07011-00075 0701100075 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Transmission Main Relief Safety Valve Complete Overhaul Servicing GD405A-2

1. Quick Details of  seal 07011-00075:

2. 07011-00075  parts on group :

3. 07011-00075  picture:

4. Service part number :

5. FAQ

Q: Which Komatsu heavy crawler bulldozer models fit this 07011-00075 oil seal kit, and what complete sealing components are contained in this full overhaul package?
A: This dedicated main relief safety valve oil seal repair kit is OEM matched for Komatsu D65EX-16, D85EX-18, D155AX-8 heavy crawler bulldozers, specially designed for the transmission built-in main relief safety control valve. This safety valve acts as the core pressure protection component of the whole transmission hydraulic system; when the bulldozer hits hard rock or suffers sudden overload resistance, it automatically opens to release excess high-pressure oil, prevents hydraulic pipelines, clutch assemblies and all control valves from bursting or deformation caused by overpressure, and restores normal working pressure immediately after overload disappears. The kit contains all sealing parts required for one full valve disassembly and maintenance without separate purchases, including double-lip HNBR main relief shuttle spool dynamic oil seals, dual balanced overload pressure feedback piston pressure seals, wide narrow trapezoidal PU overload relief surge buffer rings, carbon-filled PTFE medium-gap anti-extrusion backup rings, heat-resistant medium thick FKM static O-rings, medium-duty double-layer transmission oil isolation dust wiper and thickened anti-corrosion metal flat gaskets. All sealing accessories are sorted and sealed into independent labeled plastic bags divided by installation positions, so maintenance workers do not need to purchase scattered main relief valve seals from multiple suppliers, greatly cutting equipment downtime on hard rock quarry excavation, mountain road rock breaking and large mine stripping construction sites.

Q: What unique core performance advantages does this four-material composite sealing structure bring to bulldozer transmission main relief safety valve compared with ordinary single NBR oil seal kits?
A: The bulldozer transmission main relief safety control valve stays under medium steady standby pressure for most working hours, and will instantly bear ultra-high overload peak pressure when encountering hard obstacles, operating under extreme alternating medium-low standby pressure and ultra-high relief pressure cycles all day long. It suffers violent instantaneous pressure impact during overload relief, long-term full immersion in high-temperature transmission oil mixed with hard metal abrasive debris, and year-round erosion of condensed water vapor and rock fine sludge penetrating into the closed valve cavity. HNBR main relief spool and piston seals have far better low-temperature toughness and anti-violent overload pressure oil aging performance than ordinary NBR rubber; they will not harden, crack or lose uniform radial pre-tightening elasticity under freezing plateau winter construction with frequent sudden rock overload relief operations. Wide narrow trapezoidal PU buffer rings absorb violent ultra-high pressure surge spikes generated by instant overload pressure relief, avoiding one-way severe cyclic fatigue cracking and unilateral thick lip rapid abrasion damage to double-lip spool sealing lips after millions of hard rock overload relief cycles. FKM thick static O-rings maintain stable long-term static sealing tightness under prolonged high-temperature transmission oil circulation during non-stop all-day heavy rock pushing work. Carbon-filled PTFE medium-gap backup rings have strong unilateral overload impact wear resistance and medium-clearance anti-extrusion capacity, effectively preventing the main spool seal from being extruded into moderate clearance gaps between main relief shuttle spool and valve body under instant ultra-high relief peak pressure. The four materials build an anti-overpressure safety protection multi-layer interlocking overload buffer sealing system, lifting the overall service lifespan of this oil seal kit by over 66% compared with traditional single-rubber oil seal kits.

Q: What obvious color and structural appearance differences help maintenance technicians quickly distinguish each precision sealing part inside this transmission main relief safety valve oil seal kit?
A: HNBR main relief shuttle spool and balance piston main seals are matte jet black with asymmetrical double-lip unidirectional heavy-load dynamic sealing structure, the contact lip surface adopts ultra-fine nano mirror precision polishing without micro burrs or violent overload relief cyclic abrasion scratches. Wide narrow trapezoidal PU overload relief pressure buffer rings are pale apricot yellow with exclusive wide slim trapezoidal shock absorption outline, which can be clearly distinguished from narrow slim oval, wide flat oval and slim arched PU buffer rings used on brake pilot valves, travel steering combined valves and lubrication valves. FKM medium thick static O-rings are dark coffee brown with thick uniform circular cross-section, no shrinkage or permanent micro deformation after long-term medium standby / ultra-high relief alternating high-temperature oil soaking storage. Carbon-filled PTFE medium-gap anti-extrusion rings are off-white with evenly scattered tiny black carbon particles spread across the flat surface, easy to separate from light gray graphite-infused PTFE rings applied to narrow-gap miniature pilot valve assemblies. The medium-duty double-layer dust wiper ring is medium-thick black composite structure with two layers of scraping lips; the outer thick lip intercepts large hard metal friction debris mixed in transmission oil, and the inner fine lip blocks tiny rock abrasive sludge particles from entering the unidirectional overload relief spool gap. Each accessory is printed with clear main relief safety control valve matching dimension marks on the surface for fast sorting and matching during on-site heavy transmission valve assembly.

Q: What wide temperature range and medium standby pressure & instant ultra-high overload relief alternating cyclic pressure hydraulic working conditions can this four-material composite oil seal kit withstand for long-term stable continuous operation?
A: This integrated full oil seal kit can steadily bear sustained long-term medium standby working pressure up to 200 bar, and withstand repeated instantaneous hard rock overload relief ultra-high peak impact pressure up to 560 bar without extrusion failure or lip cracking of sealing components. HNBR and PU components retain stable elastic recovery and unidirectional heavy overload cyclic sealing performance within -38°C ~ +122°C, fully adapting to sub-zero frozen mountain rock excavation frequent sudden overload relief in winter and high-temperature continuous long-distance heavy rock pushing operation in summer. FKM thick O-rings can operate reliably within -26°C ~ +148°C, perfectly matching the ultra-high-temperature alternating pressure transmission oil circulation state of non-stop hard rock quarry construction. Carbon-filled PTFE medium-gap backup rings will not soften or deform under millions of intermittent unidirectional spool sliding friction and frequent large-range cold-hot temperature alternation, maintaining consistent anti-leakage safety protection performance through all seasonal rock construction environments.

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