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PRELIMINARY TROUBLESHOOTING PROCEDURES
SCRAPER SYSTEM

Scraper, Earth Moving, Motorized, Diesel Engine Driven Model 621B
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TM 5-3805-248-10
TROUBLESHOOTING SYMPTOM INDEX
0011 00
Troubleshooting Procedure Page
Malfunction/Symptom
AIR SYSTEM AND BRAKES
1.
Brake Air Pressure Low Alert Indicator and Buzzer Are On During Operation. . . . . . . . . . . . . . . . . . . 0012 00-1
2.
Parking/Emergency Brake Will Not Engage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-1
3.
Parking/Emergency Brake Will Not Release. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-1
4.
Service Brakes Do Not Operate Correctly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-2
5.
Service Brakes Do Not Release Correctly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-2
COOLING SYSTEM
Coolant Temperature Gage Is in Red Range Normal Indicating Engine Is Overheating.. . . . . . . . . . . . . . . . 0012 00-3
DIFFERENTIAL LOCK CONTROL
1.
Differential Lock Control Will Not Engage When Pedal Is Pressed. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-4
2.
Differential Lock Control Will Not Disengage When Pedal Is Released. . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-5
ELECTRICAL SYSTEM
1.
Backup Alarm Will Not Sound When Machine Is Placed in Reverse. . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-5
2.
Blackout Drive Light Will Not Operate When B.O. DRIVE Function Is Selected. . . . . . . . . . . . . . . . . 0012 00-5
3.
Cutting Edge/Bowl Worklight Inoperative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-6
4.
Directional Turn Signal or Hazard Flasher Control Is Not Working. . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-6
5.
Horn Will Not Sound When Button Is Pressed.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-6
6.
Headlight(s)/Parking Light(s) Do Not Operate When SER DRIVE or PARK Functions are Selected. . 0012 00-6
7.
High Beams Do Not Come On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-7
8.
Stoplights Do Not Operate When Brake Pedal Is Pressed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-7
9.
Tail Lights Do Not Come On. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-7
10. Windshield Wiper Not Working. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-7
11. Defroster Fan Not Working.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-7
12. Low Air Pressure Alarm Not Working . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-8
13. Heater Fan Not Working . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-8
ENGINE
1.
Engine Cranks but Fails to Start (Operating Temperature Above 32F (0C). . . . . . . . . . . . . . . . . . . . . 0012 00-8
2.
Engine Cranks but Fails to Start (Operating Temperature Below 32F (0C). . . . . . . . . . . . . . . . . . . . . 0012 00-9
3.
Engine Does Not Develop Full Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-9
4.
Engine Does Not Idle Properly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-9
5.
Engine Fails to Crank When Start Switch Is Turned to Start. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
6.
Engine Starts but Dies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
7.
Engine Starts but Misfires or Runs Rough After Warmup Period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
8.
Excessive Engine Oil Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
9.
Excessive Exhaust Smoke (at Normal Operating Temperature). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
10. Engine Oil Pressure Gage Is in Red Range.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0012 00-10
0011 00-1


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