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I am looking at the hydraulic schematics for the R420/520, specifically the cooling circuit, there is shown a thermo switch (on; 110c). Does this switch open and dump to outside the system when oil temp rises above 110c? It appears this is an open line… This equipment sees “a lot” use loading...

:rolleyes:R420 wheel loader HYD fluid running hot & leaking out of case vent. I picked up part time work doing fleet maintenance (for a nursery wholesaler) on Kubota’s, as well other equipment manufactured by others. I began working on a hydraulic leak defect reported by operator. I crawled...