29 1. 2 ORGANIZATIONAL MAINTENANCE OF THE M242 29 3 TERMINAL LEARNING OBJECTIVE ACTION: CONDUCT...
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Transcript of 29 1. 2 ORGANIZATIONAL MAINTENANCE OF THE M242 29 3 TERMINAL LEARNING OBJECTIVE ACTION: CONDUCT...
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ORGANIZATIONAL
MAINTENANCE OF THE
M242
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TERMINAL LEARNING OBJECTIVE
ACTION: CONDUCT ORGANIZATIONAL MAINTENANCE ON THE M242 25-MM CHAIN GUN.
CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A TM 9-1005-200-23&P, M242 25-MM STUDENT HANDOUTS AND A M242 25-MM GUN WITH STAND AND TOOLS.
STANDARD: STUDENT MUST ACHIEVE A MINIMUM OF 80% ON BOTH WRITTEN EXAMS (OB/CB) AND RECEIVE A GO ON THE HANDS ON EVALUATION.
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SAFETY
• Watches and rings removed(taped)
• Watch out for gun stands while walking
• No sleeping in class
• Use caution when using the tools and cutting lacing wire.
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Risk Assessment
• Classroom Environment• Adequate Rest• Heat and Cold are no factors• Instructor experience extensive• Complexity of task is minimal• Only hazard is heavy equipment in classroom• Combat lifesaver on site• Risk is low
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Environmental Considerations
• Dispose of wiping rags, drink containers and used paper in accordance with local recycling regulations.
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REFERENCES
• TM 9-1005-200-23&P (JUNE 2001)
• M242 25-MM STUDENT HAND OUT
• BLANK DA FORM 2408-4
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TERMINAL LEARNING OBJECTIVE
ACTION: CONDUCT ORGANIZATIONAL MAINTENANCE ON THE M242 25-MM CHAIN GUN.
CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A TM 9-1005-200-23&P, M242 25-MM STUDENT HANDOUTS AND A M242 25-MM GUN WITH STAND AND TOOLS.
STANDARD: STUDENT MUST ACHIEVE A MINIMUM OF 80% ON BOTH WRITTEN EXAMS (OB/CB) AND RECEIVE A GO ON THE HANDS ON EVALUATION.
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ENABLING LEARNING OBJECTIVE A
• ACTION: DEFINE THE CHARACTERISTICS AND CAPIBILITIES OF THE M242 25-MM CHAIN GUN.
• CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A M242 25-MM GUN, TM 9-1005-200-23&P, A M242 25-MM STUDENT HANDOUT AND A M242 GUN STAND WITH TOOLS.
• STANDARD: THE STUDENT MUST CORRECTLY DEFINE ALL OF THE CHARACTERISTICS AND CAPABILITIES OF THE M242 25-MM CHAIN GUN, IAW TM 9-1005-200-23&P AND THE M242 25-MM STUDENT HAND OUTS.
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1.0hp 24vdciiii
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M242, 25-MM, AUTOMATIC CHAIN GUN
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121. AUTOMATIC GUN FEEDER ASSEMBLY2. AUTOMATIC GUN RECEIVER ASSEMBLY3. BARREL ASSEMBLY
M242, 25-MM AUTOMATIC GUN
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BARREL ASSEMBLY
COUNTERS SOME EXPLOSIVE RECOIL FORCE
HELPS CONTAIN EXPLOSIVE FORCE
ASSEMBLY
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BARREL ASSEMBLY
Old Configuration
New Configuration
NSN CHG
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BARREL ASSEMBLY
2. 25-MM BARREL3. ROUND PLAIN NUT4. MACHINE KEY5. MUZZLE BRAKE
1. COTTER PIN2. 25-MM BARREL5. MUZZLE BRAKE
1
2
3
45
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BARREL ASSEMBLY• RIBBED BARREL ASSY HAS TWO TYPES OF
INTERNAL FINISHES, NITRIDE AND CHROME. EITHER TYPE IS USABLE ON THE STANDARD GUN, THE CHROME BARREL ASSY IS REQUIRED ON THE ENHANCED GUN. NON-RIBBED BARREL ASSY IS ONLY USED ON THE STANDARD GUN.
• AVERAGE PERFORMANCE LEVELS: STANDARD ROUND=4000 RDS (NSN) RIBBED(NITRIDE)=5000 RDS RIBBED(CHROME)=7000 RDS *ALL AP (M919 OR M791)= 3000 RDS STD-$6086 ENH-$8297
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BARREL EROSION GAGE
INSPECTION FOR EROSION IS THE SAME FORALL BARREL CONFIGURATIONS. (WP 0023 00-6)
EROSION GAGE ROD
GAGE HEAD
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(AGI) SYSTEM BG 10
MEASUREMENTS ARE TAKEN AT 16 PRE-DETERMINED POSITIONS ALONG THE BARREL ASSY AND THE VALUES STORED IN ITS ELECTRONICS UNIT. AT EACH POSITION THE MEASUREMENT IS AUTOMATICALLY COMPARED TO PRE-STORED WARNING /REJECTION LIMITS OF WEAR. THE PROCESS TAKES LESS THAN THREE MINUTES PER BARREL ASSY AND MAY BE ACHIEVED WITH THE BARREL INSTALLED.
ALL DATA THAT IS STORED DURING THE MEASUREMENTS IN THE NONVOLATILE SYSTEM OF THE BG10 MEMORY MAY BE SUBSEQUENTLY DOWN-LOADED VIA THE INTEGRAL RS232 SERIAL PORT TO A PERSONAL COMPUTER.
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AUTOMATIC GUN FEEDER ASSEMBLY
FORWARD FEED SECTION
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Forward Feed Section Subcomponents
1. Forward Feed Assembly
2. Upper Feed Sprocket Assembly
3. Lower Feed Sprocket Assembly
4. Round Positioner Assembly
5. Feeder Assembly Rotor
6. Ejection Chute
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AUTOMATIC GUN FEEDER ASSEMBLY
1. SOCKET HEAD CAP SCREW2. MOUNTING BRACKET3. RIGHT CONNECTING LINK4. FEEDER STAND-OFF5. LINK SHIELD6. SMALL CARTRIDGE GUIDE7. SOCKET HEAD CAP SCREW8. RIGHT CONNECTING LINK9. MOUNTING BRACKET10. SOCKET HEAD CAP SCREW11. FORWARD FEED ASSEMBLY12. NUT, SELF LOCKING, HEAD13. SLEEVE SPACER14. SPECIAL SPRING15. FORWARD FEEDER GATE
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16. ROUND POSITIONER ASSEMBLY17. UPPER FEED SPROCKET ASSEMBLY18. LOWER FEED SPROCKET ASSEMBLY19. SOCKET HEAD CAP SCREW20. EJECTION CHUTE
AUTOMATIC GUN FEEDER ASSEMBLY
16. ROUND POSITIONER ASSY17. UPPER FEED SPROCKET ASSY18. LOWER FEED SPROCKET ASSY19. SOCKET HEAD CAP SCREW20. EJECTION CHUTE21. SOCKET HEAD CAP SCREW
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21. FEEDER ASSEMBLY ROTOR22. STEPPED SPACER23. RIGHT CONNECTING LINK24. FEEDER DRIVE ASSEMBLY25. RIGHT CONNECTING LINK26. UPPER CARTRIDGE GUIDE
AUTOMATIC GUN FEEDER ASSEMBLY
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1. UPPER SPUR GEAR2. UPPER SLIDING SLEEVE CLUTCH3. UPPER SHOULDERED SHAFT4. CLUTCH YOKE ASSEMBLY5. WORM WHEEL GEAR6. LOWER SHOULDERED SHAFT7. LOWER SLIDING SLEEVE CLUTCH8. LOWER SPUR GEAR9. PLATE ASSEMBLY REAR FEEDER10. SCREW CAP SOCKET HEAD11. GEAR CLUTCH ASSEMBLY
AUTOMATIC GUN FEEDER ASSEMBLY
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12. SOCKET HEAD CAP SCREW13. ELECTRICAL FEED SELECT SOLENOID14. BODY ASSEMBLY SOLENOID15. SOLENOID CABLE CONNECTOR16. MACHINE SCREW17. BUSHING CAM ASSEMBLY18. COMPRESSED HELICAL SPRING19. BUSHING BRACKET ASSEMBLY20. SLEEVE SPACER21. SELF LOCKING NUT22. FLAT WASHER23. FEEDER HANDLE24. RETAINING RING25. WORM SHAFT ASSEMBLY26. FEEDER HANDLE LATCH27. TIMER ROD28. LATCH, PIVOT PIN29. FEED SHAFT STOP ASSEMBLY30. ACTUATOR31. FORK SHAFT ASSEMBLY
AUTOMATIC GUN FEEDER DRIVE ASSEMBLY
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32. COVER ACCESS33. LEVER TIMER34. PAWL-SHAFT ASSEMBLY35. INDEX DRIVE SHAFT36. TIMING CAMS W/ ROTOR STUB37. SOCKET HEAD CAP SCREW38. INDEX DRIVE COVER39. CONTROL CAM40. RETAINING RING41. BPI COVER42. SOCKET HEAD CAP SCREW43. MANUAL DRIVE HUB ASSEMBLY44. FEEDER HOUSING 45. FEEDER DRIVE ASSEMBLY
AUTOMATIC GUN FEEDER ASSEMBLY
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1. COTTER PIN2. FLAT SPRING3. POSITIONER,PLATE4. HEADED STRAIGHT PIN5. SLEEVE BUSHING6. SOCKET HEAD CAP SCREW7. FLAT WASHER8. HEAD SELF LOCKING NUT
AUTOMATIC GUN FEEDER ASSEMBLY
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AUTOMATIC GUN FEEDER ASSEMBLY
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AUTOMATIC GUN FEEDER ASSEMBLY
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AUTOMATIC GUN RECEIVER ASSEMBLY
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Receiver Assembly Subassemblies
1. Barrel Support Assembly
2. Recoil Mechanism
3. Breech Assembly
4. Sear Assembly
5. Sear Catch Assembly
6. Sear Retractor Assembly
7. Mechanical Safety Interlock System
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Receiver Assembly Subassemblies
8. 1.0 HP 24 VDC Motor Assembly
9. Handle Pin
10.Electrical Sear Solenoid
11.Riveted Receiver
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1. COTTER PIN2. HOUSING RECOIL CAP3. HEADED STRAIGHT PIN4. PERFORMED PACKING5. 25-MM RECOIL MECHANISM6. SOCKET HEAD CAP SCREW7. RETAINING RING8. MACHINE KEY9. COTTER PIN10. COMPRESSED HORIZONTAL SPRING11. HEADED STRAIGHT PIN12. BARREL LOCK PIN13. DAMPER NUT14. BREACH ASSEMBLY15. SPRING PIN16. BARREL SUPPORT ASSEMBLY
AUTOMATIC GUN RECEIVER ASSEMBLY
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17. BOLT AND TRACK ASSEMBLY18. RETAINING RING19. SLEEVE BUSHING20. ELECTRICAL SEAR SOLENOID21. HEADED STRAIGHT PIN22. SOCKET HEAD CAP SCREW23. SEAR RELEASE LINK24. STRAIGHT DRIVE SHAFT25. SOCKET HEAD CAP SCREW26. COVER ASSEMBLY27. SEAR CATCH ASSEMBLY28. SEAR ASSEMBLY
AUTOMATIC GUN RECEIVER ASSEMBLY
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29. ROCKER ASSEMBLY30. ROCKER31. SPRING PIN32. COMPRESSED HELICAL SPRING33. ROCKER SPRING HOUSING34. FORWARD CHAIN GUIDE35. REAR CHAIN GUIDE36. INTERLOCK CRANK37. PUSH ROD EXTENSION38. SEAR PUSH ROD39. COMPRESSED HELICAL SPRING40. OPERATING ROD ASSEMBLY41. REAR TRACK42. ROD ROCKER SUPPORT43. SPRING PIN44. HANDLE PIN45. COMPRESSED HELICAL SPRING46. SET SCREW47. EXTERNALLY RELIEVED SCREW48. SEAR RETRACTOR PIVOT49. SEAR RETRACTOR ASSEMBLY50. COMPRESSED HELICAL SPRING51. LATCH BRACKET52. SPRING TENSION WASHER53. TRACK HOOK LATCH54. HEADED SOCKET CAP SCREW
AUTOMATIC GUN RECEIVER ASSEMBLY
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55. HANDLE STRAIGHT PIN56. RIVETED RECEIVER 57. HEADED SOCKET CAP SCREW58. 1.0 HP, 24 VDC MOTOR ASSY59. ANNULATING BALL BEARING60. SMALL BEVEL GEAR60. LARGE BEVEL GEAR61. PREFORMED PACKING62. CLUTCH ASSEMBLY63. SHOULDERED CLUTCH SHAFT64. TORSION SPIRAL SPRING 165. TORSION SPIRAL SPRING 266. HANDLE CLUTCH STRAIGHT PIN67. SPUR CLUTCH GEAR SHAFT68. SCREW THREADED INSERT69. SOCKET HEAD CAP SCREW70. HEAD SELF-LOCKING NUT71. MECHANICAL HOUSING72. SHOULDERED DRIVE SPROCKET SHAFT73. ANNULATING BALL BEARING74. GEAR CLUSTER 75. NEED ROLLER BEARING76. SPUR ASSEMBLY GEAR77. PLAIN INCASED SEAL
AUTOMATIC GUN RECEIVER ASSEMBLY
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AUTOMATIC GUN RECEIVER ASSEMBLY
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AUTOMATIC GUN RECEIVER ASSEMBLY
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BOLT AND TRACK ASSEMBLY
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1. TRACK ASSEMBLY2. BOLT AND CARRIER ASSEMBLY
BOLT AND TRACK ASSEMBLY
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1. BREECH BOLT2. FIRING PIN, SLEEVE KEEPER3. CAM PIN ASSEMBLY4. CARRIER ASSEMBLY5. FIRING PIN SLEEVE6. FIRING PIN ASSEMBLY
BOLT AND CARRIER ASSEMBLY
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Old Configuration12524325
New Configuration12524512
Milled Flats
FIRING PIN ASSEMBLY
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1. PREFORMED PACKING2. SAFETY ACTUATOR PAWL3. COMPRESSED HELICAL SPRING4. SAFETY PAWL5. FIRING PIN PAWL6. HEADED STRAIGHT PIN7. COMPRESSED HELICAL SPRING8. ROUND PLAIN NUT9. SPRING PIN10. ROLLER CHAIN TRACK11. SPROCKET WHEEL12. ROLLER ASSEMBLY CHAIN13. SPROCKET RETAINER14. CLEVIS ASSEMBLY15. SPRING PIN16. MANUAL CONTROL HANDLE17. COMPRESSED HELICAL SPRING18. SPRING TENSION WASHER19. SPROCKET SHAFT ASSEMBLY20. SPROCKET WHEEL
TRACK ASSEMBLY
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25-MM EQUIPMENT DATA
Caliber: 25-mm dual feed
Weight: Receiver Assy 90 lbs
Barrel Assy 95 lbs (Enh-107 lbs )
Feeder Assy 59 lbs
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25-MM EQUIPMENT DATA
Rate of fire: single shot,100,200 rds/pm
Time of rate: 0.15 sec, The delay from the time the gun receives the signal to start until mechanical actions begins to start.
Time to stop: 0.12 sec,The delay from the time the gun receives the signal to stop until mechanical actions begins to stop.
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25-MM EQUIPMENT DATA
Power required: 1.0 hp 24 vdc motor assy
Clearing method:(cook-off safe) open bolt
Safety: Absolute hang-fire protection (msis)
Case ejection: forward
Peak recoil force: 12,000 pounds force (std)
9,000 pounds force (enh)
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25-MM EQUIPMENT DATA
Reliability demonstrated: 22,000 (MRBF)
Dispersion: 0.5 mil
Misfire: Total failure of a round to fire
Hang-fire: Delay in the firing of a round
Cook-off: Accidental firing of a round due to excessive heat build up in the weapon system.
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• Fire
• Unlock
• Extract
• Eject
• Sear/Charge
• Feed
• Chamber/Ram
• Lock
Eight Step Cycle of Function
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Sear/ Charge
Eject
Feed
Lock
Unlock
Chamber/ Ram
Fire
Extract
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Sear/Charge
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Feed
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Feed Dwell
• Slider moves left to right in slider path.
• Bolt and Carrier Assembly is 25-mm to the rear of Sear, it’s rearmost position.
• This is happening to allow the Feeder Assembly Rotor to sweep the spent casing into the ejection chute and place a new round on the face of the bolt assy.
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Chamber/Ram
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Lock
The bolt assembly is in its most forward possible position with the bolt carrier still moving forward. The cam pin assembly,
moving in its channel in the carrier, causes the bolt assembly to rotate 30 degrees
counterclockwise; the bolt assembly locking lugs engage the breech assembly locking lugs, giving a safe, solid lock.The firing pin assembly is fully cocked. The BPI arrow is rotating through the RED ZONE PRIOR TO
FIRE.
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Fire
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Fire Dwell• Slider moves right to left in slider path
• Bolt Assembly is locked in the Breech Assembly
• This is happening to allow hot propellant gases to escape returning chamber pressure to ambient(safe levels).
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Unlock
Once the slider has completed its right-to-left movement, it starts moving to the rear, pulling
the bolt carrier with it. As the bolt carrier is pulled to the rear, the cam pin assembly, moving
in its channel, causes the bolt assembly to rotate clockwise and unlock from the breech
assembly. The firing pin assembly is simultaneously withdrawn to the rear. As the bolt assembly unlocks, the BPI points to the
beginning of EXTRACT.
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Extract
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Eject
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Ramming/Extracting
Positive round control is provided by the:
• Positive T-slot extractors
• Continuous rim guide
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DUAL FEED SYSTEM
• Link-aligners can move a long round 9.5mm back.
• Chamber surface on the rear plate assembly can move a short round 3.1mm forward.
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DOUBLE FEED PREVENTION•The incoming round is positively prevented from feeding across into the ram position; the nose of the incoming round is ahead of the base of the round left in the chamber.•The positive T-slot extractors failing
•NOTE: BASED ON M792/M793 AMMO. THE M791/M910/M919 MISSING NOSE CAPS MAY ALLOW DOUBLE FEED SITUATION TO OCCUR!!
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66ATK M791 GD M910ATK M910GD M791 GD M919
MAX HT
MIN HT
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RECOIL MECHANISM
• Two ring spring set
• Hydraulic Damper
• 85%
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SEAR ASSY
Controlled by the electrical sear solenoid and mechanical safety
interlock system. Locks roller assembly chain in the event of
misfire by engaging the safety link, or in the
sear position by engaging the master
link.
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Bolt and Carrier Assembly
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Bolt and Carrier Assembly
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TRACK ASSEMBLY
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PITCH
• THE DISTANCE BETWEEN THE ROLLER ASSY CHAIN; MEASURED FROM THE TOP OF THE CHAIN TO THE MIDDLE OF THE CHAIN AND THEN AGAIN FROM THE BOTTOM OF THE CHAIN TO THE MIDDLE OF THE CHAIN.
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Old Configuration12524325
New Configuration12524512
Milled Flats
FIRING PIN ASSEMBLY
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FIRING PIN ASSY
• FALL IS 0.56 INCH (14.2 MM)
M115 PERCUSSION PRIMER
• DELIVERS 32 INCH-LBS
REQUIRES 19 INCH-LBS
• SAFETY MARGIN 13 INCH-LBS
BOLT FACE PROTRUSION 2-MM
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MECHANICAL SAFETY INTERLOCK SYSTEM
• Rocker assembly
• Operating rod assembly
• Interlock crank
• Push rod extension
• Sear push rod
• Sear assembly
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ROCKER ASSEMBLY
Pushed down by the Breech AssemblyIt then pulls the Operating Rod
Assembly which disengages the
Interlock crank Crank
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OPERATING ROD ASSEMBLY
Pulled forward by the Rocker Assembly which disengages the Interlock Crank
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PUSHROD EXTENSION
• Forced upward
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INTERLOCK CRANK
• Becomes Disengaged
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SEAR PUSHROD
• It is pushed out
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SEAR ASSY
Moved out of the way
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Mechanical Safety Interlock System Failure Modes
• Push rod extension or externally relieved
screw breaks
• Bolt Carrier Cam Breaks
• Sear Assembly Breaks
• Interlock Crank Breaks
• Electrical Sear Solenoid intermittent
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TIMING OF POWER TRAIN
• FEEDER HOUSING DISASSEMBLED
• FEEDER ASSY REMOVED FROM RECEIVER ASSY
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POWER TRANSMISSION SYSTEM
• 1.0 HP 24 VDC MOTOR ASSEMBLY
• FEEDER DRIVE ASSEMBLY
• CHAIN AND BOLT DRIVE**
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1. 1.0 HP 24V DC MOTOR ASSEMBLY
2. ELECTRICAL SEAR SOLENOID
3. ELECTRICAL FEED SELECT SOLENOID
4. INDEX DRIVE CABLE ASSEMBLY
ELECTRICAL SYSTEM
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1.0HP 24VDC MOTOR ASSY
between 18 and 30 Vdc is required and drives the
auto gun receiver and auto gun feeder gears.
Contains junction and connectors for interface between automatic gun receiver assembly and automatic gun feeder
assembly.
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ELECTRICAL SEAR SOLENOID
Controls sear assembly by moving sear release link and sear push rod.
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ELECTRICAL FEED SELECT SOLENOID
Provides manual or electrical selection of ammunition type
(AP or HE).
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Index Drive Cable Assembly
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S3 Breech Lock Sensor
S1 Seared Sensor
S2 Normal Shutdown
Sensor
Microswitch Sensor Harness Assembly
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1ST timed sequence 52.2 ms from S-3 breech lock sensor to S-2normal shutdown sensor
Start
Stop
1st 30 ms
Microswitch Sensor Harness Assembly
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Stop / Start
Stop
Microswitch Sensor Harness Assembly
Start 2nd timedSequence 52.2msfrom S-2Normal Shutdown to S-1Seared Sensor
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Index Drive Cable Assembly
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ENABLING LEARNING OBJECTIVE B
• ACTION: EXPLAIN THE DA FORM 2408-4.
• CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A BLANK DA FORM 2408-4.
• STANDARD: STUDENT MUST FILL OUT ALL INFORMATION CORRECTLY, IAW UP DATE 14.
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DA FORM 2408-4
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IIIIIIIIIIIIIIIIIIIIIIIIII
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IIIIIIIIIIIIIIIIIIIIIIIIII
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ENABLING LEARNING OBJECTIVE C
• ACTION: CONDUCT MAINTENANCE PROCEDURES ON THE M242 25-MM GUN.
• CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A TM 9-1005-200-23&P, M242 25-MM GUN, GUN STAND WITH TOOLS.
• STANDARD: STUDENT MUST CONDUCT MAINTENANCE PROCEDURES ON THE M242 25-MM GUN IAW TM 9-1005-200-23&P.
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TM 9-1005-200-23&P• TROUBLESHOOTING• MAINTENANCE INSTRUCTIONS• PREVENTIVE MAINTENANCE CHECKS AND
SERVICES(PMCS)• GENERAL MAINTENANCE• TORQUE PROCEDURES• REPAIR PARTS LIST• MAC CHART• SMR CODE• CROSS REFERENCE INDEXES• SPECIAL TOOLS• EXPENDABLE/DURABLE ITEMS
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TORQUE PROCEDURES
• 1ST DIVISION-6> 1000 th -ROUND UP
• 2ND DIVISION-5> 10 th - ROUND UP
• X .113 FOR N-m
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EXAMPLE: Required torque is 270-300 in-lb. (30.51-33.9 N-m)
Length of torque wrench is 22 in. (558.8 mm) Length of adapter is 3 in. (76.2 mm)
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ENABLING LEARNING OBJECTIVE D
• ACTION: CONDUCT DISASSEMBLY AND ASSEMBLY OF THE M242 25-MM GUN.
• CONDITION: GIVEN A CLASSROOM ENVIRONMENT, A M242 25-MM GUN, TOOLS AND TM 9-1005-200-23&P.
• STANDARD: THE STUDENT WILL PERFORM DISASSEMBLY AND ASSEMBLY ON THE M242 25-MM GUN, IAW TM 9-1005-200-23&P.
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M242 RECEIVER ASSY
0026
0052
0058
0059
0067
0069
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M242 RECEIVER ASSY0023 0060
0026 0061
0052 0063
0053 0064
0058 0065
0059 0067
0049 0069
0050
0051
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M242 FEEDER ASSY
0037 0036
0038 0039
0031 0040
0033 0041
0034 0042
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0026 0038
0027 0031
0028 0033
0029 0030
0032 0039
0034 0040
0036 0041
0037 0042
0043
M242 FEEDER ASSY
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M242 BOLT & TRACK ASSY
0053
0054
0055
0056
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TERMINAL LEARNING OBJECTIVE
ACTION: CONDUCT ORGANIZATIONAL MAINTENANCE ON THE M242 25-MM CHAIN GUN.
CONDITION: IN A CLASSROOM ENVIRONMENT, GIVEN A TM 9-1005-200-23&P, M242 STUDENT HANDOUTS AND A M242 25-MM GUN WITH GUN STAND AND TOOLS.
STANDARD: STUDENT MUST ACHIEVE MINIMUM OF 80% ON BOTH WRITTEN EXAMS(OB/CB) AND RECEIVE A GO ON ALL HANDS ON EVALUATIONS.
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BOLT AND TRACK ASSEMBLY
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GUN,25MM,M242GUN, 25MM,M242 BIC 1ST BN, 29TH IN REGT
WL258BREPLACE BREECH ASSYAT 25,000RDS(ENH>25,000REPLACE FIRING PIN ASSY8,000 /12,000 RDS
M242 BFV SERIAL NUMBER 2AB4001 ALL ROUNDS HAVE A EFC OF 1.0
RECEIVER ASSY 5500 FIRING PIN 1
BREECH
13 AUG 94 8,00017,0008,000 CPT
30 AUG 94 8,030 16,9707,970
SSG
30 SEPT 948,080
TPDS-T
TPDS-T
30
50 16,9207,920
SSG
6 OCT 94 TP-T 800 8,880 16,1207,120
SSG
30 OCT 94 TP-T 47 8,927 16,0737,073
CPT
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IIIIIIIIIIIIIIIIIIIIIIIII
IIIIIIIIIIIIIIIIIII
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ELECTRICAL SYSTEM
PROVIDED-18-30 VDC
SAFETY- 2 VDC
O
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