XB-10088-P
Fifth Wheel Outer Extension Spring, Air Release and Manual Lock
SAF-Holland

Externally located extension tension element in the fifth-wheel control assembly provides supplementary load to support the outer portion of the release mechanism. The spring cooperates with the inner extension component to maintain consistent engagement and smooth cycling of air release and manual lock features. VMRS 059-001-007 classifies it alongside other extension springs used in kingpin engagement systems, while category 42809 anchors its role in fifth-wheel control hardware. In practical terms, engineers specify spring rate, total length, and end-attachment hooks to match the geometry of the control lever, ensuring reliable actuation under varied temperatures and loads. Regular inspection for corrosion, coil fatigue, and anchor wear is essential to prevent late-life failures in the towing system. When installed correctly, the assembly delivers predictable performance, reduces sticking, and contributes to safer, more efficient hitch operation on long-haul routes and frequent coupling tasks.