Hitachi ZW 180-6 Operator's Manual page 301

13. One point to propeller shaft center support (pillow unit)
(19).
--- every 250 hours
14. One point to second (center) propeller shaft universal
front (20).
--- every 12000 hours
One point to second (center) propeller shaft universal
rear (22).
--- every 12000 hours
MAINTENANCE
22
7-29
19
MNEC-07-007
20
M4GB-07-014
MNEC-07-010