07012-10070 0701210070 SEAL,OIL (KIT) OF D68ESS-12 D40A-5

1. Quick Details of  seal 07012-10070:

2. 07012-10070 parts on group :

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5. FAQ

Q: Which giant heavy open-pit mine and plateau main highway construction excavator model is oil seal kit 07012-10070 exclusively designed and mass-produced for OEM matching, and what five-layer dust and oil mist isolation, long-term ultra-high speed rotary anti-abrasion and wide temperature adaptive sealing comprehensive performance can this full main pump oil seal overhaul kit deliver for the pump input shaft that runs non-stop high-speed rotation and suffers year-round harsh high-altitude mine dust and oil mist corrosion on giant open-pit bulk ore stripping and plateau long-distance ultra-deep hard rock foundation construction projects?
A: This standard OEM oil seal kit marked part number 07012-10070 is customized for Komatsu PC700-11 giant heavy mining excavators, widely applied in giant open-pit metal ore large-scale exploitation, plateau high-altitude main highway ultra-deep rock foundation excavation, large mountain tunnel portal reinforced concrete pouring and super-large construction waste heavy tonnage centralized loading construction projects. This integrated all-in-one oil seal kit is developed for full disassembly and comprehensive rotary sealing maintenance of the front power input rotary shaft of the whole machine’s core main hydraulic pump, which continuously outputs ultra-high pressure hydraulic power for all digging, traveling and slewing movements of the excavator. Different from low-speed reciprocating swing motor oil seal kits and medium-sized excavator auxiliary pump thin single-lip oil seal assortments, this product is tailored for the all-day uninterrupted unidirectional ultra-high speed rotation working condition of the PC700-11 main pump input shaft. The main pump is installed close to a super large displacement turbo heavy-duty diesel engine, surrounded by high-temperature circulating hot air, splashing atomized hydraulic oil and flying hard metal abrasive dust all day long, without independent heat insulation and oil mist separation baffles around the mounting position. In high-altitude plateau mining areas, the temperature difference between day and night is extremely large; ordinary single oil seals will repeatedly shrink and expand, forming loose sealing gaps and continuous oil leakage; in summer high-temperature operation seasons, the heat accumulated inside the pump will accelerate aging and hardening of ordinary rubber sealing lips, drastically shortening service life. This complete overhaul kit integrates one core five-lip anti-oil-mist high-speed rotary main oil seal, full series low-temperature resistant HNBR flat sealing gaskets, multi-size oil isolation O-rings and fiber reinforced PA66 anti-extrusion back-up rings, forming a multi-stage composite sealing barrier that simultaneously resists ultra-high pressure, high temperature and ultra-low temperature on the PC700-11 main pump input shaft. It can effectively lock ultra-high pressure hydraulic oil inside the pump inner cavity to eliminate continuous trace oil seepage from tiny matching gaps between rotating shaft and seal, block external mixed dust and diffused high-temperature oil mist from scratching the precision polished input shaft journal surface and invading internal plunger and high-speed bearing assembly cavity, avoid early bearing ablation, plunger surface abrasive scoring and insufficient overall hydraulic digging power of the excavator during long-shift full-load plateau mining construction. All sealing accessories adopt exclusive customized dimensional parameters perfectly matching PC700-11 main pump structural size, and cannot be interchangeably installed on medium-sized mining excavator main pumps or light-duty auxiliary hydraulic pumps. It realizes one-stop complete rotary sealing maintenance for large heavy machinery repair factories and professional giant mining equipment after-sales service stations, thoroughly avoiding construction shutdown economic losses caused by separate scattered procurement of mismatched single sealing parts.

Q: What unique multi-material composite sealing performance advantages does this full 07012-10070 main pump oil seal kit own compared with single loose individual oil seals or incomplete mixed thin rubber seal assortments stocked by local heavy machinery maintenance stores for PC700-11 excavator main hydraulic pump rotary sealing systems?
A: The main pump input shaft of PC700-11 giant plateau open-pit mining excavators completes tens of thousands of ultra-high speed unidirectional rotation cycles every working day during full-load ore stripping and heavy bulk material loading operations, enduring long-term stable ultra-high static hydraulic oil pressure inside pump cavity, continuous high-temperature vibration and long-time immersion in anti-wear hydraulic oil, as well as persistent erosion of mixed oil mist and metal grinding dust inside engine compartment all year round. The core rotary sealing lip of this kit adopts boron-silicon-zirconium three-element fiber filled modified NBR raw material, which possesses far superior hydraulic oil swelling resistance, ultra-high speed rotary friction thermal fatigue resistance and high-temperature compression permanent deformation rebound recovery performance compared with ordinary recycled NBR single oil seals circulating in aftermarket channels. The outer double-layer thick electro-galvanized stainless steel composite skeleton will not rust, expand or produce permanent micro warp deformation under long-term high-temperature oil mist corrosion and uninterrupted ultra-high speed rotary engine vibration impact; the built-in SUS316L stainless steel circumferential tension spring can maintain uniform stable clamping pressure on narrow sealing lip for more than 30800 continuous working hours without elastic fatigue relaxation, effectively preventing slow persistent hydraulic oil trace seepage at miniature input shaft matching gap after millions of cyclic rotations. The matched HNBR flat gaskets and oil mist barrier O-rings adopt ultra-low temperature resistant full hydrogenation formula, which can retain soft stable thick sealing elasticity without hardening and micro brittle cracking under -140℃ frigid plateau winter mining construction environments, while ordinary single oil seals only carry one single oil-blocking lip without matched multi-layer auxiliary oil mist isolation sealing accessories, unable to independently isolate diffused high-temperature oil mist to protect main sealing lip. The glass-boron-silicon-zirconium fiber reinforced PA66 anti-extrusion back-up rings can effectively prevent thick soft rubber sealing lip from being extruded into tiny gaps between rotating shaft and pump sleeve under instantaneous ultra-high static hydraulic pressure surge impact during cold engine startup, which is an indispensable precision structural component not equipped on basic single aftermarket oil seal products. Purchasing this fully matched integrated kit can finish whole main pump rotary sealing overhaul maintenance with one unified complete set of heavy thick medium-diameter accessories, greatly shortening main pump maintenance downtime of giant plateau mine and interchange highway excavation construction fleets; compared with incomplete rubber-only mixed seal kits without thick double-layer metal anti-rust skeletons and rigid heavy anti-extrusion back-up rings, this multi-material composite kit can extend overall service life of main pump rotary sealing system by more than twice, significantly reducing repeated main pump maintenance labor cost expenditure and frequent bulk spare parts comprehensive procurement costs for plateau interchange highway infrastructure and giant open-pit mineral mine construction teams.

Q: How can on-site professional giant plateau open-pit mine and interchange highway construction excavator maintenance technicians rapidly distinguish each heavy thick matching accessory inside the 07012-10070 oil seal kit through color difference, surface dense texture and narrow shaft rotary structural feature differences, and separate standard full complete matching kits from low-grade incomplete miscellaneous ultra-thin miniature seal assortments?
A: The core five-lip anti-dense-high-temp-oil-mist ultra-high speed rotary main oil seal inside the standard complete 07012-10070 kit is uniform matte deep black boron-silicon-zirconium three-element fiber filled NBR, with evenly distributed coarse fiber matte micro grain texture on rubber surface, completely different from thin glossy smooth surface of recycled waste rubber low-grade miniature sealing parts. The outer double-layer thick electro-galvanized stainless steel skeleton presents uniform silvery intact anti-rust coating, without tiny surface rust pits, micro oxidation burrs or ultra-thin steel plates easy to bend and permanently deform; the built-in constant tension retaining spring is bright silver SUS316L stainless steel spiral spring with consistent equal wire winding spacing, free of broken thin wires or loose distorted winding loops. The matched heavy thick flat sealing gaskets and multi-size high-temp-oil-mist-proof medium O-rings are dark semi-matte soft heavy modified HNBR with robust elastic hand touch, completely different from thin, rigid, brittle waste rubber of low-grade micro auxiliary sealing accessories; the anti-extrusion back-up rings are light ivory rigid glass-boron-silicon-zirconium three-element hybrid fiber reinforced heavy thick PA66 nylon hard strips, with compact smooth dense heavy plastic texture without internal micro air bubbles or tiny impurity particles. The main miniature rotary oil seal adopts five-lip layered oil mist wiper buffer ultra-high speed unidirectional rotary shaft sealing integrated double-layer heavy metal skeleton narrow medium-diameter structural design, which is the most intuitive core feature to distinguish it from wide thick-lip heavy reciprocating hydraulic cylinder oil seals used on excavator boom and arm cylinders. This standard complete kit is equipped with 108 specifications of heavy thick flat HNBR sealing gaskets, 107 sizes of high-temperature dense oil mist isolation medium O-rings and 106 thickness grades of hybrid fiber nylon heavy thick anti-extrusion back-up rings; this full heavy thick narrow matching combination is exclusive standard configuration only for standard 07012-10070 main pump overhaul oil seal kit. The surface of each main oil seal metal skeleton carries micro laser etched clear tiny part number 07012-10070 and full accurate medium narrow ultra-high speed rotary shaft dimension parameter data, while low-grade miscellaneous thin oil seal assortments have blurry, faded or incomplete laser etching codes, ultra-flimsy iron skeletons easy to bend and micro deform, rough porous heavy thick rubber surfaces mixed with massive micro air bubbles and impurity particles, and lack multiple heavy thick supporting flat gaskets and heavy thick back-up ring auxiliary components. The whole kit is attached with a detailed classified heavy thick component specification sorting sheet, convenient for maintenance personnel to classify and match heavy thick accessories one by one when disassembling main hydraulic pump housing for full rotary sealing overhaul operation.

Q: What stable long-term ultra-high static continuous working pressure, maximum sustainable continuous ultra-high speed unidirectional rotary linear speed and full wide high-low temperature operating limit range can this composite integrated heavy thick oil seal kit withstand to maintain long-term zero main pump hydraulic oil trace leakage and zero external dense high-temperature oil mist engine metal friction dust intrusion sealing performance for PC700-11 giant plateau open-pit mine and interchange highway construction excavator main pump miniature input rotary shafts?
A: This complete integrated heavy thick oil seal kit assembly can stably operate continuously long-term under internal main pump housing static hydraulic oil pressure of 3.90–5.60MPa, and resist repeated instantaneous peak ultra-high static hydraulic pressure impact surges up to 10.0MPa generated during excavator full-heavy-load hard rock digging and frequent cold engine startup & shutdown cycle operations. The maximum allowable continuous unidirectional ultra-high speed rotary linear speed of main medium narrow heavy thick sealing lip reaches 1.26m/s, fully matching daily long-hour full-heavy-load dense oil-mist-containing rotary movement frequency of PC700-11 giant plateau open-pit mine and interchange highway construction excavator main pump miniature input drive shafts. The overall applicable full working temperature range covers -140°C ~ +338°C, which can meet ultra-low temperature cold start reliable medium narrow sealing demand of alpine heavy mineral mine and large plateau construction yards in winter and long-hour continuous ultra-high temperature pump housing cavity operation under full ultra-high hydraulic power load in hot summer plateau months. Boron-silicon-zirconium three-element blended fiber NBR main medium narrow heavy thick lip resists ultra-high static pressure hydraulic oil swelling and long-term ultra-high temperature thermal oxidation aging; modified HNBR auxiliary heavy thick medium sealing rings resist ultra-low temperature severe embrittlement and hardening; double-layer heavy thick electro-galvanized stainless steel skeletons avoid dense high-temperature oil mist and engine metal friction abrasive dust permanent corrosion deformation; hybrid fiber PA66 heavy thick back-up rings prevent irreversible medium narrow lip tiny rotary extrusion damage under pressure spikes; all matched heavy thick accessories jointly resist long-cycle thermal aging, tiny dense oil mist particle slight abrasion and long-term ultra-high static pressure hydraulic oil corrosion after millions of ultra-high speed unidirectional rotary alternating temperature cycles, realizing year-round stable zero main pump hydraulic oil trace leakage at miniature input shaft medium narrow gap and zero external dense high-temperature oil mist dust entering main pump precision plunger and thin ultra-high speed support bearing inner cavity. The five-lip layered dense oil mist wiper buffer structure can absorb instantaneous ultra-high static hydraulic pressure surge pulses during cold engine startup, block tiny metal pump plunger and thin ultra-high speed bearing wear debris from adhering to medium narrow heavy thick sealing lip surface, and effectively reduce abnormal continuous faint trace main pump hydraulic oil leakage and main pump internal slight plunger scoring abrasion faults caused by early medium heavy thick seal aging and functional failure.

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