{"product_id":"comet-zwd4040g-k-pressure-washer-pump-with-unloader-4-0-gpm-4000-psi-1-gas-shaft","title":"Comet ZWD4040G-K Pressure Washer Pump with Unloader – 4.0 GPM 4000 PSI 1\" Gas Shaft","description":"\u003cdiv class=\"\" data-turn-id-container=\"6d5bf237-35a5-4896-9c24-4757c27585af\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--sticky-padding-top)\" dir=\"auto\" data-turn-id=\"6d5bf237-35a5-4896-9c24-4757c27585af\" data-turn-id-container=\"6d5bf237-35a5-4896-9c24-4757c27585af\" data-testid=\"conversation-turn-183\" data-turn=\"user\"\u003e\u003c\/section\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"\" data-turn-id-container=\"request-6a41e0a9-6a1c-83ea-8a2f-44e0120c15c3-9\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a41e0a9-6a1c-83ea-8a2f-44e0120c15c3-9\" data-turn-id-container=\"request-6a41e0a9-6a1c-83ea-8a2f-44e0120c15c3-9\" data-testid=\"conversation-turn-184\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"65960377-afb4-49a7-896f-d926f6eddcb1\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"205\"\u003e\u003cstrong data-start=\"0\" data-end=\"16\"\u003ePart Number:\u003c\/strong\u003e ZWD4040G-K\u003cbr data-start=\"27\" data-end=\"30\"\u003e\u003cstrong data-start=\"30\" data-end=\"43\"\u003eCategory:\u003c\/strong\u003e Pressure Washer Pumps → Triplex Pumps → Gas Pressure Washer Pumps\u003cbr data-start=\"109\" data-end=\"112\"\u003e\u003cstrong data-start=\"112\" data-end=\"121\"\u003eType:\u003c\/strong\u003e Comet ZWD4040G-K Pressure Washer Pump with Unloader – 4.0 GPM 4000 PSI 1\" Gas Shaft\u003c\/p\u003e\n\u003chr data-start=\"207\" data-end=\"210\"\u003e\n\u003cp data-start=\"299\" data-end=\"770\"\u003eThe \u003cstrong data-start=\"303\" data-end=\"377\"\u003eComet ZWD4040G-K Pressure Washer Pump with Unloader (Part #ZWD4040G-K)\u003c\/strong\u003e is a genuine OEM triplex plunger pump engineered for heavy-duty commercial and industrial pressure washing applications. Manufactured by \u003cstrong data-start=\"515\" data-end=\"530\"\u003eComet Pumps\u003c\/strong\u003e, this direct-drive pump delivers \u003cstrong data-start=\"564\" data-end=\"588\"\u003e4.0 GPM at 4,000 PSI\u003c\/strong\u003e, providing exceptional cleaning performance for contractors, fleet washing, construction equipment, agriculture, manufacturing facilities, and other demanding cleaning environments.\u003c\/p\u003e\n\u003chr data-start=\"1502\" data-end=\"1505\"\u003e\n\u003ch1 data-section-id=\"1oef6j8\" data-start=\"1507\" data-end=\"1532\"\u003eKey Features \u0026amp; Benefits\u003c\/h1\u003e\n\u003cul data-start=\"1534\" data-end=\"2059\"\u003e\n\u003cli data-section-id=\"zrz0lp\" data-start=\"1534\" data-end=\"1582\"\u003eGenuine Comet OEM triplex pressure washer pump\u003c\/li\u003e\n\u003cli data-section-id=\"1dycsa6\" data-start=\"1583\" data-end=\"1608\"\u003ePart Number: ZWD4040G-K\u003c\/li\u003e\n\u003cli data-section-id=\"1kd2ldb\" data-start=\"1609\" data-end=\"1658\"\u003eFactory-equipped with integrated unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"19tw6a9\" data-start=\"1659\" data-end=\"1694\"\u003eHeavy-duty triplex plunger design\u003c\/li\u003e\n\u003cli data-section-id=\"2eg04n\" data-start=\"1695\" data-end=\"1732\"\u003eDelivers up to 4.0 GPM at 4,000 PSI\u003c\/li\u003e\n\u003cli data-section-id=\"ah3gmi\" data-start=\"1733\" data-end=\"1776\"\u003eDesigned for gas-powered pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1tjs86y\" data-start=\"1777\" data-end=\"1825\"\u003e1-inch hollow shaft for direct engine mounting\u003c\/li\u003e\n\u003cli data-section-id=\"1xqjq8i\" data-start=\"1826\" data-end=\"1849\"\u003eOperates at 3,400 RPM\u003c\/li\u003e\n\u003cli data-section-id=\"2tq632\" data-start=\"1850\" data-end=\"1890\"\u003eCompatible with engines up to 14.5 GHP\u003c\/li\u003e\n\u003cli data-section-id=\"awldon\" data-start=\"1891\" data-end=\"1939\"\u003e15 mm ceramic plungers for extended durability\u003c\/li\u003e\n\u003cli data-section-id=\"3wdm8b\" data-start=\"1940\" data-end=\"1962\"\u003e1\/2\" FPT water inlet\u003c\/li\u003e\n\u003cli data-section-id=\"wqesop\" data-start=\"1963\" data-end=\"1994\"\u003e3\/8\" FPT high-pressure outlet\u003c\/li\u003e\n\u003cli data-section-id=\"1ozeeuz\" data-start=\"1995\" data-end=\"2059\"\u003eOEM-quality construction for demanding commercial applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2061\" data-end=\"2064\"\u003e\n\u003ch1 data-section-id=\"zjxypn\" data-start=\"2066\" data-end=\"2092\"\u003eTechnical Specifications\u003c\/h1\u003e\n\u003cp data-start=\"2094\" data-end=\"2121\"\u003e\u003cstrong data-start=\"2094\" data-end=\"2110\"\u003ePart Number:\u003c\/strong\u003e ZWD4040G-K\u003c\/p\u003e\n\u003cp data-start=\"2123\" data-end=\"2149\"\u003e\u003cstrong data-start=\"2123\" data-end=\"2138\"\u003ePump Model:\u003c\/strong\u003e ZWD4040G-K\u003c\/p\u003e\n\u003cp data-start=\"2151\" data-end=\"2180\"\u003e\u003cstrong data-start=\"2151\" data-end=\"2168\"\u003eManufacturer:\u003c\/strong\u003e Comet Pumps\u003c\/p\u003e\n\u003cp data-start=\"2182\" data-end=\"2242\"\u003e\u003cstrong data-start=\"2182\" data-end=\"2199\"\u003eProduct Type:\u003c\/strong\u003e Triplex Pressure Washer Pump with Unloader\u003c\/p\u003e\n\u003cp data-start=\"2244\" data-end=\"2274\"\u003e\u003cstrong data-start=\"2244\" data-end=\"2266\"\u003eMaximum Flow Rate:\u003c\/strong\u003e 4.0 GPM\u003c\/p\u003e\n\u003cp data-start=\"2276\" data-end=\"2307\"\u003e\u003cstrong data-start=\"2276\" data-end=\"2297\"\u003eMaximum Pressure:\u003c\/strong\u003e 4,000 PSI\u003c\/p\u003e\n\u003cp data-start=\"2309\" data-end=\"2342\"\u003e\u003cstrong data-start=\"2309\" data-end=\"2332\"\u003eMaximum Pump Speed:\u003c\/strong\u003e 3,400 RPM\u003c\/p\u003e\n\u003cp data-start=\"2344\" data-end=\"2374\"\u003e\u003cstrong data-start=\"2344\" data-end=\"2369\"\u003eGas Horsepower (GHP):\u003c\/strong\u003e 14.5\u003c\/p\u003e\n\u003cp data-start=\"2376\" data-end=\"2407\"\u003e\u003cstrong data-start=\"2376\" data-end=\"2391\"\u003eShaft Size:\u003c\/strong\u003e 1\" Hollow Shaft\u003c\/p\u003e\n\u003cp data-start=\"2409\" data-end=\"2440\"\u003e\u003cstrong data-start=\"2409\" data-end=\"2434\"\u003eCeramic Plunger Size:\u003c\/strong\u003e 15 mm\u003c\/p\u003e\n\u003cp data-start=\"2442\" data-end=\"2467\"\u003e\u003cstrong data-start=\"2442\" data-end=\"2458\"\u003eWater Inlet:\u003c\/strong\u003e 1\/2\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2469\" data-end=\"2503\"\u003e\u003cstrong data-start=\"2469\" data-end=\"2494\"\u003eHigh-Pressure Outlet:\u003c\/strong\u003e 3\/8\" FPT\u003c\/p\u003e\n\u003cp data-start=\"2505\" data-end=\"2550\"\u003e\u003cstrong data-start=\"2505\" data-end=\"2525\"\u003eConnection Size:\u003c\/strong\u003e 1\/2\" Inlet \/ 3\/8\" Outlet\u003c\/p\u003e\n\u003cp data-start=\"2552\" data-end=\"2570\"\u003e\u003cstrong data-start=\"2552\" data-end=\"2563\"\u003eWeight:\u003c\/strong\u003e 17 lbs\u003c\/p\u003e\n\u003cp data-start=\"2572\" data-end=\"2600\"\u003e\u003cstrong data-start=\"2572\" data-end=\"2596\"\u003eIntegrated Unloader:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003cp data-start=\"2602\" data-end=\"2626\"\u003e\u003cstrong data-start=\"2602\" data-end=\"2622\"\u003eOEM Replacement:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003chr data-start=\"2628\" data-end=\"2631\"\u003e\n\u003ch1 data-section-id=\"1w7a361\" data-start=\"2633\" data-end=\"2658\"\u003eCompatible Applications\u003c\/h1\u003e\n\u003cp data-start=\"2660\" data-end=\"2739\"\u003eDesigned for use with compatible gas-powered pressure washer systems featuring:\u003c\/p\u003e\n\u003cul data-start=\"2741\" data-end=\"3066\"\u003e\n\u003cli data-section-id=\"pa5scz\" data-start=\"2741\" data-end=\"2774\"\u003e1-inch horizontal engine shafts\u003c\/li\u003e\n\u003cli data-section-id=\"19w59al\" data-start=\"2775\" data-end=\"2813\"\u003eDirect-drive pressure washer systems\u003c\/li\u003e\n\u003cli data-section-id=\"1sz57u2\" data-start=\"2814\" data-end=\"2838\"\u003eEngines up to 14.5 GHP\u003c\/li\u003e\n\u003cli data-section-id=\"1ftw8hk\" data-start=\"2839\" data-end=\"2868\"\u003eCommercial pressure washers\u003c\/li\u003e\n\u003cli data-section-id=\"1wpc0sg\" data-start=\"2869\" data-end=\"2900\"\u003eIndustrial cleaning equipment\u003c\/li\u003e\n\u003cli data-section-id=\"1hb3h7x\" data-start=\"2901\" data-end=\"2924\"\u003eFleet washing systems\u003c\/li\u003e\n\u003cli data-section-id=\"9bm7jy\" data-start=\"2925\" data-end=\"2958\"\u003eAgricultural equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"1embcwq\" data-start=\"2959\" data-end=\"2992\"\u003eConstruction equipment cleaning\u003c\/li\u003e\n\u003cli data-section-id=\"6hse24\" data-start=\"2993\" data-end=\"3036\"\u003eEquipment replacement and repair projects\u003c\/li\u003e\n\u003cli data-section-id=\"mt98dm\" data-start=\"3037\" data-end=\"3066\"\u003eOEM equipment installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3068\" data-end=\"3184\"\u003eAlways verify shaft size, mounting configuration, engine horsepower, and pressure\/flow requirements before ordering.\u003c\/p\u003e\n\u003chr data-start=\"3186\" data-end=\"3189\"\u003e\n\u003ch1 data-section-id=\"1ebu7jn\" data-start=\"3191\" data-end=\"3229\"\u003eFunction of the Pressure Washer Pump\u003c\/h1\u003e\n\u003cp data-start=\"3231\" data-end=\"3257\"\u003eThe ZWD4040G-K pump helps:\u003c\/p\u003e\n\u003cul data-start=\"3259\" data-end=\"3569\"\u003e\n\u003cli data-section-id=\"1f0pk6l\" data-start=\"3259\" data-end=\"3300\"\u003eDeliver up to \u003cstrong data-start=\"3275\" data-end=\"3286\"\u003e4.0 GPM\u003c\/strong\u003e of water flow\u003c\/li\u003e\n\u003cli data-section-id=\"z8nl78\" data-start=\"3301\" data-end=\"3351\"\u003eGenerate operating pressures up to \u003cstrong data-start=\"3338\" data-end=\"3351\"\u003e4,000 PSI\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1nja5yy\" data-start=\"3352\" data-end=\"3408\"\u003eProvide reliable commercial-grade cleaning performance\u003c\/li\u003e\n\u003cli data-section-id=\"1o0h41r\" data-start=\"3409\" data-end=\"3470\"\u003eRegulate system pressure with the integrated unloader valve\u003c\/li\u003e\n\u003cli data-section-id=\"123j39a\" data-start=\"3471\" data-end=\"3513\"\u003eProtect the pump during bypass operation\u003c\/li\u003e\n\u003cli data-section-id=\"w8f7oe\" data-start=\"3514\" data-end=\"3569\"\u003eDeliver smooth, efficient continuous-duty performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3571\" data-end=\"3715\"\u003eIts heavy-duty triplex plunger design provides superior durability, improved efficiency, and longer service life than conventional pump designs.\u003c\/p\u003e\n\u003chr data-start=\"3717\" data-end=\"3720\"\u003e\n\u003ch1 data-section-id=\"mqxmo4\" data-start=\"3722\" data-end=\"3758\"\u003eCommon Signs Replacement Is Needed\u003c\/h1\u003e\n\u003cp data-start=\"3760\" data-end=\"3791\"\u003eReplace the pump if you notice:\u003c\/p\u003e\n\u003cul data-start=\"3793\" data-end=\"4013\"\u003e\n\u003cli data-section-id=\"zu24k4\" data-start=\"3793\" data-end=\"3821\"\u003eReduced operating pressure\u003c\/li\u003e\n\u003cli data-section-id=\"1f1izt\" data-start=\"3822\" data-end=\"3844\"\u003eDecreased water flow\u003c\/li\u003e\n\u003cli data-section-id=\"10eqapm\" data-start=\"3845\" data-end=\"3865\"\u003eWater or oil leaks\u003c\/li\u003e\n\u003cli data-section-id=\"rs3f56\" data-start=\"3866\" data-end=\"3893\"\u003eExcessive operating noise\u003c\/li\u003e\n\u003cli data-section-id=\"ti1eh4\" data-start=\"3894\" data-end=\"3922\"\u003eUnloader valve malfunction\u003c\/li\u003e\n\u003cli data-section-id=\"1g2txwa\" data-start=\"3923\" data-end=\"3956\"\u003eCracked or damaged pump housing\u003c\/li\u003e\n\u003cli data-section-id=\"16xn7rj\" data-start=\"3957\" data-end=\"3982\"\u003eExcessive internal wear\u003c\/li\u003e\n\u003cli data-section-id=\"1alt067\" data-start=\"3983\" data-end=\"4013\"\u003eLoss of cleaning performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4015\" data-end=\"4117\"\u003eReplacing a worn pump restores pressure washer performance while minimizing costly equipment downtime.\u003c\/p\u003e\n\u003chr data-start=\"4119\" data-end=\"4122\"\u003e\n\u003ch1 data-section-id=\"1547z5u\" data-start=\"4124\" data-end=\"4154\"\u003eInstallation \u0026amp; Service Notes\u003c\/h1\u003e\n\u003cul data-start=\"4156\" data-end=\"4728\"\u003e\n\u003cli data-section-id=\"12zv5pq\" data-start=\"4156\" data-end=\"4235\"\u003eShut down the pressure washer and disconnect the spark plug before servicing.\u003c\/li\u003e\n\u003cli data-section-id=\"s6lqar\" data-start=\"4236\" data-end=\"4266\"\u003eRelieve all system pressure.\u003c\/li\u003e\n\u003cli data-section-id=\"gtuvzx\" data-start=\"4267\" data-end=\"4386\"\u003eVerify compatibility with the \u003cstrong data-start=\"4299\" data-end=\"4315\"\u003e1-inch shaft\u003c\/strong\u003e, mounting configuration, engine horsepower, and pressure requirements.\u003c\/li\u003e\n\u003cli data-section-id=\"rdentd\" data-start=\"4387\" data-end=\"4453\"\u003eInstall the pump according to the manufacturer's specifications.\u003c\/li\u003e\n\u003cli data-section-id=\"u6is5z\" data-start=\"4454\" data-end=\"4520\"\u003eConnect the \u003cstrong data-start=\"4468\" data-end=\"4486\"\u003e1\/2\" FPT inlet\u003c\/strong\u003e and \u003cstrong data-start=\"4491\" data-end=\"4510\"\u003e3\/8\" FPT outlet\u003c\/strong\u003e fittings.\u003c\/li\u003e\n\u003cli data-section-id=\"1ki278h\" data-start=\"4521\" data-end=\"4616\"\u003eEnsure the integrated unloader valve is properly adjusted according to system specifications.\u003c\/li\u003e\n\u003cli data-section-id=\"z9jstr\" data-start=\"4617\" data-end=\"4660\"\u003ePrime the pump with water before startup.\u003c\/li\u003e\n\u003cli data-section-id=\"2i5ge8\" data-start=\"4661\" data-end=\"4728\"\u003eVerify proper operation and inspect for leaks after installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4730\" data-end=\"4943\"\u003e\u003cstrong data-start=\"4730\" data-end=\"4744\"\u003eImportant:\u003c\/strong\u003e Never operate the pump without an adequate water supply. Running the pump dry can quickly damage the ceramic plungers, seals, valves, and unloader assembly, significantly reducing pump service life.\u003c\/p\u003e\n\u003chr data-start=\"4945\" data-end=\"4948\"\u003e\n\u003ch1 data-section-id=\"16tfrdt\" data-start=\"4950\" data-end=\"4979\"\u003eMaintenance Recommendations\u003c\/h1\u003e\n\u003cul data-start=\"4981\" data-end=\"5478\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"ki1sxp\" data-start=\"4981\" data-end=\"5080\"\u003eCheck the pump oil level regularly and service the pump according to Comet maintenance schedules.\u003c\/li\u003e\n\u003cli data-section-id=\"ds9rhp\" data-start=\"5081\" data-end=\"5201\"\u003eInspect ceramic plungers, packings, water seals, valves, and the integrated unloader valve during routine maintenance.\u003c\/li\u003e\n\u003cli data-section-id=\"102oikd\" data-start=\"5202\" data-end=\"5267\"\u003eMaintain clean, filtered inlet water to minimize internal wear.\u003c\/li\u003e\n\u003cli data-section-id=\"amy22g\" data-start=\"5268\" data-end=\"5333\"\u003eFlush the pump after use when pumping dirty or corrosive water.\u003c\/li\u003e\n\u003cli data-section-id=\"qwqn77\" data-start=\"5334\" data-end=\"5478\" data-is-last-node=\"\"\u003eUse only genuine OEM Comet replacement parts and approved lubricants to maintain optimum pump performance, reliability, and long service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Comet","offers":[{"title":"Default Title","offer_id":53447040565611,"sku":null,"price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/ZWD4040G-K.jpg?v=1782955799","url":"https:\/\/generalsprayers.com\/products\/comet-zwd4040g-k-pressure-washer-pump-with-unloader-4-0-gpm-4000-psi-1-gas-shaft","provider":"GeneralSprayers","version":"1.0","type":"link"}