07011-00040 0701100040 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Transmission Auxiliary Pressure Compensation Valve Complete Overhaul Servicing SK04-1

1. Quick Details of  seal 07011-00040:

2. 07011-00040  parts on group :

3. 07011-00040 picture:

4. Service part number :

5. FAQ

Q: Which Komatsu medium and heavy crawler bulldozer models can this 07011-00040 oil seal kit match, and what complete set of sealing spare parts are fully packed inside this overhaul service package?
A: This dedicated auxiliary pressure compensation 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 auxiliary pressure compensation control valve. This auxiliary valve supplements system pressure automatically when the main pressure supply is insufficient under ultra-heavy pushing loads, eliminates traction attenuation during deep soil cutting and steep hill climbing, stabilizes the output pressure of clutch and steering circuits simultaneously, and avoids power drop caused by pressure loss of the main pressure regulating valve. The kit contains all full-set sealing components required for one complete valve disassembly and overhaul, including double-lip HNBR auxiliary compensation shuttle spool dynamic oil seals, dual balanced pressure compensation feedback piston pressure seals, wide curved oval PU auxiliary pressure fluctuation 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 auxiliary compensation valve seals from multiple suppliers, greatly cutting equipment downtime on mountain land grading, open-pit mine stripping and large-scale land reclamation construction sites.

Q: What exclusive performance advantages does the four-material composite formula bring to bulldozer transmission auxiliary pressure compensation valve sealing compared with ordinary single NBR oil seal kits?
A: The bulldozer transmission auxiliary pressure compensation control valve only activates under ultra-heavy overload working conditions, and stays in standby low-pressure state under light load, operating under extreme alternating high-low pressure cyclic fluctuations all day long, enduring instantaneous ultra-high pressure surge shocks triggered by sudden overload deep cutting, long-term 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 compensation spool and piston seals possess far superior low-temperature flexibility and anti-alternating high-low 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 frequent cold-start overload climbing operations. Wide curved oval PU buffer rings absorb instantaneous ultra-high pressure surge spikes generated by sudden heavy load compensation activation, avoiding one-way cyclic fatigue cracking and unilateral micro eccentric abrasion damage to double-lip spool sealing lips after millions of overload compensation adjustment cycles. FKM thick static O-rings maintain consistent long-term 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 overload wear resistance and medium-clearance anti-extrusion capacity, effectively preventing the main spool seal from being extruded into moderate clearance gaps between auxiliary compensation shuttle spool and valve body under overload peak pressure. The four materials build an alternating high-low pressure overload compensation anti-impact multi-layer interlocking power stabilization sealing protection system, raising the overall service lifespan of this oil seal kit by over 54% 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 auxiliary pressure compensation valve oil seal kit?
A: HNBR auxiliary compensation 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 overload compensation cyclic abrasion scratches. Wide curved oval PU auxiliary pressure fluctuation buffer rings are pale apricot yellow with exclusive wide curved oval shock absorption outline, which can be clearly distinguished from narrow curved oval, oval curved and flat arched PU buffer rings used on priority flow valves, load sensing valves and flow distribution 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 alternating high-low pressure 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 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 spool gap. Each accessory is printed with clear auxiliary pressure compensation control valve matching dimension marks on the surface for rapid sorting and matching during on-site transmission valve assembly.

6. Exhibition and Wearhous

Oil seals,Hydraulic Seals, Cylinders Seal Kits, And More