John Deere RE184034 Belt Tensioner Assembly

Technical specification for John Deere RE184034 automatic belt tensioner assembly. Designed for V-ribbed serpentine belt systems on PowerTech diesel engines. Features cast aluminum housing with integrated pulley and torsion spring mechanism. Maintains consistent belt tension across engine speed and load variations. Direct replacement for OEM RE184034 and AH155348. Compatible with John Deere 8120, 8220, 8320, 8420, 8520 tractors and 777, 797 mowers. Also fits 9000 series combines and W/T series harvesters. Material composition includes aluminum tensioner arm, steel pulley with sealed bearing, and calibrated flat-wound spring. Mounting configuration matches factory bracket geometry. Spring rate calibrated for 20.3 Nm nominal torque at 74 mm pulley diameter. Cross-reference interchange includes Gates 38509, Vapormatic VPE6314, Case/IH 87801838, International 1687819C91, and A&I Products A-RE184034.