TM 10-4520-259-13&P
Table 4-2. Unit Troubleshooting Procedure
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5.
Inspect burner nozzle for defects.
Replace burner nozzle if necessary.
Step 6.
Inspect fuel pressure gage for defects.
Replace fuel pressure gage if necessary.
6.
FUEL PUMP LEAKS
Step 1.
Check to see if strainer cover is loose.
Tighten all cover screws as necessary.
Step 2.
Check to see if plugs are loose.
Tighten plugs as necessary.
Step 3.
Inspect shaft seals for leaks.
Replace fuel pump if necessary.
Step 4.
Inspect fuel pump housing for cracks.
Replace fuel pump if necessary.
7.
FUEL PUMP FAILS TO DELIVER FUEL TO BURNER
Step 1.
Check for reversed pump rotation.
Interchange any two of the three 208 volt 3-phase electrical supply lines at the power
source.
Step 2.
Inspect fuel nozzle for clogs.
Clean fuel nozzle. Replace if necessary.
Step 3.
Check to see if fuel pump drive coupling is loose.
Tighten fuel pump drive coupling.
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