Baoli CPCD 80 Operating And Servicing Manual
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817. Lift cylinder & tilt cylinderLiftcylinderType Single-action piston type, with cut-off valveBore diameter Φ100Stroke 1495mm (Only for 3m lift height)TiltcylinderType Double-action piston typeBore diameter Φ115Stroke 242mm7.1 Lift cylinderThe two lift cylinders of single acting type are used and located behind each outermast frame. The bottoms of the cylinders are sustained by the mast support of the outermast while the tops of cylinders, or the piston rod tops are inserted into the upper beamof the inner mast.The lift cylinder assembly consists primarily of a cylinder body, piston, piston rodand cylinder cap. At the lower part of the cylinder body is arranged an inlet forhigh-pressure oil, and at the upper part there is an outlet for low-pressure oil above thepiston packing, to which a return pipe is connected.The piston is fastened to the piston rod with a steel clamp. A wear ring, packingand back-up ring are attached to the outside periphery of the piston which is movedalong the inner surface of the cylinder by high-pressure oil. An oil seal and bushing areinstalled on the cylinder cap which is screwed into the cylinder body. The bushingsupports the piston rod, and the oil seal prevents dust from entering the cylinder. Theupper end of the piston rod and inner mast upper beam is locked with bolts.When the lift lever is tilted backward, high oil pressure is sent into the lift cylindersthrough their inlets to push up the piston rods and the piston head, causing the forks torise through chains. The height from the ground to the fork upper position when theinner mast channel beam upper ends exceed the outer mast upper ends is called “Freelift” . Within this range, the mast height does not vary.With the lift lever tilted forward, the piston rods of the lift cylinders descend by theweights of the piston rods, inner mast, lift bracket, finger bar and forks, causing oil underthe piston to flow out of the cylinders. The oil discharged from the cylinders is regulatedby the flow regulator and returns through the control valve to the oil tank.The structure of the lift cylinder is shown in Fig. 7.1.Note: Please pay more regard to safety when adjusting the lift cylinder. |
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