Transmission oil overheats
Fill system with correct oil
Clogged transmission/hydraulic oil filter
Replace filter
Internal hydraulic leak
See your John Deere dealer
Dirty or clogged oil cooler
Clean or flush oil cooler
Low transmission oil pressure
Failed pressure relief valve
Check valve, replace if necessary
Transmission stuck in neutral or it is hard to shift any gear
Clean or lubricate the speed shift lever linkages
Interlock cable misadjusted
Adjust interlock cable per technical repair manual
AG, OUO6070,-19-20080123