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XM813 MAINT Flashcards

(56 cards)

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1
Q

COMPONENTS OF THE BARREL ASSY

A
  • BARREL
  • THERMAL SHROUD
    -MUZZLE BAKE
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2
Q

BARRELL IS A _________ PERSON LIFT

A

3 PERSON LIFT

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3
Q

FAILURE TO CLEAN MUZZLE BRAKE VENTS WILL…

A

CAUSE CARBON BUILDUP. CARBON CAN BREAK OFF AND FUCK PEOPLE UP

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4
Q

DO NOT REMOVE MUZZLE BRAKE FOR______ _______

A

GENERAL CLEANING

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5
Q

REMOVE MUZZLE BRAKE IF ______ OR ______ IS SUSPECTED

A

DAMAGE

CORROSION

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6
Q

WHA DOES THE ROUND COUNTER ASSY DO?

A

Mechanical counter which is actuated by the recoiling breech.

DOES NOT record dry cycled rounds.

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7
Q

WHAT IS THE FUNCTION OF THE BARREL SUPPORT ASSY? (BSA)

A

Transfers barrel weight to the internal support assembly

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8
Q

WHAT IS THE PURPOSE OF THE CASE EJECT COVER?

A

to keep debris or foreign objects from entering the gun through case ejection path

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9
Q

WHAT DOES THE 14 PIN COONECTOR MATE WITH?

A

Mates with the feed select solenoid when the feeder handle is lowered

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10
Q

FUNCTION OF THE BREECH ASSY?

A

Locks with the bolt and barrel to contain the firing pressure

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11
Q

WHAT IS THE SEAR ASSY CONTROLLED BY?

A

Controlled by sear solenoid and mechanical interlock.

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12
Q

WHAT IS THE FUNCTION OF THE SEAR ASSY?

A

Locks chain assembly in event of misfire, by engaging the safety link.

In the sear position, by engaging the master link.

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13
Q

Sear Catch Assembly

A

Keeps chain assembly from rebounding backward after contacting sear.

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14
Q

Mechanical Interlock

A

Engages sear to stop bolt from being unlocked from breech assembly if there is no recoil (round misfires or hangfires).

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15
Q

Rocker Assembly

A

When pushed down by the breech recoiling, it then pulls the operating rod assembly.

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16
Q

Operating Rod Assembly

A

Pulled forward by the rocker assembly which pushes the push rod extension upward disengaging the interlock crank

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17
Q

Pushrod Extension

A

Forced upward disengaging the interlock crank.

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18
Q

Interlock Crank

A

When disengaged, unlocks the sear assembly

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19
Q

Sear Pushrod

A

Allows the electrical sear solenoid to pull the sear assembly out of the path of the safety link to allow normal gun function to occur.

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20
Q

Sear Assembly

A

Locks chain in the event of misfire by engaging the safety link.

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21
Q

Sear Retractor Assembly

A

Provides a means to manually disengage the sear during manual emergency operation.

NOT USED FOR XM813 OR MK44S

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22
Q

Handle Pin

A

Applies spring tension to lock feeder handle on one side and provides a lock on the opposite side.

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23
Q

Sear Solenoid

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A

Provides electrical control of sear through the release link and sear push rod.

24
Q

Receiver Subassembly

Study These Flashcards
A

Contains or provides attachment for all receiver components and subassemblies.

25
1.5 HP 24 VDC Motor Assembly Function and Purpose
-Drives gears and mechanisms required to operate gun. The enhanced gun direct current motor provides a jumper connection that enables vehicle BIT. -Provides 18-30 VDC, average of 24 VDC, and rated for 28 VDC. -Provides the power and the basic rate-of-fire timing functions
26
Receiver Gears Names
- Cluster Gear - Bevel Gears - Drive Gear Assy - Drive Sprocket Shaft - Pressed Bearings
27
Damper Assembly
Hydraulic damper valve controls counter-recoil forces
28
Recoil Mechanisms (2ea)
Uses ring springs to absorb recoil loads
29
Mechanical Interlock (Safety Interlock, or anti-hangfire System)
Stops gun in SEAR position by engaging sear assembly if gun does not experience recoil
30
Forward Sear Catch Assembly
Restrains the master link from cycling backwards when cycled to SS Ready position
31
SEAR Catch Assembly (REAR)
Restrains the master and safety links from cycling backwards
32
Indicator View Plug
Provides access to view damper assembly reservoir indicator rod
33
Feeder Mount Bushing
Forward mounting point for the feeder assembly
34
Handle Pin
When feeder handle is lowered, the receiver handle pin is moved to lock into feeder
35
SEAR ASSY SPRING PINS: What do you check for if gun will not release from SEAR or OB SEAR position?
Check for damaged spring pins
36
Guide Rod
Guides the Bolt Carrier. Pull it out to remove the bolt and carrier assembly
37
Track Assembly
Houses the safety mechanism and firing pawl. The chain rotates counterclockwise to drive the bolt and carrier assembly.
38
Bolt & Carrier Assembly
Converts the rotational movement of the chain, to linear forward and rearward movement. Rides on the left side receiver rail and the guide rod. Houses the firing pin assembly.
39
Receiver
Holds the track & bolt carrier assembly in proper alignment to the Breech.
40
Track Assembly: Safety Pawl
Prohibits the firing pin from dropping when the safety is engaged (SAFE Position).
41
Track Assembly: Firing Pin Pawl
Cocks the firing pin assembly by prohibiting the forward movement of the firing pin as the bolt carrier moves forward.
42
Track Assembly: Safety link
Held by the sear to stop the gun in SEAR position if the round does not fire (misfired round).
43
Track Assembly Master Link/Guide
Slider is seated into the bolt carrier cross-slot to drive the bolt carrier. Master link is held by the sear to stop the gun in SEAR position.
44
Idler Sprocket Shafts and Idler Gears
Interchangeable nylon gears. Shafts are also interchangeable. Ensure that shaft spring pins are seated in grooves before installing track.
45
Clevis Assembly
Holds track in receiver by mating with the track handle and provides adjustment for track latch tension.
46
Drive Gear and Retainer
Steel gear drives the chain. Retainer ring holds gear in place during installation of track
47
Safety Actuator
Rotating the safety handle causes the safety actuator to rotate which raises and lowers the safety pawl.
48
GREASE: HEAVY COAT
When instructed to apply a heavy coat of grease the base metal of the part should not be visible through grease.
49
GREASE: MED COAT
When instructed to apply a medium coat of grease the base metal of the part should be obscured but visible through grease.
50
GREASE: Light Coat
When instructed to apply a light coat of grease the base metal of the part should be visible through grease.
51
Parts requiring HEAVY COAT
-BOLT (avoid bolt face) -Upper and Lower Cam Pin slots -Breach locking lugs - Firing pin pawl/ Safety pawl -Actuator rods -Push rod ext. area -Outer edge of track
52
Parts requiring MEDIUM COAT
-Guide rod slot on BCA/ Guide rod -Inside the track on BCA -Receiver Rail -Rocker ASSY
53
Parts requiring LIGHT COAT
-Neck of bolt -Breech, avoid inside of breech -Chain and Sprockets
54
Recoil Mechanism
Ring Springs absorb recoil forces. Remaining loads are transferred through barrel support assembly to the turret. 
55
Damper Assembly
Hydraulically dampens the counter recoil force with the damper valve assembly. **Uses Dow-Corning 510 Fluid**
56
When checking Damper Fluid Level
- If less than half, 1.0 inch (25.4 mm) of rod is visible, damper assembly should be serviced during scheduled maintenance. - Standard Fluid is DC 510-100 - If less than 0.4 inch (10.0 mm) of rod is visible, forward damper assembly to Direct Support Maintenance for rebuild. - If leakage of fluid is identified during removal, forward damper assembly to Direct support Maintenance for rebuild.

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