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
Engine Mounts Damaged - Replace
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
1. Connect MSD (WP 0006). Select
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
starter motor and solenoid.
battery cables (WP 0195).
Starter Solenoid or Starter Motor
Faulty - Replace starter (WP 0099).
Change 1