Description
Steel Gear Set for Sadko, Zenit, Foresta Electric Chainsaw Gearbox (∅68 mm, 39 teeth / ∅8 mm)
Helical bevel steel gear pair (driven + driving) is designed to transfer torque from the armature of a longitudinally mounted electric motor to the drive sprocket of electric chainsaws. The set consists of a large driven gear with a solid stepped shaft (outer diameter 68 mm, 39 helical teeth, total height 33 mm) and a small driving armature gear (internal mounting diameter 8 mm, height 16.5 mm). Both parts are made of high-strength structural steel with induction surface hardening of the teeth, ensuring high wear resistance, smooth engagement, and resistance to impact loads when sawing hard wood.
Key Advantages and Features:
- Hardened Alloy Steel: The teeth and shaft journals undergo thermal hardening, which prevents edge stripping and metal chipping when the saw chain jams in the cut.
- Helical Bevel Geometry (39 teeth): The spiral tooth profile increases the contact area in the engagement, reduces gearbox noise, and evenly distributes the load on the bearing supports.
- Solid Metal Driven Gear Shaft: The 18 mm diameter shaft sleeve (with a 10 mm internal through-channel for the spindle/mounting bolt) ensures a rigid coaxial fit without radial runout.
- Precise Driving Gear Fit: The 8 mm internal hole ensures a tight press-fit onto the rotor shaft end without slippage.
- Supplied as a Matched Pair: Factory run-in of the tooth profile for both gears guarantees proper thermal clearance and a long service life for the gearbox assembly.
Compatibility and Application:
The set is used in electric chainsaws with a longitudinal (straight) motor arrangement and a power rating of 2000–2950 W, provided the mounting dimensions match:
- Sadko (Sadko): ECS-2440, ECS-2400S.
- Zenit / Zenit Profi: ЦПЛ-406/2800, ЦПЛ-405/2600.
- Foresta (Foresta): FS-2840DS, FS-2640DS.
- Tekhmann: CSE-2840.
- Tatra Garden: MSE-230, MSE-240.
- Stiga: SEV 2416 Q 16.
- Vorskla: ПМЗ 2950/405.
- Forte: 2440 (FEC-2440).
- Green Garden: GCS/E-2800.
- Grant: ПЦ-2800.
- Minsk, Best, Procraft, Vityaz, Ural, Energomash, Dnipro-M: electric chainsaw models with a longitudinal motor and identical bevel pair dimensions (68×18×10 mm / 8 mm).
Technical Specifications:
| Parameter | Large Gear (driven) | Small Gear (driving) |
|---|---|---|
| Outer Diameter (D) | 68 mm | ≈ 19–20 mm |
| Inner Diameter (d) | 10 mm (through hole in the shaft) | 8 mm (armature shaft fit) |
| Outer Diameter of Shaft / Sleeve | 18 mm | — |
| Total Part Height (H) | 33 mm | 16.5 mm |
| Number of Teeth | 39 pcs (helical tooth) | 10–11 pcs (helical tooth) |
| Engagement Type | Helical bevel pair | |
| Material | Structural alloy steel with induction hardening | |
