Rubber lip seal part number 1234003 123-4003 for loaders

Rubber lip seal part number 1234003 (123-4003) is used in loaders.

Rubber lip seals are contact sealing elements widely used in mechanical equipment, primarily to prevent liquid or gas leakage. Their core structure is a rubber ring with a lip, achieving a seal through an interference fit between the lip and the shaft surface.

Core Characteristics and Materials

Material Selection: Depending on the operating conditions, materials such as nitrile rubber (NBR), fluororubber (FKM), or polytetrafluoroethylene (PTFE) can be used. For example, fluororubber or PTFE composite materials are recommended for high-temperature, high-speed applications, with temperature resistance up to 200℃ or higher.

Structural Design: Commonly uses a double-lip structure. The main lip seals the medium, the secondary lip prevents dust, and the central oil reservoir replenishes lubrication (suitable for speeds >3000 r/min).

Application Scenarios

Construction Machinery: For example, lip seals are used to prevent leakage at the output shaft and housing of the hydraulic transmission system in loaders.

In the automotive industry: Polytetrafluoroethylene (PTFE) or fluororubber are commonly used materials for transmission crankshaft seals.

Installation and Maintenance Points

Lip Direction: During assembly, ensure the lip faces the flow direction to enhance sealing performance.

Interference Fit Control: The lip interference fit should be 0.5%~0.8% of the shaft diameter. Too tight a fit can cause overheating, while too loose a fit can lead to leakage.

Shaft Surface Treatment: For journals, hard chrome plating or ceramic coating is recommended. The surface roughness should be controlled at Ra 0.8~1.6μm to reduce wear.