Case 580SR Service Manual page 277

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SECTION 21 - TRANSMISSION 211
FIRST CLUTCH ASSEMBLY
Install the clutch 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 piston inner seal. Install the clutch piston
in the clutch drum. Use caution as not to damage the
sealing rings.
Install the clutch piston wear sleeve.
Install the piston return disc springs. First spring with
large diameter of bevel toward wear sleeve.
Alternate eleven (11) springs.