TM-9-2320-279-20-1
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3
TM-9-2320-279-20-1 - Page 134 of 985
TM 9-2320-279-20-1
Section IV. TROUBLESHOOTING
2-14. TROUBLESHOOTING INTRODUCTION.
This section contains step by step procedures for
identifying, locating, isolating, and repairing equipment malfunctions.
2-15. TROUBLESHOOTING INSTRUCTIONS.
The System Symptom Index (Table 2-7) lists common
malfunctions by vehicle system. The Troubleshooting Subject Index (Table 2-8) lists common malfunctions
alphabetically. The Troubleshooting Procedures (Table 2-9) lists each malfunction followed by tests,
inspections, and corrective actions. The Simplified Test Equipment for Internal Combustion Engines
(STE/ICE) (para 2-16) contains procedures for operating the STE/ICE system to check out, test, and
troubleshoot M977 series vehicle’s internal combustion engines and associated fuel and electrical systems,
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective
actions. If a malfunction is not listed or is not corrected by listed corrective actions, notify the supervisor.
Before using troubleshooting tables, be sure all applicable Preventive Maintenance Checks and Services
(PMCS) have been performed. Perform tests, inspections, and corrective actions in the order listed. Try to
return the vehicle or component to operation after each test, inspection, and corrective action has been
performed.
Refer to the figures, foldouts, and publications listed below while doing troubleshooting. These figures,
foldouts, and additional publications will help isolate and locate troubles and get the vehicle back in
service as quickly as possible. Foldouts are found at the end of this volume.
Figure 2-2
Circuit Breakers
Figure 2-3 M986E1 HIGH IDLE Wiring Diagram
Figure 2-4 M984 HIGH IDLE Wiring Diagram
Figure 2-5 M984 HIGH IDLE Control Assembly
Figure 2-6 M985E1 HIGH IDLE Control Assembly
Figure 2-7 Winch Controller Wiring Diagram
Figure 2-8 Winch Controller Wiring Diagram
Figure 2-9 Remote Controller Electrical Schematic (M977, M985)
Figure 2-10 Remote Controller Wiring Diagram (M977, M985)
Figure 2-11 Tanker Component Identification
Figure 2-12 Tanker Fuel System Functional Diagram
Figure 2-13 Tanker Operation Functional Diagram
Figure 2-14 Tanker Fuel System Schematic
Figure 2-15 Wiring Diagram-Engine Heater Model CP3050A (24 Volt)
Figure 2-16 Wiring Diagram-Personnel Heater Model AP3050-24FB
Figure 2-17 STE/ICE Vehicle Test
Figure 2-18 Relationship of GO, NO-GO Tests
Figure 2-19 STE/ICE System
Figure 2-20 VTM Controls and Readout Display
Figure 2-21 Cable Assemblies
Figure 2-22 Connector Key Location
Figure 2-23 Transducer Kit
Foldout 1 Electric Diagram
Foldout 2 Air Schematic
Foldout 3 Hydraulic Schematic
TM 9-2320-279-10, Operator’s Manual for M977 Series Vehicles
LO 9-2320-279-12, Lubrication Order for M977 Series Vehicles
FM 10-71, Petroleum Tank Vehicle Operations
TM 9-6140-200-14, Operator’s, Organizational, Direct Support, and General Support Maintenance Manual
for Lead-Acid Storage Batteries
TM 750-254, Cooling Systems: Tactical Vehicles
TM 9-214, Inspection, Care and Maintenance of Antifriction Bearings
FM 55-506-1, Basic Electricity
DA Pamphlet 750-33, Charging System Troubleshooting
2-5 0
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