HYVA Front-End Hydraulic Cylinder Seal Kit ETG157X4280

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HYVA Front-End Hydraulic Cylinder Seal Kit ETG157X4280

Widely used in Hyva FE 157 / FC 157 series-or equivalent-4-stage and 5-stage front-end telescopic hydraulic cylinders for dump trucks.

Breakdown of Internal Components in the Repair Kit
1. Main Rod Seal:
Features an asymmetric lip design with a short, thick inner lip. When the dump truck bed carries loads of tens of tons and the system generates extreme instantaneous pressure, the lip presses tightly against the rod surface as pressure rises, ensuring "zero leakage" during the lifting process.
2. Wiper Seal: Features an exposed metal skeleton or a pure polyurethane snap-in structure. The primary lip scrapes away stubborn dried mud, sand, and stone dust adhering to the cylinder barrel from unloading or construction site operations, while the secondary lip retains a microscopic oil film to prevent the ingress of external moisture.
3. Wear Rings / Guide Strips: When a dump truck lifts on uneven terrain, the cargo bed generates immense lateral forces. These guide strips are specifically designed to bear such non-axial compressive loads, preventing direct metal-to-metal contact, scoring, or galling between the steel cylinder barrel and the piston rod.
4. O-Ring & Backup Ring: Used at threaded connections between cylinder stages and at static end-cap locations; they prevent the high-toughness O-ring from being extruded into the mating clearance under high-pressure surges.

Troubleshooting Recommendations
1. Thoroughly inspect for scoring/grooving: After disassembling the cylinder, carefully examine the surface of the 157mm cylinder section. If significant deep longitudinal grooves (scoring) caused by abrasive particles are present, simply installing a new repair kit will result in the new seals being damaged and leaking again shortly; in this case, the cylinder section must be repaired or replaced entirely.
2. Thoroughly clean the hydraulic oil tank: Oil leaks are often caused by metal debris or grit/sediment contaminating the hydraulic fluid. It is recommended to clean the hydraulic oil tank and replace the Hyva PT control valve or return oil filter element when installing the repair kit.

DETAILS

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