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9y-1785 9y1785 7c4184 Fuel Injector Assembly for Cat 785 789 793 Off-Highway Mining Trucks
| MOQ: | 1 pieces |
| Price: | US $260-268 / piece |
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Product Name
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Common Rail Diesel Fuel Injector
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Place of Origin
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Wuhan,China
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Warranty
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12 Months
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Delivery time
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3-5 Days, subject to the order quantity
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Quality
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100% Tested
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Packing
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Customer Requirement
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Service
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After-Sales Service
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Size
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Standard Size
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Payment
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TT,Trade Assurance,PayPal,Credit Card
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Advantage
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Perfect Fit
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Compatible Equipment Models
1. Off-Highway Mining Trucks (Ultra-Class)
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Cate-rpillar 785 Series: 785, 785B, 785C (Massive mining haul trucks)
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Cater-pillar 789 Series: 789, 789B, 789C
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Cater-pillar 793 Series: 793, 793B, 793C
2. Large Wheel Loaders
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Cater-pillar 994 Series: 994, 994D, 994E, 994F (CAT's largest mining wheel loaders)
3. Marine & Generator Applications
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Marine Propulsion Engines: Used extensively in large commercial vessels, tugboats, and cargo ships running CAT 3508 / 3512 / 3516 power plants.
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Generator Sets (Gensets): Heavy-duty industrial backup power generators (e.g., CAT 3512B / 3516B generator packages).
Company Info
Wuhan Jinhong Auto Parts Co., Ltd. is a manufacturer and exporter of common rail fuel injectors integrating manufacturing,processing and R & D.
Our company is Bos-ch common rail injector, Den-so common rail injector, Del-phi injector, CAT injector and other professional production and processing companies, with a complete and scientific quality management system. Our factory has a complete and scientific management system and professional product development team, products have been advancing with The Times, quality is also constantly improving, product quality and service have been widely recognized by the industry. Our company has its own factory, combined with the sales model of trade factory, we can provide customers with a full range of services. In addition, our company has international logistics partners to reduce transportation costs for customers. Our company is a leading manufacturer and supplier of Marine parts and auto parts in China. At the same time, we have established partnerships with hundreds of factories specializing in the production of various high-quality auto parts.
Our goal is to provide the best service at the best price, your satisfaction is our best return. Look forward to working with you. Welcome friends from all walks of life to visit, guidance and business negotiations.
Q1: What are the primary failure signs of a 9Y-1785 injector in a 3500 engine?
Because these engines are enormous (V8, V12, or V16 configurations), a single misfiring injector can sometimes be masked by the remaining healthy cylinders. Look for these specific operational signs:
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"Slobbering" (Liquid Fuel in the Exhaust): If the injector tip fails to atomize fuel or cracks, raw unburnt fuel travels down the manifold. In marine or generator applications, this manifests as wet dark liquid leaking from exhaust joints.
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Heavy Exhaust Smoke: Continuous black smoke indicates an over-fueling cylinder or a worn spray tip nozzle that is dripping rather than spraying.
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Localized Cylinder Overheating: A sticking injector can run a cylinder dangerously lean or excessively rich, causing extreme spikes in individual exhaust gas temperatures (EGTs), which can be tracked on a pyrometer.
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Fuel Dilution in Engine Oil: Internal seal leakage on the injector body allows fuel to leak directly into the valve cover deck, diluting the engine oil and dropping oil pressure.
Q2: Does this injector require electronic programming or "Trim Codes"?
No. The 9Y-1785 is a purely mechanical unit injector (MUI). Unlike modern common rail or electronic unit injectors (EUI), it does not have an electronic solenoid on top and contains zero digital memory. Injection timing and fuel metering are completely governed by a physical camshaft, rocker arms, and a mechanical governor linkage system. No computer or software programming is required upon replacement.
Q3: What causes these massive mechanical injectors to fail prematurely?
While built to be incredibly robust, the 9Y-1785 faces specific operational risks:
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Tip Erosion / Carbon Coking: In large industrial engines running continuously under variable or low loads (like standby generators), carbon deposits build up around the microscopic nozzle holes, distorting the spray pattern.
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Fuel Quality and Centrifuge Issues: In marine environments, if fuel purification centrifuges or primary water separators fail, heavy fuel contaminants or moisture enter the injector, rapidly tearing up the internal plunger and barrel assembly.
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Improper Linkage Synchronization: If the mechanical fuel rack control linkage is worn or out of adjustment, it can force the injector to deliver uneven fuel amounts compared to neighboring cylinders.
