Dump truck bed lowers too fast slamming onto frame. It’s a single cylinder lift with fluid in cylinder itself no tank. If any load is in the bed you can not lower at all it will almost free fall . I have to dump all material at once
If you raise the bed and release the control, does it stay up or start to sag ?
If it sags, it is a leaking packing
If it stays but you can't control the descent it is a bad spool valve.
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