109-0079 1090079 78.74mm inner diameter O-ring seal of 3412C 3408B 3408C

Q: What is part number 109-0079?
A: Part number 109-0079 is an o-ring sealing spare part produced for excavator hydraulic pump suction port connector sealing grooves.

Q: Which construction machine can the 109-0079 o-ring be installed for maintenance replacement?
A: The 109-0079 o-ring is suitable for low-pressure suction circuit sealing joints on excavator main hydraulic pump assemblies.

Q: What advantages does nitrile rubber bring for this suction port o-ring?
A: It maintains soft elasticity under negative pressure conditions and shows great tolerance to normal hydraulic oil media.

Q: What core sealing task does this o-ring undertake at the pump suction connector?
A: It seals the pipe connection gap to stop air from being sucked into the hydraulic system and avoid oil leakage outwards.

Q: Where will service technicians fit this o-ring on the excavator main hydraulic pump?
A: It is embedded inside the annular groove of the suction port pipe coupling mating surface.

Q: Can this o-ring keep reliable sealing under the negative pressure generated when the pump draws hydraulic oil?
A: Yes, it can cling tightly to the mating surface and maintain sealing even with continuous oil suction vibration.

Q: What factors will lead to premature failure of this nitrile rubber o-ring?
A: Rough contact surfaces on the connector and improper hose pulling force will tear or deform the rubber ring easily.

Q: What preparation and inspection work should be finished before mounting this new o-ring?
A: Clean sticky oil dirt and residual broken seal pieces, and check the connector seat for sharp scratches or burrs.

Q: What hydraulic abnormal phenomenon will occur once this o-ring loses sealing performance?
A: Air entering the suction circuit will cause pump cavitation, resulting in noise and unstable output of hydraulic power.