Description
Overview:
This Drive Pinion is a genuine Stihl replacement gear for long‐reach hedgetrimmers. Made from durable metal, it transfers power through the gearhead to the cutter, restoring smooth drive when the original pinion is worn or damaged. It is engineered for a precise fit in Stihl long‐reach machines and is a direct replacement for OEM No. 4243 640 2503. Designed to maintain performance and reliability in demanding use, it helps reduce noise, vibration, and premature wear on mating components. Ideal for routine servicing or a full gearhead overhaul, it supports consistent cutting performance on hedge maintenance jobs. Suited to models such as the HL 94 and HL 94 C, it keeps professional and domestic machines operating efficiently.
Key Features:
- Genuine Stihl part for assured fit and quality (OEM 4243 640 2503)
- Precision‐engineered to integrate seamlessly with the hedgetrimmer gearhead
- Robust metal construction for long service life under high load
- Restores smooth, efficient power transmission to the cutting blades
- Direct replacement component; no modifications required when used on listed models
- Helps prevent further wear to the mating gear and gearcase
- Suitable for preventative maintenance and gearbox rebuilds
- Supports reliable performance in professional and DIY use
Typical Applications:
Used during gearhead servicing of long‐reach hedgetrimmers when drive slip, excessive play, grinding, or uneven cutting indicates a worn pinion. Common in seasonal maintenance, after impact damage, or when refurbishing heavily used machines to restore cutting efficiency and extend overall tool life.
Also known as:
Drive gear, pinion gear, gear wheel, transmission pinion, cutter head pinion, angle drive gear, small gear, cog.
Fits Models:
FH-KM, FH-KM 145, FH-KM 145 deg, FH-KM145, FHKM, FHKM145, HL 91 K, HL 91 KC, HL 92 C, HL 92 KC, HL 94, HL 94 C, HL 94 K, HL 94 KC, HL-KM 0-145, HL-KM0-145, HL91K, HL91KC, HL92C, HL92KC, HL94, HL94C, HL94K, HL94KC, HLA 135, HLA 135 K, HLA135, HLA135K
Alternate Part Numbers:
4243-640-2503, 42436402503
Product Specifications
| L&S Part No. | 4243 640 2503 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 42436402503 |
| Unit of Sale | 1 |
| Applications | FH-KM, FH-KM 145, FH-KM 145 deg, FH-KM145, FHKM, FHKM145, HL 91 K, HL 91 KC, HL 92 C, HL 92 KC, HL 94, HL 94 C, HL 94 K, HL 94 KC, HL-KM 0-145, HL-KM0-145, HL91K, HL91KC, HL92C, HL92KC, HL94, HL94C, HL94K, HL94KC, HLA 135, HLA 135 K, HLA135, HLA135K |
| Machine Type | Long Reach Hedgetrimmers |
| Fits Brands | Stihl |
| Fits Models | FH-KM 145 deg | HL-KM 0-145 | HL91K, HL91KC | HL92C, HL92KC | HL94, HL94C, HL94K, HL94KC | HLA 135, HLA 135 K | FH 145° | HL 145° |
