AC 5040 hydraulics

Here recently my AC 5040 has started leaking hydraulic fluid where the right lift arm attaches to the rock shaft when I run an attachment that uses the PTO like a mower. How hard is it to replace the shaft seal on the rockshaft? Does the
whole rock shaft have to be removed? Do I need to pull the whole hydraulic unit off the top of the transmission for this job? I have the service manual but it isn't very clear - to me anyway.
 

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