{"product_id":"bartell-21738-main-shaft-oem-replacement-part","title":"Bartell 21738 Main Shaft - OEM Replacement Part","description":"\u003cp\u003eTransferring rotational force from the gearbox to the trowel blade assembly, the main shaft is a critical drivetrain component in walk behind trowel machines, when it wears, cracks, or fails, the machine loses power transmission entirely and must be taken out of service for immediate repair.\u003c\/p\u003e\u003cp\u003eThis is a direct OEM replacement main shaft for the Bartell BC446 walk behind power trowel. As the central rotating element in the drive system, the main shaft is subject to significant torsional stress during operation, particularly under heavy finishing loads or when operating on stiff concrete mixes. Technicians should inspect the main shaft during routine drivetrain service for signs of wear at bearing contact surfaces, keyway deformation, or visible fatigue cracking. Any play, vibration, or grinding felt through the machine during operation may indicate shaft wear or bearing failure at the shaft journals and should be diagnosed promptly to avoid secondary damage to surrounding components.\u003c\/p\u003e\u003cp\u003eWhen replacing the main shaft, ensure all mating components, including bearings, bushings, and retaining hardware, are inspected and replaced as needed before reassembly. Proper alignment during reinstallation is essential to prevent premature wear and maintain smooth operation.\u003c\/p\u003e\u003cp\u003eCompatible models:\u003c\/p\u003e\u003cul\u003e\u003cli\u003eBartell BC446\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eGenuine Bartell Global OEM part, sold by an authorized dealer.\u003c\/p\u003e","brand":"Bartell","offers":[{"title":"Default Title","offer_id":43412762525744,"sku":"21738","price":200.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/6574\/7248\/files\/21738.jpg?v=1784314202","url":"https:\/\/cce-industries.com\/products\/bartell-21738-main-shaft-oem-replacement-part","provider":"CCE Industries","version":"1.0","type":"link"}