OMRG25204 oem uncert & tier 1.pdf - John Deere Industrial Engines

TroubleshootingGeneral Troubleshooting InformationTroubleshooting engine problems can be difficult. Anengine wiring diagram is provided in this section tohelp isolate electrical problems on power units usingJohn Deere wiring harness and instrument (gauge)panel.Wiring diagrams are shown for the two types ofinstrument panels offered for these engines.Later in this section is a list of possible engineproblems that may be encountered accompanied bypossible causes and corrections. The illustrateddiagrams and troubleshooting information are of ageneral nature, final design of the overall system foryour engine application may be different. See yourengine distributor or servicing dealer if you are indoubt.A reliable program for troubleshooting engine problemsshould include the following basic diagnostic thoughtprocess:• Know the engine and all related systems.• Study the problem thoroughly.• Relate the symptoms to your knowledge of engineand systems.• Diagnose the problem starting with the easiestthings first.• Double-check before beginning the disassembly.• Determine cause and make a thorough repair.• After making repairs, operate the engine undernormal conditions to verify that the problem andcause was corrected.RG,RG34710,5605–19–07JAN02–1/150-1 110306PN=120