Kubota U17 Thumb Circuit Bleed

The owner of the hydraulic company that installed the relief valve came to my house (about an hour each way and didn't charge me). He gave me a bunch of excavator operating tips and taught me about the different pressures that occur at different bucket and thumb positions. This was away above my expectations. We discovered the hydraulic pressure in the thumb line is initially fine, but it leaks off pretty fast after

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