My machines hydraulics start slowing after working for awhile maybe 30-45 mins of steady work. Thing was an only certain functions. Bucket,boom & dipper arm slow. Everything else seems to operate normal. I know there are relief valves in the main bank. I think 2 in each separate bank. My question is how do I know if one of those is bad and will 1 bad affect all those functions? Also my book shows 2 relief valves on the swing motor cross ports. What part could those play in this situation? Machine is a 2018 B48411339 Vin
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