TM 9-2350-261-20-1
TROUBLESHOOTING SAMPLE
The following sample takes you through a typical troubleshooting procedure.
Finding the Right Troubleshooting Procedure
A carrier arrives at the shop. The DA form 2404 shows that the engine cranks slowly. Engine cranks slowly is
part of the carrier Engine System. Therefore, you lookup engine cranks slowly listed under Engine System in
Troubleshooting Task Index, Section II, in this chapter.
TM 9-2350-261-20-1
Section II. TROUBLESHOOTING
TASK INDEX
ENGINE SYSTEM
Engine Overheats . . . . . . . . . . . . . . . . . . . . . ...3-10
Engine Overcools . . . . . . . . . . . . . . . . . . . . . . . ...3-14
Engine Does Not Crank . . . . . . . . . . . . . . ...3-15
Engine Cranks Slowly . . . . . . . . . . . . . . . . . ...3-25
Engine Cranks But Will Not Start ...3-30
Engine Cranks But Will Not Start
Below 40° (Air Box Heater Is Used) ..3-34
Engine Runs Rough, Stab, Or Does
Not Put Out Full Power . . . . . . . . . . . . . . ...3-44
Engine Oil Low Pressure Indicator
Fails To Go Off After Engine Starts ..3-50
Engine Does Not Remain At Idle
RPM With Suspension Lockout
System Engaged (M741A1 Only) . . . . ...3-51
Engine Fuel System Schematic . . . . . . ...3-52
Starting System Schematic . . . . . . . . . . . ...3-53
Air Box Heater System Schematic ....3-54
CHARGING SYSTEM
Transmission Oil Hi Temp Indicator
Comes On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-71
No Exterior Lights Operate . . . . . . . . . . ...3-73
Blackout Drive Light Does Not Work .3-75
Service Headlight Do Not Operate . ..3-78
Infrared Headlight(s) Does Not
operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-83
Service And/Or Blackout Stop
Lights Malfunction . . . . . . . . . . . . . . . . . . . . . ...3-89
Blackout Marker Light(a) And/Or
Tail Light(s) Do Not Operate . . . . . . . . ...3-93
Service Tail Light Doss Not Operate .3-98
Trailer Lights Do Not Operate . . . . ...3-100
Horn Does Not Operate . . . . . . . . . . . . ...3-102
Instrument Panel Illumination Lights
Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-107
Dome Light(s) Work Improperly . . . ...3-110
Infrared Periscope Works Improperly 3-112
Radio(s) Does Not Work . . . . . . . . . . . . ...3-116
Charging System Malfunction . . . . . . ...3-55
Dome Lights Malfunction
100 Amp Engine Charging System
(M577A2 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-117
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-65
Right Rear Utility
200 Amp Engine Charging System
Outlet/Admittance Buzzer Works
Schematic
3-66
Improperly (M577A2 Only) . . . . . . . . . ...3-122
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
200 Amp Engine Charging System
Left Rear Utility Outlet/Blower Does
Schematic (M981 Only) . . . . . . . . . . . . . . . ...3-67
Not Work (M577A2 Only) . . . . . . . . . . ...3-125
ELECTRICAL SYSTEM
Master Switch On Indicator Does
Not Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-129
Differential Hi Oil Temp Indicator
Comes On
Fuel Level Indicator Malfunctions . ..3-134
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Beam Indicator Light
Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-140
3-8
3-4
Task
3-68