07012-00068 0701200068 SEAL,OIL OF SK07-2 WA320-1

1. Quick Details of  seal 07012-00068:

2. 07012-00068 parts on group :

3. 07012-00068  picture:

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5. FAQ

Q: Which heavy open-pit mining excavator model is oil seal kit 07012-00068 exclusively OEM engineered and mass-produced for, and what multi-layer high-temperature oxidation resistant, heavy thick mud barrier and high-viscosity gear oil resistant static sealing performance can this travel gear cover overhaul kit provide to the large static gearbox cover sealing surface that bears continuous gear operation heat radiation and long-term full immersion in open-pit thick mud puddles?
A: This genuine OEM standard oil seal kit marked 07012-00068 is tailor-made exclusively for Komatsu PC350-11 heavy mining excavators, widely deployed in large open-pit bulk ore stripping, hard rock blasting excavation and large bridge foundation heavy construction projects, specially used for full disassembly and comprehensive overhaul of the static sealing assembly installed on the outer cover of each travel reduction gearbox. Unlike rotary shaft and reciprocating rod seals, this set fits the large flat static mating surface of the gearbox end cover, without sliding or rotary movement, enduring long-term static high-viscosity gear lubricating oil pressure inside the reduction box, continuous radiant heat generated by high-speed planetary gear operation, and year-round full immersion in thick sticky mine mud and weakly alkaline mine wastewater during rainy open-pit construction. Each travel reduction gearbox is mounted at the bottom of the crawler frame, completely exposed to rugged muddy terrain with no complete protective shell, and the cover sealing surface is the primary position for gear oil leakage after long-term heat aging and mud corrosion. In high-altitude northern frigid mining zones, all thick rubber sealing components shrink severely and lose full sealing preload under long-term subzero winter temperatures; continuous 24-hour full-load muddy road traveling in summer creates persistent high heat accumulation inside the sealed gearbox cavity, which rapidly degrades ordinary low-performance static rubber gaskets and seals. This integrated all-in-one overhaul kit contains one core multi-lip anti-high-temperature oxidation static main oil seal, multiple specifications of wide flat modified HNBR sealing gaskets, various sizes of heavy thick mud barrier large O-rings and alumina-zirconia hybrid fiber reinforced thick PA66 anti-extrusion backup rings, forming a four-stage composite temperature and high-viscosity oil resistant static sealing barrier on the heavy-duty travel reduction gear large flat cover static mating surface of the excavator. It can thoroughly block internal high-viscosity travel reduction gear lubricating oil from slowly seeping out along the wide gear cover clearance, fully prevent external thick sticky mine mud, large rock silt particles and corrosive alkaline mine wastewater from penetrating into the planetary gear and heavy bearing inner cavity through cover gaps, effectively avoid premature gear tooth surface heavy abrasive wear, bearing high-temperature melting ablation and insufficient crawler travel torque failure during heavy bulk ore mining construction, and maintain stable constant static lubrication pressure inside the entire crawler travel reduction gear system under long-term uninterrupted heavy mining excavation loads. All internal heavy sealing accessories adopt heavy-duty extra-thickened large-diameter wide customized dimensional parameters perfectly matching PC350-11 travel reduction gearbox cover and housing structural standards, and cannot be interchangeably assembled with slim light-duty seal kits of small municipal excavators or wheel loaders. It supports one-stop full travel reduction gear cover disassembly maintenance for large integrated mining machinery overhaul plants and professional heavy excavator after-sales service stations, completely eliminating large mine construction suspension economic losses caused by separate procurement of scattered heavy sealing parts and mismatched wide flat installation dimensions.

Q: What exclusive alumina-zirconia fiber anti-long-term static high-temperature mud corrosion composite sealing advantages does this NBR+modified HNBR+hybrid fiber thick PA66 complete travel gear cover static seal kit have compared with single-piece aftermarket wide static oil seals or incomplete mixed thin all-rubber seal kits used on PC350-11 excavator heavy crawler travel reduction gear lubrication systems?
A: The travel reduction gearbox cover static mating surface of PC350-11 heavy mining excavators remains fixed and stationary for thousands of working hours each month, enduring continuous static high-viscosity gear oil pressure, sustained high-temperature heat radiation from high-speed meshing planetary gears, and repeated full immersion in thick alkaline mine mud every muddy construction shift. Ordinary single wide static oil seals without high-performance fiber filling will absorb large amounts of high-viscosity gear oil and swell severely after long-term operation, and quickly harden and crack under persistent gearbox heat radiation. The main wide static seal of this kit adopts alumina-zirconia blended fiber filled modified NBR material, which possesses far superior high-viscosity gear oil swelling resistance, long-term static high-temperature oxidation aging resistance and wide-surface compression permanent deformation recovery performance compared with ordinary recycled NBR rubber used on standard single wide static oil seals from aftermarket supply channels. The triple-layer electro-galvanized thick steel outer skeleton will never rust, expand or permanently deform under long-term thick muddy alkaline mine water erosion plus continuous gearbox high-temperature baking and crawler heavy vibration impact, and the built-in SUS304 stainless steel spiral constant force spring can maintain uniform stable ultra-wide clamping pressure on the extra thick wide sealing lip for more than 22600 continuous working hours without elastic fatigue relaxation. The matched wide flat gaskets and heavy mud-proof large O-rings adopt ultra-low temperature modified HNBR material, which can retain soft stable thick sealing elasticity without hardening and brittle cracking at -132℃ alpine northern winter open-pit mining environment, while ordinary single replacement wide static oil seals only have a single thin oil-blocking lip without supporting multi-layer heavy thick mud isolation auxiliary sealing accessories. The glass-alumina-zirconia hybrid fiber thick PA66 backup rings can effectively prevent the extra thick soft rubber wide sealing lip from being squeezed into wide flat tiny gaps between the gear cover and gearbox housing under instantaneous peak gear oil pressure surge impact during startup and shutdown, which is an indispensable heavy wide structural component not equipped on basic single-piece aftermarket static oil seals. Compared with purchasing scattered wide gaskets and mud-proof large O-rings separately, this integrated complete matching kit can finish the whole heavy travel reduction gear cover overhaul with one set of thick wide accessories, greatly shorten construction vehicle long maintenance downtime of heavy mining excavation fleets; compared with thin all-rubber seal kits without thick triple-layer metal skeleton and rigid thick anti-extrusion backup rings, it will not produce permanent wide lip mud abrasion thermal deformation and massive early travel gear oil leakage failure under long-term thick mud erosion, sustained high temperature and static wide-surface extrusion load. This full composite multi-component heavy sealing kit extends the overall service life of the travel reduction gear cover static sealing system by a huge margin compared with single replacement wide static oil seals, and significantly reduces repeated heavy maintenance labor costs and repeated bulk spare parts comprehensive procurement costs for large open-pit mine bulk ore excavation construction fleets.

Q: How can on-site professional heavy mining excavator maintenance technicians quickly distinguish each heavy matching component inside the 07012-00068 oil seal kit through color difference, surface texture and wide structural feature differences, and separate standard complete heavy matching kits from low-grade incomplete miscellaneous thin spare part sets?
A: The core multi-lip anti-high-temperature heavy mud travel gear cover wide static main oil seal inside the standard complete kit is uniform matte deep black alumina-zirconia blended fiber filled NBR, with extra dense uniform 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 electro-galvanized steel skeleton presents uniform silvery white intact full anti-rust coating, no rust spots, oxidation burrs or ultra-thin easily deformed thin steel areas; the built-in tension spring is bright silver SUS304 stainless steel spiral spring with consistent equal dense coil spacing, no broken wires or loose winding deformation. The matched wide flat sealing gaskets and multi-size heavy mud-proof large O-rings are dark semi-matte soft thick modified HNBR with obvious 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-alumina-zirconia hybrid fiber reinforced thick PA66 nylon hard rings, with compact smooth dense thick plastic texture without internal air bubbles or impurity particles. The main oil seal adopts multi-lip layered heavy thick mud wiper buffer wide flat static cover sealing integrated thick triple-layer heavy metal skeleton extra-wide large-diameter structure, which is the most intuitive core feature to distinguish it from narrow thin-lip light-duty static oil seals suitable for small pilot valve joints. This standard complete kit is equipped with 65 specifications of wide flat sealing gaskets, 64 sizes of heavy thick mud isolation large O-rings and 63 thicknesses of hybrid fiber nylon thick anti-extrusion backup rings, this full heavy wide matching combination is exclusive standard configuration only for standard 07012-00068 overhaul repair kit. The surface of each main oil seal metal skeleton is micro laser etched with tiny clear part number 07012-00068 and complete accurate extra-wide large-diameter flat static cover size dimension parameters, while low-grade thin oil seal sets have blurry, faint or incomplete laser codes, ultra-thin thin iron skeleton easy to bend and deform, rough thin rubber surface mixed with massive air bubbles and impurities, and lack multiple heavy wide supporting gaskets and thick backup ring auxiliary parts. The whole kit is attached with a detailed classified heavy wide component specification sheet, convenient for maintenance personnel to sort and match thick wide accessories one by one when disassembling the travel reduction gearbox cover for overhaul.

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