TROUBLESHOOTING
TESTING AND ADJUSTING
1. ENGINE CRANKSHAFT WILL NOT TURN WHEN START SWITCH IS ON Cause: Battery has Low Output
Correction: Check condition of battery. Charge battery or make replacement as necessary.
Wiring or Switches Have Defect
Make repairs or replacements as necessary.
Problem with Engine Protective System
Make reference to ELECTRIC PROTECTIVE SYSTEM, in Form SENR2984 or Form SENR2985.
Starter Motor Solenoid Has A Defect
Install a new solenoid.
Starter Motor Has a Defect
Make repair or replacement of starter motor.
Oil Pressure Switch For Prelubrication Pump Has A Defect
Make a replacement of defective switch.
Prelubrication Oil Pump Has A Defect
Repair or replace pump components as needed.
Inside Problem Prevents Engine Crankshaft From Turning
If the crankshaft can not be turned after disconnecting the driven equipment, remove the fuel injectors and check for fluid in the cylinders while turning the crankshaft. If fluid in the cylinders is not the problem, the engine must be disassembled to check for other inside problems. Some of these inside problems are bearing seizure, piston seizure, or valves making contact with the pistons. ENGINE WILL NOT START - GOVERNOR TERMINAL SHAFT DOES NOT MOVE FUEL CONTROL LINKAGE
2a.
Cause: Low Oil Level In Governor
Correction: Check gauge and add correct amount of clean oil to WOODWARD UG-8 GOVERNORS. Check for plugged oil supply passages to CATERPILLAR 3161 GOVERNORS.
Too Much Binding In Control Linkage
Engine can start cold, but with hot oil governor does not develop enough pump pressure to move linkage. Check linkage effort and correct.
Speed Control Shaft Setting Too Low (Low Idle Not set Correctly)
Move control shaft toward high idle while cranking engine. Terminal shaft on properly operating governor will move fuel control linkage to the "FUEL ON" position.
Solenoid Stuck In Shut Off Position
On UG8L remove top cover assembly and make sure shut down strap is up. Crank engine to start. Repair or make a replacement of faulty solenoid.
Problem with Engine Protective System
Make reference to ELECTRIC PROTECTIVE SYSTEM, in Form SENR2984 or Form SENR2985.
Solenoid Energized in Shutoff Position During Cranking
Disconnect wiring harness to stop signal. Correct by troubleshooting wiring to solenoid.
Low Oil Pressure In Governor
The governor oil pump relief valve may be stuck open or leaking. Correct by governor disassembly and cleaning. 92
