Prev Next Hendrickson — HN Description This walking beam suspension features bar pin end bushings with no center bushings for the beams to pivot on. The traditional center bushing is replaced by 2 large bolster springs (4 per vehicle.). Hendrickson HN Fast Facts Hendrickson — HN Type Walking beam suspension with bar pin end bushings. Features Problem Areas No center bushings for the beams to pivot on. The transverse rod is critical, especially in high center of gravity applications like dump trucks, and concrete mixers. ATRO Solutions Tech Tips and Additional Resources The proper number of shims for the auxiliary spring can vary according to application and unladen tandem weight. Refer to ATRO Technical Bulletin TB001-012418. Wear Items The transverse rod is critical, especially in high center of gravity applications like dump trucks, concrete mixers. Check periodically for wear. Check bolsters for cracks/debonds Replace if material is cut 1" length or 3/8" in depth Replace if bond separation is >1/2" deep Auxiliary spring should be replaced if the spring itself measures less than 3 1/2" in height when the truck is unloaded. Failure Analysis: Location Possible Primary Failure Point Debond at top plate Check torque rods for bushing failure Debond at lower plate Check bar pin end bushing for failure Key Parts Bar Pin Bushing Kit EB50-21013 All Products Bolster Spring Kit LP50-24000 All Products Auxillary Load Spring Kit LP50-24974 All Products Torque Rod Bushing TS38000 All Products Tapered Torque Rod Bushing TT38000 All Products Two-Piece Torque Rod TR71000 Female TR75000 Male TR76000 Male All Products Details Hendrickson HN Auxillary load spring, LP50-2400 Bolster Spring, "V" bracket, equalizing beam. Prev Next