Zoomlion Crane Outrigger Cylinder and Seal Kit

Outrigger jack cylinders, horizontal extension cylinders, seal kits and load-holding valves for Zoomlion truck cranes. Zoomlion's QY25V brochure puts the 25 t machine on a 5.15 m by 6.1 m outrigger spread at 29,400 kg in driving condition, 22,900 kg of it on the rear axle group, and it prints separate lifting tables for outriggers fully extended and intermediately extended — so the horizontal beams are worked at two positions and both cylinder types see service. The ZTC250V that replaced it travels at 29,600 kg, and the ZTC550V at 42,000 kg with more than twice the base boom moment, which puts its jack cylinders a bore class above the 25 t cranes. A crane has four vertical jacks and four horizontal extension cylinders, and some builds add a fifth jack under the front of the chassis; front and rear jacks are not always the same part, so name the corner on the enquiry. A leg that sinks slowly under load usually points to the piston seal or the pilot-operated check valve on the cylinder rather than a damaged barrel, so say whether the leg creeps down, will not retract or leaks at the rod before ordering a complete cylinder. Send the rod diameter, the retracted pin-to-pin length and the stamping on the barrel together with the chassis nameplate.