CUP 4,00X1,06 (Mitsubishi MB1B3909)

MB1B3909: A worn cup can allow fluid bypass, reducing system pressure and causing sluggish operation. The aftermarket replacement part references Mitsubishi as the OE maker and cross-references part number MB1B3909. This cup type serves as a sealing component that contains pressurized fluid within a confined bore. Its plain mechanical function is to maintain a tight seal between two mating surfaces during reciprocating motion. A concrete generic failure consequence is that a deteriorated cup may lead to internal leakage, resulting in loss of force or position holding. The catalog lists the spec as 00X1. Verify the serial number or application, then call (562) 693-7748.

Part number variants: MB1B3909, mb1b3909