M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual Volume 4 – TM 9-2320-272-23-4

Description

M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual Volume 4 – TM 9-2320-272-23-4

This comprehensive technical manual serves as the primary field maintenance authority for the complete family of M939, M939A1, and M939A2 series 5-ton 6×6 diesel tactical vehicles. Designated officially as TM 9-2320-272-23-4 (and Air Force technical order TO 36A12-1C-1155-2-4), Volume 4 is dedicated entirely to Chapter 9 Maintenance Instructions. It provides exhaustive, step-by-step procedural coverage spanning 217 dedicated work packages (WP 0554 through WP 0770), encompassing cab sheet metal, cargo beds, dump bodies, expansible van mechanisms, hydraulic winches, wrecker recovery cranes, power takeoff (PTO) units, personnel and coolant heaters, and deepwater fording systems.

File Details

• Manual Type: Field Maintenance Manual
• Brand / Vehicle Series: AM General / U.S. Army & Air Force M939, M939A1, and M939A2 Series Trucks (Diesel)
• Document Numbers: Army TM 9-2320-272-23-4 / Air Force TO 36A12-1C-1155-2-4
• Publication Date: 10 September 2012
• Supersedure: Supersedes TM 9-2320-272-24-1, TM 9-2320-272-24-2, TM 9-2320-272-24-3, TM 9-2320-272-24-4, and TO 36A12-1C-1155-2-1 through TO 36A12-1C-1155-2-4 (dated 30 June 1998)
• Volume Information: Volume 4 of 5 (Chapter 9: Maintenance Instructions, Work Packages 0554 through 0770)
• Language: English
• Page Count: 1,339 pages
• File Format: PDF (Instant Digital Download)

Complete Vehicle and Variant Coverage

The M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual Volume 4 – TM 9-2320-272-23-4 provides factory-level maintenance procedures across all standard, winch-equipped, and long-wheelbase variants in the 5-ton diesel fleet:

• Cargo Trucks (Dropside): M923 (NSN 2320-01-050-2084), M923A1 (NSN 2320-01-206-4087), M923A2 (NSN 2320-01-230-0307), and winch-equipped models M925 (NSN 2320-01-047-8769), M925A1 (NSN 2320-01-206-4088), M925A2 (NSN 2320-01-230-0308).
• Cargo Trucks (Extra-Long Wheelbase / XLWB): M927 (NSN 2320-01-047-8771), M927A1 (NSN 2320-01-206-4089), M927A2 (NSN 2320-01-230-0309), and winch-equipped models M928 (NSN 2320-01-047-8770), M928A1 (NSN 2320-01-206-4090), M928A2 (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), and winch-equipped models M930 (NSN 2320-01-047-8755), M930A1 (NSN 2320-01-206-4080), M930A2 (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), and winch-equipped models M932 (NSN 2320-01-047-8752), M932A1 (NSN 2320-01-205-2684), M932A2 (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).

Comprehensive Field Maintenance Scope

Every work package in this volume is structured with an Initial Setup block (identifying required tools, common automotive kits, replacement hardware, and equipment conditions), fully sequenced mechanical steps, component callout numbers linked directly to technical drawings, and required follow-on maintenance tasks. Major system disciplines addressed in this M939 field maintenance manual include:

IMAGES PREVIEW

• Cab Body, Hood, Doors, and Mounting: Removal, alignment, and rebuild of cab doors, check rods, hinges, catches, hood latch brackets, and torsion balance bars. Covers the complete replacement of the front trunnion crossmember bracket (with 96 lb-ft / 130 N·m insulator bolt torque), engine hood hoisting and alignment (establishing the required 1/4-inch to 3/4-inch clearance with 100 lb-ft / 136 N·m crossmember torque), radiator brushguard assemblies, in-cab engine access covers, front cab mounts, rear spring-loaded cab mounts, cowl ventilation doors, and cab thermal and acoustic insulation panels.
• Seating Systems: Companion seat frame, backrest, and battery box cover linkages; driver seat suspension base disassembly, torque spring crank adjustment mechanisms, shock absorber replacement, and slide adjuster overhauls.
• Cargo Body and Structural Decking: Complete cargo bed removal and hoisting procedures using dual utility chain rigging; front spring-cushioned holddown brackets (specifying spring compressed length to 6.75 in. ± 0.06 in. / 171.45 mm ± 1.5 mm); fabrication blueprints and counterbore hole specifications for red and white oak laminated frame rail sills (distinguishing standard 14-foot vs. extra-long wheelbase bed dimensions); troop seats, folding side racks, tailgates, and personnel boarding steps.
• Dump Body and Hoist Hydraulics: Dump body subframe hoist cylinders, safety braces, thrust plate pivot pins, tailgate operating crossshaft linkages, cab protector shields, dump hydraulic pump replacement, control valves, and high-torque hinge bracket assemblies (torqued to 240 lb-ft / 325 N·m).
• M934 Expansible Van Body Systems: Complete structural maintenance of expandable side walls, retractable support beams, ratchet drive shafts, drive sprockets, bushings, and locking pawls; side-to-roof toggle clamps and anchor posts; hinged end panel repairs; roof and floor counterbalance cable routing and turnbuckle tensioning; retractable windows, double pane glazing, rubber seals, and crank regulators; bonnet access doors; and exterior blackout panel guides.
• Expansible Van Electrical Infrastructure: Maintenance and wiring replacements for the electrical load center box, 100-amp main, 40-amp, 30-amp, and 20-amp circuit breakers, neutral buss bars, control relays, 220V 3-phase entrance receptacles, 400 Hz frequency converter units and conduit runs, interior fluorescent and blackout light fixtures, door blackout bypass plunger switches, and interior/exterior telephone terminal posts.
• Front and Rear Hydraulic Recovery Winches: Complete replacement and overhaul instructions for front winches and heavy rear recovery winches; automatic load brake servicing; drag brake testing and calibration; level wind drive assembly rebuilds; roller fairleads and tensioners; hydraulic drive motors; hydraulic pumps; directional control valve cables; wire rope cables; and high-pressure hydraulic line routing.
• M936 Medium Wrecker Crane and Turntable: Hydraulic boom assemblies, inner telescoping boom, boom guide rollers, elevating hydraulic cylinder, extension hydraulic cylinder, hydraulic swing motor, swing gearcase teardown, turntable bearing and gear replacement, hydraulic swivel valve distribution block, gondola operator control valves, hoist winch mechanical wear limits table, hoist level winders, and wrecker hydraulic oil reservoirs.
• Power Takeoff (PTO) Assemblies: Disassembly, cleaning, inspection, and rebuilding of the transfer case PTO (including shift levers, clutch collars, bearings, and drive shafts); transmission-mounted PTO units; and remote PTO control linkage cables for M939, M939A1, and M939A2 vehicles.
• Heating, Defrosting, and Arctic Winterization: Personnel hot water heater and ducting; auxiliary fuel-burning personnel heaters (differentiating M939/A1 mechanical pump setups from M939A2 electric pump configurations); fuel supply shutoff valves; engine coolant preheaters; coolant circulating pumps; battery box heater pads; radiator winterization quilted cover kits; cab hardtop kits; and deepwater fording kits including dash control cables, pressurization valves, and vent air lines.

Chapters Covered — Master Work Package Directory

• WP 0554: Window Blackout Panel Replacement
• WP 0555: Cab Door Check Rod Replacement
• WP 0556: Cab Door Hinge Replacement
• WP 0557: Cab Door Catch Replacement
• WP 0558: Hood Latch and Bracket Replacement
• WP 0559: Hood Support Bar Bracket, Crossmember, Hinges, and Torsion Bars Replacement
• WP 0560: Hood Stop Cables Replacement
• WP 0561: Hood Grab Handle Replacement
• WP 0562: Radiator Baffles, Seals, and Plates Replacement
• WP 0563: Cab Hood Stop Bracket Replacement
• WP 0564: Hood Bumper Replacement
• WP 0565: Engine Hood Replacement and Alignment
• WP 0566: Windshield Stop Bracket and Latch Replacement
• WP 0567: Engine Access Cover (In-Cab) Replacement
• WP 0568: Front Cab Mount Replacement
• WP 0569: Rear Cab Mount Replacement
• WP 0570: Cab Grab Handle Replacement
• WP 0571: Vent Door Weather Seal Replacement
• WP 0572: Cab Cowl Vent Screen and Door Replacement
• WP 0573: Front Fenders Replacement
• WP 0574: Front Fender Extension Replacement
• WP 0575: Fender Splash Shield Replacement
• WP 0576: Radiator Brushguard Replacement
• WP 0577: Windshield and Outer Frame Assembly Replacement
• WP 0578: Windshield Frame Assembly Replacement and Disassembly
• WP 0579: Cab Windshield Hinge Assembly Replacement
• WP 0580: Cab Insulation Replacement
• WP 0581: Companion Seat Cushion, Backrest Cushion, and Frame Replacement
• WP 0582: Driver’s Seat, Frame, and Base Replacement
• WP 0583: Driver’s Seat Cushion and Backrest Cushion Replacement
• WP 0584: Map Compartment Replacement
• WP 0585: Van Power Cable Reel Replacement (M934A1/A2)
• WP 0586: Toolbox and Steps Replacement
• WP 0587: Cargo Stowage Box Replacement
• WP 0588: Cargo Body Assembly Repair and Removal
• WP 0589: Cargo Troop Seat Repair
• WP 0590: Cargo Tailgate and Bumper Replacement
• WP 0591: Dump Tailgate Control Linkage Replacement
• WP 0592: Dump Tailgate Assembly Replacement
• WP 0593: Cargo Body Frame Rail Sill Replacement and Oak Sill Fabrication
• WP 0594: Dump Body Repair and Hoisting
• WP 0595: Dump Cab Protector Shield Repair
• WP 0596: Cargo Upper Wheel Splash Guard Replacement
• WP 0597: Side Locking Pin Retaining Clip Replacement
• WP 0598: Tailgate Personnel Step Replacement
• WP 0599: Van Rear Door and Side Door Window Replacement
• WP 0600: Window Brush Guard Replacement
• WP 0601: Rear Door Repair (M934 Expansible Van)
• WP 0602: Van Side Doors Maintenance
• WP 0603: Van Hinged End Panel Repair
• WP 0604: Van Hinged Roof and Floor Counterbalance Cable Replacement
• WP 0605: Van Retractable Window Replacement and Glass Glazing
• WP 0606: Van Window Screen Replacement
• WP 0607: Van Retractable Window Regulator Replacement
• WP 0608: Window Regulator and Inside Door Handle Replacement
• WP 0609: Van Side Panel-to-Roof Toggle Clamp Replacement
• WP 0610: Van Toggle Clamp Anchor Post Replacement
• WP 0611: Van Side Panel Roof Swivel Hook Replacement
• WP 0612: Van Ladder Locking Clamp Replacement
• WP 0613: Van Bonnet Handle and Control Rod Replacement
• WP 0614: Van Door Hinge and Seal Replacement
• WP 0615: Van Panel Seals Replacement
• WP 0616: Van Door Handle and Lock Replacement
• WP 0617: Van Door Checks Replacement
• WP 0618: Van Ladder Rack Bumpers Replacement
• WP 0619: Van Side Panel Rubber Bumpers Replacement
• WP 0620: Van Side Panel Rear Lock Replacement
• WP 0621: Van Side Panel Front Lock and Hinged-Type Roof Lock Replacement
• WP 0622: Van Side Panel Exterior Lock Replacement
• WP 0623: Van Fluorescent Light Tube Replacement
• WP 0624: Van Emergency/Blackout Light Lamp and Lens Replacement
• WP 0625: Van Blackout Light Switch and 110-Volt Receptacle Replacement
• WP 0626: Van Inside Telephone Jack Post Replacement
• WP 0627: Van Outside Telephone Jack Post Replacement
• WP 0628: Van Side and Rear Door Blackout Light Switch Replacement
• WP 0629: Van Hinged Roof-Operated Blackout Circuit Plungers Replacement
• WP 0630: Van Retractable Beam Assembly Replacement and Shaft Overhaul
• WP 0631: Van Heater and Exhaust Replacement
• WP 0632: Van Heater Fuel Pump Replacement (M934, M934A1, M934A2)
• WP 0633: Air Conditioner Drain Tube Replacement
• WP 0634: Heater Fuel Pump Wiring Harness Replacement
• WP 0635: Right and Left Side Blackout Harness Repair
• WP 0636: Circuit Breaker Harness and Circuit Breaker Replacement
• WP 0637: Entrance Receptacle 220V 3-Phase Wiring Harness Replacement
• WP 0638: Flexible Converter Wiring Harness Replacement
• WP 0639: Electrical Load Center Box Replacement and Disassembly
• WP 0640: Electrical Box Replacement
• WP 0641: Electrical Junction Box Replacement
• WP 0642: 400 Hz Converter Harness Conduit Replacement
• WP 0643: Heater Thermostat and 10 kW Heater Thermostat Replacement
• WP 0644: Blackout and Emergency Light Fixtures Replacement
• WP 0645: Air Conditioner Manual Starter Switches Replacement
• WP 0646: Fluorescent Light Fixtures Replacement
• WP 0647: 400 Hz Converter Replacement
• WP 0648: Electrical Load Center Conduit Replacement
• WP 0649: Front Wall Registers Replacement
• WP 0650: Bonnet Access Door Maintenance
• WP 0651: Bonnet Door Maintenance
• WP 0652: Air Conditioner Repair
• WP 0653: Main Wiring Harness Replacement
• WP 0654: Van Air Conditioner Wiring Harness Replacement
• WP 0655: Van Heater Wiring Harness Replacement
• WP 0656: Electric Heater (10 kW) Wiring Harness Replacement
• WP 0657: Blackout Bypass Wiring Harness Repair
• WP 0658: Emergency Lamp Wiring Harness Replacement
• WP 0659: Blackout and Clearance Lights Wiring Harness Replacement
• WP 0660: 400 Hz Supply Wiring Harness Replacement
• WP 0661: Branched 400 Hz Receptacle Wiring Harness Replacement
• WP 0662: Telephone Post Wiring Harness Replacement
• WP 0663: 3-Phase Receptacle Wiring Harness Replacement
• WP 0664: Forward Deck Plate Replacement
• WP 0665: Crane Body Housing Assembly Cover Replacement
• WP 0666: Wrecker Body Replacement
• WP 0667: Fuel Can Bracket Replacement
• WP 0668: Front Winch Replacement
• WP 0669: Rear Winch Cable Tensioner Adjustment
• WP 0670: Rear Winch Replacement
• WP 0671: Winch Frame Extension Replacement
• WP 0672: Front Winch Automatic Brake Adjustment
• WP 0673: Front Winch Drag Brake Adjustment
• WP 0674: Front Winch Cable Chain and Hook Replacement
• WP 0675: Front Winch Cable Clevis Replacement
• WP 0676: Rear Winch Roller Repair
• WP 0677: Front Winch Cable Tensioner Repair
• WP 0678: Front and Rear Winch Level Wind Repair
• WP 0679: Front Winch Roller Assembly Repair
• WP 0680: Front Winch Control Valve Cable Replacement
• WP 0681: Front and Rear Winch Control Valve Replacement
• WP 0682: Rear Winch Hydraulic Motor Replacement
• WP 0683: Front Winch Hydraulic Pump Replacement
• WP 0684: Front Winch Cable Replacement
• WP 0685: Front Winch Hydraulic Hose and Tube Replacement
• WP 0686: Wrecker Crane Boom Replacement
• WP 0687: Inner Boom Replacement
• WP 0688: Boom Roller Repair
• WP 0689: Crane Swivel Valve Repair
• WP 0690: Crane Hydraulic Swing Motor Replacement
• WP 0691: Crane Swing Gearcase Replacement
• WP 0692: Turntable Repair and Bearing Replacement
• WP 0693: Boom Elevating Cylinder Replacement
• WP 0694: Front Winch Motor Replacement
• WP 0695: Boom Extension Cylinder Replacement
• WP 0696: Hoist Winch Replacement, Teardown, and Wear Limits
• WP 0697: Hoist Level Wind Replacement
• WP 0698: Crane Gondola Control Valve Repair
• WP 0699: Gondola Repair and Rigging
• WP 0700: Hydraulic Hoist Winch Motor and Lines Replacement
• WP 0701: Winch Hydraulic Oil Reservoir Replacement
• WP 0702: Tractor Winch Hydraulic Oil Reservoir Replacement (M932, M932A1, M932A2)
• WP 0703: Wrecker Hydraulic Oil Reservoir, Brackets, and Straps Repair
• WP 0704: Winch Hydraulic Oil Reservoir Filter Replacement
• WP 0705: Pressure Relief Valve Testing and Adjustment
• WP 0706: Snubber Valve Assembly Replacement
• WP 0707: Crane Hydraulic Filter and Housing Repair
• WP 0708: Automatic Brake (Hoist Winch) Servicing and Adjustment
• WP 0709: Hoist Winch Cable Replacement
• WP 0710: Rear Winch Cable Replacement
• WP 0711: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0712: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0713: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0714: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0715: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0716: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0717: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0718: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0719: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0720: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0721: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0722: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0723: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0724: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0725: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0726: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0727: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0728: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0729: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0730: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0731: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0732: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0733: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0734: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0735: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0736: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0737: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0738: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0739: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0740: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0741: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0742: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0743: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0744: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0745: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0746: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0747: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0748: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0749: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0750: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0751: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0752: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0753: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0754: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0755: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0756: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0757: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0758: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0759: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0760: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0761: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0762: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0763: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0764: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0765: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0766: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0767: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0768: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0769: Wrecker Crane Hydraulic Hose and Tube Replacement
• WP 0770: Wrecker Crane Hydraulic Hose and Tube Replacement

For tactical vehicle mechanics, fleet managers, and private owners restoring or maintaining military surplus 5-ton trucks, having access to this document provides unmatched practical value. Rather than guessing at structural alignments, hydraulic line connections, or complex winch internal brake tension adjustments, technicians are equipped with official procedures tested and proven by military maintenance units. Every exploded component view illustrates the exact assembly sequence, eliminating guesswork, avoiding damage to delicate seals and hydraulic surfaces, and ensuring that mission-critical recovery and transport assets operate at full readiness and safety specifications.

Why This Technical Manual Is Essential

Owning the M939 M939A1 M939A2 Series 5-Ton 6×6 Trucks Field Maintenance Manual Volume 4 – TM 9-2320-272-23-4 gives you direct workshop capability for jobs that general automotive manuals simply cannot touch. From rebuilding transfer case PTOs and calibrating wrecker crane pressure relief valves to adjusting automatic winch drag brakes and wiring 220-volt van power panels, this manual delivers the precise engineering data, torque limits, and step-by-step disassembly flows required for professional results. Because this document is delivered as an instant digital PDF download, you receive immediate access upon purchase with no shipping delays. Store it conveniently on your tablet, workshop laptop, or smartphone for immediate reference in the bay or in the field, or print clean individual work packages whenever dirty hands hit the wrench.