John Deere CD4039DF008 - Manual (Page 74)

Troubleshooting
DPSG,CD03523,49 –19–10AUG99–5/5
Symptom Problem Solution
Engine overloaded. Reduce load.
Improper valve clearance. See your authorized servicing dealer
or engine distributor.
Injection nozzles dirty. See your authorized servicing dealer
or engine distributor.
Engine out of time. See your authorized servicing dealer
or engine distributor.
Defective turbocharger. See your authorized servicing dealer
or engine distributor.
Low engine temperature. Check thermostat.
55-5
112699
PN=74