M977 Series HEMTT Direct & General Support Maintenance Manual TM 9-2320-279-34-3

Description

M977 Series HEMTT Direct & General Support Maintenance Manual TM 9-2320-279-34-3

This is the Direct Support and General Support Maintenance Instructions technical manual, TM 9-2320-279-34-3, covering the Oshkosh M977 series 8×8 Heavy Expanded Mobility Tactical Trucks (HEMTT). Issued by Headquarters, Department of the Army in June 1987 and updated through Change 8, this M977 Series HEMTT Direct & General Support Maintenance Manual is the higher-echelon companion to the operator and organizational-level manuals, focused on the crane, hydraulic, and special-equipment systems fitted to specific HEMTT variants.

File Details

• Manual type: Technical Manual — Direct Support and General Support Maintenance Instructions
• Document number: TM 9-2320-279-34-3
• Publisher: Headquarters, Department of the Army
• Original date: June 1987, updated through Change 8 (1 July 2005)
• Language: English
• Page count: 851 pages
• File format: PDF, instant digital download

Models Covered

The M977 Series HEMTT Direct & General Support Maintenance Manual applies to the M977 cargo truck (with and without winch), M983 tractor (with and without crane), M984/M984A1 wrecker-recovery truck, and M985 cargo truck with crane, including their A2 and A2R1 configurations, each identified in the manual by model designation and NSN.

Chapters Covered

• Chapter 17 — M977, M984A1, and M985 Crane Maintenance
  • Section I Introduction
  • Section II Crane, Subframe, and Swing Drive
  • Section III Boom, Mast, and Extensions
  • Section IV Cylinders
  • Section V Hoist
  • Section VI Crane Control Systems
  • Section VII Outriggers
• Chapter 19 — Power Takeoff (PTO) and Hydraulic Pump Maintenance
  • Section I Introduction
  • Section II Power Takeoff (PTO)
  • Section III Hydraulic Pump
• Chapter 20 — Hydraulic System Maintenance
  • Section I Introduction
  • Section II Hydraulic Hand Pump
  • Section III Hydraulic Control Valves
• Chapter 21 — Arctic Heater Kit Maintenance
  • Section I Introduction
  • Section II Arctic Heater Kit
• Chapter 22 — M978 Tanker Maintenance
  • Section I Introduction
  • Section II Service and Inspection
  • Section III Pump, Pump Motor, and Auxiliary Pump
  • Section IV Flow Meter
  • Section V Air Eliminator
  • Section VI Valves
  • Section VII Fuel Service Nozzle
• Chapter 23 — Special Purpose Kit Installation
  • Section I Introduction
  • Section II Arctic Heater Kit
  • Section III Armament Equipment
  • Section IV Radio
  • Section V Chemical, Biological, and Radiological (CBR) Equipment
  • Section VI Cab Equipment
• Appendix A — References
• Appendix B — Illustrated List of Manufactured Items
• Appendix C — Expendable Supplies and Materials List
• Appendix D — Torque Limits

IMAGES PREVIEW

Taken together, this M977 Series HEMTT Direct & General Support Maintenance Manual gives a support-level technician everything needed to work on the truck-mounted crane, the PTO-driven hydraulic pump, the hydraulic control valves, the arctic starting equipment, the M978 tanker’s pumping and fuel-handling components, and the mission kits installed across the M977 family — beyond the scope of driver- or unit-level maintenance.

What This Manual Lets You Do

With the M977 Series HEMTT Direct & General Support Maintenance Manual in hand, a shop can troubleshoot and repair the M983 HIAB crane’s boom, mast, cylinders, hoist, and swing drive; overhaul the PTO and hydraulic pump; service hydraulic control valves and the hand pump; maintain the engine arctic heater kit; work through M978 tanker pump, flow meter, air eliminator, valve, and fuel nozzle service; and install special purpose kits including radio, armament, and CBR equipment mounts. Following the manual’s documented torque values, pressure settings, and procedures helps a technician return these systems to factory specification instead of guessing at settings that affect crane load capacity or fuel-handling safety. This is an instant PDF download — there’s no shipping wait, it opens on any computer, tablet, or phone, and it prints cleanly at the shop for hands-on reference.