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1U3998 Seal A Fits Caterpillar Models
1U3998 Seal A Fits Caterpillar Models
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£20.00 GBP
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One New Aftermarket Replacement Piston Seal for Caterpillar (Cat) Equipment
This hydraulic piston seal is a direct aftermarket replacement for Caterpillar (Cat) OEM part number 1U3998. It is used in hydraulic cylinder applications to prevent fluid bypass past the piston, maintaining cylinder force and efficiency. The seal is constructed from a PTFE/NBR composite, a proven combination for heavy-duty hydraulic service offering excellent wear resistance and fluid compatibility.
Specifications
- Part Type: Hydraulic Piston Seal (2-piece)
- Inner Diameter: 1.880 in.
- Outer Diameter: 2.250 in.
- Width / Height: 0.190 in.
- Material: PTFE/NBR composite
Compatible Models
Caterpillar (Cat): Refer to your machine's model and serial number to confirm cylinder fitment. This seal fits Caterpillar hydraulic cylinders calling for OEM part 1U3998.
Replaces Part Number(s):
1U3998
Aftermarket Interchange Numbers
CTC-1U3998, CTC-1U3998A
New aftermarket replacement part - not remanufactured, not used.



