Doosan DX60R Shop Manual page 177

Disassembly
1. Remove track.
2. Loosen nut (M24) and remove upper roller from track
frame.
3. Remove pin and collar.
4. Use a screwdriver (-) to take out O-ring (6).
NOTE: Once removed, oil seal should not be reused.
5. Remove floating seal (5) and bushing (4) then shaft (2)
from body.
Reassembly
1. Clean separated parts with cleaning fluid.
2. Inject clean gear oil or engine oil (100.0 cc (3.38 oz))
before assembling O-ring (6).
3. See "Track Installation" on page -20. to assemble tracks.
Track Assembly SP001625
Page 31