TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. Engine Misfires, Runs
6. Use ET to perform the Cylinder
Fault Found - Remove unit injector
Rough, or is Unstable -
Cut-Out Test (WP 0035).
from suspect cylinder and replace
Continued
with a new injector (WP 0075).
7. Perform Compression Test
Compression Test Fails - Replace
(WP 0032).
engine (WP 0069).
10. Engine Vibration
1. Inspect vibration damper for dam- Vibration Damper Damaged -
age (WP 0032).
Replace damaged vibration damper
(WP 0083).
2. Inspect vibration damper
Mounting Hardware Loose or
mounting hardware for loose or
Missing - Replace loose or missing
missing components (WP 0083).
components (WP 0083).
3. Inspect engine mounts for
damage, cracks, missing/loose
engine mounts (WP 0068).
hardware, and wear.
Problems Found - Tighten loose
hardware and replace missing
hardware (WP 0068).
4. Check the alignment and the bal-
Misaligned/Not Balanced - Align and
ance of any driven equipment.
replace equipment as required (WP
0032).
11. Engine Will Not Crank
Active Event or Diagnostic Fault
Engine ECM C6.6 120M and
Code - Troubleshoot fault codes (WP
check for any active event or
diagnostic fault codes.
2. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
3. Rotate engine manually (WP
Engine will Not Rotate - Engine
0032), check crankshaft rotates
seized, replace engine (WP 0069).
freely.
4. Ensure all electrical components
Electrical Components Left in the
are turned off (TM 5-3805-293-
ON Position - Turn electrical
10).
components OFF (TM 5-3805-293-
10).
5. Perform Battery Test (WP 0040).
Battery Fails Battery Test - Replace
defective battery (WP 0194).
6. Perform Ignition System Tests
Ignition System Fault - Replace
(WP 0039).
components as required.
7. Check the battery cables to the
Battery Cables Faulty - Replace
battery cables (WP 0195).
Faulty - Replace starter (WP 0099).
Change 1