In the challenging environment of heavy construction and mining, machine downtime is costly. That's why Growshine International (格莳国际) is your trusted partner for premium, cost-effective replacement **engineering machinery parts**. Specializing in the import and export of **heavy-duty truck parts**, **agricultural machinery parts**, and **auto parts**, we offer a massive inventory of high-quality components designed to meet or exceed OEM specifications. Our range covers critical electrical components, including a comprehensive selection of **Starter Relays** and **Electrical Relays** for global brands.

Are you looking for a reliable alternative to the expensive dealer-only CAT Starter Relay, a durable Komatsu Starter Relay, or a robust Volvo Starter Relay? Our product lineup features everything from the VOE14531201 for Volvo EC210, EC240, EC290 Excavators to the 259-5274 Starter Motor Relay for CAT 320 Excavators. We ensure every part, including the 14529298 for Volvo and the 301202-00153 for Doosan loaders, delivers reliable performance in the toughest conditions.

Essential Starter Relays for Major Equipment Brands

Our commitment at **Growshine International** is to supply top-tier **engine parts replacement** and **hydraulic system components** to the global market. We have organized our extensive catalog of starter relays below, making it easy to find the exact part you need for your **Heavy Equipment Electrical System**. This includes specialized components like the 111-4870X Starter Time Relay for E320B Excavator and high-amperage units like the 216-4970 120A Starter Relay for Caterpillar equipment. We also stock parts for Yanmar Engine models, such as the 129930-77970, and Isuzu Excavator relays like 182550-3251.

Why Choose Growshine for Your Heavy Equipment Parts?

At **Growshine International**, we understand that sourcing reliable **China replacement parts** for CAT excavators, Komatsu wheel loaders, Volvo articulated trucks, and other heavy equipment is a primary concern for equipment owners and repair shops. Our mission is to provide an uninterrupted supply of high-quality **Starter Relay** units like the 171-2211 (90A) and 461-6784 for Caterpillar E330D, and the ME067625 for Mitsubishi/Komatsu equipment, ensuring minimal **heavy equipment repair** downtime. We also carry specialized items like the **Loader Relay 149-2612** for CAT 950G/938H. Our expansive network allows us to source nearly any component, from basic **auto parts** to complex **construction machinery electrical components** and **truck engine parts**.

Check out our special offer: Ensure your Volvo genset is running smoothly with the **Volvo Generator Set TAD1631GE Oil Pressure Sensor 866835 (沃尔沃发电机组TAD1631GE机油压力传感器866835)** - Click for Limited-Time Promotion! This vital **engine sensor** helps prevent costly engine damage.

Key Component Deep Dive: Terms and Technical Knowledge

Understanding the components is crucial for proper **heavy machinery maintenance**. Here are a few essential definitions from our core offerings: **engineering machinery parts, heavy-duty truck parts, agricultural machinery parts, auto parts**:

1. **Starter Solenoid Relay (Magnetic Switch)**: An electromagnetic switch typically mounted on or near the **Starter Motor**. It acts as a heavy-duty switch, enabling the small current from the ignition switch to control the high current required to turn the starter motor. *Example: Komatsu PC200-7 Motor Starter Relay / Komatsu PC200-7 发动机启动继电器 / Реле стартера Komatsu PC200-7.*
2. **Oil Pressure Sensor**: Located in the **engine block or oil filter housing**, it monitors the engine's oil pressure and sends a signal to the gauge or ECU. *Example: Volvo TAD1631GE Oil Pressure Sensor / Volvo TAD1631GE 机油压力传感器 / Датчик давления масла Volvo TAD1631GE.*
3. **Time Relay (Timer Relay)**: An electrical component in the **control circuit (cabin or fuse box)** used to control the duration of a circuit's operation. *Example: CAT E320B Starter Time Relay / CAT E320B 启动时间继电器 / Реле времени стартера CAT E320B.*
4. **Battery Relay Switch (Main Power Switch)**: Often installed near the **battery compartment** or **cabin entry**, it connects/disconnects the main electrical power from the battery to the rest of the machine. *Example: Komatsu PC300-7 Battery Relay Switch / Komatsu PC300-7 蓄电池继电器开关 / Реле аккумулятора Komatsu PC300-7.*
5. **Fuse Relay Box**: The central distribution point for various circuits, usually located in the **cabin or engine compartment**, housing fuses and relays. *Example: Yanmar 4TNV98 Starter Fuse Relay Box / Yanmar 4TNV98 启动保险丝继电器盒 / Блок реле предохранителей Yanmar 4TNV98.*
6. **Speed Sensor**: Mounted on the **transmission or final drive**, it measures the rotational speed for control or display purposes. *Example: Case CR9060 Combines Wheel Speed Sensor / Case CR9060 联合收割机轮速传感器 / Датчик скорости колеса Case CR9060.*
7. **Hydraulic Pump Regulator**: A part of the **main hydraulic pump**, it controls the displacement and output pressure of the pump. *Example: Hyundai R225-7 Hydraulic Pump Regulator / Hyundai R225-7 液压泵调节器 / Регулятор гидронасоса Hyundai R225-7.*
8. **Fuel Filter Housing**: Holds the fuel filter cartridge, located in the **engine bay**, to clean the fuel before it reaches the injection system. *Example: Isuzu 4HK1 Fuel Filter Housing / Isuzu 4HK1 燃油滤清器座 / Корпус топливного фильтра Isuzu 4HK1.*
9. **Air Brake Chamber**: Part of the **heavy-duty truck** braking system, typically found at the **wheels**, converting air pressure into mechanical force to apply the brakes. *Example: Freightliner Cascadia Air Brake Chamber / Freightliner Cascadia 空气制动气室 / Камера пневматического тормоза Freightliner Cascadia.*
10. **Steering Tie Rod End**: Connects the **steering rack/box to the steering knuckle** on an **automobile or truck**, transmitting force to turn the wheels. *Example: Toyota Corolla AE101 Steering Tie Rod End / Toyota Corolla AE101 转向拉杆端 / Наконечник рулевой тяги Toyota Corolla AE101.*

Common Questions & Troubleshooting

• **Q: Why is my heavy equipment starter motor clicking but not turning over?** (Heavy Equipment Starter Motor Troubleshooting)
  A: A common cause is a failing **Starter Solenoid** or **Starter Relay**. The solenoid (like the 3916302 for Cummins engines) is responsible for both engaging the pinion gear and passing the high current to the motor. A loud click often means the relay is energizing but the main contacts are corroded or worn, preventing full current flow. Test the relay's coil and main contacts for voltage and resistance.
• **Q: How do I choose between a 12V and 24V Starter Relay?** (12V vs 24V Electrical System)
  A: You must match the voltage to your machine's electrical system. Most smaller **agricultural machinery parts** and compact excavators run on 12V (e.g., CA1-DC12V-N), while larger **engineering machinery** like the Volvo EC700 or CAT D8R typically use 24V (e.g., 14382341). Using the wrong voltage will damage the relay coil or fail to operate.
• **Q: What is the main difference between a regular Relay and a Time Relay?** (Standard vs Time Relay Function)
  A: A regular relay operates instantaneously when its coil is energized. A **Time Relay** (like the **104-3204 Timer Relay** for CAT E320) has a built-in delay mechanism (either upon energizing or de-energizing the coil) and is used for specific functions like glow plug pre-heating or sequencing operations in the **electrical control system**.

Troubleshooting: Doosan DX300 Excavator Fails to Start

Fault: A **Doosan DX300 Excavator** (which might use a solenoid relay similar to the DX series) will not crank when the key is turned to the start position. All dash lights come on.
Solution:

1. Check the battery voltage and connections.
2. Verify the fuse for the starting circuit in the **Starter Fuse Relay Box**.
3. Locate the **Starter Solenoid Relay** (often on the firewall or near the starter) and test the coil. The coil should receive 12V/24V when the key is turned to start.
4. If the relay coil receives power but the large terminals do not connect power to the starter, the relay (such as a generic Doosan-style solenoid) is likely defective and needs replacement. This issue often involves the relay responsible for the 301202-00087-style circuits in Hyundai/Doosan equipment. Replace the faulty **Starter Solenoid Relay** to restore cranking power.

Your Global Partner in Parts: Growshine International

With a comprehensive focus on **construction equipment parts supply** and **global machinery components export**, **Growshine International** is dedicated to providing high-value **heavy equipment spare parts** solutions. Visit our websites: ar-excel.com, ampleresiliencesoft.com, cgsc66.com, cgsc-equip.com, and en.xinsheng2024.com to explore our full range of **affordable truck spares**, **Kubota tractor parts**, **Isuzu engine parts**, and other specialized components like the **Magnetic Switch 118-3534** for CAT Loaders. Partner with **Growshine** for quality, reliability, and unparalleled value in the **heavy equipment aftermarket**.