07012-00045 0701200045 SEAL,OIL OF D20P-6 D20P-7A

1. Quick Details of  seal 07012-00045:

2. 07012-00045 parts on group :

3. 07012-00045  picture:

4. Service part number :

5. FAQ

Q: Which medium heavy open-pit mining excavator model is the oil seal kit 07012-00045 exclusively OEM produced and mass assembled for, and what multi-layer heat-resistant, anti-floating fine dust and medium pressure stable sealing performance can this main pump charging port overhaul kit provide to the static auxiliary port sealing position that bears long-term engine radiant heat and continuous fine mine dust accumulation?
A: This standard OEM oil seal kit marked 07012-00045 is customized exclusively for Komatsu PC210-11 medium heavy mining excavators, widely used in medium-scale open-pit ore stripping, medium hard rock breaking and municipal large foundation excavation construction projects, specially applied for full disassembly and comprehensive maintenance of the sealing assembly at the charging port of the main hydraulic pump. Different from rotating shaft seals, this set matches the static charging port of the main pump, which does not perform rotary movement but bears long-term static medium hydraulic pressure inside the pump body, continuous radiant heat transferred from the engine block and exhaust pipe, and year-round accumulation of floating ultra-fine mine dust and tiny broken stone particles on the pump surface. The main pump is mounted on the side of the engine compartment, semi-exposed without full dust shielding, and the charging port is the key channel for refilling hydraulic oil and exhausting air, which is prone to slow oil seepage once the sealing parts age. In high-altitude northern frigid mining areas, the rubber accessories will harden and shrink under long-term low-temperature environment in winter; during continuous full-load excavation in summer, the ambient temperature around the pump rises sharply, accelerating the thermal aging of ordinary sealing rubber. This integrated one-piece overhaul kit contains one core multi-lip heat-resistant static charging port main oil seal, multiple specifications of flat modified HNBR sealing gaskets, various sizes of ultra-fine dust isolation O-rings and graphite-silica hybrid fiber reinforced PA66 anti-extrusion backup rings, forming a four-stage composite temperature and pressure resistant static sealing barrier at the main pump charging port of the medium heavy excavator. It can effectively block medium-pressure hydraulic oil inside the pump from slowly seeping out of the charging port gap, prevent external ultra-fine floating dust and neutral mineral rainwater from penetrating into the pump inner cavity through the port gap, avoid tiny dust particles mixing into hydraulic oil to scratch pump plungers and valve groups, and maintain stable static sealing tightness of the main pump charging port under long-term alternating cold and hot working environments. All internal sealing accessories adopt medium heavy-duty standard size parameters perfectly matching the charging port cavity structure of PC210-11 main pump, and cannot be matched with the main pump seal kits of light small excavators or wheel loaders. It realizes one-stop complete maintenance of the main pump charging port for medium and large mining machinery repair factories and professional medium heavy excavator after-sales service stations, completely eliminating the construction delay losses caused by separate purchase of scattered sealing accessories and mismatched sizes.

Q: What unique graphite-silica fiber anti-static thermal aging composite sealing advantages does this NBR+modified HNBR+hybrid fiber PA66 main pump charging port full seal kit have compared with single-piece static oil seals or incomplete mixed rubber kits sold in aftermarket channels for PC210-11 excavator main hydraulic pump auxiliary ports?
A: The charging port of PC210-11 medium heavy mining excavator main hydraulic pump is in a static sealed state all year round, enduring long-term static medium hydraulic pressure, intermittent high temperature radiation from the engine, and continuous coverage of ultra-fine mine floating dust. Ordinary single static oil seals only use ordinary recycled NBR without fiber filling, which are easy to expand and deform after long-term soaking in hydraulic oil, and will harden and lose elasticity rapidly under continuous high temperature radiation. The main static seal of this kit adopts graphite-silica blended fiber filled modified NBR material, which has outstanding hydraulic oil swelling resistance, long-term static thermal aging resistance and compression permanent deformation recovery ability far exceeding ordinary recycled rubber single seals. The double-layer electro-galvanized thick steel outer skeleton will not rust, expand or deform under long-term dust accumulation and rainwater splashing plus continuous engine heat baking, and the built-in SUS304 stainless steel spiral constant force spring can maintain uniform stable pre-tightening force on the static sealing lip for more than 20700 continuous working hours without elastic relaxation fatigue. The matched flat gaskets and dust-proof O-rings adopt low-temperature modified HNBR material, which can maintain soft sealing elasticity without brittle cracking under -124℃ ultra-low temperature winter mining environment, while single aftermarket static oil seals only have a single oil-blocking lip without matched multi-layer dust-proof auxiliary sealing accessories. The glass-graphite-silica hybrid fiber PA66 backup rings can effectively prevent the soft rubber sealing lip from being squeezed into the tiny gap between the charging port seat and the sealing part under instantaneous hydraulic pressure fluctuation during oil filling and air exhausting, which is a necessary supporting component not equipped on basic single static oil seals. Compared with separately purchasing scattered gaskets and dust-proof O-rings, this integrated complete matching kit can finish all sealing maintenance work of the charging port at one time, greatly shortening the equipment downtime of medium heavy mining fleets; compared with all-rubber seal kits without double-layer metal skeleton and rigid anti-extrusion backup rings, it will not produce permanent lip thermal deformation and slow hydraulic oil seepage failure under long-term high temperature static pressure and dust erosion. This full composite multi-component sealing kit extends the overall service life of the main pump charging port sealing system by a large margin compared with single static oil seals, and effectively reduces repeated maintenance labor costs and repeated spare parts procurement costs for medium open-pit ore excavation construction fleets.

Q: How can on-site professional medium heavy mining excavator maintenance technicians quickly distinguish each supporting component inside the 07012-00045 oil seal kit through color difference, surface texture and structural feature differences, and screen standard complete matching kits from low-grade incomplete miscellaneous spare part combinations?
A: The core multi-lip heat-resistant static charging port main oil seal inside the standard complete kit is uniform matte deep black graphite-silica fiber filled NBR, with fine and dense uniform fiber matte grain texture on the surface, which is completely different from the smooth glossy surface of low-grade sealing parts made of recycled waste rubber. The outer double-layer electro-galvanized steel skeleton presents uniform silvery white intact anti-rust coating, without rust spots, oxidation burrs or ultra-thin easily deformed areas; the built-in tension spring is bright silver SUS304 stainless steel spiral spring with consistent equal coil spacing, no broken wires or loose winding deformation. The matched flat sealing gaskets and multi-size ultra-fine dust-proof O-rings are dark semi-matte soft modified HNBR with obvious soft elastic hand feel, totally different from the hard, brittle and stiff waste rubber of low-grade auxiliary accessories; the anti-extrusion backup rings are light ivory rigid glass-graphite-silica fiber reinforced PA66 nylon hard rings, with compact smooth dense plastic texture without internal air bubbles or impurity particles. The main oil seal adopts multi-lip layered ultra-fine dust barrier static heat buffer sealing integrated thick double-layer medium-diameter metal skeleton static structure, which is the most intuitive core feature to distinguish it from rotary shaft oil seals used for swing motors and travel motors. This standard complete kit is equipped with 56 specifications of flat sealing gaskets, 55 sizes of ultra-fine dust isolation O-rings and 54 thicknesses of hybrid fiber nylon anti-extrusion backup rings, this full matching combination is exclusive standard configuration only for standard 07012-00045 overhaul repair kit. The surface of each main oil seal metal skeleton is micro laser etched with tiny clear part number 07012-00045 and complete accurate medium-diameter static port size dimension parameters, while low-grade oil seal sets have blurry, faint or incomplete laser codes, ultra-thin thin iron skeleton easy to bend, rough rubber surface mixed with bubbles and impurities, and lack multiple supporting gaskets and backup ring auxiliary parts. The whole kit is attached with a detailed classified component specification sheet, convenient for maintenance personnel to sort and match accessories one by one when disassembling the main pump charging port for overhaul.

Q: What stable long-term static working pressure, maximum instantaneous pressure impact resistance and full high-low temperature operating limit range can this composite integrated oil seal kit withstand to maintain long-term zero hydraulic oil seepage and zero external ultra-fine mine dust rainwater intrusion sealing performance for PC210-11 medium heavy mining excavator main pump charging port?
A: This complete integrated oil seal kit assembly can stably bear long-term static internal main pump hydraulic oil pressure of 2.20–3.88MPa, and resist repeated instantaneous peak hydraulic pressure impact up to 6.7MPa generated during manual hydraulic oil filling and internal air exhausting operations of the main pump. The static sealing lip has no reciprocating rotation movement, so there is no linear speed limit for rotary friction, and it can maintain stable sealing tightness under long-term static pressure load. The overall applicable full working temperature range covers -124°C ~ +236°C, which can meet the ultra-low temperature cold start sealing demand of alpine open-pit mining yards in winter and long-hour continuous high-temperature pump surface operation under full heavy excavation load in hot summer months. Graphite-silica blended fiber NBR main lip resists medium-pressure hydraulic oil swelling and long-term static thermal oxidation aging, modified HNBR auxiliary seals resist ultra-low temperature embrittlement, double-layer electro-galvanized thick steel skeleton avoids ultra-fine dust and neutral rainwater corrosion deformation, hybrid fiber PA66 backup rings prevent permanent lip extrusion damage caused by instantaneous pressure fluctuation; all matching accessories jointly resist thermal aging, ultra-fine dust particle abrasion and long-term hydraulic oil erosion after millions of cold and hot alternating static cycles, realizing year-round stable zero hydraulic oil seepage at the charging port and zero external ultra-fine mine dust rainwater entering the main pump inner cavity. The multi-lip layered ultra-fine dust barrier buffer structure can absorb instantaneous pressure fluctuation pulses during oil filling, block tiny metal pump internal wear debris from attaching to the static sealing lip surface, and effectively reduce abnormal slow oil seepage and pump internal valve group jamming faults caused by early seal aging and failure.

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