QY55KA-Y Fifth Outrigger Cylinder Seal Kit W7
The fifth outrigger works in a demanding stabilizing position. A correct W7 seal kit must match the actual cylinder bore, rod and gland—not just the crane model.
The Match That Matters
QY55KA-Y machine serial number
Fifth-outrigger cylinder code
Rod and bore dimensions
Old seal profiles and material markings
Gland, piston and wear-ring condition
Buyers care most about whether every seal is included and whether the kit matches the cylinder actually installed on their crane.
What the Symptom Really Tells You
Oil on the rod may indicate a rod seal, but scoring, bent rod, contaminated oil or excessive side load will quickly damage a new kit.
Workshop Notes
Support the crane safely, dismantle in a clean area and inspect chrome, bore and grooves. Lubricate seals correctly, protect lips during assembly and pressure-test for drift and leaks.
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Buyer FAQ
Is W7 enough to confirm the kit?
Confirm the cylinder code and dimensions.
Will new seals repair a scored rod?
No; the damaged surface must be repaired.
What should be replaced together?
Inspect wear rings, wiper and guide components.
Packing: Profiles are individually bagged and protected from heat, dust and deformation.
