Case 580SR Service Manual page 125

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SECTION 21 - TRANSMISSION 59
HYDRAULIC DOG CLUTCH 4WD ASSEMBLY
Fit a new O-ring and sealing ring to the shaft.
Fit a new O-ring and sealing ring into the piston.
Bend the sealing ring into a heart shape as shown to
assist assembly.
Lubricate the seals with a light grease and refit the
piston to the shaft.
Replace the piston spring and the clip retainer.