6D114 Thermostat 3968559 for Komatsu Engine Parts Excavator Loader Forklift

Product Details

Product Overview

This high-quality Thermostat (Part Number: 3968559) is specifically designed for the Komatsu 6D114 diesel engine, a power unit widely used in heavy construction and industrial machinery. As a critical component of the engine’s cooling system, this thermostat regulates coolant flow to maintain optimal operating temperature, ensuring efficient combustion and preventing engine overheating or excessive wear.

Commonly applied in Komatsu excavators, loaders, bulldozers, and forklifts, this 3968559 thermostat is an OEM-grade replacement part that restores your engine’s thermal management performance. Manufactured to exacting specifications by, it provides a reliable, direct-fit solution for equipment operating in demanding environments across the globe.

Key Features & Benefits

• Precise Temperature Control: Opens and closes at the correct temperature threshold (typically 82°C or 180°F) to ensure the 6D114 engine reaches and maintains its ideal operating range, reducing fuel consumption and emissions.
• OEM-Grade Fitment: Manufactured to the exact dimensions and specifications of the original Komatsu part (3968559), guaranteeing a seamless installation with no modifications required.
• Durable Construction: Built with high-quality wax element and corrosion-resistant materials to withstand extreme heat cycles, vibration, and harsh operating conditions common in construction and mining sites.
• Engine Protection: Prevents cold-start wear by allowing the engine to warm up quickly, and avoids overheating by regulating coolant flow when the engine is under heavy load.
• Extended Service Life: Rigorously tested for reliability, offering a service life comparable to genuine Komatsu parts at a cost-effective price point.
• Enhanced Diagnostics: Easy visual inspection of thermostat operation helps mechanics quickly diagnose cooling system issues, reducing downtime for your equipment.

Technical Specifications

OEM Cross-Reference

This thermostat (Part Number: 3968559) is a direct replacement for the following OEM Komatsu part numbers and their equivalents:

• Komatsu Original: 3968559
• Cross-Reference Note: This part may also be listed under alternative supply codes for Komatsu 6D114 engine service kits. Always verify the physical dimensions and temperature rating against your original part before installation.

Compatibility

This 3968559 thermostat is commonly used for the following equipment and engine configurations:

• Engine Models: Komatsu 6D114 (including 6D114-1, 6D114-T variants)
• Excavators: Komatsu PC200-7, PC200-8, PC220-7, PC220-8 series (with 6D114 engine)
• Loaders: Komatsu WA380-5, WA380-6, WA430-5, WA470-5 models
• Bulldozers: Komatsu D65EX-15, D65PX-15, D85EX-15 series
• Forklifts & Trucks: Various Komatsu heavy-duty forklifts and industrial trucks equipped with the 6D114 engine
• Other Applications: Bus, generator sets, and agricultural machinery using the 6D114 platform

Note: Fitment may vary by specific machine serial number and engine configuration. Please confirm your engine model and existing part number before ordering.

Global Supply & Distribution

As a specialized supplier of diesel engine components, maintains a robust global distribution network to serve B2B clients worldwide. We offer fast and reliable shipping to all major industrial regions:

• North America: Regular shipments to ports in Los Angeles, Houston, New York, and Vancouver for distribution to construction and mining equipment dealers.
• Europe: Express delivery to Rotterdam, Hamburg, Antwerp, and major inland hubs for OEM and aftermarket workshops.
• Asia-Pacific: Direct service to Australia (Brisbane, Sydney), Southeast Asia (Singapore, Bangkok), and Japan/Korea markets.
• Middle East & Africa: Reliable shipping to Dubai, Jeddah, and major African ports for mining and infrastructure projects.
• Latin America: Regular routes to Brazil, Chile, and Mexico for heavy equipment maintenance.

We specialize in export trade compliance and can arrange air freight for urgent orders or sea freight for bulk shipments. All orders include proper documentation for customs clearance.

Quality Assurance

At, quality is our priority. Each 3968559 thermostat undergoes rigorous inspection to ensure it meets or exceeds OEM standards:

• Manufacturing Standards: Produced in an ISO-certified facility with strict quality control processes.
• Testing: Every unit is tested for opening temperature, lift height, and sealing performance. Video Outgoing Inspection and Machinery Test Reports are available upon request to verify product integrity.
• Warranty: Backed by a 6-month warranty against manufacturing defects, giving you peace of mind for your fleet maintenance.
• Packaging: Securely packed in plastic bags, individual boxes, or bulk cartons to prevent damage during transit.

FAQ

Q1: How do I confirm this 3968559 thermostat fits my Komatsu 6D114 engine?
A: Please check your engine’s serial number and the existing thermostat part number. The 6D114 engine is used across many Komatsu models (PC200, WA380, etc.), but minor design changes may occur. Measure the outer diameter of the thermostat housing and verify the opening temperature (typically 82°C stamped on the part). If your original part number matches 3968559, this is a direct fit.

Q2: What are the signs that my thermostat needs replacement?
A: Common symptoms include: engine overheating (especially under load), slow warm-up time, fluctuating temperature gauge readings, or coolant leaking from the thermostat housing. A stuck-closed thermostat causes overheating, while a stuck-open thermostat prevents the engine from reaching operating temperature, leading to poor fuel economy and increased wear.

Q3: Can I install this thermostat myself, and what maintenance tips should I follow?
A: Yes, replacement is straightforward for a qualified mechanic. Always drain the coolant below the thermostat level, remove the housing bolts, and replace the gasket (order separately if needed). After installation, refill with fresh coolant and bleed the system of air. We recommend testing the thermostat in a pot of hot water before installation to verify opening temperature. Replace the thermostat every 2-3 years or as part of your scheduled cooling system maintenance.