HYDRAULIC CONTROLS AND ISOLATION VALVES (CONT)
Before operating any suspension isolation valves, lower the front and rear support
legs and support the platform or injury to personnel may result.
SUSPENSION ISOLATION VALVE (8). There are 10 suspension isolation valve assemblies on the semitrailer, one for
each bogie unit. The suspension isolation valve is used to isolate a suspension cylinder of an affected bogie from the
hydraulic system. Normal position for this valve is OPEN with the valve handle facing forward toward the front of the
semitrailer. The isolation valve handle extension bar, located at rear of semitrailer below the loading ramps, should be
used to open or close each suspension isolation valve. To isolate a bogie, find the appropriate isolation valve and insert
the hook end of the isolation valve handle extension onto the isolation valve handle and pull the valve handle outward to
the CLOSED position. To unisolate a bogie, place the hook end of the extension handle behind the CLOSED valve
handle and push the valve handle forward, toward the front of the semitrailer, to the OPEN position.
2-10 Change 1