Komatsu 4D95 Thermostat 600-421-6120 600-421-6240 Engine Cooling Parts

Product Details

Product Overview

This high-quality thermostat, identified by part numbers 600-421-6120 and 600-421-6240, is a direct replacement component designed for Komatsu 4D95 diesel engines. As a critical element of the engine cooling system, this thermostat regulates coolant flow to maintain optimal operating temperature, ensuring efficient combustion and reducing engine wear.

Commonly utilized in heavy machinery such as excavators, loaders, bulldozers, and forklifts, this part is essential for maintaining engine performance under demanding conditions. Manufactured to OEM size specifications, it offers a reliable fit for your Komatsu engine rebuild or repair needs.

Key Features & Benefits

• Precise Temperature Control: Ensures the engine reaches and maintains its ideal operating temperature quickly, improving fuel efficiency and reducing emissions.
• OEM-Spec Design: Manufactured to the exact dimensions and material standards of the original Komatsu part, guaranteeing a perfect fit and reliable seal.
• Durable Construction: Built with high-grade materials to withstand the thermal stress and vibration common in heavy-duty diesel applications.
• Enhanced Engine Protection: Prevents overheating and excessive cold running, which can lead to premature wear on cylinder components and reduced oil life.
• Direct Replacement: Simple plug-and-play installation requiring no modifications, saving valuable workshop time.
• Rigorous Testing: Each unit is verified for opening temperature and stroke before shipment, ensuring immediate functionality.

Technical Specifications

OEM Cross-Reference

This thermostat directly replaces the following original Komatsu part numbers:

• 600-421-6120
• 600-421-6240

Compatibility

This thermostat is specifically designed for the Komatsu 4D95 diesel engine series. It is commonly used in the following types of heavy equipment:

• Excavators
• Forklifts
• Loaders
• Bulldozers
• Trucks & Buses

Note: Fitment is based on the engine model. Please verify your specific engine serial number and existing part to confirm compatibility before purchase.

Global Supply & Distribution

We maintain a robust global supply chain to serve international B2B buyers efficiently. Our inventory is strategically located to ensure fast dispatch to major ports and industrial hubs worldwide.

• Major Markets: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands, Poland), Asia-Pacific (Australia, Japan, Singapore, Indonesia), Middle East (UAE, Saudi Arabia), Africa and South America.
• Shipping: We offer multiple shipping options including express (DHL, FedEx, UPS), air freight, and sea freight (FCL/LCL) to meet your project deadlines and budget.
• Trade Compliance: Experienced in international export documentation and customs clearance for engine components.

Quality Assurance

Quality is paramount in our production process. Every thermostat is manufactured in a facility that adheres to strict quality control standards.

• Testing: A Machinery Test Report and Video Outgoing Inspection are provided with each shipment, verifying the opening temperature and structural integrity of the part.
• Certification: Our manufacturing processes follow industry standards for diesel engine components.
• Warranty: We back this product with a 6-month warranty against manufacturing defects, providing you with peace of mind for your repair or rebuild project.

FAQ

Q: How do I know if this thermostat fits my Komatsu engine?
A: This part is specifically designed for the Komatsu 4D95 engine model. To confirm compatibility, please cross-reference your existing part number with our listed OEM numbers (600-421-6120 or 600-421-6240). If you have a different engine model, please contact us with your engine serial number for assistance.

Q: What is the correct installation procedure for a diesel engine thermostat?
A: Installation should always be performed with the engine cool. Drain the coolant to below the thermostat housing level, remove the housing bolts, and replace the old gasket and thermostat. Ensure the new thermostat is oriented correctly (usually with the air bleed or jiggle pin facing upwards). Reassemble the housing, tighten bolts to the manufacturer’s torque spec, and refill with the correct coolant mixture. Always bleed air from the cooling system after installation to prevent hot spots.

Q: What is the typical opening temperature for this thermostat?
A: While the exact opening temperature is calibrated to the Komatsu 4D95 engine standard (typically around 76-82°C / 170-180°F), we recommend testing the unit before installation by submerging it in hot water with a thermometer to verify it opens at the correct temperature. Our outgoing inspection ensures this tolerance is met.