Re: B 50 Yanmar..HELP!

Posted by Fawteen on February 05, 2004 at 02:16:56 from (216.204.104.49):

In Reply to: B 50 Yanmar..HELP! posted by Truck on February 04, 2004 at 20:16:00:

I don't have any experience with Yanmar excavators, but do maintain a Takeuchi TD25 which uses a Yanmar engine. I'd expect the overall layout is similar enough to make some assumptions.

Ours uses 2 hydraulic pumps hooked directly to the crankshaft of the engine. The output of the pumps goes to the plumbing under the cab, with various valves to direct the pressure to the various functions. I don't know off the top of my head how the flow from the two pumps is divvied up, but it shouldn't be hard to figure by tracing the plumbing.

My first suspicion would be that one of the pumps has failed, and you've lost power to the tracks.

My second guess would be that a pressure relief valve has stuck open.

Figure out exactly which functions don't work, trace the plumbing back (for instance from the boom cylinder to the associated valve) and figure out which pump or pressure relief serves that function, and go from there.

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