TM 5-3825-225-14&PSection IV. UNIT TROUBLESHOOTING PROCEDURES4-5. GENERAL.a.This section contains the troubleshooting procedures assigned to water distributor unit maintenance personnel.b.Possible water distributor malfunctions are listed in the Troubleshooting Symptom Index (see paragraph 4-6).The Troubleshooting Table (Table 4-2) lists the malfunction, the probable cause and the corrective action to be taken.c.Before performing unit troubleshooting, ensure that all applicable operator/crew troubleshooting has beenperformed.d.If any of the following malfunctions cannot be corrected or their cause cannot be found, notify direct supportmaintenance personnel.4-6. TROUBLESHOOTING SYMPTOM INDEX.TroubleshootingProcedurePageEngine Fails to Crank ............................................... .................................................................... ....4-8Engine Cranks But Does Not Start ......................................................... ...................................... ....4-9Engine Does Not Develop Full Power ........................................................................................... ....4-10Exhaust Is Smoky ........................................................................ ................................................ ....4-10Oil Pressure Is Lost ...................................................................... ................................................ ....4-10Engine Overheats ........................................................................ ................................................ ....4-10Water Distributor Pump Will Not Prime .................................................... .................................... ....4-11Pump Stops Pumping Until Engine Is Stopped and Restarted ...................................................... ....4-11Auxiliary Throttle Control Valve Does Not Operate .......................................... ............................. ....4-11Sprinkler Valves Do Not Operate .......................................................... ....................................... ....4-124-2. Unit Troubleshooting.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. ENGINE FAILS TO CRANK.Step 1.Check the battery cables for fraying, chafing, corrosion, or looseness.Replace, clean, or tighten battery cables as necessary (see paragraph 4-20).Step 2.Test the battery for low charge (see paragraph 4-20).Replace the battery as necessary (see paragraph 4-20).Step 3.Test the ignition switch and the starter switch. Turn ignition switch to ON and check the voltage across the switch with a multimeter. It should read 12V. Push the starter switch and check the voltage across it with a multimeter. It should read 1 2V. Check all the ignition wire terminals for damage or looseness.Replace switches as necessary. Replace or tighten wires and terminals as necessary (see paragraph4-21).4-8
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