Case 580SR Service Manual page 503

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SECTION 27 - REAR AXLE 11
The differential lock can be disassembled by com-
pressing the spring and carefully detaching the snap
ring (1).
With the snap ring removed disassemble the: wash-
er (2), outer dog (3), spring (4), inner dog (5) from
the housing (6).
Carefully inspect all moving parts for signs of scor-
ing, wear, or damage, if evident replace with new
parts.
By means of an extractor remove the bearing (16).
Loosen and remove the screws (17). Disassemble
the half-housing of differential (15).
Now it is possible to remove the thrust washers (10)
and (14), the gears (11) and (13) and the spider
gears (12).