Steel wire reinforcement layer-421-03-41191

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Komatsu Bulldozers

Steel wire reinforcement layer-421-03-41191

PRODUCT DESCRIPTION:

The 421-03-41191 component is the engine radiator water inlet pipe (or thermostat radiator inlet pipe) for Komatsu D65/D85 bulldozers. This critical system delivers high-temperature engine coolant to the radiator for efficient heat dissipation, engineered to withstand heavy-duty vibration, dust exposure, and extreme temperature variations. Featuring high-pressure anti-knock performance, thermal resistance, leak-proof construction, and flexible connections, it serves as the cooling system's core component that prevents overheating and maintains engine temperature stability, ensuring continuous heavy-load operation.

PRODUCT DETAILS

Core Features

High-Temperature Coolant Delivery: Delivers high-temperature coolant from the engine water jacket to the radiator, completing the cooling cycle and preventing engine overheating.

Pressure Balancing: Maintains stable cooling system pressure, prevents vapor lock, and ensures smooth coolant circulation.

Flexible Connection: Absorbs engine vibration and thermal expansion/contraction displacement (axial compensation ±15 mm), preventing rigid connection breakage.

Leak-Proof Sealing: Sealing lips at both ends + clamps ensure tight fastening, preventing coolant leakage and reducing losses and environmental pollution.

Temperature Resistance and Protection: Suitable for high-temperature and high-pressure operating conditions, resists oil and dust corrosion, and extends service life.


Product Superiority

Original Factory Precise Fit: Length, pipe diameter, and connector angle are perfectly matched to the D65/D85 cooling system, allowing for direct replacement without repair.

High Temperature Resistance and Aging Resistance: The EPDM inner layer is resistant to coolant corrosion over long periods, with no swelling or cracking, and a lifespan of ≥3000 hours.

High Pressure and Explosion Resistance: The steel wire reinforced layer has a burst pressure ≥0.8 MPa, far exceeding the system's working pressure, with a safety factor ≥2.5.

Durable Sealing: Galvanized steel connectors + dedicated clamps ensure reliable sealing with a leakage rate of <0.05%, suitable for bumpy operations.

Convenient Maintenance: The modular design allows for on-site replacement in just 15-20 minutes, minimizing downtime.


Installation and Maintenance Points

Before installation, inspect the hose for signs of aging, bulging, and cracks. Ensure the connectors are clean and free of rust. Apply coolant to lubricate the sealing lips.

After aligning the connectors, tighten the clamps to a torque of 8-12 N·m. Avoid overtightening to prevent damage to the hose or undertightening to prevent leaks.

Check the clamp tightness and for leaks every 200 hours. Replace the hose every 1500 hours or 1 year to prevent aging and failure.

Avoid contact between the hose and high-temperature components (such as the exhaust manifold). Maintain a distance of ≥50 mm to prevent burns.

Purge air before starting the engine to ensure smooth cooling system circulation and prevent air locks that could cause engine overheating.


Suitable Scenarios and Value

Suitable Scenarios: Suitable for heavy-duty, dusty, and temperature-varying environments such as mines, earthmoving sites, and wetlands, ensuring stable cooling systems.

Core Value: Reduces the risk of engine overheating failures, minimizes downtime losses, and improves overall machine operating efficiency and reliability.

SPECIFICATION

Project

Details

Part Number

421-03-41191 (Original rubber hose assembly, including hose, steel wire reinforcement layer, galvanized steel connector, stainless steel clamp, and sealing lip)

Compatible Models

Komatsu D65 (EX/PX/PD series), D85 (EX/PX series) cooling system main circulation

Compatible Parts

Engine outlet - radiator inlet, or thermostat cover - radiator inlet short connection

Core Material

Inner layer: EPDM rubber (coolant resistant/high temperature resistant); Reinforcing layer: 2-3 layers of high carbon steel wire braid; Outer layer: neoprene rubber (wear resistant and anti-aging); Connector: galvanized steel/stainless steel

Compatible Working Conditions

Working pressure: 0.1-0.3 MPa, temperature: -40℃~+135℃, resistant to vibration, frequent bending, and dust and oil contamination


Parameters

numerical values

Notes

Inner Diameter

φ40-φ48 mm

Compatible with overall machine cooling flow rate

Length

450-550 mm

Matches installation space according to model

Working Pressure

0.1-0.3 MPa

Standard cooling system pressure

Burst Pressure

≥0.8 MPa

High safety factor

Temperature Range

-40℃~+135℃

Coverage of extreme environments

Bending Radius

≥55 mm

Adaptable to installation paths

Clamp Torque

8-12 N·m

Tightens to original factory standards


INQUIRE IMMEDIATELY

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