{"product_id":"castair-beltguard-for-c3-g30-compressors-40x20x7","title":"Castair Beltguard for C3 G30 Compressors 40x20x7\"","description":"\u003cp\u003eThe Castair 4BG7 is the OEM steel belt guard for Castair C3 and G30 air compressors. At 40 x 20 x 7 inches, this is the largest of the Castair belt guard family — the 7-inch depth reflects the wider belt and pulley stack found on the C3 and G30 models, which are heavier-duty units than the C1\/D3\/G11 family. If you are running a C3 or G30 and the factory guard needs replacement, the 4BG7 is the correct part. Do not attempt to substitute the 3BG or 4BG — the depth dimension is not interchangeable.\u003c\/p\u003e\n\n\u003ch3\u003eSafety and Compliance\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOSHA 29 CFR 1910.219:\u003c\/strong\u003e All belt and pulley drives must be guarded during operation. The 4BG7 is the factory solution for the C3 and G30 — it covers the full belt run and pulley faces in compliance with federal rotating machinery guarding requirements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhy depth matters:\u003c\/strong\u003e The C3 and G30 use a wider drive assembly than smaller Castair models. A guard with insufficient depth — such as the 5-inch 3BG or 4BG — will not fully cover the pulley face. Partial coverage is a compliance failure, not a compliant installation. The 4BG7's 7-inch depth is engineered for the C3\/G30 drive geometry.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsurance and liability:\u003c\/strong\u003e Operating heavy-duty shop equipment without correct guarding creates liability exposure. An OEM part number on your maintenance records demonstrates due diligence. A modified or ill-fitting aftermarket guard does not.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-RPM hazard:\u003c\/strong\u003e The C3 and G30 are higher-output compressors. The belt drives on these units move faster and carry more load than smaller reciprocating units. The exposed belt hazard is proportionally greater — the 4BG7 eliminates it when properly installed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eConstruction and Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrame material:\u003c\/strong\u003e Steel construction — welded and formed to match the C3 and G30 frame geometry. Steel resists the shop environment: oil mist, vibration, impact from carts and tooling.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 40 inches wide x 20 inches tall x 7 inches deep. The 7-inch depth is the key differentiator from the 4BG (5-inch depth). Do not order based on width and height alone.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtective finish:\u003c\/strong\u003e Corrosion-resistant coating suitable for a working compressor bay environment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM bolt pattern:\u003c\/strong\u003e Mounts directly to C3 and G30 frame mounting points. No modification required on the correct model.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight and durability:\u003c\/strong\u003e Steel construction at this size has real weight — the 4BG7 stays put under vibration and does not rattle loose over time the way lightweight aftermarket guards can.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCastair C3:\u003c\/strong\u003e The 4BG7 is the correct belt guard for the C3. The C3 is a larger reciprocating compressor than the C1 or C2, and the wider belt drive is why the 7-inch depth is required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCastair G30:\u003c\/strong\u003e The G30 shares the same belt guard mounting requirements as the C3. Confirm your G30 is the belt-drive configuration — direct-drive variants do not use this guard.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot compatible with C1, C2, D3, G11:\u003c\/strong\u003e Those models use the 3BG (32x20x5) or 4BG (40x20x5). The depth difference is real and significant.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIdentifying your model:\u003c\/strong\u003e The model number is on the compressor nameplate, typically on the crankcase or tank. If the nameplate is worn, you can also identify the model from the original purchase documentation or the compressor's pump specification tag.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWhen in doubt, call:\u003c\/strong\u003e 866-217-0063. Give us the model number and we will confirm which guard you need before you order.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLock out \/ tag out:\u003c\/strong\u003e The C3 and G30 are high-output units. De-energize, lock out, and tag out before removing or installing the belt guard. This is non-negotiable.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect bolt-on:\u003c\/strong\u003e The 4BG7 mounts to the existing frame holes on the C3 and G30. Remove old guard hardware, position the 4BG7, reinstall hardware. No drilling or modification required if you have the correct model.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspect drive components while the guard is off:\u003c\/strong\u003e With the guard removed and the unit locked out, inspect the V-belt condition (cracking, glazing, fraying), pulley alignment, and bearing condition. The cost to replace a belt during a scheduled guard swap is minimal compared to an emergency service call.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfirm guard seating before restart:\u003c\/strong\u003e The 4BG7 at 40x20x7 is a substantial component. Confirm all fasteners are secure and the guard is fully seated before restoring power.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIf the bolt pattern does not match:\u003c\/strong\u003e Stop. Do not drill new holes. Call 866-217-0063 — you may have the wrong part number for your specific C3 or G30 variant.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenuine OEM parts:\u003c\/strong\u003e The 4BG7 we ship is the factory Castair guard, not a generic steel fabrication that approximates the dimensions. OEM fit, OEM finish, OEM mounting pattern.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecialist since 2016:\u003c\/strong\u003e We focus on air compressor parts. We know the Castair lineup, including which guard goes on which model and why the depth dimensions matter.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree shipping:\u003c\/strong\u003e Standard orders ship free. No freight markup on heavy steel parts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFree technical support:\u003c\/strong\u003e Call 866-217-0063. If you are unsure whether your C3 or G30 variant takes the 4BG7 or a different configuration, we can verify from the model and serial number.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty:\u003c\/strong\u003e Genuine Castair parts carry manufacturer warranty. Aftermarket substitutes do not.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342509269205,"sku":"4BG7","price":692.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/CastairBeltGuard_73cdcc25-2748-492f-a693-6746453a9f0d.jpg?v=1772652531","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-beltguard-for-c3-g30-compressors-40x20x7","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}