Case 580SR Service Manual page 256

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190 SECTION 21 - TRANSMISSION
Install the piston return spring retainer.
Install the spring retainer spacer.
Install the clutch spring retainer snap ring.
Use a sleeve with the proper diameter to fit over
shaft and against retainer ring. A sharp blow with a
soft hammer will compress the spring and seat re-
tainer ring.
Be sure ring is in full position in the groove.