K9003555 SEAL KIT OF DL500

1. Quick Details of  seal K9003555:

2. K9003555 parts on group :

3. K9003555  picture:

4. Service part number :

 
5. FAQ

Q: Which medium heavy road construction and medium open-pit excavator model is cylinder seal kit K9003555 exclusively OEM engineered and mass-produced for, and what multi-layer mixed mud-gravel isolation, medium heavy long-stroke reciprocating impact wear resistant and all-weather stable reciprocating sealing performance can this stick cylinder overhaul kit bring to the medium heavy long-stroke piston rod that bears continuous rock lifting, soil stacking loads and year-round muddy gravel splashing on highway construction and medium ore stripping sites?
A: This genuine OEM standard cylinder seal kit marked K9003555 is tailor-made for HD820 medium heavy excavators, widely used in highway subgrade excavation, bridge pier foundation construction, medium open-pit ore stripping and construction waste cleaning projects, specially developed for full disassembly and comprehensive heavy sealing overhaul of the sealing assembly mounted on the middle stick hydraulic cylinder piston rod. Different from boom heavy impact cylinder seals and lightweight mini travel motor rotary seals, this stick cylinder bears steady medium heavy load when extending and retracting the middle arm to lift soil and rock, its piston rod makes medium heavy long-stroke push-pull reciprocating movements every time adjusting arm outreach distance, withstands frequent instantaneous medium-high hydraulic pressure surges, and is exposed to mixed mud, broken gravel and weakly alkaline rainwater all year round at the middle arm hinge without full mud protective cover. The stick cylinder is installed at the middle section of the working arm and immersed in medium-high viscosity anti-wear hydraulic oil for long-term continuous operation. In northern alpine cold construction zones, all medium thick rubber sealing components shrink sharply under long-term subzero ambient temperatures and lose uniform medium heavy clamping force; all-day full-load construction in summer creates lasting medium-high temperature accumulation inside the narrow cylinder cavity, which accelerates mud infiltration, swelling and cracking leakage failure of ordinary generic reciprocating rubber seals. This integrated all-in-one overhaul kit contains one core multi-lip anti-mud-gravel medium heavy reciprocating main oil seal, multiple specifications of medium wide thick modified HNBR flat sealing gaskets, various sizes of mixed mud gravel barrier large O-rings and boron-silicon hybrid fiber reinforced medium thick oversized PA66 anti-extrusion backup rings, forming a four-stage composite temperature and medium-high dynamic pressure resistant reciprocating sealing barrier on the medium heavy-duty stick cylinder long-stroke medium-diameter piston rod of HD820 excavator. It can effectively block medium-high pressure working hydraulic oil from continuous trace leakage along piston rod clearance gaps, fully prevent external mixed mud, tiny gravel particles and weakly alkaline wastewater from scratching the ultra-smooth polished piston rod journal surface and invading the cylinder precision piston and thick sliding bus inner cavity, avoid premature bus surface heavy abrasive scoring, bearing medium-high temperature melting ablation and insufficient stick arm lifting power failure during medium heavy construction shifts, and maintain stable balanced medium-high hydraulic pressure inside the entire middle arm hydraulic system under long-term uninterrupted medium heavy excavation loads. All internal medium thick sealing accessories adopt medium heavy-duty medium-diameter customized sizes perfectly matching HD820 stick cylinder barrel and piston rod dimensional standards, and cannot be interchangeably matched with slim micro seal kits of small mini excavator pilot valves. It supports one-stop full stick cylinder disassembly heavy maintenance for medium-sized machinery repair factories and professional medium heavy excavator full-machine after-sales service stations, completely eliminating construction suspension economic losses caused by separate scattered procurement of matched heavy sealing accessories and mismatched cylinder installation dimensions.

Q: What exclusive boron-silicon fiber anti-medium-heavy long-stroke mixed mud-gravel reciprocating impact composite sealing advantages does this NBR+modified HNBR+hybrid fiber medium thick oversized PA66 complete stick arm cylinder seal kit have compared with single aftermarket medium heavy reciprocating oil seals or incomplete thin all-rubber mixed seal kits matched for HD820 excavator middle arm hydraulic working systems?
A: The stick arm hydraulic cylinder piston rod of HD820 medium heavy road construction and medium open-pit mining excavators completes thousands of medium heavy long-stroke reciprocating lifting cycles every working day during rock and soil handling, bears alternating instantaneous medium-high hydraulic impact pressure during load switching, accumulates tens of thousands of medium-temperature heavy vibration mixed reciprocating working hours monthly, stays fully immersed in easily oxidized medium-high viscosity hydraulic oil for a long time, and is continuously splashed by mixed mud and broken gravel on road and mine construction sites. The core piston rod main oil seal of this kit adopts boron-silicon blended fiber filled modified NBR material, which possesses far stronger medium-high dynamic pressure hydraulic oil swelling resistance, long-term medium heavy long-stroke mud-gravel reciprocating friction wear resistance and medium-high temperature compression permanent deformation recovery performance compared with ordinary recycled NBR rubber used on single loose medium heavy reciprocating oil seals from general aftermarket channels. The double-layer medium thick hot-dip galvanized steel outer skeleton will never rust, expand or permanently warp deform under long-term alkaline mud chemical erosion plus continuous middle arm reciprocating heavy vibration impact, and the built-in SUS304 stainless steel spiral constant tension spring can maintain uniform stable medium thick clamping pressure on the medium wide sealing lip for more than 26500 continuous working hours without elastic fatigue relaxation. The matched medium wide thick flat gaskets and mud-proof large O-rings adopt low-temperature modified HNBR material, which can retain soft stable thick sealing elasticity without hardening and large brittle cracking at -140℃ alpine northern winter construction environment, while ordinary single replacement medium heavy reciprocating oil seals only carry a single thin oil-blocking lip without supporting multi-layer mixed mud-gravel isolation auxiliary sealing accessories. The glass-boron-silicon hybrid fiber medium thick oversized PA66 backup rings can effectively prevent the medium thick soft rubber wide sealing lip from being squeezed into tiny gaps between piston rod and cylinder sleeve under instantaneous medium-high hydraulic pressure surge during stick arm lifting startup, which is an essential medium heavy precision structural component not equipped on basic single aftermarket reciprocating oil seals. Compared with separately purchasing scattered wide thick gaskets and mud-proof large O-rings, this integrated complete matching kit can finish the whole medium heavy stick cylinder overhaul with one unified set of medium wide thick oversized accessories, greatly shorten vehicle heavy maintenance downtime of medium heavy road and mine excavation fleets; compared with thin all-rubber seal kits without thick double-layer metal skeleton and rigid medium thick anti-extrusion backup rings, it will not produce permanent wide lip mud-gravel abrasion thermal deformation and continuous medium-volume hydraulic oil leakage failure under long-term mixed mud coverage, medium-high hydraulic pressure and repeated medium heavy long-stroke reciprocating extrusion load. This full composite multi-component medium thick sealing kit vastly extends the overall service life of the stick arm cylinder rod sealing system compared with single loose medium heavy reciprocating oil seals, and significantly reduces repeated medium heavy maintenance labor costs and frequent bulk heavy spare parts comprehensive procurement costs for highway infrastructure and medium open-pit mine construction fleets.

6. Exhibition and Wearhous

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