All the #44 pumps and most all Cat hydraulic tanks I have seen use a non vented cap and rely on an air cushion to dampen hydraulic shock.
There is still sort of a mystery about the HT4 though that (going from memory, can't find my manual) shows a vent line tap on that tank mounted above the engine going somewhere???
okay, OM.... will leave it as is..Started the CAT tonight and put the hydraulics through the motions. No leaks around levers or the cover.. Thanks to you and others including jaker65 for all the good instruction on this task:couch2:
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