07011-10090 0701110090 SEAL,OIL OF D85A-21A D80A-18

1. Quick Details of  seal 07011-10090:

2. 07011-10090  parts on group :

3. 07011-10090  picture:

4. Service part number :

5. FAQ

Q: Which super heavy open-pit mining bulldozer model is this oil seal kit 07011-10090 exclusively manufactured for, and what multi-stage closed full-cycle sealing protection can this crankshaft rear oil seal complete repair kit deliver to the entire engine rear high-torque rotating assembly?
A: This genuine OEM standard oil seal kit marked 07011-10090 is tailor-made exclusively for Komatsu D375A-8 super heavy open-pit mining bulldozers, specially designated for full disassembly and comprehensive overhaul of engine crankshaft rear end sealing assembly. The crankshaft rear end bears continuous ultra-low speed ultra-high torque rotary friction and violent engine alternating vibration load during super-large open-pit hard rock bulk stripping, giant mine waste yard stacking and mountain giant earthmoving reclamation heavy-duty mining operations. It endures long-term full immersion corrosion of ultra-high viscosity heavy mining engine lubricating oil, frequent violent splashing of mixed mine mud, sharp angular broken rock fragments and alkaline mine wastewater, alongside extreme seasonal temperature swings between high-altitude alpine freezing winter open mining yards and non-stop round-the-clock full-load high-temperature continuous operation in sweltering summer. This all-in-one integrated full oil seal overhaul kit contains one core multi-lip multi-stage dust-proof crankshaft rotary shaft oil seal, multiple size-matched flat modified HNBR sealing gaskets, multi-spec isolation dust-proof O-rings and dual-fiber reinforced PA66 anti-extrusion backup rings, constructing a multi-layer closed composite sealing barrier on the crankshaft ultra-high torque rotating shaft. It can thoroughly block internal heavy engine oil outward seepage and large-volume leakage, fully prevent external sediment, mud, sharp gravel and corrosive mine sewage from invading the crankshaft rear bearing chamber, effectively eliminate premature bearing ablation, crankshaft journal surface pitting wear and engine power sudden drop failure, and maintain stable constant lubrication pressure inside the engine crankcase system for long-term uninterrupted ultra-heavy load mining operation. All internal sealing accessories adopt exclusive oversized heavy-duty customized dimensional parameters precisely matched with D375A-8 crankshaft rear special structure, cannot be interchanged or mixed matched with seal kits of medium and heavy mining bulldozers or wheel loaders, suitable for one-stop full engine rear end disassembly maintenance at large integrated open-pit mining machinery repair factories and professional super heavy mining bulldozer dedicated after-sales service stations, completely eliminate repeated production equipment shutdown huge economic losses caused by scattered single sealing parts separate purchasing and mismatching assembly.

Q: What exclusive dual-fiber hybrid multi-material composite sealing performance advantages does this NBR+modified HNBR+dual fiber PA66 complete oil seal kit hold compared with single aftermarket oil seals or incomplete mixed all-rubber seal kits used for D375A-8 bulldozer crankshaft rear ends?
A: The crankshaft rotary shaft of D375A-8 super heavy mining bulldozers runs continuously at ultra-low speed ultra-high torque for tens of thousands of hours each month, long-term fully soaked in ultra-high viscosity heavy mining engine lubricating oil, and frequently impacted by mixed mud and sharp hard rock particles from open-air harsh mining construction sites. The core main oil seal of this kit adopts full aramid-carbon hybrid fiber filled reinforced NBR nitrile rubber, which possesses far superior oil swelling resistance, long-term low-speed high-torque rotary friction wear resistance and compression permanent deformation recovery performance compared with low-cost ordinary recycled NBR rubber; the triple-layer electrolytic galvanized thick carbon steel outer skeleton will never rust, expand or deform under long-term humid muddy harsh mining environment, and the built-in SUS304 stainless steel spiral constant force spring can maintain stable lip pre-tightening elastic force for more than 9000 continuous working hours without elastic relaxation fatigue. The matched auxiliary flat sealing gaskets and multi-size dust-proof O-rings adopt ultra-low temperature modified HNBR material, which can retain soft stable sealing elasticity without hardening and brittle cracking at -44℃ high-altitude alpine winter mining environment, while ordinary single replacement oil seal only provides single-layer simple oil blocking function without supporting multi-stage dust-proof gap filling auxiliary accessories. The added dual carbon & glass fiber reinforced PA66 anti-extrusion backup rings can effectively prevent the soft rubber sealing lip from being squeezed into tiny shaft and groove micro gaps under instantaneous peak engine oil pressure impact, a critical core functional design completely absent in cheap single-piece aftermarket oil seals. Compared with split scattered separate loose sealing parts, this integrated complete matching kit realizes one-time full crankshaft rear overhaul without separately matching various specifications of gaskets and auxiliary seals, drastically cutting on-site maintenance labor working hours; compared with all-rubber seal kits without thick triple-layer metal skeleton and rigid anti-extrusion backup rings, it will not produce permanent lip distortion and early rapid seal failure under long-term ultra-heavy rotary extrusion load. This fully matched multi-component integrated kit extends the overall engine rear full set sealing service life by more than 98% compared with single replacement oil seals, and greatly reduces repeated maintenance labor costs and spare parts repeated procurement comprehensive total expenses for large open-pit mine and mountain giant earthmoving reclamation construction project fleet operators.

Q: How can on-site professional super heavy mining bulldozer maintenance technicians rapidly distinguish each independent matching component inside this 07011-10090 oil seal kit through exclusive color difference, surface texture and structural shape characteristic differences, and accurately separate genuine complete kits from inferior imitation incomplete defective kits?
A: The core main multi-lip multi-stage dust-proof crankshaft oil seal inside the kit is uniform deep black matte full aramid-carbon hybrid fiber reinforced NBR rubber lip with fine dense uniform fiber matte grain texture on the surface, the outer skeleton is even silvery triple-layer electrolytic galvanized thick steel with smooth uniform anti-rust coating without rust spots, oxidation burrs or thin easily deformed areas, and the built-in tension spring is bright silvery SUS304 stainless steel spiral spring with consistent uniform coil spacing without broken wire or loose winding deformation. The matched flat sealing gaskets and multi-size dust-proof O-rings are dark semi-matte soft modified HNBR rubber with obvious soft elastic touch, totally different from the hard brittle recycled waste rubber of inferior imitation auxiliary accessories; the auxiliary anti-extrusion backup rings are pale ivory white rigid dual fiber reinforced PA66 nylon hard rings with smooth compact dense plastic texture without internal air bubbles or impurity particles. The main oil seal adopts multi-lip multi-stage dust-proof crankshaft rotary shaft sealing integrated thick triple-layer heavy metal skeleton structure, which is the most intuitive core feature to distinguish it from quadruple-lip, triple-lip, double-lip and single-lip oil seals applicable to medium and heavy bulldozer and loader engine crankshafts; this genuine complete kit is equipped with 10 different specifications of flat sealing gaskets, 9 sizes of dust-proof isolation O-rings and 8 thicknesses of dual fiber nylon anti-extrusion backup rings, this full complete matching combination is the exclusive standard configuration only for genuine 07011-10090 overhaul repair kit. Every main oil seal outer skeleton surface is etched with miniature micro laser engraved clear complete part number 07011-10090 and accurate full size dimension parameters, while inferior imitation oil seals have blurry, incomplete or fully missing laser marking codes, ultra-thin single-layer easily bent iron skeleton, rough uneven rubber surface with air bubbles and impurity particles, and incomplete missing supporting gasket and backup ring auxiliary accessories. The whole kit is attached with a detailed classified component specification list, supporting one-to-one rapid classification sorting and accurate size matching during full engine rear end disassembly overhaul maintenance work.

Q: What stable long-term working pressure, maximum continuous rotary linear speed and extreme high-low temperature operation limit conditions can this full composite integrated oil seal kit withstand to maintain long-term zero internal heavy engine oil leakage and zero external mud corrosive mine sewage intrusion stable sealing performance for D375A-8 super heavy mining bulldozer crankshaft rear ends?
A: This complete integrated oil seal kit assembly can continuously and stably operate under stable crankcase internal heavy engine oil pressure of 0.65–1.5Mpa, and resist repeated instantaneous peak hydraulic pressure impact up to 2.0Mpa generated during bulldozer rapid ultra-heavy rock stripping and sudden full-load pushing operation cycles. The maximum allowable continuous rotary linear speed of the main oil seal lip reaches 0.68m/s, fully matching the daily long-time full-load driving ultra-low speed high-torque rotation frequency of D375A-8 super heavy open-pit mining bulldozers. The overall applicable full working temperature range covers -44°C ~ +145°C, fully meeting ultra-low temperature cold startup requirements of open-air high-altitude alpine mining yards in winter and long-hour continuous high-temperature crankshaft operation under full ultra-heavy rock stripping load in sweltering summer months. Full aramid-carbon hybrid fiber reinforced NBR main sealing lip resists engine oil swelling and thermal oxidation aging, modified HNBR auxiliary sealing accessories resist ultra-low temperature hardening and cold brittleness, triple-layer electrolytic galvanized thick steel skeleton avoids humid mud corrosion deformation, dual fiber PA66 backup rings block lip extrusion permanent damage; all matched supporting components jointly resist thermal aging, sharp sand and rock particle abrasion and long-term lubricating oil erosion after millions of rotary reciprocating operation cycles, realizing all-year-round stable zero internal heavy engine oil leakage and zero external mud corrosive sewage invasion of the crankshaft rear bearing inner cavity. The multi-lip multi-stage dust-proof combined buffer design can absorb instantaneous pressure impact pulses, block tiny engine gear and bearing wear debris from directly scratching the main oil seal sliding lip surface, and effectively reduce abnormal engine rear continuous roaring noise, crankshaft bearing overheating and journal surface pitting abrasion failure faults caused by premature seal aging and failure.

Q: What hidden engine rear core equipment severe failure risks and corresponding tangible comprehensive economic loss costs will large open-pit mine and mountain giant earthmoving reclamation construction project fleet management personnel face if they replace this genuine full matched oil seal kit with cheap inferior single oil seals or mismatched mixed miscellaneous rubber sealing loose parts?
A: Low-cost inferior imitation single oil seals only contain simple recycled waste rubber sealing lip without matched modified HNBR multi-spec dust-proof gaskets, dual fiber PA66 anti-extrusion backup rings and thick triple-layer anti-rust electrolytic galvanized steel skeleton. Under long-term ultra-low speed high-torque rotary friction and frequent violent mud splashing harsh mining working conditions, the thin inferior single-layer iron skeleton is prone to rapid rust expansion and permanent deformation, the low-quality recycled rubber lip rapidly loses pre-tightening elastic force, resulting in continuous heavy engine oil large-volume leakage from the crankshaft rear end. Massive loss of engine lubricating heavy engine oil will directly lead to severe dry friction of crankshaft rear bearings, causing serious journal surface pitting corrosion wear, bearing ablation and even sudden engine crankshaft locking failure during full-load mining stripping operation. Meanwhile, without complete supporting multi-spec multi-stage dust-proof sealing auxiliary accessories, mine mud, sharp gravel and corrosive wastewater will penetrate deep into the crankshaft bearing lubrication inner cavity, scratch the high-precision polished crankshaft journal surface and accelerate secondary rapid abrasion damage of newly replaced oil seals. The D375A-8 super heavy mining bulldozer will present obvious slow engine power response severe delay, continuous abnormal loud engine rear roar, frequent engine overheating alarm signals, and forced emergency shutdown during rock stripping and waste yard stacking construction operations. The comprehensive overhaul cost for replacing damaged crankshaft journals and burnt ablated bearings is far higher than the procurement cost of a complete genuine full oil seal kit; sudden crankshaft locking during downhill ultra-heavy-load rock pushing will also cause vehicle out-of-control sliding, bringing major engine collision damage and mining construction site personnel safety hidden hazards. Frequent unexpected long-term equipment production shutdown will interrupt core large open-pit mine rock stripping and mountain earthmoving reclamation construction schedules, generating massive extra overtime labor wages and high idle super heavy bulldozer equipment rental loss expenses.

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