What a great write-up, and very useful info for those of us with wagons. My '80 SLS works fine, but the '85 doesn't. I haven't checked a thing, other than adding fluid and replacing the low pressure hose. (yes, sadly in that order)
Now, would the next person that does this rebuild take pictures. Excellent instructions, but a lunkhead such as myself always benefits from pictures.

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John