partsandservice
Senior Member
I am working on a Valmet( now Komastsu) 445exl. This machine has a three pad pump drive. One of the pumps is leaking hydraulic oil into the gear box and over filling it. All hydraulic function on the operate as normal. So I think it is likely just a pump shaft seal, but which one? I was thinking about making a pressure regulated device to force air into the case drain port of eachpump to determine which pump is the leaker. How much pressure ? Without blowing the any good shaft seal out. Thanks