Hydraulic cab tilting systems

摘要

A hydraulic ram system for tilting a vehicle cab which is resiliently mounted on the vehicle frame includes a ram cylinder of which that end in which the ram piston is located when the cab is in the lowered position is of increased bore diameter to render the piston passive in this position, an auxiliary valve being provided in the upper ram line held by a spring-loaded detent in a closed condition and adapted to open when during a lifting operation the piston moves out of the increased bore zone.