Products Description
HUS135 140 435 440 Crankshaft Oil Seal | Chainsaw Crankcase Leak-Proof Radial Lip Seal
Spring-Loaded Elastomeric Shaft Seal featuring Metal-Reinforced Outer Case and Garter-Spring Lip for Multi-Model 35cc-45cc Professional Chainsaw Crankcase Isolation.
HUS135/135/140/435/440 Oil seal
The HUS135/140/435/440 crankshaft oil seal constitutes a critical pneumatic-isolation interface engineered to maintain the absolute air-tight integrity of the 2-stroke engine crankcase-a sealed environment whose internal pressure-vacuum pulsation cycle is fundamental to the transfer-port scavenging that determines engine power output and fuel efficiency. Each seal consists of a precision-bonded nitrile or fluoroelastomer lip element housed within a stamped-steel outer reinforcing case, with an internal garter spring providing the calibrated radial contact force that maintains a micro-gap-free dynamic seal against the rotating crankshaft journal. The seal simultaneously prevents two catastrophic failure pathways: the ingress of atmospheric air that leans out the air-fuel mixture toward piston-seizure territory, and the egress of the fuel-oil-air crankcase charge that collapses transfer-port pressure and causes the progressive power-loss, erratic idle, and hot-restart difficulty that signal a failing seal.
Technical Profiles & Materials
Metal-Reinforced Outer Case Architecture Precision stamped steel outer shell with interference fit for direct press mounting into crankcase bore. Rigid metal housing keeps the seal lip perfectly concentric with crankshaft, avoiding uneven contact that triggers local overheating, fast lip wear and permanent shaft journal grooving.
Nitrile or Fluoroelastomer Spring-Loaded Lip Molded NBR/FKM sealing lip with micro-grooves generates thin return oil film on spinning shafts for hydrodynamic lubrication and leak blocking. Wrapped stainless steel garter spring delivers steady radial tension to offset lip abrasion, thermal expansion and minor shaft offset over long service hours.
Dual-Function Sealing Logic Bidirectional sealing design exclusive to 2-stroke chainsaw engines. Blocks pressurized crankcase gas from leaking out on power strokes, and stops outside air from being drawn inward during intake vacuum strokes. Optimized lip shape retains full sealing performance under constant reversing pressure fluctuations.
Technical Specifications
| ITEM | DETAILS |
| Type | Crankshaft Radial Lip Oil Seal (Spring-Loaded) |
| Application | HUS135 / HUS140 / HUS435 / HUS440 Chainsaw (35cc-45cc 2-Stroke) |
| Code | 0125029 |
| Material | Precision-Stamped Steel Outer Case / NBR-FKM Lip / Stainless Steel Spring |
| Details explanation | Press-Fit into Crankcase Seal Bore |
| Brand Name | SeaSummer |
| Operating Temp | --30°C to +120°C |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
Crankcase Air-Leak Diagnosis & Remediation
Serves as the primary pneumatic-isolation restoration component for small-engine technicians addressing the diagnostic triad of a failing crankshaft seal-a chainsaw that starts and idles acceptably but loses power and dies under cutting load as the crankcase charge leaks past the degraded seal lip, an engine that refuses to hold a consistent carburetor tune because the air-fuel ratio is being modulated by an uncontrolled air leak rather than the metering circuits, and the telltale oily residue around the flywheel or clutch-side seal bore that confirms external leakage.
Mandatory Crankcase-Split Seal Replacement
Ideally suited for obligatory seal installation during every bottom-end engine rebuild or crankcase-splitting procedure on HUS135, 140, 435, and 440 series chainsaws. Even if the original seals appear visually intact, the lip's internal fatigue, micro-cracking, and loss of garter-spring tension-all invisible to visual inspection-mean that reinstalling used seals guarantees a progressive air leak that undermines the rebuilt engine's compression, tune stability, and longevity within the first hours of post-rebuild operation.
HUS Multi-Model Fleet Service Standardization
An essential pneumatic-seal spare component for chainsaw dealerships, forestry equipment service centers, and professional arborist crews maintaining mixed fleets of HUS 135, 140, 435, and 440 series saws. The broad multi-model compatibility of these seals allows a single part number to cover four of the most widely deployed mid-range professional chainsaw platforms, dramatically reducing the inventory complexity, shelf-space requirements, and parts-ordering errors associated with stocking individual seal part numbers for each specific saw model in the fleet.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
Trusted Partnership Power
YOUR PROFESSIONAL ONE-STOP SOURCE
FOR 10000+ OUALITY PARTS
Verified Factory Excellence
BACKED BY 200+ TRUSTED FACTORY PARTNERS
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FAQ
Q: Are you an impartial industrial components dealer or a direct China water pump factors factory?
A:We are a direct, ISO9001-certified engineering water pump components manufacturing facility and precision fluid-control factor manufacture exporter primarily based in China. We function our personal cleanroom injection molding bays, computerized ultrasonic welding arrays, computerized hydraulic stress check stations, and clean-room packaging lines, passing direct-factory wholesale price financial savings straight to your element procurement margins.
Q: Can your manufacturing unit furnish full certification forms for food-contact or consuming water compliance?
A: Yes, absolutely. For food, beverage, or scientific applications, our manufacturing unit makes use of one hundred percent virgin, un-recycled polypropylene resins accompanied by means of fabric traceability certificates. We mechanically furnish B2B purchasers with complete FDA compliance documentation, NSF-grade compound declarations, and RoHS/REACH chemical protection screening sheets to make certain clean clearance thru worldwide customs.
Q: Do you provide customization picks for distinctly corrosive fluids like sturdy acids or ozone?
A: Yes, we are a thoroughly succesful OEM/ODM supplier. For aggressive chemical or ozone environments, we can improve the 12x26.5mm valve configuration in our factory: substituting the general PP housing with top class PVDF (Fluoropolymer) and changing any steel springs with Hastelloy or whole springless gravity-ball architecture, making sure final chemical resistance.
Q: How do we impervious a pattern batch to execute computerized lifecycle and burst-pressure testing?
A: We relatively inspire complete laboratory contrast earlier than logging mass grant agreements. We can ship a pattern lot of 5-10 gadgets of our inventory 12x26.5mm take a look at valves for assessment (setup costs and DHL/FedEx air freight apply). Once the factors pass by your inner lifecycle verification and a formal wholesale quantity manufacturing contract or container run is locked in, the sampling charges are a hundred percent credited returned to your industrial balance.
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