Hitachi ZW 310-6 Operator's Manual page 300

9. One point each to upper and lower center hinge pins
(14 and 15).
--- every 250 hours
Upper (14)
Lower (15)
10. One point each to front and rear axle support pins
(16 and 17).
--- every 10 hours
Front (17)
Rear (16)
11. One point to second (front) propeller shaft universal
(18).
--- every 12000 hours
f
NOTE: When the machine is continuously operated
under severe conditions for a long time, shorten the
greasing intervals.
MAINTENANCE
7-22
14
15
16
90Z7B-7-23-1
18
90Z7-7-22-2
17
90Z7-7-23-2