Products Description
TD40 Brush Cutter Crankshaft - Precision-Forged Replacement Crankshaft Assembly for TD40 2-Stroke Brush Cutter Engines
High-Strength Steel Crankshaft with Connecting Rod & Counterweights - Direct OEM Replacement for TD40-Series Gasoline Brush Cutter Power Units
TD40 Brush cutter crankshaft
The TD40 Brush Cutter Crankshaft is a precision-engineered replacement crankshaft assembly manufactured for TD40-series 2-stroke gasoline brush cutter engines. The assembly comprises the forged steel crankshaft body with twin counterweight lobes, ground main journal shafts with threaded ends for flywheel and clutch drum mounting, and an attached forged bronze connecting rod - delivering a complete crank assembly ready for installation into a split crankcase without additional sub-component sourcing. The crankshaft is the mechanical core of the 2-stroke engine, converting the linear combustion force of the piston into the rotational output that drives the brush cutter shaft and cutting head. Crankshaft failure - typically caused by main bearing seizure, connecting rod big-end wear, or crankshaft web cracking from sustained vibration overload - results in complete engine failure requiring crankshaft replacement to restore the machine to operational condition. This replacement crankshaft is precision-ground on all bearing journal surfaces to achieve dimensional tolerances consistent with OEM specifications, ensuring correct main bearing fit, minimal rotational runout, and balanced operation across the engine's full RPM range.
Technical Profiles & Materials
1. Forged Steel Crankshaft Body with Precision-Ground Main Journals The crankshaft body is manufactured by hot forging from high-strength steel, producing a grain-aligned microstructure that provides superior fatigue resistance compared to cast or machined-from-billet alternatives. After forging, the main journal shafts are CNC-ground to a surface finish and diameter tolerance that ensures correct interference fit with the crankcase main bearings - the critical interface that determines crankshaft runout, vibration level, and main bearing service life in the assembled engine.
2. Forged Bronze Connecting Rod with Needle Bearing Big-End The connecting rod attached to the crankshaft crank pin is forged from bronze alloy, selected for its combination of compressive strength, fatigue resistance, and the inherent lubrication properties of bronze at the small-end and big-end bearing interfaces. In 2-stroke engines where oil is carried in the fuel mix rather than in a dedicated oil circuit, bronze rod construction provides a degree of boundary lubrication tolerance during momentary lean mixture conditions - reducing the risk of catastrophic rod seizure that occurs with steel rods under marginal lubrication.
3. Balanced Counterweight Geometry for Low-Vibration Operation The twin counterweight lobes flanking the crank pin are machined to a mass and angular position calculated to counterbalance the reciprocating mass of the piston and connecting rod at the TD40 engine's operating RPM range. Correct counterbalance is essential in a hand-held brush cutter where crankshaft imbalance transmits directly as handlebar vibration to the operator - a known cause of hand-arm vibration syndrome (HAVS) in professional operators and a source of accelerated fatigue-induced crankcase cracking in improperly balanced replacement crankshafts.
Technical Specifications
| ITEM | DETAILS |
| Type | Complete replacement crankshaft assembly with connecting rod - 2-stroke single-cylinder engine, bottom-end rebuild unit |
| Application | Compatible with TD40-series 2-stroke gasoline brush cutter engines; suitable for full engine bottom-end rebuilds in agricultural brush cutters, grass trimmers, and multi-attachment power tools |
| Code | 0223031 |
| Material | Hot-forged high-strength steel crankshaft body; CNC-ground main journal shafts; forged bronze connecting rod; hardened steel crank pin; threaded steel journal ends for flywheel and clutch drum mounting |
| Details explanation | Complete assembly includes: crankshaft body with twin counterweight lobes, ground main journal shafts (threaded ends), crank pin, and attached forged bronze connecting rod; precision-ground journal surfaces to OEM tolerance; balanced counterweight geometry; direct press-fit into TD40 crankcase main bearings |
| Brand Name | SeaSummer |
| Operating Temp | forged steel and bronze construction maintains dimensional stability and fatigue resistance at crankcase temperatures up to 120°C (248°F) during sustained full-throttle brush cutting |
| Delivery Time | 30 Days |
| Packaging | Cardboard packaging |
Products Application
TD40 Engine Bottom-End Rebuild & Crankshaft Replacement
When a TD40 brush cutter engine suffers crankshaft failure - through main bearing seizure, connecting rod big-end wear, or crank web fatigue cracking - replacing the crankshaft assembly is the correct repair path to restoring the engine to full rated output. This complete crank-and-rod assembly enables technicians to perform a full bottom-end rebuild in a single parts order, avoiding the extended lead times and assembly complexity of sourcing the crankshaft body, connecting rod, and crank pin as separate components. The precision-ground journals ensure the rebuilt engine achieves OEM-specification running tolerances from the first start.
Agricultural Brush Cutter Fleet Maintenance & Preventive Overhaul
Agricultural operations running fleets of TD40-powered brush cutters on intensive seasonal schedules benefit from scheduling preventive crankshaft inspections and proactive replacement at known service intervals - before crankshaft failure causes secondary damage to the crankcase, cylinder, or piston. Stocking replacement crankshaft assemblies enables maintenance teams to perform planned overhauls during off-season periods, returning the entire brush cutter fleet to full operational condition before the next cutting season without unplanned downtime during peak agricultural activity.
Small Engine Repair Workshops & OEM Parts Distributors
For repair workshops servicing TD40 brush cutters and OEM parts distributors supplying the agricultural equipment aftermarket, the TD40 crankshaft assembly is a high-value engine rebuild component with consistent demand from operators who choose to rebuild rather than replace failed machines. The complete assembly format - crankshaft, counterweights, crank pin, and connecting rod together - simplifies parts ordering for technicians and customers, reduces the risk of incorrect component pairing, and supports faster workshop throughput on bottom-end rebuilds compared to multi-part component sourcing.
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.
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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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