Hitachi ZW 310-6 Operator's Manual page 302

15. Two points to third (rear) propeller shaft universal
(23).
--- every 12000 hours
16. One point to third (rear) propeller shaft splines (24).
--- every 2000 hours
17. Two points to first (main) propeller shaft universal
(25).
--- every 12000 hours
f
NOTE: When the machine is continuously operated
under severe conditions for a long time, shorten the
greasing intervals.
MAINTENANCE
7-24
90Z7-7-24-4
90Z7B-7-24-4