Posted by Steve@Advance on December 31, 2019 at 04:40:34 from (24.182.105.128):
In Reply to: Komatsu hyraulic thumb posted by JerryCPP(WA) on December 30, 2019 at 19:25:24:
If it's working the way it's plumbed, evidently it has an open center system.
That means when there is no demand for pressure, the oil is free flowing through the valves and back to the tank.
Tapping into the pressure line would not give pressure to the thumb unless there was another valve closed.
You will need to leave it plumbed as it is, taking power to the thumb off the return line, but do get rid of the restrictive 3/8 hose.
You can use the 1000lb relief on the thumb circuit as a dump back to the return down stream of the thumb valve. The relief valve would be ahead the thumb control valve.
This is all depending on it being an open center system. Your manual should have that info.
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