meanjean, I am sorry but there is no known owner's manual for the L1801 in either hard copy or PDF. The closest North American manual for this model tractor is the owner's manual is the L185. I personally always serviced my old L1801 changing the oil and diesel filters every 100 hours or once a year which ever was first. Servicing the gearbox I did it once every 2 years and cleaning the transmission screen and I greased my L1801 every ten hours as grease is cheap but buying new tie rod ends is expensive. If you have the four wheel drive model I would also keep the front axle service every two years also if it is a 2 wheel drive model as I had I repacked the front hubs every year.