US Army M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual – Volume 5 (TM 9-2320-272-23-5)

Description

Comprehensive Tactical Truck Technical Guidance

Maintain, troubleshoot, and overhaul critical field-level systems with the authoritative US Army M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual – Volume 5 (TM 9-2320-272-23-5). Jointly issued by Headquarters, Departments of the Army and the Air Force (Air Force TO 36A12-1C-1155-2-5) and dated 10 September 2012, this publication provides complete field maintenance procedures for tactical wheeled platforms across cargo, dump, tractor, expansible van, and medium wrecker configurations. Superseding previous TM 9-2320-272-24 series editions, Volume 5 delivers 640 pages of exhaustive work packages detailing special mission kits, Central Tire Inflation System (CTIS) pneumatic controls, compressed air valves, electrical charging and warning harnesses, full lubrication orders, standard torque tables, maintenance allocation charts, and 14 large-format foldout wiring and air supply diagrams.

Document & File Details

• Publication Title: Technical Manual Field Maintenance Manual for Truck, 5-Ton, 6×6, M939, M939A1, and M939A2 Series Trucks (Diesel) – Volume 5
• Publication Numbers: Army TM 9-2320-272-23-5 / Air Force TO 36A12-1C-1155-2-5
• Publishing Authority: Headquarters, Departments of the Army and the Air Force
• Publication Date: 10 September 2012
• Page Count: 640 pages
• Manual Scope: Volume 5 of 5 (comprising Chapter 10 Maintenance Instructions and Chapter 11 Supporting Information)
• File Format: Portable Document Format (PDF)
• Distribution Authorization: Distribution Statement A – Approved for public release; distribution is unlimited
• Language: English

Complete Coverage of Models & Equipment Variants

This volume provides direct maintenance instructions and servicing allocations for all naturally aspirated diesel (Cummins NHC 250) and turbocharged diesel (Cummins 6CTA8.3) variants in the 5-ton 6×6 tactical fleet:

• Cargo Dropside Trucks: M923 (NSN 2320-01-050-2084), M923A1 (NSN 2320-01-206-4087), M923A2 (NSN 2320-01-230-0307), M925 with Winch (NSN 2320-01-047-8769), M925A1 with Winch (NSN 2320-01-206-4088), M925A2 with Winch (NSN 2320-01-230-0308)
• Cargo Extra-Long Wheelbase (XLWB) Trucks: M927 (NSN 2320-01-047-8771), M927A1 (NSN 2320-01-206-4089), M927A2 (NSN 2320-01-230-0309), M928 with Winch (NSN 2320-01-047-8770), M928A1 with Winch (NSN 2320-01-206-4090), M928A2 with Winch (NSN 2320-01-230-0310)
• Dump Trucks: M929 (NSN 2320-01-047-8756), M929A1 (NSN 2320-01-206-4079), M929A2 (NSN 2320-01-230-0305), M930 with Winch (NSN 2320-01-047-8755), M930A1 with Winch (NSN 2320-01-206-4080), M930A2 with Winch (NSN 2320-01-230-0306)
• Tractor Trucks: M931 (NSN 2320-01-047-8753), M931A1 (NSN 2320-01-206-4077), M931A2 (NSN 2320-01-230-0302), M932 with Winch (NSN 2320-01-047-8752), M932A1 with Winch (NSN 2320-01-205-2684), M932A2 with Winch (NSN 2320-01-230-0303)
• Expansible Van Trucks: M934 (NSN 2320-01-047-8750), M934A1 (NSN 2320-01-205-2682), M934A2 (NSN 2320-01-230-0300)
• Medium Wrecker Trucks: M936 (NSN 2320-01-047-8754), M936A1 (NSN 2320-01-206-4078), M936A2 (NSN 2320-01-230-0304)

Chapters Covered

• Chapter 10 – Maintenance Instructions
  • WP 0771: Deepwater Fording Regulator Valve Replacement
  • WP 0772: A-Frame Components Replacement
  • WP 0773: Fire Extinguisher Mounting Bracket Replacement
  • WP 0774: Chemical Agent Alarm Mounting Bracket Replacement
  • WP 0775: Lightweight Weapon Station Modification Component Replacement
  • WP 0776: Decontamination Apparatus and Mounting Bracket Replacement (M13)
  • WP 0777: Mud Guard Kit (M931/A1/A2, M932/A1/A2) Repair
  • WP 0778: Rifle Mounting Components Replacement
  • WP 0779: Hand Airbrake Air Supply Valve Replacement
  • WP 0780: 100-Amp Alternator Replacement
  • WP 0781: Convoy Warning Light Mount Replacement
  • WP 0782: European Mini-Lighting Component Replacement
  • WP 0783: Automatic Throttle Component Replacement (M936/A1)
  • WP 0784: Atmospheric Fuel Tank Vent System Replacement
  • WP 0785: Hydraulic Hose Chafe Guard Component Replacement
  • WP 0786: Hydraulic Reservoir Drain Replacement
  • WP 0787: Hydraulic Reservoir Shutoff Modification Replacement (M936/A1/A2)
  • WP 0788: Van Handrail Component Replacement (M934/A1/A2)
  • WP 0789: Exhaust Heat Shield Accessory Kit Replacement
  • WP 0790: Seatbelt Replacement
  • WP 0791: Hand Airbrake Controller Valve Replacement
  • WP 0792: 100-Amp Alternator Harness Replacement
  • WP 0793: 100-Amp Voltage Regulator Replacement
  • WP 0794: Convoy Warning Light Mount Replacement (M934/A1/A2)
  • WP 0795: Convoy Warning Light Mount Replacement (M929/A1/A2, M930/A1/A2)
  • WP 0796: Convoy Warning Light Harness Replacement
  • WP 0797: Convoy Warning Light Harness Replacement (M929/A1/A2, M930/A1/A2)
  • WP 0798: Convoy Warning Light Harness Replacement (M934/A1/A2)
  • WP 0799: Convoy Warning Light Replacement
  • WP 0800: Convoy Warning Light Switch Replacement
  • WP 0801: Pioneer Tool Kit Mounting Bracket Replacement
  • WP 0802: Hand Airbrake Double Check Valves Replacement
  • WP 0803: Hand Airbrake Tractor Protection Valve Replacement
  • WP 0804: Convoy Warning Light Relay and Leads Replacement
  • WP 0805: Air Lines Fabrication
  • WP 0806: Air Dryer Filter Replacement
  • WP 0807: Air Dryer and Mounting Brackets Replacement
  • WP 0808: Air Dryer Heater Replacement
  • WP 0809: Relief Safety Valve Replacement
  • WP 0810: Pneumatic Controller and Relief Valve Repair
  • WP 0811: Water Separator Replacement
  • WP 0812: Pressure Transducer Replacement
  • WP 0813: Electronic Control Unit (ECU) Replacement
  • WP 0814: Speedometer Driveshaft Maintenance
  • WP 0815: Speedometer and Tachometer Replacement
  • WP 0816: Tachometer Drive Replacement
  • WP 0817: Tachometer Driveshaft Repair
  • WP 0818: Air Gauge Replacement
  • WP 0819: General Maintenance Instructions
  • WP 0820: Lubrication Instructions
  • WP 0821: Torque Limits

  IMAGES PREVIEW

  

  

  

• Chapter 11 – Supporting Information
  • WP 0822: References
  • WP 0823: Introduction for Standard Two-Level MAC
  • WP 0824: Maintenance Allocation Chart (MAC)
  • WP 0825: Expendable/Durable Items List
  • WP 0826: Tool Identification List
  • WP 0827: Mandatory Replacement Parts List
  • WP 0828: Schematics (Foldout Figures FO-1 through FO-14)

Together, these 57 work packages equip shop technicians, fleet mechanics, and military vehicle restorers with step-by-step disassembly, inspection, test, and installation workflows. Every package outlines initial setup conditions, required personnel, authorized tool lists from the general automotive mechanics kit, mandatory replacement hardware, and follow-on verification steps.

Pneumatic Controls, CTIS & Air Brake Infrastructure

A critical focus of this manual centers on tactical compressed air management and tire inflation controls. Work packages systematically cover servicing the Bendix-style air dryer assemblies, desiccant filter replacement, heating elements, and thermostat circuits across standard and wrecker chassis. For the Central Tire Inflation System (CTIS), the manual details maintenance of the electronic control unit (ECU) mounted on the shifter tower, pressure transducers, axle relief safety valves, water separators, and cab floor pneumatic controller assemblies. Technicians receive detailed solenoid wiring continuity check tables and pneumatic valve cartridge servicing steps to ensure rapid field troubleshooting and dependable cross-country mobility.

Special Purpose Kits, Cab Modifications & Electrical Hardware

Volume 5 details specialized equipment configurations not found in standard commercial truck manuals. In-depth work packages guide mechanics through the complete mechanical removal, rebuilding, and installation of the cab-roof lightweight weapon station modification, including bearing ring assemblies, backrests, and traverse lock mechanisms. Furthermore, it details installation and wiring for M13 decontamination apparatus brackets, chemical agent alarm harnesses, deepwater fording regulator valves, field-installed A-frame recovery kits, rifle mounting racks, 100-amp alternator and external solid-state voltage regulator charging harnesses, convoy warning lamp switches, and convoy relays.

Fleet Lubrication Specifications & General Torque Standards

To ensure long-term chassis longevity, WP 0820 presents comprehensive lubrication charts covering fluid capacities, oil grades, and service intervals based on ambient operational temperature ranges from Arctic (-65°F) to desert environments (+80°F and above). Specifications cover engine crankcase capacities (27 qt with filter for M939/A1 Cummins NHC 250; 20 qt with filter for M939A2 Cummins 6CTA8.3), Allison automatic transmission drain and refill capacities (17 qt dry/refill or 19 qt with PTO), transfer cases (6.5 qt), front and rear axle differentials (12 qt each), steering hydraulic reservoirs, dump hoists, and wrecker crane hydraulic systems (100 gal / 378.5 L). In addition, WP 0821 provides dry, wet, and metric fastener torque limit tables alongside assembly instructions for mini-barb, knurl-on, nylon airbrake, and copper tubing connections.

Master Maintenance Allocation Chart & Foldout Diagrams

Chapter 11 incorporates the Two-Level Maintenance Allocation Chart (MAC), establishing exact military labor hour estimates and maintenance authorizations across Crew and Maintainer field tiers as well as Below Depot and Depot sustainment echelons. Concluding Volume 5 is a vital set of 14 foldout engineering schematics (FO-1 through FO-14) providing full electrical diagrams for M939, M939A1, and M939A2 trucks, expansible van bodies, anti-lock brake system (ABS) electrical circuits, ABS air tubing layouts, and CTIS air supply and control plumbing.

Field Capability, Mechanical Precision & Instant Digital Delivery

Working on 5-ton military tactical vehicles demands exact technical compliance to avoid equipment damage and ensure personnel safety. Utilizing the US Army M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual – Volume 5 (TM 9-2320-272-23-5) ensures that every air valve, electrical harness, weapon mount, and pneumatic regulator is installed, aligned, and torqued strictly according to Department of the Army standards. Delivered immediately upon purchase as a downloadable high-resolution PDF, this manual eliminates physical shipping wait times, allowing you to access vital schematics, lubrication charts, and field work packages instantly on your shop computer, tablet, or smartphone, or print crisp physical work sheets for bench-side use.