The hydraulic sleeves are provided with grooves for the oil injection, greatly facilitating the disassembly of the set(Bearing and hydraulic sleeve), especially after long time of using. The hydraulic sleeves have thin walls and, when mounted far from the face of the axle, they require a connection suitably small, so that the hydraulic pump can be connected correctly. To meet this need the BGL has extension tubes suitable for every possibility of oil entering into the sleeves, being M4, M6, M8, G1/8, G1/4 joined at the other end with thread ¼ BSP to be connected with the hose of the pump outlet.
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