Hitachi ZW 310-6 Operator's Manual page 301

12. One point to propeller shaft pillow unit (19).
--- every 250 hours
13. One point to second (center) propeller shaft universal
front side (20).
--- every 12000 hours
One point to second (center) propeller shaft universal
rear side (22).
--- every 12000 hours
14. One point to second (center) propeller shaft splines
(21).
--- every 2000 hours
f
NOTE: When greasing spline (21), steer the machine
fully to the right or left, and stop the engine. Lubricate the
fitting, start the engine and slowly turn the machine from
side to side 2 or 3 times after greasing to lubricate the
spline enough.
IMPORTANT: When greased with the machine
positioned in straight, remove the fitting on the
sleeve yoke before starting the engine.
MAINTENANCE
7-23
90Z7-7-24-1
90Z7-7-24-2
90Z7-7-24-3