TM 5-3805-293-23-1
0011
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
19. Low Power/Poor or No
Low Pressure Fuel Lines
Response to Throttle -
Restricted/Damaged - Replace low
Continued
pressure fuel line (WP 0173).
Separator Damaged or
Contaminated - Replace primary fuel
filter and water separator (WP 0174).
Contaminated - Replace secondary
fuel filter (WP 0073).
Lines Loose or Not Secured -
4. Verify that the low pressure fuel
Tighten lines and secure as needed
lines are tight and secured
(WP 0173).
properly (WP 0173).
5. Check for air in fuel system Air in
Air Found in Fuel - Repair or replace
Fuel Test (WP 0035).
components as identified during air in
fuel test (WP 0035).
Air Inlet System is Blocked or Dirty
6. Inspect air inlet system for
- Clean and remove blockage from air
damage, blockage, and
inlet system components (WP 0037).
cleanliness (WP 0037).
Air Inlet System Components are
Damaged - Replace damaged
components (WP 0115, WP 0078, and
WP 0103).
7. Inspect exhaust system for
Remove blockage (WP 0037).
damage and blockage (WP
0037).
Damaged - Replace damaged
components (WP 0077, WP 0076,
WP 0063, and WP 0079).
8. Inspect turbocharger (WP 0037).
Turbocharger Faulty - Replace
turbocharger (WP 0077).
Turbocharger Components
Damaged or Restricted - Replace
turbocharger components (WP 0077)
or clear restriction (WP 0037).
Out of Adjustment - Adjust engine
9. Check the valve lash. Refer to
valve lash (WP 0032).
Systems Operation, Testing and
Adjusting, Engine Valve Lash
Adjustment (WP 0032).
10. Perform Engine Cylinder Cutout
Diagnostic Code Active During
Test (WP 0035).
troubleshooting.
0011-19
Change 1