{"product_id":"4243-640-0509","title":"4243 640 0509 STIHL Gear Housing (0°, 500 mm) – Genuine OEM Gear Head Part","description":"\u003ch1 data-start=\"0\" data-end=\"76\"\u003e4243 640 0509 STIHL Gear Housing (0°, 500 mm) – Genuine OEM Gear Head Part\u003c\/h1\u003e\n\u003cp data-start=\"78\" data-end=\"442\"\u003eThe STIHL Gear Housing (0°, 500 mm) (4243 640 0509) is a genuine OEM gearbox casing component designed for select STIHL long-reach hedge trimmers and KombiSystem hedge trimmer attachments. This gear housing forms the protective outer body of the 0° gear head assembly, supporting internal gears, bearings, and lubrication required for smooth blade drive operation.\u003c\/p\u003e\n\u003cp data-start=\"444\" data-end=\"810\"\u003eOver time, gear housings can become damaged due to impact, excessive vibration, wear, or contamination from debris and grease leaks. A cracked or worn housing may lead to misalignment, lubricant loss, overheating, or premature gearbox failure. Replacing it with the correct OEM part restores proper gear head integrity without replacing the entire attachment system.\u003c\/p\u003e\n\u003cp data-start=\"812\" data-end=\"999\"\u003eManufactured to STIHL factory specifications, this genuine gear housing ensures precise fitment, secure sealing, and long-term durability under demanding professional trimming conditions.\u003c\/p\u003e\n\u003chr data-start=\"1001\" data-end=\"1004\"\u003e\n\u003ch2 data-start=\"1006\" data-end=\"1024\"\u003eProduct Details\u003c\/h2\u003e\n\u003cp data-start=\"1026\" data-end=\"1248\"\u003eOEM Part Number: 4243 640 0509\u003cbr data-start=\"1056\" data-end=\"1059\"\u003eBrand: STIHL (Genuine OEM)\u003cbr data-start=\"1085\" data-end=\"1088\"\u003ePart Type: Gear Housing \/ Gear Head Casing\u003cbr data-start=\"1130\" data-end=\"1133\"\u003eConfiguration: 0° Gear Head, 500 mm\u003cbr data-start=\"1168\" data-end=\"1171\"\u003eApplication: Blade drive gearbox assembly\u003cbr data-start=\"1212\" data-end=\"1215\"\u003eCondition: New Genuine OEM Part\u003c\/p\u003e\n\u003chr data-start=\"1250\" data-end=\"1253\"\u003e\n\u003ch2 data-start=\"1255\" data-end=\"1266\"\u003eFunction\u003c\/h2\u003e\n\u003cp data-start=\"1268\" data-end=\"1307\"\u003eThis STIHL gear housing is designed to:\u003c\/p\u003e\n\u003cul data-start=\"1309\" data-end=\"1587\"\u003e\n\u003cli data-start=\"1309\" data-end=\"1362\"\u003e\n\u003cp data-start=\"1311\" data-end=\"1362\"\u003eEnclose and protect internal gear head components\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1363\" data-end=\"1414\"\u003e\n\u003cp data-start=\"1365\" data-end=\"1414\"\u003eMaintain proper alignment of gears and bearings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1415\" data-end=\"1478\"\u003e\n\u003cp data-start=\"1417\" data-end=\"1478\"\u003eRetain gearbox lubrication for smooth blade drive operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1479\" data-end=\"1530\"\u003e\n\u003cp data-start=\"1481\" data-end=\"1530\"\u003eReplace cracked, damaged, or worn gear housings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1531\" data-end=\"1587\"\u003e\n\u003cp data-start=\"1533\" data-end=\"1587\"\u003eRestore long-term gearbox durability and performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1589\" data-end=\"1679\"\u003e⚠️ A damaged gear housing can cause grease leakage, gear misalignment, or gearbox failure.\u003c\/p\u003e\n\u003chr data-start=\"1681\" data-end=\"1684\"\u003e\n\u003ch2 data-start=\"1686\" data-end=\"1717\"\u003eVerify Fitment (Recommended)\u003c\/h2\u003e\n\u003cp data-start=\"1719\" data-end=\"1744\"\u003eBefore ordering, confirm:\u003c\/p\u003e\n\u003cul data-start=\"1746\" data-end=\"1928\"\u003e\n\u003cli data-start=\"1746\" data-end=\"1779\"\u003e\n\u003cp data-start=\"1748\" data-end=\"1779\"\u003eOEM part number 4243 640 0509\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1780\" data-end=\"1820\"\u003e\n\u003cp data-start=\"1782\" data-end=\"1820\"\u003eGear head configuration (0°, 500 mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1821\" data-end=\"1867\"\u003e\n\u003cp data-start=\"1823\" data-end=\"1867\"\u003eYour unit model matches those listed below\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1868\" data-end=\"1928\"\u003e\n\u003cp data-start=\"1870\" data-end=\"1928\"\u003eApplication matches your STIHL illustrated parts diagram\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1930\" data-end=\"2035\"\u003e⚠️ Gear head housings are model-specific — always verify by OEM part number and attachment configuration.\u003c\/p\u003e\n\u003chr data-start=\"2037\" data-end=\"2040\"\u003e\n\u003ch2 data-start=\"2042\" data-end=\"2058\"\u003eCompatibility\u003c\/h2\u003e\n\u003cp data-start=\"2060\" data-end=\"2184\"\u003eThis OEM gear housing fits select STIHL hedge trimmer attachments equipped with 0° gear head assemblies (500 mm), including:\u003c\/p\u003e\n\u003ch3 data-start=\"2186\" data-end=\"2234\"\u003eKombi \/ Long-Reach Hedge Trimmer Attachments\u003c\/h3\u003e\n\u003cp data-start=\"2236\" data-end=\"2298\"\u003eHL-KM (Gear head 0° 500 mm)\u003cbr data-start=\"2263\" data-end=\"2266\"\u003eHL-KM 0° (Gear head 0° 500 mm)\u003c\/p\u003e\n\u003cp data-start=\"2300\" data-end=\"2329\"\u003eHL 0° (Gear head 0° 500 mm)\u003c\/p\u003e\n\u003cp data-start=\"2331\" data-end=\"2362\"\u003eHL 56 K (Gear head 0° 500 mm)\u003c\/p\u003e\n\u003cp data-start=\"2364\" data-end=\"2450\"\u003e(Exact fitment depends on production version — always verify using OEM parts diagram.)\u003c\/p\u003e\n\u003chr data-start=\"2452\" data-end=\"2455\"\u003e\n\u003ch2 data-start=\"2457\" data-end=\"2478\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul data-start=\"2480\" data-end=\"2908\"\u003e\n\u003cli data-start=\"2480\" data-end=\"2522\"\u003e\n\u003cp data-start=\"2482\" data-end=\"2522\"\u003eDisconnect spark plug before servicing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2523\" data-end=\"2574\"\u003e\n\u003cp data-start=\"2525\" data-end=\"2574\"\u003eRemove cutter bar and access gear head assembly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2575\" data-end=\"2636\"\u003e\n\u003cp data-start=\"2577\" data-end=\"2636\"\u003eDrain and clean gearbox area if grease leakage is present\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2637\" data-end=\"2691\"\u003e\n\u003cp data-start=\"2639\" data-end=\"2691\"\u003eDisassemble gear head carefully on a clean surface\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2692\" data-end=\"2752\"\u003e\n\u003cp data-start=\"2694\" data-end=\"2752\"\u003eTransfer internal gears, bearings, and seals as required\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2753\" data-end=\"2820\"\u003e\n\u003cp data-start=\"2755\" data-end=\"2820\"\u003eInstall new gear housing and reassemble to STIHL specifications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2821\" data-end=\"2866\"\u003e\n\u003cp data-start=\"2823\" data-end=\"2866\"\u003eRepack gearbox with STIHL-approved grease\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2867\" data-end=\"2908\"\u003e\n\u003cp data-start=\"2869\" data-end=\"2908\"\u003eTest blade drive for smooth operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2910\" data-end=\"3022\"\u003e⚠️ Gearbox rebuilding should be performed by a qualified technician to ensure correct alignment and lubrication.\u003c\/p\u003e\n\u003chr data-start=\"3024\" data-end=\"3027\"\u003e\n\u003ch2 data-start=\"3029\" data-end=\"3048\"\u003eMaintenance Tips\u003c\/h2\u003e\n\u003cul data-start=\"3050\" data-end=\"3359\"\u003e\n\u003cli data-start=\"3050\" data-end=\"3116\"\u003e\n\u003cp data-start=\"3052\" data-end=\"3116\"\u003eInspect gear head housing regularly for cracks or grease leaks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3117\" data-end=\"3166\"\u003e\n\u003cp data-start=\"3119\" data-end=\"3166\"\u003eMaintain proper gearbox lubrication intervals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3167\" data-end=\"3217\"\u003e\n\u003cp data-start=\"3169\" data-end=\"3217\"\u003eAvoid impact with hard objects during trimming\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3218\" data-end=\"3274\"\u003e\n\u003cp data-start=\"3220\" data-end=\"3274\"\u003eReplace worn seals promptly to prevent contamination\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3275\" data-end=\"3359\"\u003e\n\u003cp data-start=\"3277\" data-end=\"3359\"\u003eAlways use genuine STIHL OEM gear head components for correct fit and durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STIHL","offers":[{"title":"Default Title","offer_id":58959941926993,"sku":"4243 640 0509","price":139.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/2570\/0177\/files\/4243_640_0509_2.jpg?v=1770828688","url":"https:\/\/www.barryspowerequipment.com\/products\/4243-640-0509","provider":"Barry's Power Equipment","version":"1.0","type":"link"}