TM 9-2320-260-20
Section IV. MECHANICAL SYSTEMS TROUBLESHOOTING
NOTE
If malfunction corrective action does not correct malfunction,
notify your supervisor.
a. This section provides information to diagnose and correct malfunctions of the mechanical systems.
Because of its complexity, the mechanical system is divided into the following functional systems:
Engine (page 2-70)
q
q Cold Start System (page 2-73)
q Exhaust System (page 2-73)
q Cooling System (page 2-74)
q Clutch (page 2-75)
q Nonelectrical Gages (page 2-75)
q Transmission (page 2-76)
q Transfer Case (page 2-76)
Propeller Shafts (page 2-77)
0
q Front and Rear Axles (page 2-77)
q Suspension (page 2-78)
q Wheels and Tires (page 2-79)
Steering (page 2-80)
q Frame and Brackets (page 2-81)
q Power Takeoff (page 2-81)
q Winch (page (2-82)
q Medium Wrecker (M816), Tractor Wrecker (M819) (page 2-83)
q Tractor Body (M818) (page 2-84)
q Expansible Van Body (M820, M820A1, M820A2) (page 2-84)
q Power Liftgate (M820A2) (page 2-86)
q Personnel Hot Water Heater Kit (page 2-87)
q Personnel Fuel Burning Heater/Power Plant Heater Kit (page 2-87)
b. Principles of operation showing system operation for each mechanical system can be found in
c. Each malfunction symptom given for an individual component or system is followed by a step(s) that
should be taken to determine cause and corrective action that must be taken to remedy the problem.
d. Before taking any action to correct a possible malfunction, the following rules should be followed:
(1) Question vehicle operator to obtain information that might help determine cause of the problem.
(2) Never overlook the chance that the problem could be of simple origin and can be corrected with
minor adjustment.
(3) Use all senses to observe and locate troubles.
(4) Use test instruments or gages to help determine and isolate problem.
(5) Always isolate system where malfunction occurs and then locate defective component.
(6) Use Principles of Automotive Vehicles, TM 9-8000, when troubleshooting vehicles covered in
this manual.
(7) Always park vehicle on level surface and chock wheels before troubleshooting.
(8) Always wear eyeshields when troubleshooting compressed air systems.
2-66
