Abstract: The invention concerns a lift truck with telescopic hoisting arm (2) mounted on a chassis carrying a front axle and a rear axle, in which the telescopic arm is articulated on the truck by means of a variable quadrilateral (A, B, C, D) having a tie rod (23) and an auxiliary arm (24), characterized in that:the tie rod (23) is articulated on the one hand to the chassis (1) at a point (D) situated substantially above the front axle (10) and on the other hand to the telescopic arm (2) at a point (A) which, in low position of the arm, is substantially above the rear axle (11),the auxiliary arm (24) is articulated on the one hand to the chassis (1) of the truck substantially at the geometric center (C) of the chassis and on the other hand to the telescopic arm (2) at a point (B) situated in back of point (A),and in that, in low position, the telescopic arm (2) is entirely situated below points (A) and (B) of the quadrilateral and rests on the auxiliary arm (24) in a practially horizontal position whereas in high pos