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Chasing a hydraulic leak on STC48A (see other thread) and did some more investigation and diagnosis after reoccurring hyd. leak after replacing the seals at the cap and charge pump. It appears that the bypass/dump valve is the culprit. I removed both left and right ones and inspected and the...

I have replaced the hydraulic pump housing o-ring and charge pump o-ring on both pumps on my mower. I read a lot about hydro-gear “air-purge procedure” at various places while studying up on this job. The procedure references bypass valve, but I’m not sure my pumps are equipped with them. My...

Putting a new oring/seal under the cap on my hydraulic pumps on STC-48A. I was disconnecting the hoses and could not get the small 3/8” line pulled off this fitting without cutting/slicing the hose. Is that the intent of this type of fitting and cutting and replacing the hoses is expected when...

(Sorry for the orientation, can’t figure out how to rotate it) Looks like the cap seam is leaking and a new seal would fix it. However, I have read elsewhere that in some cases a new cap was required to stop the leak. Further, whether I replace just the seal or the cap, can it be done with the...