Reporting Errors And Recommending Improvements

You can help improve this publication. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Submit your DA Form 2028 (Recommended Changes to Publications and Blank Forms), through the Internet, on the Army Electronic Product Support (AEPS) website. The Internet address is http://aeps.ria.army.mil. If you need a password, scroll down and click on "ACCESS REQUEST FORM". The DA Form 2028 is located in the ONLINE FORMS PROCESSING section of the AEPS. Fill out the form and click on SUBMIT. Using this form on the AEPS will enable us to respond quicker to your comments and better manage the DA Form 2028 program. You may also mail, fax, or E-mail your letter or DA Form 2028 direct to: AMSTA-LC-CI/TECH PUBS, TACOM-RI, 1 Rock Island Arsenal, Rock Island, IL 612997630. The email address is [email protected]. The fax number is DSN 793-0726 or Commercial (309) 782-0726. Marine Corps users, submit NAVMC 10772 to: Commanding General, Marine Corps Logistics Base (Code 850), Albany, GA 31704-5000. A reply will be furnished to you.

DISTRIBUTION STATEMENT C. Distribution authorized to US Government agencies and their contractors. This publication is required for administration and operational purposes, as determined 2 February 1987. Other requests for this document shall be referred to Commander, U.S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-LC-CIP-WT, Rock Island, IL 61299-7630.

WARNING. This document contains export-controlled technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C. sec 2751 et seq) or Executive Order 12470. Violations of these export laws are subject to severe criminal penalties.

DESTRUCTION NOTICE. For unclassified, limited documents, destroy by any method that will prevent disclosure of contents or reconstruction of the document.

*This manual supersedes TM 9-1005-200-20&P, dated May 1992, including all changes, and TM 9-1005-200-30&P, dated August 1992, including all changes.

**This manual supersedes TM 08672A-20&P/1, dated May 1992, including all changes, and TM 08672A-30&P/2, dated August 1992, including all changes.

WARNING SUMMARY HOW TO USE THIS MANUAL

GENERAL INFORMATION 0001 00

CHAPTER 1. DESCRIPTION AND THEORY OF OPERATION

Equipment Description and Data 0002 00

Theory of Operation 0003 00

CHAPTER 2. UNIT TROUBLESHOOTING PROCEDURES

Troubleshooting Index 0004 00

Electrical Checkout 0005 00

Automatic Gun Feeder Electrical Check 0006 00

Automatic Gun Feeder Manual Cycle Check 0007 00

Auto Gun Receiver Manual Cycle Check 0008 00

Gun Fires at Reduced Rate 0009 00

Gun Will Not Cycle 0010 00

Gun Will Not Stop in Sear Position 0011 00

Gun Stalls 0012 00

Gun Cycles But Will Not Fire 0013 00

Gun Fires With Safety On 0014 00

Excessive Recoil or Inadequate Damping 0015 00

Gun Fires Intermittently or at Irregular Rate 0016 00

Gun Fires Without Hangfire Protection 0017 00

CHAPTER 3. DIRECT SUPPORT TROUBLESHOOTING PROCEDURES

Feeder Drive Assembly Manual Cycle and Electrical Check 0018 00

CHAPTER 4. UNIT MAINTENANCE INSTRUCTIONS

Service Upon Receipt 0019 00

Preventive Maintenance Checks and Services Introduction 0020 00

Unit Preventive Maintenance Checks and Services, Including Lubrication

Instructions 0021 00

General Maintenance 0022 00

Barrel Assembly Removal/Installation 0023 00

Barrel Assembly Disassembly/Assembly 0024 00

Feed Chute Latch Pins Removal/Installation 0025 00

Automatic Gun Feeder Removal/Installation 0026 00

Link Bridge Removal/Installation 0027 00

Link Cover Assembly Removal/Installation 0028 00

Link Shield Removal/Installation 0029 00

Forward Link Stripper Removal/Installation 0030 00

Rear Link Stripper Removal/Installation 0031 00

Ejection Chute Removal/Installation 0032 00

Forward Feeder Gate Removal/Installation 0033 00

Forward Feed Assembly and Cartridge Guide Removal/Installation 0034 00

Forward Feed Assembly Disassembly/Assembly 0035 00

Feeder Assembly Rotor Removal/Installation 0036 00

Round Positioner Assembly Removal/Installation 0037 00

Round Positioner Assembly Disassembly/Assembly 0038 00

CHAPTER 4. UNIT MAINTENANCE INSTRUCTIONS - Continued

Upper and Lower Feed Sprocket Assemblies Removal/Installation 0039 00

Feeder Standoff Removal/Installation 0040 00

Stepped Spacer Removal/Installation 0041 00

Upper Eject Guide Removal/Installation 0042 00

Feed Shaft Stops Removal/Installation 0043 00

Feed Shaft Stop Assemblies Disassembly/Assembly 0044 00

Electrical Feed Select Solenoid PN 12524181 Removal/Installation 0045 00

Electrical Feed Select Solenoid Body Removal/Installation 0046 00

Electrical Feed Select Solenoid Wiring Harness Replacement 0047 00

Feeder Handle Disassembly/Assembly 0048 00

Recoil Mechanism Removal/Installation 0049 00

Barrel Support Assembly Removal/Installation 0050 00

Breech Assembly Removal/Installation 0051 00

Electrical Sear Solenoid Removal/Installation 0052 00

Bolt and Track Assembly Removal/Installation 0053 00

Bolt and Track Assembly Disassembly/Assembly 0054 00

Bolt and Carrier Assembly Disassembly/Assembly 0055 00

Track Assembly Removal/Installation 0056 00

Rear Track Removal/Installation 0057 00

Track Hook Latch Removal/Installation 0058 00

Latch Bracket Removal/Installation 0059 00

Straight Drive Shaft Removal/Installation 0060 00

Direct Current Motor Removal/Installation 0061 00

Handle Pin Removal/Installation 0062 00

Cover Assembly and Sear Retractor Assembly Removal/Installation 0063 00

Sear Catch Assembly Removal/Installation 0064 00

Sear Assembly Removal/Installation 0065 00

Sear Assembly Disassembly/Assembly 0066 00

Clutch Assembly and Auto Gun Receiver Gears Removal/Installation 0067 00

Clutch Assembly Disassembly/Assembly 0068 00

Chain Guides and Mechanical Interlock Disassembly/Assembly 0069 00

Preparation for Storage or Shipment of Barrel Assembly 0070 00

Preparation for Storage or Shipment of Feeder Assembly 0071 00

Preparation for Storage or Shipment of Receiver Assembly 0072 00

CHAPTER 5. DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

Feeder Drive Assembly and Worm Shaft Assembly Disassembly/Assembly 0073 00

Rear Plate Assembly and Feed Plate Assembly Disassembly/Assembly 0074 00

Upper and Lower Clutch Assemblies Disassembly/Assembly 0075 00

Gear Clutch Assembly Disassembly/Assembly 0076 00

Feeder Housing Assembly Disassembly/Assembly 0077 00

Index Drive Cover Assembly Disassembly/Assembly 0078 00

Recoil Mechanism Disassembly/Assembly 0079 00

Damper Housing Assembly and Fluid Pressure Damper

Disassembly/Assembly 0080 00

General Maintenance — Threaded Insert Replacement 0081 00

Illustrated List of Manufactured Items 0082 00

CHAPTER 6. SUPPORTING INFORMATION

References 0083 00

Introduction For Standard Format Maintenance Allocation Chart (MAC) 0084 00

Maintenance Allocation Chart (MAC) 0085 00

Introduction to Repair Parts and Special Tools List (RPSTL) 0086 00

GROUP 00 M242 25-MM Automatic Gun with BII 12524000 and

M242 25-MM Enhanced Automatic Gun with BII

12524600 0087 00

GROUP 001 M242 25-MM Automatic Gun 12524008 and M242

25-MM Enhanced Automatic Gun 12524008-1 0088 00

GROUP 0011 Barrel Assembly 12524520 0089 00

GROUP 0012 Automatic Gun Feeder 12524100 and Enhanced

Automatic Gun Feeder 12524100-1 0090 00

GROUP 00121, Feeder Drive Assembly 12524180 and Electrical Solenoid

0012101 Assembly 12524404 0091 00

GROUP 00121011, Wiring Harness 12524403 and Connector 12524644 0092 00

001210111

GROUP 0012102 Rear Plate Assembly 12524575 0093 00

GROUP 00121021 Feed Plate Assembly 12524191 0094 00

GROUP 0012103 Worm Shaft Assembly 12524250 0095 00

GROUP 0012104 Feed Shaft Stop Assembly (Short) 12524170 0096 00

GROUP 0012105, Sliding Sleeve Lower Clutch 12524083 and Sliding Sleeve

0012106 Upper Clutch 12524290 0097 00

GROUP 0012107 Gear Clutch Assembly 12524099 0098 00

GROUP 0012108 Housing Assembly 12524210 0099 00

GROUP 0012109 Index Drive Cover Assembly 12524260 0100 00

GROUP 00122 Forward Feed Assembly 12524574 0101 00

GROUP 00123 Round Positioner Assembly 12524524 0102 00

GROUP 0013, Auto Gun Receiver 12524300, Enhanced Auto Gun

00131, 00134 Receiver 12524301, Mechanical Housing 12524362, and Rocker Assembly 12524463 0103 00

GROUP 00132 Bolt and Track Assembly 12524340 0104 00

GROUP 0013201 Bolt and Carrier Assembly 12524320 0105 00

GROUP 0013202 Track Assembly 12524380 0106 00

GROUP 00133 Recoil Mechanism 12524420 and Enhanced Recoil

Mechanism 12524530 0107 00

GROUP 0013301, Damper Housing Assembly 12524425, Enhanced 0013302 Damper Housing Assembly 12524533, and Fluid

Pressure Damper 12524438 0108 00

GROUP 00135 Clutch Assembly (Double Spring) 12524146

and Enhanced Clutch Assembly (Triple Spring)

12524542 0109 00

GROUP 00136 Sear Assembly 12524089 0110 00

GROUP 00137 Breech Assembly 12524370 and Enhanced Breech

Assembly 12524527 0111 00

GROUP 00138 Riveted Receiver 12524360 and Enhanced Riveted

Receiver 12524364 0112 00

Special Tools 0113 00

National Stock Number Index 0114 00

Part Number Index 0115 00

Expendable And Durable Items List 0116 00

INDEX

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