Maintenance of the M939 Series Vehicles

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Maintenance of the M939 Series Vehicles

Maintenance of the M939 Series Vehicles
Notice to the Students
General
Table of Contents
Lesson1: Characteristics, Operation, And Maintenance Problems Common to the M939 5 TonTruck
Description and data
Figure 1. Cargo Trucks With Dropsides
Cargo Trucks
Purpose of the Vehicles
Figure 3. Cargo Trucks With Extra Long Wheel Bases
Figure 4. Dump Trucks
Tractor Trucks
Figure 5: Tractor Trucks.
Medium Wrecker
Expansible Vans
Figure 7. Expansible Vans
Technical Principles of Operation
Compressed Air and Brake System Operation
Figure 8: Compressed Air And Brake System Components.
Lighting System Operation
Figurer 9. Lighting System Components
Figure 10. Front Winch Hydraulic Systems Components
General Operating Instructions
Figure 11. M939 Series- Chasis Controls And Indicators
Body Equipment Controls And Indicators - Medium Wrecker
Figure 12. Medium Wrecker- Controls And Indicators
Figure 13. Medium Wrecker - Controls And Indicators Cont.
Equivalent Controls - Boom.
Equivalent Controls - Boom. - Continued
Figure 16. Medium Wrecker- Controls and Indicators Cont.
Special Kits Controls and Indicators
Special Kits Controls And Indicators Radiator and Hood Cover Kit.
Figure 19. Hardtop Kit: Radiator And Hood Cover KIt
Lesson 1: Characteristics, Operation. and Maintenance Problems Common to the M939 5 Tion Truck
Troubleshooting Approach
Table 1. Example : Trouble Shooting Symptom Index
General Troubleshooting Rules
Engine System Troubleshooting
Engine System Troubleshooting - Continued
Ether Start System Troubleshooting
Ether Start System Troubleshooting - Continued
Exhaust System Troubleshooting.
Cooling System Troubleshooting
Transmission System Troubleshooting
Power Takeoff Systems Troubleshooting.
Dump Body System Troubleshooting
Electrical Systems Troubleshooting
Battery System Troubleshooting
Starting System Troubleshooting
Starting System Troubleshooting - Continued
Starting System Troubleshooting - Continued
Figure 20. Battery Cable Installtion Sequence
Test Procedures
Charging System Troubleshooting
Figure 21. Multimeter Connection to Alternator Circuit 568
Lighting System Troubleshooting.
Lighting System Troubleshooting. - Continued
Directional Signal System Troubleshooting
Figure 23. Multimeter Connection to Terminal Point G.
Ether Start System Troubleshooting
Figure 25. Meter Connection to Circuit 570 of the Ether Valve
Indicator, Gage, and Wiring System Troubleshooting
Figure 26. Test Procedures for Pressure Switches A and B
Trailer Connection System Troubleshooting
Figure 27. Testing Trailer Receptacle Voltage
Heater System Troubleshooting
Figure 29. Testing the Heater Circuit
Conclusion
Practical Exercise 1
Practical Exercise 1 - Continued
Lesson 1. Practical Exercise - Answers
Lesson 1. Practical Exercise - Answers - Continued
References
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Maintenance of the M939 Series Vehicles

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