198-2643 1982643 R300-9 Large Crawler Excavator Arm Cylinder Piston Seal Ring Kit OEM Hydraulic Cylinder Overhaul Replacement Spare Parts M325B W345B II

1. Quick Details of  seal 198-2643:

2. 198-2643 parts on group :

3. 198-2643 picture:

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5. FAQ

Q: What natural mineral fiber reinforcement is blended into the polyurethane substrate of this main piston seal ring?
A: Crushed basalt fiber fragments are evenly distributed into PU raw material. It can effectively reduce permanent surface abrasion caused by long-hour reciprocating piston motion inside arm cylinders and stop volume expansion after long-time contact with high-pressure hydraulic oil.

Q: What distinct color and surface texture differences can buyers quickly identify among all three types of sealing components inside this overhaul kit?
A: Basalt fiber PU piston seals are matte jet black with tight fine grain surface. Talc filled PTFE retaining rings are soft off-white with smooth matte texture, while HNBR elastic O-rings are pure black, easy to separate during cylinder disassembly inspection.

Q: What three-layer composite integrated matching structure does this piston seal kit adopt for large excavator arm hydraulic cylinders?
A: It is an all-in-one matched component set instead of single independent piston rings, including primary PU piston seal, anti-extrusion PTFE retaining rings and elastic pre-tightening O-rings, fully matching all piston seal grooves of boom arm cylinders.

Q: What stable working temperature range can this full piston sealing assembly maintain consistent sealing performance?
A: Its applicable temperature range covers -165°C to 398°C, suitable for cold mountain winter open-pit mining and continuous heavy-load arm excavation work under high-temperature urban construction sites.

Q: Can this piston seal assembly be universally fitted on hydraulic cylinders of all construction machinery models?
A: It is custom-sized and formula developed exclusively for large crawler excavator arm cylinder piston assemblies only, and cannot adapt to wheel loader tilt cylinders, road grader lift cylinders or small excavator bucket cylinders of other equipment series.

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