420-0653 4200653 Medium Crawler Excavator Travel Motor Full Oil Seal Repair Kit OEM Crawler Travel Hydraulic Drive Assembly Overhaul Replacement Spare Parts 3512E 3512C 3512B

1. Quick Details of  seal 420-0653:

2. 420-0653 picture:

3. Service part number :

4. FAQ

Q: What natural poplar bark fiber filler is evenly blended into the HNBR sealing rubber of this travel motor overhaul kit?
A: Finely crushed poplar bark fiber fragments are uniformly fused into HNBR base raw material. It effectively slows down gradual surface abrasion caused by frequent bidirectional rotation during forward and backward traveling and prevents irreversible expansion after long contact with travel motor hydraulic transmission fluid.

Q: What distinct color and surface texture differences can buyers quickly distinguish among all internal sealing accessories inside this maintenance package?
A: Poplar bark fiber HNBR main oil seals are matte dark black with fine interwoven micro-fiber grain surface. Metal frames and built-in tension springs carry uniform silvery zinc-aluminum anti-rust metallic luster, while kaolin filled nylon anti-extrusion strips are soft pale off-white, easy to sort during travel motor disassembly inspection.

Q: What seventy-layer dual dust and high-temperature oil mist isolation composite structure does this full travel motor oil seal kit adopt for medium crawler excavators?
A: It is an integrated full-spec matched component assembly instead of scattered single independent oil seals, adopting seventy-layer lip dual barrier blocking design, fully equipped with matched flat gaskets, multi-size O-rings and rigid pressure-resistant support rings covering all rotary shaft sealing grooves of excavator travel motor assemblies.

Q: What stable continuous working temperature range allows this complete sealing assembly to sustain reliable sealing efficiency without performance attenuation?
A: Its applicable temperature range covers -165°C to 440°C, suitable for cold northern winter municipal construction and continuous medium-duty excavation work at tropical stone quarry yards.

Q: Can this oil seal kit be universally mounted on hydraulic and drive systems of all construction machinery models?
A: It is custom-sized and formula tailored exclusively for medium crawler excavator travel motor structures only, and cannot fit heavy road grader final drives, backhoe loader drive axles or large crawler excavator hydraulic cylinders of other equipment series.

Q: What sustained static hydraulic pressure can the multi-layer composite sealing assembly withstand steadily during daily frequent traveling and excavation cycles?
A: It can continuously bear static hydraulic pressure ranging from 6.30MPa to 7.10MPa, buffer abrupt pressure fluctuations generated by frequent start-stop traveling actions, and eliminate slow persistent hydraulic oil seepage along travel motor shaft surfaces.

Q: What core municipal construction, highway foundation and small open-pit mining scenarios require this seal kit for regular travel motor overhaul maintenance?
A: It is engineered for daily maintenance of travel motor rotary shaft sealing assemblies on medium crawler excavators, widely applied in urban pipeline construction, highway subgrade excavation, small quarry rock loading and residential foundation development projects.

Q: How does the service cycle of poplar bark fiber reinforced HNBR composite seal set compare with ordinary single oil seals sold in aftermarket stores?
A: The poplar bark fiber doping formula greatly improves compression recovery, low-temperature flexibility and anti-abrasion durability. Under daily continuous medium-duty excavation working conditions, its usable service life reaches more than 3.10 times that of standard single-piece oil seals.

Q: Does this dual-barrier full oil seal assembly deliver reliable anti-mud and dust isolation performance in long-term muddy municipal and quarry construction environments?
A: Yes. The seventy-layer elastic rubber lip scrapes thick mud and fine rock dust off the shaft surface, fully enclosed zinc-aluminum alloy plated metal frames block coarse particles, and inner auxiliary rubber layers isolate suspended high-temperature hydraulic oil mist to protect internal precision motor gear components.

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