ZZ Industrial hydraulic seal kit makes equipment look brand new

The hydraulic seal kit is a core maintenance component used for the maintenance and repair of the hydraulic system of manual hydraulic pallet trucks. It includes a complete set of seals designed to repair leaks in hydraulic cylinders (lifting cylinders, lowering valves), restore the rated lifting capacity and smooth operability of the equipment, and extend the service life of the entire vehicle. For ZZ Industrial, providing high-quality sealing kits is a key part of its parts business and after-sales service.

Core components and functions
A standard hydraulic seal kit typically includes the following components, each corresponding to a critical sealing point in the hydraulic system:
Piston Seal/Cup Seal: The most important component in the kit. Installed on the hydraulic piston to prevent oil leakage between the piston and cylinder, it is the core seal that generates and maintains lifting pressure.
Guide Ring/Wear Ring: Typically made of wear-resistant polymer. Installed on the piston or cylinder end, guide the piston to move in the center of the cylinder, prevent direct contact and scratching between metals, and reduce friction and wear.
O-ring: Multiple specifications, used for static sealing. Commonly seen in:
Piston head O-ring: auxiliary main seal.
Valve core/control rod O-ring: Seal manual control valve (lowering valve, gradual lowering valve).
End cap/joint O-ring: seals the connection between the cylinder end cap, oil pipe joint, etc.
Installed on the outside of the hydraulic cylinder port. The main function is to prevent external dust and dirt from entering the hydraulic system, while scraping off impurities attached to the piston rod during the return stroke, and protecting the internal seals.
Spare or specialized seals: Depending on the vehicle model, it may also include releasing valve core seals, adjusting screw seals, etc.
Optional accessories: Some high-end kits or complete repair kits may include hydraulic oil, new end cap bolts/washers, cleaning cloths, etc.

Applicable models and importance
Applicability: Sealing kits are usually classified according to the rated load capacity of pallet trucks (1.5 tons, 2 tons, 2.5 tons, 3 tons, etc.) and hydraulic cylinder models/brands. ZZ Industrial needs to ensure that the kit is fully compatible with its own and mainstream models in the market, such as common models with fork widths of 550mm and 685mm.
Repair scenario: When the pallet truck shows the following symptoms, it indicates the need to replace the sealing kit:
Unable to lift or reach the highest point.
The fork slowly descends on its own (internal leakage).
Oil leakage is visible on the outside of the hydraulic cylinder.
The lifting or lowering operation is not smooth and there is a lag.
Value proposition: Using high-quality sealing kits for preventive maintenance or repair is highly cost-effective compared to replacing the entire hydraulic cylinder or purchasing a new car. It can ensure the safe and reliable operation of equipment, avoiding handling accidents and production interruptions caused by leaks.

Material and Quality
Seals of high-quality kits are usually made of hydraulic oil resistant, wear-resistant and anti-aging materials:
Polyurethane (PU): widely used in main piston seals and dust seals, known for its excellent wear resistance, high elasticity, and pressure bearing capacity.
Nitrile Rubber (NBR): The most commonly used O-ring material with excellent oil resistance and cost-effectiveness.
Polytetrafluoroethylene (PTFE) or composite material: used for guiding rings, providing extremely low friction coefficient and excellent wear resistance.
Quality assurance: ZZ Industrial should ensure that the material of the kit meets industry standards and the dimensions are accurate to ensure sealing performance and service life.