Shimano NEXUS SG-C7002-5 Dealer's Manual page 39

Maintenance
Oil maintenance of the internal assembly
WB Maintenance Oil Set
(Y00298010)
1. Fill the container with maintenance oil to a height of 95 mm.
2. Immerse the internal unit in the oil from the left side of the hub until the oil reaches up to ring gear unit 1,
as shown in the figure.
Ring gear unit 1
3. Keep the internal unit immersed in oil for approximately 90 seconds.
4. Remove the internal unit from the oil.
95 mm
39