Why sudden hydraulic pressure drop after excavator heat up?

Question:
my hydraulic excavator SK04 is facing a sudden drop of pressure just after the engine heated up. Initial measured pressure was 4000psi but after half an hour drop to 2000 psi. Main release valves readjusted but no effect. The Arm & Boom drop by itself to the ground even without opration. It occurs about a few hours later. Entire excavator has lost its power after engine heated up.

Answers:

Brake Light Fuse for 1999 mercedes benz C230?

Have you tried cleaning the hydraulic oil filters? Sounds like they're clogged up.

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leaky control valve or leaky pistons. replace o-rings

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