Use TDTO in the transmission.
I don't know the answer to your question about the hydraulic system but that answer and more can be found in the operator's guide for your 977L.
I found this one on eBay:
https://www.ebay.com/itm/235060818513
Thank you! I ordered a guide last nightÂ
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
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