Are you facing unstable engine speed or throttle response failure in your heavy machinery? The LRS-385S (also searched as LRS385S) is a precision-engineered throttle stepper motor designed to restore the efficiency of your equipment. This essential component ensures accurate governor control, maintaining optimal fuel consumption and engine performance for the Caterpillar 320B, 320C, and 320D series.
As a leading supplier of CAT Replacement Parts, we provide OEM-standard components that guarantee a perfect fit and long-lasting durability in harsh construction environments.
| Specification Item | Product Details |
|---|---|
| Model NO. | CAT 320B, 320C, 320D, 320L Series |
| Product Name | Throttle Stepper Motor (Small Governor Motor) |
| Part Number | LRS-385S / LRS385S |
| Type | Electric Governor Control Motor |
| Condition | Brand New, OEM Standard Replacement |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express: DHL, Fedex, EMS, UPS or by Air/Sea |
| MOQ | 1 Piece |
| Stock Status | In Stock / Fast Dispatch within 24 Hours |
| Application | Engine rebuild, overhaul, maintenance, and governor repair |
| Feature | Our Replacement (LRS-385S) | Cheap Aftermarket Alternatives |
|---|---|---|
| Core Structure | OEM-standard tri-metal structure for heat resistance | Standard plastic or low-grade alloy |
| Response Speed | High-precision millisecond response | Delayed response leading to engine surges |
| Durability | Tested for 10,000+ hours of operation | High failure rate within 3 months |
| Installation | 100% Plug and Play compatibility | Requires wiring modifications |
| Warranty | Full Quality Assurance Guarantee | No after-sales support |
| Cost Efficiency | Optimizes fuel consumption | Causes fuel waste due to improper idling |
A faulty throttle motor can lead to unexpected downtime and increased fuel costs. Our team helps operators:
Identify potential risks during maintenance of CAT fuel systems
Recommend suitable replacement parts if needed for 320D engines
Support both inspection advice and parts supply for global fleets
Contact our experts today for a free diagnostic consultation via WhatsApp Us Now
A: Yes, if the 320C excavator fails to adjust RPM when the dial is turned, the LRS385S stepper motor is likely stuck or has a burnt internal coil. Replacing it with an OEM-standard motor usually solves the issue immediately.
A: Because we use an OEM-standard tri-metal structure. Our parts are Trusted by repair shops & equipment fleets worldwide for their reliability in high-temperature engine compartments.
A: Ensure the throttle linkage is lubricated and free of debris. Always use high-quality CAT maintenance parts and check the wiring harness for corrosion during your scheduled overhaul.
We specialize in professional engine solutions for Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, and Weichai. Our inventory covers full engine assemblies and critical internal components.
Our core product range includes: Cylinder Liners, Pistons, Piston Rings, Main Bearings, Con Rod Bearings, Thrust Washers, Overhaul Gasket Kits, Diesel Injection Pumps, Fuel Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
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