TM 9-2350-256-20CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS2-17 HYDRAULIC TROUBLESHOOTING-ContinuedAPUSYMPTOMSEngine fails to crank whenstarting switch is operated.Do steps A and B.Engine cranks but fails to start.Do steps C and G.Engine hard to start.Do steps D, E, F, H, and J.Engine hard to start in coldweather.Do steps H, I, and J.Engine starts but fails to keeprunning, misfires, or lacks power.Do steps H and K through M.Engine overheating.Do steps M and N.Engine discharges black smoke.Do steps I’ and Q.Engine knocks.Do step A.Engine uses excessive oil anddischarges light blue smokyexhaust.Do step R.ABCDEFGHIRemove APU access cover (see paragraph 9-49).heck for loose electrical connections. Clean andtighten connections if loose.Troubleshoot APU engine starter circuit (seeparagraph 2-19, APU starter circuit fails to operate).Remove APU access cover (see paragraph 9-49).Check vehicle tank and APU engine fuel supply linefor restrictions or damage. Clean fuel line or replaceif necessary (see paragraph 13-5).Remove APU access cover (see paragraph 9-49).Check fuel system for water. Bleed water at filters(see paragraph 13-5).Check for leaking APU fuel lines or fittings. Tightenor replace defective lines or fittings.Check for dirty fuel filters. Replace fuel filterelements (see paragraph 13-5).Remove access cover (see paragraph 9-49).Troubleshoot fuel solenoid circuit (see paragraph2-19, APU starter circuit fails to operate). If fuelsolenoid is defective, notify Direct SupportMaintenance.Remove APU access cover (see paragraph 9-49).Check for dirty air cleaner filter element. Clean orreplace filter element (see paragraph 13-2).Check air preheater and glow plugs for malfunctionby troubleshooting APU starter circuit.2-52Change 1
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business