07011-00050 0701100050 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Transmission Oil Cooler Flow Valve Complete Overhaul Servicing GD30-4

1. Quick Details of  seal 07011-00050:

2. 07011-00050  picture:

3. Service part number :

4. FAQ

Q: Which Komatsu medium and heavy crawler bulldozer models can this 07011-00050 oil seal kit match, and what complete set of sealing spare parts are fully packed inside this overhaul service package?
A: This dedicated oil cooler flow valve oil seal repair kit is OEM customized for Komatsu D65EX-16, D85EX-18, D155AX-8 crawler bulldozers, exclusively matched with the transmission built-in oil cooler flow control valve. This core valve dynamically distributes transmission oil flow to the radiator cooler according to hydraulic oil real-time temperature, limits excessive cold oil flow in low-temperature winter startup to avoid transmission viscosity loss, and increases cooling flow automatically under high-temperature heavy pushing load to prevent transmission oil overheating and clutch burning. The kit contains all full-set sealing components required for one complete valve disassembly and overhaul, including double-lip HNBR cooler flow shuttle spool dynamic oil seals, dual balanced temperature feedback piston pressure seals, flat rectangular PU temperature-induced flow 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 classified by assembly positions, so maintenance technicians do not need to source scattered oil cooler flow valve seals from multiple suppliers, greatly cutting equipment downtime on mountain land grading, open-pit mine stripping and large-scale all-season land reclamation construction sites.

Q: What exclusive performance advantages does the four-material composite formula bring to bulldozer transmission oil cooler flow valve sealing compared with ordinary single NBR oil seal kits?
A: The bulldozer transmission oil cooler flow control valve operates under full-season temperature-variable cyclic pressure fluctuations all day long, enduring alternating cold low-flow and hot high-flow bidirectional pressure surges triggered by temperature changes, long-term full immersion in transmission oil mixed with metal friction debris, and year-round erosion of water vapor and fine sludge penetrating into the closed transmission valve cavity. HNBR main cooler flow spool and piston seals possess far superior low-temperature flexibility and anti-temperature alternating pressure hydraulic oil aging performance compared with ordinary NBR rubber; they will not harden, crack or lose uniform radial pre-tightening elasticity under freezing plateau winter cold startup and high-temperature summer heavy-load pushing dual extreme working environments. Flat rectangular PU buffer rings absorb instantaneous bidirectional pressure surge spikes generated by automatic cooling flow switching with temperature rise and fall, avoiding symmetrical bidirectional cyclic fatigue cracking and micro eccentric abrasion damage to double-lip spool sealing lips after millions of temperature feedback adjustment cycles. FKM thick static O-rings maintain consistent long-term static sealing tightness under both low-temperature high-viscosity and high-temperature thin-viscosity transmission oil circulation during uninterrupted all-day pushing work. Carbon-filled PTFE medium-gap backup rings deliver balanced bidirectional cold-hot wear resistance and medium-clearance anti-extrusion capacity, effectively preventing the main spool seal from being extruded into moderate clearance gaps between cooler flow shuttle spool and valve body under hot high-flow peak pressure. The four materials build a full-season temperature self-adaptive cooling anti-impact multi-layer interlocking transmission protection sealing system, raising the overall service lifespan of this oil seal kit by over 58% compared with traditional single-rubber oil seal kits.

Q: What clear color and structural visual differences allow maintenance technicians to quickly identify each precision component inside this transmission oil cooler flow control valve oil seal kit?
A: HNBR cooler flow shuttle spool and balance piston main seals are matte jet black with symmetrical double-lip bidirectional dynamic sealing structure, the contact lip surface adopts nano mirror precision polishing without micro burrs or frequent cold-hot flow switching cyclic abrasion scratches. Flat rectangular PU temperature-induced flow buffer rings are pale apricot yellow with exclusive flat rectangular shock absorption outline, which can be clearly distinguished from narrow rectangular, trapezoid rounded and curved oval PU buffer rings used on inching valves, lock-up clutch valves and speed shift 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 cold-hot alternating 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 with two layers of scraping lips; the outer layer intercepts large metal friction debris mixed in transmission oil, and the inner fine lip blocks tiny abrasive sludge particles from entering the bidirectional temperature feedback spool gap. Each accessory is printed with clear oil cooler flow control valve matching dimension marks on the surface for rapid sorting and matching during on-site transmission valve assembly.

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