Komatsu PC88MR-10 Shop Manual page 1155

6. Install floating seal (5) to idler (4) and support (2)
by using tool L2.
a Degrease the contact surfaces of the O-ring
and the floating seal.
7. Install the O-ring with support (2) and dowel pin
(1).
8.
PC88MR-10
50 Disassembly and assembly
Undercarriage and frame
50-127