 (for M2A2 and M3A2 only).
NOTE
Shim(s) may or may not be present between
night sight cover support and turret.
LAMPHOLDER COVER (M2, M3, ONLY)
Figure 3-49 Lamp Assembly
3-22
(b) For M2A2 and M3A2 only, remove two screws,
washers, shim(s), and night sight cover actuator handle/support.
TM 750-116
Table 3-2 Leak Test, Commander’s Relay
Assembly
Figure 3-51 Night Sight Cover Actuator
Handle/Support
(c) Perform purging and charging procedure para
2-5.b.
(d) Remove outlet port screw and discard.
(e) Purge instrument at 4 psig for 3-5 minutes or
until all visible traces of moisture are gone.
(f) Apply thin coat of lubricant (item 3, appx B) to
o-rings of replacement outlet port screw and install.
(g) Torque outlet port screw to 10-12 in-lb (12-14
cm kg).
(h) Charge instrument at 4 psig for 10 minutes.
(i) Leak test instrument for minimum of l0 minutes.
If leak is detected, repair per table 3-2.
Part leak
detected from
Manual referred for M2,
M3, M2A1, and
M3A1 vehicles
Manual referred for
M2A2 and
M3A2 vehicles
valve assembly
TM9-2350-25220-2-3
TM9-2350-28420-2-3
commander’s
eyepiece assembly
TM9-1425-47434-1 (M2/M3)
TM9-1425-45334-1 (M2A1/
M3A1)
TM9-1425-45334-1
all other parts of
commander’s
relay asembly
DMWR
9-1240-394
(M2, M3)
DMWR
9-1240-399-1
(M2A1, M3A1)
DMWR
9-1240-399-1
(j) For M2A2 and M3A2 only, apply primer item 4,
appx B) and sealing compound (item 5, appx B) to threads
of two screws. Position shim(s), night sight cover actuator
handle/support and install two washers and screws.
(k) Close and secure gunner’s hatch cover per
TM 9-2350-252-10-2 (for M2, M3, M2A1, and M3A1
only) or TM 9-2350-282-10-2 (for M2A2 and M3A2
only).
b. 8635466 Infinity Sight (fig. 3-52).
NOTE
Infinity sights 8635466 are identified as early
and late production models. The procedures for
purging and charging apply to later production
models only.
Figure 3-52 8635466 Infinity Sight
3-23
TM 750-116
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 1 psig for 10 seconds.
(4) Leak test for a minimum of 5 minutes.
c. M44C Infinity Sight (fig. 3-53).
NOTE
M44C sights are equipped with two types of
inlet ports. Some sights require the use of an
adapter. If this is the case, use purging procedure para 3-5.e.)
Figure 3-54 M61 Computing Sight
(1) Perform purging procedure para 2.5.b
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 5 psig for 5 minutes.
(4) Leak test for a minimum of 10 minutes.
e. Commander’s Extension, PN 12285300 (fig.
3-55).
Figure 3-53 M44C Infinity Sight
Figure 3-55 Commander’s Extension PN 12285300
(1) Remove outlet plug, spring, and plunger.
(2) Perform purging procedure para 2-5.c
(1) Perform purging and charging procedure para
2-5.a.
(2) Purge instrument at 8 psig for 5 minutes.
(3) Purge instrument at 5 psig for 5 minutes.
3-24
(3) Ensure relief valve closes at 5 psig.
(4) Leak test for a minimum of 5 minutes.
TM 750-116
f. Control Unit, Image (fig. 3-56).
g. Gunner’s Auxiliary Sight, PN 12278900 (fig.
3-57).
Figure 3-57 Gunner’s Auxiliary Sight PN 12278900
Figure 3-56 Image Control Unit
(1) Loosen, but do not remove setscrews in the contrast knob, reticle knob, sensitivity knob, symbols knob,
unit test pattern knob, and two boresight knobs from the
front panel.
(2) Remove all knobs from the unit.
(1) Perform purging and charging procedure para
2-5.a.
(2) Purge instrument at 8 psig for 10 minutes.
(3) Ensure relief valve closes at 5 psig.
(4) Leak test for a minimum of 5 minutes.
h.
Gunner’s Primary Sight, PN 12282140,
PN 12549761-2, PN 12549761-3, and
PN 9377279-2 (fig. 3-58).
(3) Perform purging and charging procedure para
2-5.a.
(4) Purge instrument at 10 psig for 3 minutes.
(5) Ensure relief valve closes at 5 psig.
(6) Leak test all sealed joints, screws, control shafts,
purging valve, and relief valve for minimum of 15 minutes.
(7) Install knobs on front panel.
Figure 3-58 Gunner’s Primary Sight PN 12282140,
PN 12549761-2, PN 12549761-3, PN 9377279-2
(1)
2-5.a.
(2)
(3)
(4)
Perform purging and charging procedure para
Purge instrument at 6 psig for 5 minutes.
Ensure relief valve closes at 5 psig.
Leak test for minimum of 5 minutes.
3-25
TM 750-116
i.
Tank Thermal Sight,
(1) Commander’s Display (fig. 3-59)
(3) Head Assembly (fig. 3-61). Refer to para
3-13.i.(1) for procedures.
Figure 3–59 Commander’s Display
(a) Perform purging and charging procedure para
2-5.a.
(b) Purge instrument at 8 psig for 5 minutes.
(c) Ensure relief valve closes at 5 psig.
(d) Leak test for minimum of 5 minutes.
Figure 3-61 Head Assembly
(4) Power Converter (fig. 3-62). Refer to para
3-13.i.(1) for procedures.
(2) Gunner’s Display (fig. 3-60). Refer to para
3-13.i.(1) for procedures.
Figure 3-60 Gunner’s Display
3-26
Figure 3-62 Power Converter
TM 750-116
j. Weapon Sight, PN 12279200 (fig. 3-63).
(3) Purge instrument at 5 psig for 10 minutes.
(4) Charge instrument at 1 psig for 40 seconds.
(5) Leak test for minimum of 5 minutes.
b. Articulated Telescope, M105F (fig. 3-64).
Refer to para 3-14.a. for procedures.
c. Articulated Telescope, M127 (fig. 3-65).
(1) Eyepiece Assembly.
Figure 3-63 Weapon Sight, PN 12279200
(1) Perform purging and charging procedure para
2-5.a.
(2) Purge instrument at 7 psig for 5 minutes.
(3) Ensure relief valve closes at 5 psig.
(4) Leak test for minimum of 5 minutes.
3-14. Telescopes, Articulated.
a. Articulated Telescope, M105D (fig. 3-64).
NOTE
The telescope must be removed from the installed position for purging and charging procedures. Refer to appendix A for a listing of
applicable publications.
Figure 3-65 M127 Articulated Telescope
(a) Perform purging and charging procedure para
2-5.a.
(b) Purge instrument at 8 psig for 10 minutes.
(c) Ensure relief valves close at 5 psig.
Figure 3-64 M105D Series Telescope
(1) Remove inlet port cap and outlet plug with gasket
attached.
(2) Perform purging and charging procedure para
2-5.b.
(d) Leak test for minimum of 5 minutes.
(2) Objective Assembly. Refer to para 3-14.c.(1)
for procedures.
d. Articulated Telescope, M127A1 (fig. 3-61).
Refer to para 3-14.a. for procedures.
3-27
TM 750-116
3-15. Telescopes, Elbow.
e. Elbow Telescope, M138 (fig. 3-68).
a. Elbow Telescope, M114 (fig. 3-66).
Figure 3-66 M114 Elbow Telescope
(1) Perform purging and charging procedure para
2-5.b.
Figure 3-68 M138 Elbow Telescope
(2) Purge instrument at 5 psig for 5 minutes.
(3) Charge instrument at 1 psig for 10 seconds.
(4) Leak test for minimum of 5 minutes.
b. Elbow Telescope, M114A1 (fig. 3-66). Refer
to para 3-15.a. for procedures.
c. Elbow Telescope, M16 and M116 Series (fig.
3-69). Refer to para 3-15.f. for procedures.
d.
Elbow Telescope, M118 Series (fig. 3-67).
(1) Perform purging and charging procedure para
2-5.a.
(2) Purge instrument at 8 psig for 5 minutes.
(3) Ensure relief valve closes at 5 psig.
(4) Leak test for minimum of 5 minutes.
f. Elbow Telescope, M139 (fig. 3-69).
NOTE
The telescope must be removed from the installed position for purging and charging procedures. Refer to appendix A for a listing of
applicable end item manuals.
Figure 3-67 M118A2/M118A3 Elbow Telescope
Figure 3-69 M139 Elbow Telescope
(1) Perform purging and charging procedure para
2-5.b.
(2) Purge instrument at 5 psig for 15 minutes.
(3) Charge instrument at 1 psig for 1 minute.
(4) Leak test for minimum of 5 minutes.
3-28
(1) Perform purging procedure para 2-5.d.
(2) Purge instrument at 5 psig for 5 minutes.
TM 750-116
3-16. Telescopes, Panoramic.
a. Panoramic Telescope, M12A7Q (fig. 3-70).
Figure 3-70 M12A7Q Panoramic Telescope
(1) Perform purging procedure 2-5.d.
Figure 3-71 M113 and M113A1 Panoramic
Telescope
(2) Purge instrument at 5 psig for 5 minutes.
(2) Optical Assembly (fig. 3-71).
b. Panoramic Telescope, M12A7S (fig. 3-70).
Refer to para 3-16.a. for procedures.
c. Panoramic Telescope, M113 and M113A1
(fig. 3-71).
(1) Counter Box Assembly.
(a) Remove counter box inlet port cap and outlet
port cap.
(b)
Perform purging procedure para 2-5.c.
(c)
Purge instrument at 5 psig for 5 minutes.
(a) Remove optical inlet port cap and optical outlet
screw.
(b) Perform purging and charging procedure para
2-5.b.
(c) Purge instrument at 5 psig for 5 minutes.
(d) Charge instrument at 3 psig for 10 seconds.
(e) Leak test for minimum of 5 minutes.
3-29
TM 750-116
d. Panoramic Telescope, M115 (fig. 3-72).
(1) Counter Box Assembly.
(a) Remove counter box inlet port cap and outlet
port cap.
(b) Perform purging procedure para 2-5.c.
(c) Purge instrument at 5 psig for 5 minutes.
e. Panoramic Telescope, M117/M117A1 (fig.
3-73).
(1) Counter Box.
(a)
port cap.
(b)
(c)
Figure 3-72 M115 Panoramic Telescope
(2) Optical Assembly.
Remove counter box inlet port cap and outlet
Perform purging procedure para 2-5.c.
Purge instrument at 5 psig for 5 minutes.
Figure 3-73 M117/M117A2 Panoramic Telescope
(2) Optical System.
(a) Remove optical system inlet port cap and outlet
screw.
(a)
screw.
Remove optical system inlet port cap and outlet
(b) Perform purging and charging procedure para
2-5.b.
(b)
2-5.b.
Perform purging and charging procedure para
(c) Purge instrument at 5 psig for 5 minutes.
(d) Charge instrument at 1 psig for 10 seconds.
(c)
(d)
(e) Leak test for minimum of 5 minutes.
(e)
3-30
Purge instrument at 5 psig for 5 minutes.
Charge instrument at 1 psig for 10 seconds.
Leak test for minimum of 5 minutes.
TM 750-116
f. Panoramic Telescope M137 (fig. 3-74).
(c) Purge instrument at 7 psig for 5 minutes.
g. Panoramic Telescope, M137A1 (fig. 3-75).
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
(1) Counter Box.
(a) Remove counter box inlet port cap.
(b) Perform purging and charging procedure para
2-5.a.
(1) Counter Box.
(a) Perform purging and charging procedure para
2-5.a.
(c) Purge instrument at 7 psig for 5 minutes.
(d) Ensure relief valve closes at 5 psig.
(e) Leak test for minimum of 5 minutes.
(b) Relief valve should open between 3-10 psig.
(c) Purge instrument at 7 psig for 5 minutes.
(d) Ensure relief valve closes between 1-5 psig.
(e) Leak test for minimum of 5 minutes.
Figure 3-74 M137 Panoramic Telescope
(2) Optical Assembly.
(a) Remove optical inlet port cap.
(b) Perform purging procedure para 2-5.a
Figure 3-75 M137A1 Panoramic Telescope
3-31
TM 750-116
(2) Optical System.
(a)
2-5.a.
Perform purging and charging procedure para
(b)
Relief valve should open between 3-10 psig.
(c)
Purge instrument at 7 psig for 5 minutes.
(d)
Ensure relief valve closes between 1-5 psig.
(e)
Leak test for minimum of 5 minutes.
Contamination can damage the telescope.
Blow pressurized nitrogen through the
charging lines to remove contamination.
(5) Open tank supply valve and observe high pressure
gauge indicating that tank is pressurized.
(6) Remove lockwire and cap from valve stem.
h. Panoramic Telescope, M901A1 (fig. 3–76).
NOTE
Purge panoramic telescope when the internal
optical surfaces are fogged over. Replace the
desiccant and two preformed packings every
time the unit is purged. Do not attempt to check
the pressure in the panoramic telescope at any
other time than during the pressurization cycle.
Loss of pressure resulting from such attempts
will shorten the time between maintenance
actions.
(1) Remove desiccator by unscrewing container part
(hex head) from telescope body.
(2) Hold container part upright and remove slotted cap
of desiccator.
(3) Discard old desiccant. Discard two preformed
packings from desiccator. Install desiccator.
The sealscrew is a captive screw and must
not be removed. Removal of the screw damages equipment.
(7) Install hose assembly on valve stem and loosen
setscrew.
(8) Adjust pressure regulator to 4-5 psig (28 to 34
kPa) as indicated on low pressure gauge.
(9) Verify nitrogen is being vented from sealscrew
hole and observe humidity indicator.
(10) Purge telescope until all sections of indicator are
blue. During purge, lubricate preformed packings lightly
with silicone compound.
(11) Close pressure regultor valve and tighten setscrew.
(12) Remove dessicator from telescope body and refill
desiccator to level slightly below threads.
(13) Lightly lubricate preformed packing on top part
of desiccator with grease or silicone compound.
(14) Install top part of desiccator to bottom.
(15) Lightly lubricate preformed packing with grease
or silicone compound.
(16) Install desiccator on telescope body and tighten
to 20 to 30 in lb. (2.25 to 3.39 Nm).
(17) Slowly open pressure regulator valve and charge
instrument to 2.0 + or - .0.5 psig (14 + or - 3 kPa). Tighten
setscrew when pressure regulator gauge stabilizes.
(18) If overpressurization occurs, slowly open setscrew, adjust pressure regulator to 2.0 + or - 0.5 psig; then
tighten setscrew when pressure regulator gauge stabilizes.
Figure 3-76 Panoramic Telescope, M901A1
(4) Close nitrogen tank valve and pressure regulator
valve.
3-32
(19) Close pressure regulator gauge. Remove hose
assembly and replace cap on nut of valve and install lockwire.
(20) Close tank supply valve and verify on high pressure gage.
TM 750-116
i. Panoramic Telescope, M981 FISTV (fig.
3-76). Refer to 3-16.h. for procedures.
b. M134 Straight Telescope (fig. 3-78).
NOTE
The telescope must be removed from the vehicle or the vehicle storage area before beginning purging procedures. Refer to appendix A
for a listing of applicable publications.
3-17. Telescopes, Straight.
a. M90A2 Straight Telescope (fig. 3-77).
HANDLE WITH CARE. IN THE EVENT
THE RADIOLUMINOUS SOURCE IS
BROKEN, CRACKED, OR SUDDENLY
LOSES ILLUMINATION, DO NOT ATTEMPT TO REPAIR. IMMEDIATELY
DOUBLE WRAP INSTRUMENT IN PLASTIC AND NOTIFY THE LOCAL RADIATION PROTECTION OFFICER (RPO).
Figure 3-78 M134 Straight Telescope
(1)
(2)
Perform purging procedure para 2-5.d.
Purge instrument at 5 psig for 5 minutes.
3-18. T e s t Set, Receiver/Transmitter (fig.
3-79).
Figure 3-77 M90A2 Straight Telescope
(1) Perform purging and charging procedure para
2-5.a.
(2) Relief valve should open between 3-10 psig.
(3) Purge instrument for 5 minutes.
(4) Relief valve should close between 1-5 psig.
(5) Leak test for a minimum of 5 minutes.
Figure 3-79 Receiver/Transmitter Test Set
a.
b.
c.
d.
Perform purging and charging procedure para 2-5.b.
Purge instrument at 10 psig for 15 minutes.
Charge instrument at 1 psig for 10 minutes.
Leak test for minimum of 5 minutes.
3-33
TM 750-116
3-19. Trainer, M55 Laser (figs. 3–80 and
3-81).
a. Barrel Assembly (fig. 3-80).
(1) Perform purging procedure para 2-5.d.
(2) Purge instrument at 5 psig for 2 minutes.
3–20. Unit, Reticle Projector (fig. 3-82).
Figure 3-80 M55 Barrel Assembly
(1) If necessary, remove the barrel extension by turning it counterclockwise.
(2) Remove the lens guard and loosen the outlet
screw.
(3) Perform purging and charging procedure para
2-5.b.
(4) Purge instrument at 5 psig for 2 minutes.
(5) Charge instrument at 1 psig for 1 minute.
(6) Leak test for minimum of 5 minutes.
(7) Tighten outlet screw and install lens guard.
Figure 3-82 Reticle Projector Unit
a.
Perform purging procedure para 2-5.c.
b. Purge instrument at 8 psig for 5 minutes.
b. Deflector Optical Assembly (fig. 3-81).
Figure 3-81 M55 Deflector Optical Assembly
3-34
TM 750-116
APPENDIX A
REFERENCES
A-1. SCOPE.
This appendix lists all forms, field manuals, technical manuals, and miscellaneous publications referenced in this manual.
A-2. FORMS.
Recommended Changes to Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..DA Form 2028
Recommended Changes to Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. DA Form 2028-2
Quality Deficiency Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..SF 368
A-3. FIELD MANUALS.
First Aid for Soldiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..FM 21-11
A-4. TECHNICAL MANUALS.
General Maintenance Procedures for Fire Control Materiel ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..TM 9-254
Procedures for Destruction of Aviation General Support Equipment to Prevent Enemy Use . . . . . . . . . . . .. TM 750-244-1-4
Procedures for Destruction of Equipment to Prevent Enemy Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..TM 750-244-3
The following publications should be referred to for removal and installation instructions.
FIRE CONTROL
INSTRUMENT
Aiming Circle, M2A2
TM REFERENCE
APPLICATION
TM REFERENCE
9-1290-262-24
BFVS M2/M3
Backup Sight
Collimator, M1Al
END ITEM
9-2350-252-10-2
9-1240-324-34&P
Commander’s Relay Assy.
BFVS
M2/M3/M2A1/M3A1
Commander’s Relay Assy.
BFVS M2A2/M3A2
Integrated Sight Unit
BFVS
M2/M3/M2Al/M3Al
Integrated Sight Unit
BFVS M2A2/M3A2
9-2350-284-10-2
9-2350-284-20-2-3
9-1425453–34-1
M11OA2
9-2350-304-20-2
M109A2/A3/A4/A5
9-2350-311-20-2
Mount, M137
Mount, M145/M145Al
9-1240-400-34
9-1240-401-34&P
9-2350-252-l0-2
9-2350-252-20-3
9-1425-474-34-l(M2/M3)
9-1425-453–34-l
(M2A1/M3Al)
9-2350-284-10-2
9-2350-284-20-2-3
9-1425-453-34-1
9-2350-252-10-2
9-2350-252-20-2-3
9-1425-474-34-l(M2/M3)
9-1425-453-34-1
(M2A1/M3Al)
A-1
TM 750-116
A-4. TECHNICAL MANUALS – continued
FIRE CONTROL
Mount, M149/M149A1
9-1240-312-34
Muzzle Boresight
M26A1/M27Al
9-4933-259-14&P
Periscope, M30C
END ITEM
M551/M551Al
9-2350-230-20-2
M48A5
9-2350-258-20-2
Periscope, M32E1
9-1240-313-34
M48A5
9-2350-258-20-2
Periscope, M32CE1/M35El
9-1240-313-34
M60/M60A1
9-2350-222-2 Series
Periscope, M36 Series
9-1240-314-34
CEV M728
M60/M60A1
9-2350-222-20-2 Series
9-2350-257-20-2 Series
Periscope, M42
9-1240-401-34
M109A2/A3/A4/A5
9-2350-31l-20-2
Periscope, M47
9-6650-221-35
M551/M551Al
9-2350-230-20-l
Periscope, M48
9-6650-222-35
M551/M551A1
9-2350-230-20-l
Periscope, M65,
Battery Commander’s
9-1240-368-34
Quadrant, M15
9-1290-322-34&P
M109A2/A3/A4/A5
9-2350-311-20-2
Telescope, M105D
9-1240-262-34
M60A1
M60A3
M60A1 Rise/
M60A2Rise Passive
M48A5 Tank
M60 Tank
9-2350-215-20-2 Series
9-2350-252-20-2
9-2350-257-20-2 Series
9-2350-258-20-2
9-2350-260-20-2 Series
Telescope, M105F
9-1240-262-34
CEV M728
9-2350-222-20-2 Series
Telescope, Panoramic, M115
9-1240-400-34
M11OA2
9-2350-304-20-2
Telescope, Panoramic,
Ml17/Ml17A2
9-1240-401-34&P
M109A2/A3/A4/A5
M109A6
9-2350-311-10
9-2350-314-10
Telescope,
Ml18A2/Ml18A3
9-1240-401-34&P
M109A2/A3/A4/A5
9-2350-311-10
Telescope, M134
9-1240-318-35
Vulcan SP, M163A1
Vulcan, Towed M167A1
Towed Pivads M167A2
9-2350-300-10
9-2350-286-10
9-1005-318-10
A-5. SUPPLY CATALOGS.
Purging Kit, Fire Control: Organizational, Direct and General Support Maintenance
and Hand Receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. SC 4931-95-J54
A-6. MISCELLANEOUS PUBLICATIONS.
The Army Maintenance Management System (TAMMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. DA PAM 738-750
A-2
TM 750-116
APPENDIX B
EXPENDABLE SUPPLIES AND MATERIALS LIST
Section I. INTRODUCTION
B-1. SCOPE.
This appendix lists expendable supplies and materials you will need to purge and charge fire control instruments. These items
are authorized to you by CTA 50-970, Expendable Items (Except Medical, Class V, Repair Parts, and Heraldic Items).
B-2. EXPLANATION OF COLUMNS.
a. Column (1) - Item number. This number is assigned to the entry in the listing and is referenced in the narrative instructions to identify the material (e.g., “Use sealing compound, item ......, appendix B“).
b. Column (2) - National Stock Number. This is the National stock number assigned to the item; use it to request or
requisition the item.
c. Column (3) - Description. Indicates the Federal item name and, if required, a description to identify the item. The last
line for each item indicates the Contactor and Government Entity Code (CAGEC) in parentheses followed by the part number.
d. Column (4) - Unit of Measure (U/M). Indicates the measure used in performing the actual maintenance function.
This measure is expressed by a two-character alphabetical abbreviation (e.g., ea, in, pr). If the unit of measure differs from
the unit of issue, requisition the lowest unit of issue that will satisfy your requirements.
Section II. EXPENDABLE SUPPLIES AND MATERIALS LIST
(2)
NATIONAL STOCK
NUMBER
I
(4)
U/M
(3)
DESCRIPTION
1
8105-00-150-6256
Bag, plastic, general purpose, 44 x 32 inches
BX
2
6830-00–782-2641
Nitrogen, technical, oil–free, Gas form,
(81348), Type 1, BB-N-411, Grade B,
Class 1
CF
3
1240-01-189-4372
Lubricant (18876), MIS-23546
8030-00-900-2373
Sealing Compound, Primer (05972), MILS-22473, Grade N, Form R; MIL-R-46082,
Grade F MIL-S-46162, Grade N;
764-55
8030-01-166-0575
Sealing Compound (05972), 567-47
6
8030-00-275-8114
Sealing Compound, adhesive, noncuring,
polysulfide base, type 1, (80064), 1941316
7
8520-00-228-0598
Soap, toilet, liquid, l–gallon container:
(81348) P-S-624
I
QT
OZ
GL
B-1 (B-2 blank)
TM 750-116
APPENDIX C
ADDITIONAL SUPPLIES
C-1. COMMON TOOLS AND EQUIPMENT. For authorized common tools and equipment, required to perform the operations described in this manual refer to the Modified Table of Organization and Equipment (MTOE) applicable
to your unit.
C-2. OUTLET PORT SCREWS AND PLUGS. Table C-1 lists replacement self-sealing screws and plugs for
outlet ports. Select replacement hardware by determining the thread size and depth of the port requiring hardware.
Table C-1. Self-Sealing Outlet Screws and Plugs
Part No.
National Stock No.
Thread
Length (inches)
AN505-4R5
5305-00-639-7518
4-4OUNC, Screw, Machine
FFS92
5305-00-011-0499
10-24UNC, Screw, Machine
3/8
MS3212-1
5305-00-738-0624
40-UNC-2A, Screw, Machine
1/4
MS3212-21
5305-00-433-3707
8-32UNC, Screw, Machine
1/4
MS3212-31
5305-00-855-2989
10-32UNF, Screw, Machine
3/8
MS3212-39
5305-00-085-4056
24UNC, Screw, Machine
3/8
MS5103-33
5305-00-724-3439
MS I 6996-40
5305-00-068-8202
10-24UNF, Screw, Cap, Socket Head
1
MS35266-61
5305-00-543-2753
10-32UNF, Screw, Machine
3/8
MS35375-239
5305-00-939-9219
8-32UNC, Screw, Machine
1/8
MS49005-2
4730-00-01 8–9566
MS51957-13
5305-00-054-5647
4-4OUNC, Screw, Machine
1/4
MS51957-59
5305-00-050-9225
10-24UNC, Screw, Machine
1/4
MS51958-24
5305-0>964-0310
6-4OUNC, Screw, Machine
1/8
0228372
5305-00-003-7126
8-32UNC, Screw, Machine
1/2
100697
5305-00-010-0697
6-32UNC, Screw, Machine
1/4
10541671
5305-00-997-4604
4-4OUNC, Screw, Shoulder
3/1 6
105551 57–1
5305-00-085-3706
4-4OUNC, Screw, Machine
3/1 6
105551 57–2
5305-00-606-8179
4-40UNC, Screw, Machine
1/4
10555157-4
5305-00-955-2941
6-32UNC, Screw, Machine
3/16
10555157-6
5305-00-41 9–3378
6-32UNC, Screw, Machine
5/16
10555157-7
5305-00-740-8890
6-32UNC, Screw, Machine
3/8
105551 57–8
5305-01-057-9300
8-32UNC, Screw, Machine
1/4
105551 57–11
5305-00-1 82–7302
10-32UNF, Screw, Machine
1/4
105551 57–14
5305-00-524-0709
10-24UNC, Screw, Machine
1/4
11737540-2
5305-00-245-5157
10-32UNC, Screw, Self-locking
3/8
11737718
5305-00-111 –5540
8-36UNF, Setscrew
1/8 NPT, Plug, Pipe
8-32UNC, Screw, Machine
5/16
1/8
1/4
I
3/4
C - 1
TM 750-116
Table C-1. Self-Sealing Outlet Screws and Plugs (continued)
1/6
8574881
5305-00-684-4401
8624877
5305-00-857-5190
8-32UNC, Screw, Machine
1/4
8626469
5305-00-959-6865
4-4OUNC, Screw, Self-locking
5/32
8643632
5305-00-930-1808
8-32UNC, Screw, Machine
1/4
3/8-32UNF, Plug, Machine Thread
C-3. INLET PORT SCREWS. Table C-2 lists replacement screws for purging inlet ports. Select replacement
hardware by determining the thread size and depth of the port requiring hardware.
Table C-2. Self-Sealing Screws, Inlet
Part Number
National Stock Number
Length (inches)
Thread
MS3212-21
5305-00-433-3707
8-32UNC, Screw, Machine
1/4
MS3212-31
5305-00-855-2989
10-32UNC, Screw, Machine
3/8
MS16996-40
5305-00-068-8202
10-24UNC, Screw Cap, Socket Head
8624877
5305-00-857-5190
8-32UNC, Screw, Machine
1/4
11737540-1
5305-00-262-0077
6-32UNC, Screw, Self–locking
3/16
11737540-2
5305-00-245-5157
10-32UNF, Screw, Self-locking
1
3/8
C-4. PNEUMATIC VALVES. Table C-3 lists replacement pneumatic valves for inlet and outlet ports. Select replacement hardware by determining the thread size and depth of the port requiring hardware.
Table C-3. Pneumatic Valves Assemblies/Components
Part Number
National Stock Number
Description
MS51607-1
1240-00-114-1096
Valve Stem
MS51377-2
2640-00-060-3543
Valve Core
MS20813-1
2644-00-222-4525
Cap
SM-C-805978-1
4820-00-427-5047
Schroeder
SM-C-805845
5885-01-063-1403
Schroeder
10556186
4820-01-053-0223
Relief, 5 psig
8200055
2640-00-507-9260
Cap
10516567
1240-00-464-4792
Strap
11737597
5310-00-096-9728
Nut, plain hexagon
C-2
TM 750-116
C-5. PARTS KITS. Table C-4 lists the parts kits to be used for specific applications.
Table C-4. Parts Kits
Part Number
5705155*
National Stock Number
1240–01–114-3070
Application
Laser Rangefinder for
M1/M1A1 Tank
*For M1 Tank, this kit is part of Service Kit, Laser; Part No. 5705438, NSN 2540-01-255-3347.
For M1A1 Tank, this kit is part of Service Kit, Laser; Part No. 5705137, NSN 3640-01-117-7942.
C-3 (C-4 blank)
TM 750-116
INDEX
PAGE
SUBJECT
A
Additional Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Aiming Circle, M2A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Applicable Publications, List of. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
B
Binocular, M19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Bleed Down of Purging and Charging Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
C
Collimator, M1A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Common Tools and Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Computer, M21, Electronic, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Corrosion Prevention and Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
D
Destruction of Army Materials to Prevent Enemy Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Device, Alinement
M139/M140 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Devices, Boresight
M26/M27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
M26A1/M27Al Muzzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
E
Equipment Characteristics, Capabilities, and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Expendable Supplies and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
F
Field Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..A-1
Forms, Records, and Reports, Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..1-1
Forms, References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..A-l
I
Inlet Port Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..C-2
M
Maintenance Forms. Records and Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..1-1
Mounts, Telescope
M137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-6
M145/M145Al . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-6
M149/M149El . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-6
M187 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-7
O
Outlet Port Screws and Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-l
P
Parts Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..C-3
Periscope, M65 Battery Commander’s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-7
Periscopes, Tank
M28C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-8
M30C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-8
M32E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-9
Index 1
TM 750-116
INDEX – Continued
SUBJECT
PAGE
Periscopes, Tank - continued
M32CE1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M35E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M36E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A1E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M44A2E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M901 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M981 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pnuematic Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Publications, Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purging and Charging Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10
3-10
3-11
3-12
3-12
3-13
3-13
3-14
3-15
3-15
3-15
3-15
3-15
3-16
3-17
C-2
A-2
2-3
Q
Quadrants
M14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M14A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-17
3-17
3-17
3-18
3-18
R
Rangefinders
Laser . . . . . . . . . . . .
AN/VVG-2 Laser . .
M17A1, M17B1C, M17C
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reporting Equipment Improvement Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-18
3-19
3-20
A-1
1-1
S
Safety, Care, and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Screws
Inlet Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Outlet Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Setup of Purging and Charging Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Sights
BFV Tow/Tow2 Subsystem.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Backup Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Integrated Sight Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Commander’s Relay Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
8635466 Infinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
M44C Infinity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
M61 Computing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Commander’s Extension, PN 12285300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Control Unit, Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Gunner’s Auxiliary Sight PN 12278900 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Index 2
TM 750-116
INDEX - Continued
PAGE
SUBJECT
Sights - continued
Gunner’s Primary Sight PN 12282140, PN 1254976 1-2, PN 12549761-3, PN 9377279-2 . . . . . . . 3-25
Tank Thermal Sight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-26
Weapon Sight PN 12279200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-27
Supply Catalogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
T
Technical Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-l
Telescopes, Articulated
M105D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
M105F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
M127 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-27
M127A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-27
Telescopes, Elbow
M114 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-28
M114A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-28
M16 and M116 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
M118 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-28
M138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-28
M139 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-28
Telescopes, Panoramic
M12A7Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-29
M12A7S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-29
M113 and M113A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-29
Ml15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-29
M117/M117A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-30
M137 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-31
M137A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-31
M901A1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-32
M981 FISTV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-33
Telescopes, Straight
M90A2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-33
M134 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-33
Test Set, Receiver/Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-33
Time Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2-3
Trainer, M55 Laser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-34
U
Unit, Reticle Projector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3-34
V
Valves, Pneumatic ......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..C-2
Index 3 (Index 4 blank)
By Order of the Secretary of the Army:
GORDON R SULLIVAN
General, United States Army
Chief of Staff
Official:
MILTON H. HAMILTON
Administrative Assistant to the
Secretary of the Army
03954
DISTRIBUTION:
To be distributed in accordance with DA Form 12-34-E, Block 0899,
requirements for TM 750-116.
*U.S. GOVERNMENT PRINTING OFFICE: 1994 - 300-421/82036
PIN :
012697-000
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