Cat 938g no bucket tilt/curl in cold weather

hoping someone can help me out. Have a 938g cat loader that when temps get cold (16 deg or less), I lose the ability to curl/tilt the bucket. Boom up/down works fine. Just replaced hydraulic fluid and hydraulic filter hoping it would help....no luck. Once temps get in the upper 20s, everything works fine. I am lost, please help.

Like I said it seems that the cold is the contributing factor here. I’ve tried warming up the machine, cycling thru the functions that do work.....nothing seems to...

Cat 938g no bucket tilt/curl in cold weather

Cat 938g no bucket tilt/curl in cold weather