Different chassis (Spartan Mountain Master w/rear rad), but I was able to removed/reinstalled the alternator myself in a couple of hours. Although I have good access from above, I didn't need it (except to loosen the serpentine belt tensioner) and did all the work from below. It wasn't all that difficult, but may be different with the Freighliner chassis.
The alternator was most likely installed by the chassis manufacturer and not CAT so I do not know what you have, but mine has a Leece-Neville Model LBP2180 and the output voltage is adjustable. There is a small hole on the back near the cable terminals where you can change the output voltage using a small flat blade screwdriver. The only reservation I would have is that your output is fluctuating slightly (14.6-15.3 VDC) where mine is rock steady at 14.1 VDC. If you do remove it, I would also recommend you have it rebuilt by a good motor/alternator rewind shop rather than replacing it. A good shop will use better quality bearings, higher rated bridge diodes and regulator. They will also improved the conformal coating on the windings and it will probably be less expensive. Good luck.
Lou
05 Travel Supreme Envoy
CAT C7
