Hi there,
I my opinion you won't be able to put it back together again successfully. I also took mine apart, but I waited until after I had installed the digital servo from Unwired Tools. Mine was totally corroded in the gearing, and completely shot. The servo is NOT a simple unit. It was originally designed by Chrysler Corp for their 1970 or so Chryslers, and although it performed adequately in it's original iteration, the Mercedes version was plagued by problems, both vacuum and mechanical.
Do yourself a huge favor - click on "ShopForum up above, then SLforum, then click on the Unwired Tools ad and read up on their digital servo upgrade. They have simplified vacuum diagrams on their website which can be very helpful when troubleshooting vacuum problems. I installed my digital upgrade electronics box inside the cabin in front of the glove box, and the heater valve outside under the hood. It works flawlessly, and provides much better control of the temperatures than the original unit ever could.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C