Here the greasing scheme I applied on my former 4/4 (1991):
-sliding axles (imperative and very important if you want to obtain a high mileage on your king pins): every 2500 kms (pump grease till the old grease is being pressed out and carefully wipe the whole area free of old and new grease)
-steering joints: every 2500 kms (carefully do not overfill and harm the rubber protective sealing)
-damper blades( the horizontal steel blades between the sliding axle and the chassis): every 2500 kms clean and apply grease where they enter the chassis above and under
-one shot oiling system (plunger inside above the pedal assembly): I used it the first 10000 kms, then never used it since; this oiling system is abandoned by the factory
-pedal axle: every 10000-15000 kms
-cardan axle: every 10000-15000 kms
-rear axle: every 20000-25000 kms (hypoid oil!)
-engine oil (15W40) and filter (Ford CVH): every 5000 kms
-gearbox: no oil change (did 86000 kms in total)
-handbrake assembly mounted on the rear axle and drum brakes: once a year cleaning and greasing
-wire wheels: once a year removal and thorough cleaning, greasing the splines

The rest of the DIY service: plugs and air filter (20000kms); service-free electronic ignition.
Keep the engine bay and the whole front suspension clean; it's nicer to look at and easier to work on.