Products Description
HUS61 HUS268 HUS272 Forged Crankshaft & Con-Rod Kit | Chainsaw Engine Bottom-End Rebuild
Drop-Forged Reciprocating Motion Conversion Assembly featuring Copper-Plated Connecting Rod and Induction-Hardened Journals for 60cc-75cc Professional Powerhead Restoration.
HUS61/HUS268/HUS272 Chain saw Crankshaft
The HUS61/268/272 forged crankshaft assembly constitutes the fundamental reciprocating-to-rotary motion conversion core of the engine bottom end-the structural heart that transforms the linear piston thrust into the rotational torque driving the chain. Drop-forged from a high-density alloy steel blank, it integrates two precision-balanced counterweights that neutralize the primary reciprocating inertial forces generated at peak operating speeds exceeding 12,000 RPM. The mated copper-finished connecting rod features a honed big-end bore and a bronze-bushed small-end, factory-matched to the crankpin for the exact running clearance that supports hydrodynamic oil-film formation between the rod bearing and the journal. Purpose-calibrated as a complete direct-replacement assembly, it restores the absolute dimensional relationships between crankshaft, connecting rod, and crankcase that govern compression height, port timing, and the vibration-free power delivery essential for professional timber harvesting.
Technical Profiles & Materials
Drop-Forged Alloy Steel Crankshaft Core One-piece hot-forged Cr-Mo / high-manganese steel crank with continuous grain flow along crank webs. Less internal stress than cast or bar-machined cranks, resisting fatigue fracture after millions of alternating torsion & bending cycles for professional logging chainsaws.
Copper-Plated Forged Connecting Rod Precision forged rod with full copper plating. Copper layer blocks corrosion from acidic combustion residues and moisture inside crankcases; worn copper on thrust surfaces acts as an early warning sign of metal contact before total breakdown.
Induction-Hardened Bearing Journals Main journals and crankpin receive local induction hardening to HRC 58–62 wear-resistant surface, while the inner core stays ductile to absorb impact shocks. Perfect for crankpins bearing sharp combustion pressure surges via connecting rods.
Integral Counterweight Mass Balancing Matched opposing counterweights generate counter centrifugal force to offset piston, ring, wrist pin and small-end reciprocating mass. Eliminates primary vibration, cutting hand fatigue during long chainsaw felling, pruning and cutting work.
Technical Specifications
| ITEM | DETAILS |
| Type | Forged Crankshaft & Connecting Rod Assembly (Complete) |
| Application | HUS61 / HUS268 / HUS272 / 60cc-75cc Professional Chainsaw |
| Code | 0109131 |
| Material | Drop-Forged Alloy Steel / Copper-Plated Con-Rod / Bronze Small-End Bushing |
| Details explanation | Crankshaft + Connecting Rod (Factory-Matched, Pre-Assembled) |
| Brand Name | SeaSummer |
| Operating Temp | -30°C to +150°C (Crankcase Internal) |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
Complete Bottom-End Engine Overhaul
Serves as the definitive short-block restoration core for professional chainsaw repair centers addressing the catastrophic bottom-end failure modes that condemn a saw to the scrap heap-a seized big-end bearing from oil-starvation or debris ingestion, a fatigue-fractured connecting rod from sustained over-revving, or a bent crankshaft from a severe chainsaw kickback impact. This complete matched assembly restores every critical dimensional relationship within the crankcase in a single installation procedure.
Post-Kickback Structural Damage Recovery
Ideally suited for salvaging professional logging saws that have suffered a severe kickback event where the instantaneous rotational deceleration-as the moving chain encounters an immovable object-transmits a shock load through the drive sprocket, clutch, and crankshaft that bends the crankpin or fractures the connecting rod at its weakest cross-section. The complete crankshaft-and-rod replacement is mandatory in these cases, as a bent crankpin is visually undetectable yet produces the eccentric crankshaft rotation that destroys new main bearings and crank seals within hours of installation.
High-Hour Professional Saw Lifecycle Extension
An essential engine-bottom-end spare assembly for forestry equipment distributors, chainsaw dealership service departments, and professional logging crews who rebuild their own equipment. Maintaining a stocked crankshaft assembly for the HUS61/268/272 platform family-representing some of the most durable and widely-deployed professional felling saws-ensures that a worn or damaged bottom end can be restored within a single service session, returning a high-productivity saw to active timber harvesting rather than waiting weeks for backordered OEM components during peak logging season.
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
Production process
Quality control
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Customer Reviews
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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