07011-00058 0701100058 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Transmission Brake Charge Valve Complete Overhaul Servicing D20A-7

1. Quick Details of  seal 07011-00058:

2. 07011-00058  parts on group :

3. 07011-00058  picture:

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5. FAQ

Q: Which Komatsu medium and heavy crawler bulldozer models can this 07011-00058 oil seal kit match, and what full set of sealing spare parts are fully packed inside this overhaul service package?
A: This dedicated brake charge pressure valve oil seal repair kit is OEM customized for Komatsu D65EX-16, D85EX-18, D155AX-8 crawler bulldozers, exclusively matched with the built-in transmission brake charge pressure control valve. This core valve independently supplies stable pre-charged hydraulic pressure to the service brake and parking brake circuits, maintains constant brake standby pressure at all driving speeds, eliminates brake response delay during emergency downhill braking, and ensures balanced left-right track braking force to avoid bulldozer sideslip on slippery muddy slopes. The kit contains all complete sealing components required for one-time full valve body disassembly and overhaul, including double-lip HNBR brake charge shuttle spool dynamic oil seals, dual balanced brake charge feedback piston pressure seals, narrow trapezoidal PU brake charge instantaneous 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 brake charge valve seals from multiple suppliers, greatly cutting equipment downtime on mountain slope excavation, open-pit mine haulage and wet muddy farmland leveling construction sites.

Q: What exclusive performance advantages does the four-material composite formula bring to bulldozer transmission brake charge valve sealing compared with ordinary single NBR oil seal kits?
A: The bulldozer transmission brake charge pressure control valve maintains constant standby high pressure all day long, only releasing pressure temporarily when brakes are fully engaged, enduring frequent instantaneous pressure relief surges triggered by frequent foot brake stepping, long-term full immersion in high-temperature 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 brake charge spool and piston seals possess far superior low-temperature flexibility and anti-long-term static high-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 construction with long-time downhill standby brake pressure storage. Narrow trapezoidal PU buffer rings absorb instantaneous pressure relief surge spikes generated by sudden emergency brake stepping, avoiding unidirectional cyclic fatigue lip thinning and unilateral micro eccentric abrasion damage to double-lip spool sealing lips after millions of brake on-off operation cycles. FKM thick static O-rings maintain consistent permanent static sealing tightness under prolonged high-temperature transmission oil circulation during uninterrupted all-day heavy pushing work. Carbon-filled PTFE medium-gap backup rings deliver balanced unilateral brake relief wear resistance and medium-clearance anti-extrusion capacity, effectively preventing the main spool seal from being extruded into moderate clearance gaps between brake charge shuttle spool and valve body under long-duration static brake peak pressure. The four materials build a long static brake pressure anti-emergency impact multi-layer interlocking safety braking sealing protection system, raising the overall service lifespan of this oil seal kit by over 60% 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 brake charge pressure control valve oil seal kit?
A: HNBR brake charge shuttle spool and balance piston main seals are matte jet black with asymmetrical double-lip unidirectional dynamic sealing structure, the contact lip surface adopts nano mirror precision polishing without micro burrs or frequent brake relief cyclic abrasion scratches. Narrow trapezoidal PU brake charge pressure buffer rings are pale apricot yellow with exclusive slim trapezoidal shock absorption outline, which can be clearly distinguished from narrow flat rectangular, flat rectangular and curved oval PU buffer rings used on torque converter pressure valves, oil cooler flow valves and inching 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 static high-pressure 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 unidirectional brake charge spool gap. Each accessory is printed with clear brake charge control valve matching dimension marks on the surface for rapid sorting and matching during on-site transmission valve assembly.

Q: What wide temperature range and long static standby brake pressure & instant brake relief impact hydraulic working conditions can this four-material composite oil seal kit sustain for long-term stable continuous operation?
A: This integrated oil seal kit can steadily bear sustained long-term static brake standby working pressure up to 465 bar, and withstand repeated instantaneous brake relief peak impact pressure up to 530 bar without extrusion failure of sealing components. HNBR and PU components retain stable elastic recovery and unidirectional brake cyclic sealing performance within -38°C ~ +122°C, fully adapting to sub-zero frozen mountain slope frequent emergency braking grading in winter and high-temperature continuous long-distance heavy pushing operation in summer. FKM thick O-rings can operate reliably within -26°C ~ +148°C, perfectly matching the ultra-high-temperature static-pressure transmission oil circulation state of non-stop open-pit mine haulage construction. Carbon-filled PTFE medium-gap backup rings will not soften or deform under millions of intermittent unidirectional spool sliding friction and persistent alternating cold-hot temperature changes, maintaining consistent anti-leakage protective performance through all seasonal construction environments.

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