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Loader Crane no pressure

Good afternoon. I am fitting a Hiab 115 crane to a truck and am not getting any pressure. Pump is good and solenoid dump valve is permanently closed. No leaks observed. Crane is in good condition but has been standing some time. Valve block is Olsbergs type 91 (3957021)

Out riggers, fed direct from block, move very very slowly down and will now not return.

Can somebody please advise what may be the problem