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XM813 MAINTENANCE Flashcards

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1
Q

DUE TO THE WEIGHT OF THE BARREL, IT IS A ____________________.

A

3 PERSON LIFT

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2
Q

BARREL ASSEMBLY MAJOR COMPONENTS

A

-BARREL
-THERMAL SHROUD
-MUZZLE BREAK

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3
Q

WHEN SHOULD THE MUZZLE BREAK BE REMOVED?

A

IF DAMAGE OR CORROSION IS SUSPECTED. NOT FOR GENERAL CLEANING.

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4
Q

FAILURE TO CLEAN MUZZLE BRAKE WILL CAUSE ______________. THIS CAN BREAK OFF AND CAUSE INJURY.

A

CARBON BUILD UP

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5
Q

BARREL ASSEMBLY INSPECTIONS

A

-BARREL THREADS: CHECK FOR CROSS THREADING

-MUZZLE BRAKE: CHECK FOR CRACKS, CROSS THREADING AND IF FIRST BAFFLE IS WORN THROUGH

-THERMAL SHROUD: CHECK BUSHING FOR CRACKS OR CROSS THREADING

-MUZZLE BRAKE KEY: CHECK FOR CRACKS OR DEFORMATION

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6
Q

12 RECEIVER ASSEMBLY COMPONENTS

A

-RECEIVER ASSEMBLY
-BOLT CARRIER ASSEMBLY
-TRACK ASSEMBLY
-GUIDE ROD
-DRIVE SHAFT HANDLE
-SEAR RELEASE LEVER
-TRACK LATCH HANDLE
-MANUAL SAFE SWITCH
-BARREL LOCK PIN
-RECOIL MECHANISM
-DAMPER ASSEMBLY
-MECHANICAL ROUND COUNTER

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7
Q

MECHANICAL ROUND COUNTER

A

COUNTS NUMBER OF FIRED ROUNDS.

ACTUATED BY THE BREECH RECOIL.

DOES NOT COUNT RECORD DRY CYCLED ROUNDS

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8
Q

MOTOR DRIVE ASSEMBLY

A

1.5 HP 24 VDC MOTOR (18-30 VDC)

PROVIDES POWER, BASIC RATE OF FIRE AND TIMING FUNCTIONS

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9
Q

BREECH ASSEMBLY

A

LOCKS WITH THE BOLT AND BARREL TO CONTAIN THE FIRING PRESSURE

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10
Q

BARREL SUPPORT ASSEMBLY

A

TRANSFERS BARREL WEIGHT TO THE INTERNAL SUPPORT ASSAMBLY

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11
Q

CASE EJECT COVER

A

SPRING ACTUATED COVER TO KEEP DEBRIS AND FOREIGN OBJECTS FROM ENTERING THE GUN

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12
Q

BARREL SUPPORT BEARING SURFACE

A

PROVIDES FORWARD BEARING SURFACE FOR THE BARREL AND REAR MOUNTING FOR THE THERMAL SHROUD

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13
Q

RECEIVER FACE PLATE AND INTERNAL SUPPORT ASSEMBLY

A

BOLTS TO THE TURRET FROM OUTSIDE THE TURRET STRUCTURE. RECOIL LOADS ARE TRANSFERRED TO THE TURRET STRUCTURE THROUGH THE INTERNAL SUPPORT ASSEMBLY

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14
Q

RECEIVER

A

MOUNTING POINT FOR THE FEEDER ASSEMBLY, MOTOR AND OTHER ASSEMBLIES. DOES NOT RECOIL.

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15
Q

SEAR ASSEMBLY

A

CONTROLLED BY SEAR SOLENOID AND MECHANICAL INTERLOCK. LOCKS CHAIN IN EVENT OF MISFIRE, BY ENGAGING THE SAFETY LINK AND IN THE SEAR POSITION, BY ENGAGING THE MASTER LINK

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16
Q

SEAR CATCH ASSEMBLY

A

KEEPS CHAIN ASSEMBLY FROM REBOUNDING BACKWARDS AFTER CONTACTING SEAR

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17
Q

MECHANICAL INTERLOCK

A

ENGAGES SEAR TO STOP BOLT FROM BEING UNLOCKED FROM BREECH ASSEMBLY IF THERE IS NO RECOIL

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18
Q

HANDLE PIN

A

APPLIES SPRING TENSION TO LOCK FEEDER HANDLE ON ONE SIDE AND PROVIDES A LOCK ON THE OTHER SIDE

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19
Q

SEAR SOLENOID

A

PROVIDES ELECTRICAL CONTROL OF SEAR THROUGH THE RELEASE LINK AND SEAR PUSH ROD

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20
Q

RECEIVER SUBASSEMBLY

A

CONTAINS OR PROVIDES ATTACHMENT FOR ALL RECEIVER COMPONENTS AND SUBASSEMBLIES

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21
Q

DAMPER ASSEMBLY

A

HYDRAULICALLY DAMPENS THE COUNTER RECOIL FORCE WITH THE DAMPER VALVE ASSEMBLY. USES DOW-CORNING 510 FLUID

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22
Q

RECOIL MECHANISMS

A

USES SPRINGS TO ABSORB RECOIL LOADS

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23
Q

RECEIVER FACEPLATE

A

BOLTS TO OUTSIDE OF VEHICLE

TRANSFERS RECOIL LOADS TO TURRET STRUCTURES

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24
Q

FORWARD SEAR CATCH ASSEMBLY

A

RESTRAINS THE MASTER LINK FROM CYCLING BACKWARDS WHEN CYCLED TO SS READY POSITION

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25
INDICATOR VIEW PLUG
PROVIDES ACCESS TO VIEW DAMPER ASSEMBLY RESERVOIR INDICATOR ROD
26
BOLT AND CARRIER ASSEMBLY
CONVERTS ROTATIONAL MOVEMENT OF THE CHAIN TO LINEAR FOWARD AND REARWARD MOVEMENT
27
TRACK ASSEMBLY
ROTATES COUNTERCLOCKWISE TO DRIVE THE BOLT AND CARRIER ASSEMBLY
28
RECEIVER
HOLDS THE TRACK AND BOLT CARRIER ASSEMBLY IN PROPER ALIGNMENT TO THE BREECH
29
MECHANICAL INTERLOCK
STOPS BOLT IN SEAR IF MISFIRE OCCURS
30
GUIDE ROD
GUIDES THE BOLT CARRIER
31
TRACK ASSEMBLY COMPONENTS
-SAFETY PAWL -PIRING PIN PAWL -SAFETY LINK -MASTER LINK -IDLER SPROCKET SHAFTS AND IDLER GEARS -CLEVIS ASSEMBLY -DRIVE GEAR AND RETAINER -SAFETY ACTUATOR
32
SAFETY PAWL
PROHIBITS THE FIRING PIN FROM DROPPING WHEN THE SAFETY IS ENGAGED
33
FIRING PIN PAWL
COCKS THE FIRING PIN ASSEMBLY BY PROHIBITING THE FORWARD MOVEMENT OF THE FIRING PIN AS THE BOLT CARRIER MOVES FORWARD
34
SAFETY LINK
HELD BY THE SEAR TO STOP THE GUN IN SEAR POSITION IF THE ROUND DOES NOT FIRE
35
MASTER LINK
SLOTTED INTO THE BOLT CARRIER TO DRIVE THE BOLT CARRIER. STOPS THE GUN IN SEAR POSITION
36
IDLER SPROCKET SHAFTS AND GEARS
INTERCHANGEABLE NYLON GEARS AND INTERCHANGEABLE SHAFTS
37
CLEVIS ASSEMBLY
HOLDS TRACK IN RECEIVER BY MATING WITH THE TRACK HANDLE. PROVIDES ADJUSMENT FOR TRACK TENSION
38
DRIVE GEAR AND RETAINER
STEEL GEAR THAT DRIVES THE CHAIN. RETAINER RING HOLDS GEAR IN PLACE
39
SAFETY ACTUATOR
RAISES AND LOWERS THE SAFTEY PAWL WHEN MANIPULATING THE SAFTEY HANDLE
40
GREASE FOR THE XM813
MC1210
41
HEAVY COAT LUBRICATION
BASE METAL SHOULD NOT BE VISIBLE
42
MEDIUM COAT LUBRICATION
BASE METAL SHOULD BE OBSCURED BUT VISIBLE
43
LIGHT COAT LUBRICATION
GREASE SHOULD BE PRESENT BUT NOT VISIBLE
44
PARTS REQUIRING HEAVY COAT
-BREECH LOCKING LUGS -BOLT LUGS -FIRING PIN PAWL -SAFETY PAWL -ACTUATOR RODS -PUSH ROD EXTENSION AREA -UPPER AND LOWER CAMPIN SLOTS -RECEIVER RAIL GUIDE
45
PARTS REQUIRING MEDIUM COAT
-BOLT GUIDE ROD SLOT -GUIDE ROD -RECEIVER RAIL -BOLT CARRIER CROSS SLOT -FEEDER MOUNTING BUSHING -ROCKER ASSEMBLY -GUIDE LINK SLOT -FIRING PIN TANG -MECHANICAL INTERLOCK CONTACT
46
PARTS REQUIRING LIGHT COAT
-BOLT SHAFT -CHAIN AND SPROCKETS -OUTER BREECH AREA
47
DAMPER FLUID
DC 510-100
48
DAMPER FLUID LEVEL 1 INCH OF ROD IS VISIBLE
SHOULD BE SERVICED DURING REGULAR SCHEDULED MAINTENANCE
49
DAMPER FLUID LEVEL LESS THEN .4 INCH OF ROD IS VISIBLE OR LEAK IS IDENTIFIED
FORWARD DAMPER TO DIRECT SUPPORT MAINTENANCE FOR REBUILD
50
2 TYPES OF LOCKING WIRE
.020 IN ELECTRICAL CONNECTIONS .032 IN NON-ELECTRICAL CONNECTIONS
51
SERVICES TIMELINE
FEEDER- CONDUCT SERVICES ANNUALLY OR AS BROKEN OR DAMAGE PARTS REQUIRE RECEIVER-CONDUCT SERVICES EVERY 5 YEARS OR AS BROKEN OR DAMAGE PARTS REQUIRE
52
9 COMPONENTS OF THE FEEDER ASSEMBLY
-FEEDER -ROTOR ASSEMBLY -ROTOR SHIELD -BOLT POSITION INDICATOR -FEED SPROCKETS -FEEDER HANDLE -MANUAL DRIVE HUB -SHOULDERED SHAFTS -FEED STOPS
53
ABM HARNESS
TRANSMITS SIGNALS FROM THE GCU TO THE ABM SETTER COIL
54
CONTACT SETTER
200 RDS PER MIN AND ALLOWS MULTIPLE HANDSHAKES. ALLOWS 32 BYTES OF DATA TRANSFER
55
INDUCTIVE SETTER
120 RDS PER MIN AND ONLY ALLOWS A SIGNLE HANDSHAKE. ALLOWS 13 BYTES OF DATA TRANSFER
56
FEEDER DRIVE ASSEMBLY
LUBRICATED AND SEALED PORTION OF THE FEEDER. CONTAINS THE GEAR TRAIN AND ELECTRICAL COMPONENTS OF THE FEEDER ASSEMBLY
57
FORWARD FEED AREA
RECEIVES ROUNDS FROM TRANSFER UNIT AND FEEDS ROUNDS ONTO BOLT
58
ROTOR SHIELD
PREVENTS FOREIGN OBJECTS FROM ENTERING FEEDER ROTOR
59
LEAF SPRINGS
PREVENT EJECTIED CARTRIDGE FROM FALLING BACK INTO THE FEEDER WHEN FIRING AT ELEVATION
60
EJECTION CHUTE
CONTROLS THE SPENT CASE OR MSIFIRED ROUND DURING FORWARD EJECTION
61
INDEX DRIVE SHAFT
RECEIVES POWER FROM FEEDER GEAR CLUTCH
62
INDEX DRIVE ASSEMBLY
INCLUDES CAM SET AND ROTOR STUB. PROVIDES ROTOR OUTPUT OF 1/3 ROTATION (120 DEGREE ROTATION) DURING FEED DWELL TIME
63
BPI
GIVES VISUAL INDICATION OF THE BOLT POSITION
64
MANUAL DRIVE HUB
USED TO MANUALLY CYCLE THE GUN NOT USED FOR TIMING OR LOADING
65
FEED SHAFT STOPS
STOPS DESELECTED FEED SHAFT FROM ROTATING BACKWARDS DUE TO THE WEIGHT OF THE AMMO
66
FEED SELECT SOLENOID
PROVIDES MANUAL/ ELECTRICAL FEED PATH SELECTION
67
ROUND POSITION ASSEMBLY
TRANSFERS ROUND FROM FEED SPROCKET TO THE ROTOR
68
ROTOR ASSEMBLY
TRANSFERS ROUND ONTO BOLT FACE AND SPENT CASE INTO EJECTION SHUTE ROTATES 120 DEGREES OR 1/3 ROTATION PER CYCLE
69
MAGAZINE DRIVE SPUR GEARS
PROVIDE DRIVE POWER TO LINKLESS AMMO MAGAZINE
70
FEEDER WARNING
NEVER UPLOAD AMMUNITION USING HAND CRANK. A LIVE ROUND WILL BE PLACED INTO THE BOLT FACE AND WILL BE FIRED IF THE SAFETY IS OFF
71
TIME-ING WARNING
DO NOT USE MANUAL HAND CRANK TO TIME THE FEEDER. THIS WILL PROVIDE A MECHANICAL ADVANTAGE OVER THE GEARS AND CAUSE DAMAGE
72
FEED SHAFT STOPS
STOPS THE DESELECTED FEED SHAFT FROM ROTATING BACKWARDS DUE TO THE WEIGHT OF THE AMMUNITION
73
FEED SELECT SOLENOID
PROVIDES MECHANICAL AND ELECTRICAL SELECTION OF UPPER OR LOWER FEED PATH
74
SERVICES FOR THE FEEDER WILL BE CONDUCTED ___________ OR AS BROKEN OR DAMAGED PARTS REQUIRE
ANUALLY
75
CYCLES OF FUNCTION
-CLOSED BOLT -HOT GUN -WARM GUN -SS READY
76
CLOSED BOLT
1. SEAR 2. EXTRACT 3. OB SEAR 4. FEED 5. RAM 6. SS READY 7. FIRE 8. DWELL
77
FUNCTIONS SEAR
BOLT LOCKED IN BREACH FEED SELECT IS AVAILABLE WHEN FIRING OPEN BOLT, GUN WILL STOP IN SEAR IF MISFIRE OCCURS
78
FUNCTIONS EXTRACT
UNLOCK, REMOVE SPENT CASE OR MISFIRED ROUND
79
FUNCTIONS OPEN BOLT SEAR
LOCKED IN OB SEAR. NEXT ROUND IS ALREADY COMMITTED IN AUTOMATIC, GUN WILL BYPASS OB SEAR WITHOUT STOPPING
80
FUNCTIONS FEED
BOLT AT REAR, ROTOR PLACES NEW ROUND IN BOLT FACE PREVIOUSLY SPENT CASE IS PLACED IN FRONT OF EJECTOR ROD
81
FUNCTIONS RAM
CHAMBERS ROUND IN BREECH. EJECTS SPENT CASE
82
FUNCTIONS SS READY
BOLT SEATED IN BREECH BUT NOT LOCKED. PROVIDES TIME FOR TRIGGER AND PROPELLANT TO MATCH EXECUTION.
83
FUNCTIONS FIRE
BOLT LOCKS AND FIRING PIN SPRING IS RELEASED
84
FUNCTIONS DWELL
PROVIDES TIME FOR BARREL AND BREECH TO RECOIL, COUNTER RECOIL AND HANGFIRE PROTECTION DWELL TIME OF .7 SECONDS FOR HANGFIRE PROTECTION
85
HOT GUN
WHEN GUN REACHES FIRING RATE OF MORE THAN 100 ROUNDS PER 30 MINS OR 3.33 RDS PER MIN WHILE IN HOT STATUS, ANY MISIFRE WILL RESULT IN CYCLING TO OB SEAR AFTER .5 SEC DELAY
86
WARM GUN
120 RDS FIRE IN 30 MINUTES OR LESS CYCLE BEGINS IN OB SEAR WILL CAUSE DUMP (HE TO AP) OR OVERSHOOT RDS (AP TO HE)
87
SS READY
CYCLE BEGINS IN SS READY ALLOWS FOR REDUCED COINCEDENCE WINDOW FIRING
88
IMMEDIATE ACTION WHEN GUN IS HOT AND FAILS TO FIRE
1. DETERMINE IF COOKOFF DANGER EXISTS (MORE THAN 100 RDS FIRED AND GUN JAMMED IN YELLOW IN BPI) 2. CREW EXIT AREA IMMEDIATELY 3. POINT GUN IN SAFE DIRECTION DOWNRANGE 4. TURN ARMED AND POWER SWITCHES OFF 5. EXIT AREA, STAY CLEAR OF BARREL 6. STAY CLEAR FOR 60 MINUTES OR UNTIL COOKOFF
89
IMMEDIATE ACTION FOR CLEARING RECEIVER JAMS
CYCLE GUN FORWARD OR BACKWARDS TO OB SEAR FORWARD IF BOLT HAS ALREADY LOCKED, USUALLY SPENT ROUND PRESENT BACKWARDS IF BEFORE BOLT HAS LOCKED, USUALLY UNSPENT ROUND PRESENT
90
IMMEDIATE ACTION FOR CLEARING FEEDER JAMS
1. TURN TURRET AND GUN POWER OFF, ENGAGE SAFETY STOP, ENSURE MANUAL SAFE 2. ROTATE DRIVESHAFT BACKWARDS TO RELIEVE BINDING 3. IF FEED ZONE JAMMED, LIFT BOTH FEED SHAFT STOPS, CHANGE FEED SELECTION AND USE 14MM RATCHET TO BACK AMMO INTO MAGAZINE 4. CYCLE GUN MECHANICALLY OR ELECTRICALLY DO NOT REMOVE FEEDER FROM BPI WHILE IN FEED ZONE
91
IMMEDIATE ACTION FOR STUCK CASE OR DRY BOLT SEIZURE
1. ATTEMPT TO ROTATE SHAFT. IF IN SEAR OR OB SEAR, UTILIZE SEAR RELEASE LINK 2. IF JAM CANNOT BE CLEARED, REMOVE FEEDER 3. PLACE WRENCH ON BOLT FLATS AND ROTATE WHILE TURNING VERTICAL DRIVE SHAFT 4. IF BOLT IS UNLOCKED FROM BREECH AND CASE IS STILL STUCK AND VERIFIED AS SPENT CASE USING STENCIL ON CLEANING ROD, SLAM CASE WITH CLEARING ROD

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