Komatsu PC500LC-10R Shop Manual page 340

COMPONENT PARTS OF SWING SYSTEM
General view and sectional view
a: Position of outer race soft zone
1: Greasing port of swing circle pinion
2: Inner race (quantity of teeth: 84)
3: Ball
SPECIFICATIONS OF SWING CIRCLE
Reduction ratio: -84/13 = -6.462
Grease: G2-LI
Quantity of grease: 33.0 ℓ
10-246
10 STRUCTURE AND FUNCTION
b: Position of inner race soft zone mark (S)
4: Outer race
5: Seal
PC500LC-10R