John Deere CD4039DF008 - Manual (Page 76)

Troubleshooting
DPSG,CD03523,50 –19–10AUG99–2/2
Symptom Problem Solution
Starter cranks slowly Low battery output. See your authorized servicing dealer
or engine distributor.
Crankcase oil too heavy. Use proper viscosity oil.
Loose or corroded connections. Clean and tighten loose connections.
Entire electrical system Faulty battery connection. Clean and tighten connections.
Sulfated or worn-out battery. See your authorized servicing dealer
or engine distributor.
Blown fuse. Replace fuse.
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PN=76