Service Manual

Engine cranks but will not start.
Possible Cause Corrective Action
Contaminated fuel Clean fuel system
Incorrect starting procedure Activate glow plugs before attempting to start
The fuel tank is empty Fill with fresh fuel
The fuel shut-off valve is closed Open the fuel shut- off valve
Dirt or water is in the fuel system Drain and flush fuel system; add fresh fuel
Clogged fuel line Clean or replace
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Inoperative glow plugs Check fuse, glow plugs, and wiring
Inoperative fuel solenoid Check wiring, start switch, and fuel solenoid
Slow cranking speed Check battery, oil viscosity,and starter motor
Insufficient combustion air supply Check air filter and combustion air path
Low compression Perform cylinder leak down test. Adjust, repair, or
replace affected parts.
Starter does not crank.
Possible Cause Corrective Action
The fuse is blown or loose Correct or replace the fuse
The battery is discharged Charge the battery or replace it
The safety interlock system is malfunctioning Inspect safety switches and wiring harness
A faulty starter, starter solenoid, relay, or ignition switch Replace
Seized internal engine components Replace
Engine starts but does not keep running.
Possible Cause Corrective Action
Contaminated fuel Clean fuel system
Air in fuel Bleed nozzles, check for leaks on suction side of
system
Waxing fuel below 32° F (0° C) Use a winter blend fuel when the ambient temperature
is below freezing
The fuel filter is clogged Replace the fuel filter
Dirt or water in the fuel system Drain fuel filter. Flush fuel system if necessary
The fuel tank vent is restricted Vent system hoses kinked or plugged, clean or replace
Loose wires or poor connectors Check and tighten wire connections
Warning: Diesel fuel under high pressure. Cover fittings before loosening. High pressure fuel can
penetrate skin causing blood poisoning or infection.
TROUBLESHOOTING
5
DIESEL ENGINE
5xi Series Tractor Service Manual 5-3