Excavator Engine C240 Main Bearing M4525 STD Daido Bearing

Product Details

Product Overview

This is a genuine Daido Main Bearing, specifically the M4525 STD size, designed for use in the Isuzu C240 diesel engine. As a critical component of the engine’s rotating assembly, this main bearing ensures the crankshaft rotates smoothly within the engine block, reducing friction and supporting the high loads generated during operation.

Sourced from Japan, this bearing is manufactured to meet the original equipment specifications for the Isuzu C240 engine. This engine model is widely recognized for its durability and is commonly found in various industrial applications, including compact excavators, generators, and agricultural machinery. The “STD” designation indicates this is a standard size bearing, intended for use with a crankshaft that has not been reground.

Please verify the specific engine model and application before purchase to ensure correct fitment, as variations may exist between different equipment manufacturers using this engine platform.

Key Features & Benefits

• Genuine Daido Quality: This is an authentic Daido bearing, a trusted OE supplier known for precision engineering and high material quality, ensuring long-lasting performance.
• Precise STD Dimensions: Manufactured to exact standard size (STD) specifications for the C240 crankshaft journal, providing the correct oil clearance for optimal lubrication and engine health.
• Enhanced Durability: Designed to withstand the high pressures and rotational forces within a diesel engine, reducing wear and extending the service life of the crankshaft and engine block.
• Direct Replacement: A direct drop-in replacement for the original bearing in your Isuzu C240 engine, simplifying the rebuilding or repair process.
• Improved Engine Performance: Proper main bearing fitment is crucial for maintaining correct crankshaft alignment, which directly impacts engine smoothness, power output, and overall reliability.
• Reliable Sourcing: Sourced from Japan, guaranteeing high manufacturing standards and consistent quality control.

Technical Specifications

OEM Cross-Reference

This bearing is a direct replacement for the following OEM and standard part numbers:

• Daido Part Number: M4525
• Isuzu OEM Number: 1-13411-025-0
• Isuzu OEM Number: 9-11251-023-0
• Common Reference: 134110250

Compatibility

This main bearing is specifically designed for the Isuzu C240 diesel engine. This engine is commonly used for the following applications:

• Excavators: Often found in mini and compact excavators from manufacturers like Sumitomo, Kobelco, and other Japanese OEMs that utilized the Isuzu C240 powerplant.
• Industrial Engines: Used in generators, water pumps, and other industrial equipment powered by the C240 engine.
• Agricultural Machinery: Some tractors and harvesters also utilize this engine series.

Note: This is a standard size bearing. It is intended for use with a standard, unground crankshaft journal. Always confirm your engine model and crankshaft journal size before purchasing.

Global Supply & Distribution

We offer worldwide shipping to support international B2B buyers. Our logistics network ensures fast and reliable delivery to major industrial ports and centers across the globe.

• North America: Fast delivery to the USA, Canada, and Mexico.
• Europe: Efficient shipping to the UK, Germany, France, and all EU countries.
• Asia-Pacific: Reliable service to Japan, South Korea, Australia, and Southeast Asian markets.
• Middle East & Africa: Serving major industrial hubs in the UAE, Saudi Arabia, and South Africa.
• South America: Shipping to Brazil, Argentina, and Chile.

We are experienced in international trade documentation and can handle various shipping terms (FOB, CIF, EXW) to meet your procurement requirements.

Quality Assurance

This bearing is sourced from Japan and is a genuine Daido product. It is manufactured under strict quality control standards, ensuring it meets the original equipment specifications for the Isuzu C240 engine.

• Manufacturing Standards: Meets or exceeds OE specifications for material hardness, dimensional accuracy, and fatigue strength.
• Warranty: Comes with a 3-month warranty against manufacturing defects.
• After Warranty Service: Video technical support is available to assist with installation and troubleshooting.

FAQ

Q: Is this bearing a direct fit for my Isuzu C240 engine in my excavator?
A: Yes, this Daido M4525 STD main bearing is designed as a direct replacement for the main bearings in a standard Isuzu C240 engine. However, it is critical to ensure your crankshaft journals are at standard size and have not been previously reground to an undersize (e.g., 0.25mm or 0.50mm). We recommend verifying the part number on your old bearing before ordering.

Q: What is the correct installation procedure for this main bearing?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Thoroughly cleaning the bearing bore and the back of the bearing shell. 2) Ensuring the bearing locking tab sits correctly in the groove. 3) Applying clean engine oil to the bearing surface. 4) Torquing the main bearing cap bolts to the factory specification for the C240 engine (typically in a specific sequence and to a specific ft-lb/Nm value). Improper installation can lead to bearing failure.

Q: How can I confirm if my engine needs a standard (STD) or undersize bearing?
A: The crankshaft journal size determines this. If your crankshaft is original and has never been machined, it will require a standard (STD) bearing. If the crankshaft has been reground during a previous rebuild, the journal diameter will be smaller, requiring an undersize bearing (e.g., 0.25mm, 0.50mm). You can measure the journal diameter with a micrometer or check the markings on the existing bearing shells. This listing is specifically for STD size only.