Case 580SR Service Manual page 288

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222 SECTION 21 - TRANSMISSION
SECOND CLUTCH DRUM ASSEMBLY
Install the piston outer seal.
NOTE: ring must be sized before installing in clutch
drum. Sizing is best accomplished by rotating piston
while holding a round object against the new sealing
ring. Rotate piston until sealing ring is flush with out-
er diameter of the piston.
Install the clutch piston inner seal.
Install the clutch piston in the clutch drum.
Use caution as not to damage the sealing rings.
Install the piston wear plate.
Install the piston return spring.