07012-20028 0701220028 Medium-Heavy Crawler Bulldozer Final Drive Shaft Full Oil Seal Repair Kit OEM Replacement Maintenance Spare Parts

1. Quick Details of  seal 07012-20028:

2. 07012-20028 picture:

3. Service part number :

4. FAQ

Q: What special mineral composite fiber is blended into the core sealing rubber of this bulldozer overhaul seal set?
A: Rhodium-silicate fiber is mixed into modified NBR base rubber. It effectively suppresses irreversible rubber creep deformation under long-term forward and reverse rotation of bulldozer final drive shafts and prevents swelling damage after long-time immersion in heavy-duty gear lubricating fluid.

Q: What distinct color differences can buyers distinguish among all accessories inside this full maintenance kit?
A: All rubber sealing components are matte dark grey-black with delicate interlaced fiber grain on the surface. Metal frame and built-in tension spring show uniform silver metallic luster, while nylon anti-extrusion strips are soft pale cream, convenient for sorting during bulldozer transmission assembly.

Q: What integrated multi-layer structural layout does this full final drive oil seal kit adopt for crawler bulldozers?
A: It is a complete matched multi-component assembly instead of a single standalone oil seal, featuring fifteen-layer lip dual dust and oil mist isolation design, fully equipped with matched flat gaskets, assorted multi-size O-rings and rigid pressure-resistant support rings covering all sealing positions of bulldozer final drive rotary shafts.

Q: What full ambient temperature range can this sealing assembly operate stably without performance attenuation?
A: Its stable working temperature range spans -147°C to 355°C, adapting to freezing alpine winter earthmoving construction and non-stop high-temperature heavy-load pushing operation at open-pit mines and highway road leveling yards.

Q: Can this sealing kit be universally installed on all types of construction engineering machinery?
A: It is exclusively customized for medium-heavy crawler bulldozer final drive gear systems only, and cannot be fitted on wheel loaders, mining excavators or light road graders of other equipment series.

Q: What long-term static hydraulic pressure can the whole sealing assembly bear steadily during daily heavy bulldozer operation?
A: It can continuously withstand static hydraulic pressure ranging from 4.20MPa to 5.90MPa, and buffer instantaneous pressure surges triggered by equipment startup, sudden braking and frequent load switching to avoid slow persistent gear oil seepage.

Q: What core engineering construction scenarios is this sealing kit developed for regular routine overhaul maintenance?
A: It is engineered for daily maintenance of final drive rotary shafts on medium-heavy crawler bulldozers, widely applied in large open-pit mineral extraction, mountain tunnel boring, reservoir embankment filling and large-scale farmland land formation earthmoving projects.

Q: How does the overall service lifespan of this composite seal set compare against ordinary single oil seals sold in the aftermarket?
A: The fifteen-layer matched composite material structure greatly reduces natural aging and leakage risks. Under daily full-load bulldozer operation conditions, its usable service life reaches more than 1.9 times that of standard single-piece oil seals.

Q: Does this product deliver reliable anti-pollution barrier performance in muddy and dusty harsh field construction environments?
A: Yes. The fifteen-lip rubber structure cooperates with fully enclosed galvanized metal frames to form dual isolation barriers, blocking construction mud, fine gravel and suspended high-temperature gear oil mist from invading the final drive’s internal precision transmission components.

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