Patent ID: 7165395

Claim:
A hydraulic circuit for a mobile machine, the mobile machine having a work tool, the hydraulic circuit comprising: at least one hydraulic cylinder having a head end and a rod end; a fluid pressure source; a fluid reservoir; a directional control valve fluidly connected to the head end, the rod end, the fluid pressure source and the fluid reservoir; and a ride control valve having a first ride control valve state and a second ride control valve state, the ride control valve fluidly connected to the head end, the rod end, the directional control valve and the fluid reservoir, the first ride control valve state automatically allowing fluid at the head end to flow toward the fluid reservoir when a fluid at the head end reaches a fluid pressure that is greater than a relief pressure at a first level, the work tool moving from a recorded first position to a second position as the fluid at the head end flows toward the fluid reservoir, the first ride control valve state allowing the ride control valve to automatically stop the fluid at the head end from flowing toward the fluid reservoir when the fluid pressure is less than the relief pressure, the directional control valve automatically allowing fluid from the fluid pressure source to enter the head end and move the work tool from the second position toward the first position when the ride control valve is in the first ride control valve state, the relief pressure being automatically adjusted to a second level, the second level being sufficiently high to move the work tool toward the first position.