TM_M113 A2 (TM9-2350-261-24P)

ALPHABETICAL INDEX Page
A

Aiming Post Light M14
Battery Replacement .................................................................................................................................................... 3-10

Ammunition ....................................................................................................................................................................... 4-1
Assembly and Preparation for Firing

Boresighting with Sightunit M53 Series ........................................................................................................................ 2-41
Emplacement of Mortar ................................................................................................................................................ 2-24
Installation of Instrument Light M53E1 for Night Operation.......................................................................................... 2-39
Installation of Sightunit M53 Series on Mortar.............................................................................................................. 2-35

B

Barrel Marking ................................................................................................................................................................... 3-12

C

Care and Handling of Cartridges....................................................................................................................................... 4-16
Carrier

Operation of 81-mm Mortar on
Firing from Carrier ........................................................................................................................................................ 2-95
General......................................................................................................................................................................... 2-94
Cartridge, M68................................................................................................................................................................... 4-11

Change 3 Index 0

Page

Cartridges, Care and Handing of.................................................................................................................................. 4-16
Cartridges, HE

M362 andM32A1 ..................................................................................................................................................... 4-4
M374, M374AI ,and M374A2................................................................................................................................... 4-3
M374A3 ................................................................................................................................................................... 4-2
Cartridges, Illuminating
M301A1 and M301A2.............................................................................................................................................. 4-10
M30IA3 .................................................................................................................................................................... 4-9
Cartridge, Practice
M880........................................................................................................................................................................ 4-10.4
Cartridges, WP Smoke
M57and M57A1 ....................................................................................................................................................... 4-8
M370........................................................................................................................................................................ 4-7
M375, M37SA1, and M375A2 ................................................................................................................................. 4-6
M375A3 ................................................................................................................................................................... 4-5
Controls and Indicators, Description and Use of Operators ......................................................................................... 2-0

Change 5 Index 1

Page
D

Data Equipment............................................................................................................................................................ 1-9
Description and Use of Operator’s Controls and Indicators ......................................................................................... 2-0
Description, Equipment ................................................................................................................................................ 1-3
Dismounting the Mortar from M125A1/A2 Carrier ........................................................................................................ 2-116

E

Equipment Characteristics, Capabilities, and Features................................................................................................ 1-3
Equipment Data............................................................................................................................................................ 1-9
Equipment Description ................................................................................................................................................. 1-3

F

Firing, Assembly and Preparation for
Boresighting with Sightunit M53 Series ................................................................................................................... 2-41
Emplacement for Mortar.......................................................................................................................................... 2-24
Installation of Instrument Light M53E1 for Night Operation..................................................................................... 2-39
Installation of Sightunit M53 Series on Mortar......................................................................................................... 2-35

Index 2

Page

Firing or Dismounting, Releasing Mortar for................................................................................................................. 2-94
Firing, Preparation for................................................................................................................................................... 4-13
Foreign Ammunition (NATO)........................................................................................................................................ 5-1
Fuze Types, PD

M524 Series ............................................................................................................................................................ 4-20
M525 Series ............................................................................................................................................................ 4-20
M526 Series ............................................................................................................................................................ 4-20.1
M567 Series ............................................................................................................................................................ 4-20.1
M775........................................................................................................................................................................ 4-19
Fuze Types, Time
M84 Series .............................................................................................................................................................. 4-20.2
fuse Types, VT
M532........................................................................................................................................................................ 4-20.2

G

General Information...................................................................................................................................................... 1-1

Change 5 Index 3

Page
H

Hand Receipt (-HR) Manuals ....................................................................................................................................... 1-2
Hatch Cover Operation, Mortar .................................................................................................................................... 2-85
HE Cartridges

M362 and M362A1 .................................................................................................................................................. 4-4
M374, M374A, and M374A2.................................................................................................................................... 4-3
M374A3 ................................................................................................................................................................... 4-2

I

Illuminating Cartridges
M301A1 and M301A2.............................................................................................................................................. 4-10
M301A3 ................................................................................................................................................................... 4-9

Information, General..................................................................................................................................................... 1-1
Installation of Fuze ....................................................................................................................................................... 4-21
Instructions, Lubrication ............................................................................................................................................... 3-0
Instructions, Maintenance ............................................................................................................................................ 3-0
Instruction, Operating ................................................................................................................................................... 2-0

Change Index 4

Page

Instrument Light M53E1
Battery Replacement ............................................................................................................................................... 3-8
Lamp Replacement ................................................................................................................................................. 3-9

Introduction................................................................................................................................................................... 1-1

L

Light M53E1, Instrument
Battery Replacement ............................................................................................................................................... 3-8
Lamp Replacement ................................................................................................................................................. 3-9

Location and Description of Major Components .......................................................................................................... 1-4
Lubrication Instructions ................................................................................................................................................ 3-0

M

Maintenance Forms and Records ................................................................................................................................ 1-1
Maintenance Instructions ............................................................................................................................................. 3-0
Maintenance Procedures ............................................................................................................................................. 3-7
Major Components, Location and Description of ......................................................................................................... 1-4
Marking, Barrel ............................................................................................................................................................. 3-12

Index 5

Page

Misfire
Cartridge Removal Procedure ................................................................................................................................. 2-102
If Cartridge Cannot be Removed from Cannon....................................................................................................... 2-115

81-mm Mortar, Turntable Controls ............................................................................................................................... 2-88
Mortar Hatch Cover Operation ..................................................................................................................................... 2-85
Mounting the 81-mm Mortar on the M125A1/A2 Carrier .............................................................................................. 2-90
M14, Aiming Post Light

Battery Replacement ............................................................................................................................................... 3-10
M125A1/A2 Carrier, Dismounting the Mortar from ....................................................................................................... 2-116
M125A1/A2 Carrier, Mounting the 81-mm Mortar on the ............................................................................................. 2-90
M125A1/A2 Carrier, Operation of 81-mm Mortar M29A1 Mounted on......................................................................... 2-84

0

Operating Instructions .................................................................................................................................................. 2-0
Operating Procedures

Emplacing Aiming Posts for Indirect Fire ................................................................................................................ 2-58
Loading and Firing................................................................................................................................................... 2-64
Log Book Entries after Firing ................................................................................................................................... 2-65

Index 6

Page

Misfire ...................................................................................................................................................................... 2-66
Operation of Sightunit M53 Series........................................................................................................................... 2-59
Operation of 81-mm Mortar on Carrier
Firing from Carrier ................................................................................................................................................... 2-95
General.................................................................................................................................................................... 2-94
Operation of 81-mm Mortar M29A1 Mounted on M125A1/A2 Carrier.......................................................................... 2-84
Operation under Unusual Conditions ........................................................................................................................... 2-81
Operation under Usual Conditions ............................................................................................................................... 2-24
Operator/Crew Preventive Maintenance Checks and Services ................................................................................... 2-7
Optical Parts - Care and Cleaning................................................................................................................................ 3-14

P

PD Fuze Types
M524 Series ............................................................................................................................................................ 4-20
M525........................................................................................................................................................................ 4-20
M526 Series ............................................................................................................................................................ 4-20.1
M567........................................................................................................................................................................ 4-20.1
M775........................................................................................................................................................................ 4-19

Change 5 Index 7

Page

Preparation for Firing.................................................................................................................................................... 4-13
Preparation for Movement - Disassembling Mortar and Equipment ............................................................................ 2-74
Preventive Maintenance Checks and Services (PMCS) .............................................................................................. 2-6
Principles of Operation, Technical................................................................................................................................ 1-11
Procedures, Maintenance ............................................................................................................................................ 3-7
Procedures, Operating

Emplacing Aiming Posts for Indirect Fire ................................................................................................................ 2-58
Loading and Firing................................................................................................................................................... 2-44
Log Book Entries after Firing ................................................................................................................................... 2-65
Misfire ...................................................................................................................................................................... 2-66
Operation of Sightunit M53 Sees............................................................................................................................. 2-59
Procedures, Troubleshooting ....................................................................................................................................... 3-3
Propelling Charge
M2A1 ....................................................................................................................................................................... 4-30
M5............................................................................................................................................................................ 4-30
M90.......................................................................................................................................................................... 4-30
M90A1 ..................................................................................................................................................................... 4-30
M185........................................................................................................................................................................ 4-30
M205........................................................................................................................................................................ 4-30

* U.S. GOVERNMENT PRINTING OFFICE: 1996-746-045/20085 PIN: 058919-005
Index 8 Change 5

Page

R

Records, Maintenance Forms and ............................................................................................................................... 1-1
Releasing Mortar for Firing or Dismounting.................................................................................................................. 2-94
Reporting Equipment Improvement Recommendations (EIR’s) .................................................................................. 1-2

S

Scope ........................................................................................................................................................................... 1-1
Securing Mortar for Traveling....................................................................................................................................... 2-93

T

Technical Principles of Operation................................................................................................................................. 1-11
Traveling, Securing Mortar for...................................................................................................................................... 2-93
Troubleshooting............................................................................................................................................................ 3-4
Troubleshooting Procedures ........................................................................................................................................ 3-3
Turntable Controls, 81 -mm Mortar .............................................................................................................................. 2-88

Index 9

Page

U

Unusual Conditions, Operation Under.......................................................................................................................... 2-81
Usual Conditions, Operation Under.............................................................................................................................. 2-24

V
VT Fuze Type

M532........................................................................................................................................................................ 4-20.2

Index 10

By Order of the Secretary of the Army:

CARL E. VUONO
General, United States Army

Chief of Staff

Official:

R. L. DILWORTH
Brigadier General, United Stales Army

The Adjutant General

Distribution

To be distributed in accordance with DA Form 12-40, Operator’s Maintenance requirements for Mortar, 81-MM, M29,
M29A1.



PIN: 058919-000