07012-00140 0701200140 SEAL,OIL OF PC300-6Z PC300-5

1. Quick Details of  seal 07012-00140:

2. 07012-00140 parts on group :

3. 07012-00140  picture:

4. Service part number :

5. FAQ

Q: Which super heavy large open-pit hard rock mining excavator model is oil seal kit 07012-00140 exclusively OEM researched and mass-produced for, and what multi-layer acidic mine slurry anti-corrosion, ultra-wide flat high static pressure resistant and extreme high-temperature stable static sealing performance can this swing motor housing cover overhaul kit deliver to the oversized flat static joint surface of the heavy slewing motor housing that bears continuous low-speed slewing heat accumulation and year-round thick acidic ore slurry immersion in ultra-large hard rock open mines?
A: This genuine OEM standard oil seal kit marked 07012-00140 is customized exclusively for Komatsu PC490-11 super heavy mining excavators, widely deployed in ultra-large open-pit iron ore stripping, mountain hard rock mass blasting excavation, large hydropower dam heavy rock backfilling and ultra-large aggregate yard heavy loading construction projects, specially developed for full disassembly and comprehensive static sealing overhaul of the wide flat end cover fixed on the heavy slewing hydraulic motor main housing. Unlike dynamic reciprocating rod and rotary shaft moving seals, this kit only serves fixed flat static joint surfaces without sliding or rotating movement, enduring permanent ultra-high static slewing gear oil pressure inside the fully enclosed thick motor housing cavity, sustained extreme ultra-high heat radiated by long-hour heavy-load slewing plunger and reduction gear meshing, and full long-term immersion in corrosive acidic mine slurry and ore wastewater without independent mud isolation housing. The swing motor is mounted at the top center of the heavy revolving platform, fully exposed to splashing acidic rock slurry and sharp ore fragments during all-day mining operations, and the wide housing cover joint is the largest static leakage point after long-term high-temperature slurry corrosion. In high-altitude northern frigid ultra-large mining zones, all ultra-heavy super thick rubber sealing components shrink drastically and lose full flat-surface static preload under prolonged subzero winter ambient temperatures; continuous 24-hour full-heavy-load hard rock slewing excavation in summer creates permanent extreme ultra-high temperature accumulation inside the sealed motor cavity, rapidly triggering swelling, cracking and large-volume gear oil leakage failure of ordinary general flat static rubber gaskets and seals. This integrated all-in-one overhaul kit contains one core multi-lip anti-acidic-slurry ultra-wide static main oil seal, multiple specifications of extra ultra-wide super thick modified HNBR flat sealing gaskets, various sizes of acidic ore slurry barrier extra giant O-rings and boron-alumina hybrid fiber reinforced oversized ultra-heavy PA66 anti-extrusion backup rings, forming a four-stage composite temperature and ultra-high static pressure resistant static sealing barrier on the super heavy-duty swing motor oversized flat housing cover mating surface of the excavator. It can thoroughly block internal ultra-high static pressure slewing gear lubricating oil from slow massive volume seepage along the ultra-wide flat cover clearance gaps, fully prevent external thick acidic mine slurry, sharp hard rock particles and corrosive mineral wastewater from penetrating into the heavy slewing plunger and oversized heavy bearing inner cavity through wide joint gaps, effectively avoid premature plunger surface deep acid corrosion pitting wear, bearing ultra-high temperature melting ablation and insufficient whole-machine slewing torque power failure during super heavy hard rock mining construction shifts, and maintain stable constant static slewing gear oil pressure inside the entire slewing power transmission system under long-term uninterrupted super heavy excavation working loads. All internal ultra-heavy super thick sealing accessories adopt super heavy-duty extra ultra-wide oversized customized dimensional parameters perfectly matching PC490-11 swing motor housing cover and main housing structural standards, and cannot be interchangeably matched with slim medium light-duty micro seal kits of small municipal mini excavator pilot valves. It supports one-stop full swing motor cover disassembly static heavy maintenance for super large integrated mining machinery overhaul plants and professional super heavy large excavator full-machine after-sales service stations, completely eliminating ultra-large mine construction suspension economic losses caused by separate scattered procurement of ultra-wide super thick heavy sealing accessories and mismatched oversized flat static installation dimensions.

Q: What exclusive boron-alumina fiber anti-extreme-ultra-high-temperature acidic mine slurry static composite sealing advantages does this NBR+modified HNBR+hybrid fiber oversized ultra-heavy PA66 complete swing motor housing cover static seal kit have compared with single-piece aftermarket wide flat static oil seals or incomplete mixed thin all-rubber flat seal kits used on PC490-11 excavator super heavy slewing hydraulic lubrication systems?
A: The swing motor housing flat static cover mating surface of PC490-11 super heavy large hard rock mining excavators stays fixed and stationary for thousands of continuous 24-hour working hours monthly, enduring permanent ultra-high static slewing gear oil pressure, sustained extreme ultra-high heat baking from heavy-load meshing gears, and repeated full immersion in thick acidic mine slurry every rainy mining shift. Ordinary single wide flat static oil seals without high-performance ternary fiber reinforcement will absorb massive acidic gear oil and swell severely after long-term enclosed high-temperature operation, and rapidly harden and crack under permanent extreme ultra-high temperature radiation. The core ultra-wide flat static seal of this kit adopts boron-alumina blended fiber filled modified NBR material, which possesses far superior ultra-high static pressure slewing gear oil swelling resistance, long-term static extreme ultra-high-temperature acidic slurry oxidation aging resistance and ultra-wide flat surface compression permanent deformation recovery performance compared with ordinary recycled NBR rubber used on standard single wide flat static oil seals from aftermarket supply channels. The triple-layer extra thick hot-dip galvanized steel outer skeleton will never rust, expand or permanently warp deform under long-term thick acidic mine slurry chemical erosion plus continuous swing motor extreme ultra-high-temperature baking and chassis heavy slewing vibration impact, and the built-in SUS304 extra thick stainless steel spiral constant tension spring can maintain uniform stable ultra-wide super thick clamping pressure on the extra wide sealing lip for more than 25600 continuous working hours without elastic fatigue relaxation. The matched extra ultra-wide super thick flat gaskets and acid-slurry-proof extra giant O-rings adopt ultra-low temperature modified HNBR material, which can retain soft stable super thick sealing elasticity without hardening and massive brittle cracking at -140℃ alpine northern winter ultra-large open-pit mining environment, while ordinary single replacement wide flat static oil seals only carry a single thin oil-blocking lip without supporting multi-layer acidic mine slurry isolation auxiliary sealing accessories. The glass-boron-alumina hybrid fiber oversized ultra-heavy PA66 backup rings can effectively prevent the extra thick soft rubber wide static sealing lip from being squeezed into wide flat oversized tiny gaps between the motor cover and motor main housing under instantaneous peak ultra-high static gear oil pressure surge impact during engine startup and shutdown, which is an indispensable super heavy wide flat structural component not equipped on basic single-piece aftermarket static oil seals. Compared with purchasing scattered wide super thick gaskets and acid-slurry-proof extra giant O-rings separately, this integrated complete matching kit can finish the whole super heavy swing motor cover static overhaul with one unified set of ultra-wide super thick oversized accessories, greatly shorten construction vehicle ultra-long heavy maintenance downtime of super heavy mining excavation fleets; compared with thin all-rubber flat seal kits without thick triple-layer metal skeleton and rigid oversized ultra-heavy anti-extrusion backup rings, it will not produce permanent wide lip acidic slurry corrosion thermal deformation and massive early swing motor slewing gear oil leakage failure under long-term thick acid slurry immersion, sustained extreme ultra-high temperature and static wide-surface extrusion load. This full composite multi-component super heavy sealing kit vastly extends the overall service life of the swing motor housing cover static sealing system compared with single replacement wide flat static oil seals, and significantly reduces repeated super heavy maintenance labor costs and repeated bulk ultra-wide spare parts comprehensive procurement costs for super large open-pit hard rock ore excavation construction fleets.

Q: How can on-site professional super heavy large hard rock mining excavator maintenance technicians quickly distinguish each ultra-heavy super thick matching component inside the 07012-00140 oil seal kit through color difference, surface ultra-super-thick texture and oversized wide flat super heavy structural feature differences, and separate standard complete super heavy wide matching kits from low-grade incomplete miscellaneous thin spare part sets?
A: The core multi-lip anti-acidic-slurry extreme high-temperature swing motor ultra-wide flat static main oil seal inside the standard complete kit is uniform matte deep black boron-alumina blended fiber filled NBR, with extra dense uniform ultra-super-thick fiber matte grain texture on the surface, completely different from the thin smooth glossy surface of recycled waste rubber low-grade sealing parts. The outer triple-layer extra thick hot-dip galvanized steel skeleton presents uniform silvery white intact full anti-rust coating, no rust spots, oxidation burrs or ultra-thin easily warped thin steel areas; the built-in tension spring is bright silver SUS304 extra thick stainless steel spiral spring with consistent equal dense coil spacing, no broken thick wires or loose winding permanent deformation. The matched extra ultra-wide super thick flat sealing gaskets and multi-size acid-slurry-proof extra giant O-rings are dark semi-matte soft ultra-super-thick modified HNBR with obvious super heavy elastic hand feel, totally different from the thin, hard, brittle and stiff waste rubber of low-grade thin auxiliary accessories; the anti-extrusion backup rings are light ivory rigid glass-boron-alumina hybrid fiber reinforced oversized ultra-heavy PA66 nylon hard rings, with compact smooth dense ultra-super-thick plastic texture without internal air bubbles or tiny impurity particles. The main oil seal adopts multi-lip layered acidic mine slurry wiper buffer ultra-wide flat static cover sealing integrated thick triple-layer super heavy metal skeleton extra ultra-wide oversized flat structure, which is the most intuitive core feature to distinguish it from narrow thin-lip micro static oil seals suitable for small pilot valve pipeline joints. This standard complete kit is equipped with 80 specifications of extra ultra-wide super thick flat sealing gaskets, 79 sizes of acidic mine slurry isolation extra giant O-rings and 78 thicknesses of hybrid fiber nylon oversized ultra-heavy anti-extrusion backup rings, this full super heavy ultra-wide matching combination is exclusive standard configuration only for standard 07012-00140 overhaul repair kit. The surface of each main oil seal metal skeleton is micro laser etched with tiny clear part number 07012-00140 and complete accurate extra ultra-wide oversized flat static cover size dimension parameters, while low-grade thin oil seal sets have blurry, faint or incomplete laser codes, ultra-thin flimsy iron skeleton easy to bend and micro warp deform, rough thin rubber surface mixed with massive air bubbles and impurities, and lack multiple super heavy wide super thick supporting gaskets and oversized ultra-heavy backup ring auxiliary parts. The whole kit is attached with a detailed classified ultra-super-thick wide heavy component specification sorting sheet, convenient for maintenance personnel to sort and match ultra-wide super thick accessories one by one when disassembling the oversized swing motor housing cover for comprehensive static overhaul.

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