ZF Repair Manual: ZF63IV, ZF80IV, ZF80-1IV
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Repair Manual and Spare Parts List
Section 9: Troubleshooting
Symptom
Possibly cause
Remedy
23. Transmission is dragging in
neutral
23.1 Warped discs due to overheating
23.2 Needle bearings on input shaft are
faulty
23.3 Intermediate gear moved from the
shaft and touching the clutch drum
23.4 Discs of the reverse clutch radially
broken due to torsional vibration
23.1 Replace discs, replace any other
faulty parts
23.2 Disassemble transmission, replace
needle bearings
23.3 Replace the intermediate gear
23.4 Replace the discs and change the
damper with a proper one
24. Water in the oil
24.1 Fluid cooler faulty
24.2 Water in bilge
24.1 Repair leakage at cooler or replace
cooler
24.2 Remove water from the bilge and
check the oil seal