You did say what your problem is?
There is a free download of Sheppard M- Series power steering services manual.
It is complete manual showing Pitman arm removal.
There is a tech phone number of 717-633-4111 before you begin repairs.
I called them recently and they told me seal kit number, which an easy fix.
If you need parts should be able to go to Kenworth or Mack.
If you do not know the weight, maybe you could use a floor jack.
Also might be a good idea to have caps or plugs for the hydraulic lines to stop fluid from draining out.
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