Case 580SR Service Manual page 249

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SECTION 21 - TRANSMISSION 183
FORWARD LOW 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 clutch piston inner seal.
Install the clutch piston in clutch drum, use caution
as not to damage the sealing rings.
Install the clutch piston wear plate on the piston.
Install the clutch piston spring retainer.