707-99-69590 7079969590 Arm Cylinder Seal Kit For PC490LC-10 PC490-10 Komatsu Arm Cylinder Repair Kit

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FAQ:
1. What should I do if I only know the excavator model but cannot provide the excavator number and model?
A: If possible, you can send us pictures of old products, nameplates or sizes for reference.

2. How to pay for the order?
A: We can receive payment by T/T, Western Union, Paypal, bank transfer.

3. When will I receive the order after placing the order?
A: After confirming your payment, we will send the goods within 3 days; if there is no stock, we will inform you before placing the order.

4. What should I do if there is a problem with the product?
A: First of all, I have confidence in the quality of our products, if you really find something wrong, please provide us with pictures and we will check.

5. What is your main product?
A: We specialize in the production of O-rings, reciproC.A.Ting rings, oil seals, piston seals, piston rod seals, and other hydraulic seals as well as hydraulic seal kits, such as boom/ arm/ bucket cylinder seal kits, center joint seal kits, hydraulic pump seals Kits, travel motor seal kits, swing motor seal kits, transmission seal kits, control valve seal kits, oil seals, floating seals, etc.

Common failure causes and improvement measures of seals:

Rubber compression rate For rubber rings used for low friction motion, in order to reduce the friction and pick resistance, the design requirements stipulate that a smaller compression rate should be selected, generally 5% to 8%. Excessive compression rate will cause large shear deformation, while the resistance to shear deformation of the rubber seal ring is much smaller than the resistance to compression deformation, which increases the sliding friction and permanent deformation of the rubber seal, damages the surface and reduces the amount of compression. In severe cases, the friction will quickly cause damage to the surface of the rubber seal, resulting in seal failure.

Seal groove, in any case, the area of the square groove is larger than the cross-sectional area of the O-ring. The volume increase caused by the expansion of the O-ring must be considered. Therefore, the assembled rubber seal and groove must be It is necessary to leave a proper gap between the walls, but the gap should not be too large, otherwise it will become a harmful gap under the action of alternating pressure, which will increase the wear of the seal. Generally, the groove design should follow the The following principles: the height of the groove is 0.7~0.8 times the width of the groove, and the cross-sectional diameter of the O-ring seal is between 1.3 and 1.35 times the height of the groove.