Damn.....damn, where is Hugh when we need him! We just lost our best Super A-140 expert....I promise he would have had your answer.
Check your hydraulic pump and seeing if it is working properly, would be the first thing I"d suspect. If it"s dying...replace it.
If the pump is fine, your hydraulic unit needs to come off again. When you overhauled it....perhaps you missed something...what, I won"t venture to say....but something is amiss. I cannot conceive the overhaul kit not having the correct O rings.....but I can conceive the rebuilder not installing them correctly. I am not slamming you....but you have got to pay close attention when rebuilding one of these units. They are actually quite simple......but you do have to pay close attention in reassembling the parts. And most of all, CLEANLINESS is next to GODLINESS!!!! Absolutely, positively keep everything spotlessly clean and allow no crud to enter the system.....even a speck can plug a passage or score a spool bore.
Look the internals over before reassembly....if you find scoring on the pistons or in the spool bores.....no rebuild kit made is going to fix that and if the bores are scored....fluid bypasses the pistons and results in poor lifting capabilities.
The rebuild kit mainly fixes leaks with new gaskets, and the O rings on the spool pistons generally restores the lifting power.
If your unit is not on the fritz internally, then the only other problems could be a plugged up screen in the reservoir....but if you"ve had the unit apart and put in fresh fluid....that really shouldn"t be the culprit.
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