Hitachi ZW 370-6 Operator's Manual page 317

18. One point each to front and rear axle seal (24).
--- every 1000 hours
 Remove breather nipple (25).
 Fill grease until it spills out of breather nipple (25) hole.
 Wipe the spilled grease and install breather nipple (25).
MAINTENANCE
7-23
25
24
95Z7B-7-22-2
25
24
95Z7B-7-24-2