245-6835 2456835 Weatherproof Hydraulic Cylinder Seal Kit for Mobile Crane Hydraulic System D9N D9 GC

1. Quick Details of  seal 245-6835:

2. 245-6835 parts on group :

3.  245-6835 picture:

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5. FAQ

Q: What performance features make anti-fatigue PU ideal for the dynamic sealing of crane cylinders?
A: The boom cylinders of mobile cranes need to perform telescopic actions thousands of times every day under different hoisting weights. This anti-fatigue PU material is optimized for long-cycle repeated movement. It will not produce permanent deformation or loose sealing after continuous compression and rebound. It maintains a tight fit with the cylinder rod and piston all the time, even when the crane shakes slightly during hoisting and traveling. Its stable physical properties ensure consistent sealing effect throughout the whole service period and avoid performance decline caused by fatigue aging.

Q: How do mineral-filled PTFE backup rings cooperate with main seals to enhance overall durability?
A: Natural PTFE is soft and easy to deform under ultra-high pressure. After adding mineral fillers, its overall rigidity and compression resistance are greatly improved. Installed next to the main PU seals, these backup rings fill the gaps of installation grooves completely. When the crane lifts overweight goods or the boom suddenly changes angle to generate instant pressure surges, they share the impact pressure in real time and prevent the sealing lips from being squeezed and damaged. In addition, its good self-lubricating property reduces the friction coefficient between moving parts and makes the cylinder run more smoothly.

Q: What practical functions do multi-layer felt guide rings realize during piston movement?
A: When the crane boom bears eccentric hoisting loads, the piston will be subject to unbalanced lateral thrust. The multi-layer felt guide ring can absorb and disperse this eccentric force effectively, guiding the piston to move along the central axis stably. It minimizes direct friction between metal parts and greatly lowers operating noise. The soft layered structure also has excellent shock absorption performance, buffering the slight jolts generated when the crane travels on uneven roads, and further protecting the internal precision components.

Q: Are all parts manufactured in accordance with original equipment size standards?
A: Every seal, O-ring, backup ring and guide ring is produced strictly following OEM design drawings and dimensional parameters. The inner diameter, outer diameter and thickness of each component are fully consistent with the original factory parts. Maintenance personnel do not need to cut, grind or modify the cylinder and grooves during replacement, and all parts can be installed in place accurately for a perfect match.

Q: What important guidelines should be followed during disassembly and field installation?
A: Before installation, thoroughly clean the cylinder inner wall, piston surface and mounting grooves to remove residual old seal fragments, sludge and deteriorated hydraulic oil. Do not use sharp tools to pry or bend new seals, so as to prevent surface damage and hidden failures. Apply a thin layer of clean hydraulic oil to lubricate each component before assembly, and install parts in the designated order. After assembly, conduct low-load trial operation first to check for stuck movement, abnormal noise or oil leakage.

Q: Can customers purchase individual accessories separately instead of the full complete kit?
A: This product is mainly sold as a complete set, which is designed for one full maintenance of a single hydraulic cylinder. Using the matched full kit can ensure the coordinated service life of all components. If individual parts are accidentally damaged during installation or use, you can provide detailed size and style information, and we can supply the corresponding single parts separately.

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