TM 9-2320-289-20Table 2-3. Mechanical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONWARNINGDiesel fuel is flammable, When disconnecting fuel lines to test fuel flow,direct fuel spray away from source of ignition. A fire extinguisher must beon hand in work area. Failure to follow this warning may result in seriousinjury or death to personnel.Step 2.Disconnect fuel line from inlet side of heater. Place a suitable container under inletline. Check for fuel flow to heater while holding cm-off switch in “ON” position.If fuel flow is evident, replace heater. (See paragraph 11-16)If fuel flow is not evident, perform step 3.Step 3.Check for restrictions in heater inlet fuel line.If line is restricted, clear restrictions.PROPELLER SHAFT41. MAKES “KLUNKING” SOUND WHEN SHIFTINGStep 1.Inspect propeller shaft universal joints for play. Attempt to move propeller shaftforward and back to detect play on yoke.Replace if thereStep 2.If “klunking” persists,42. VIBRATESStep 1.Check propeller shaftTighten if loose.is play. (See paragraphnotify your supervisor.6-3 or 6-5)mounting bolts for looseness.(See paragraphs 6-2 and 6-4)Step 2.Inspect propeller shaft for damage, buildup of foreign material, and missing weights.Remove foreign material or replace propeller shaft if damaged or weights aremissing. (See paragraphs 6-2, 6-3, 6-4, and 6-5)Step 3.Inspect propeller shaft universal joints for play and binding. Attempt to movepropeller shaft ends forward and back to detect play or binding on yoke.Replace universal joint if there is play or binding. (See paragraphs 6-3 and 6-5) Change 22-51
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