369-1255 261-0376 Excavator Engine Belt Tensioner For Catepillar E312D E312D2 E313D Excavator And C4.4 Engine

369-1255 261-0376 Belt Tensioner Excavator Engine Parts For Catepillar  E312D E312D2 E313D Excavator And C4.4 Engine

Specifications

Compatible models

Catepillar  

E312D E312D2 E313D Excavator

C4.4 Engine

More other Belt Tensioner applied to some equipment

Product  picture:

Working Principle and Core Functions

Our excavator belt tensioner pulley is a premium aftermarket spare part for heavy‑duty construction machinery engine accessory systems. Designed to work under tough field conditions, it maintains consistent belt tension to eliminate slipping, rattling noise and premature belt degradation.

It supports steady operation of key components including alternators, water pumps and cooling fans.Built with high‑precision heavy‑load bearings and durable metal casing, this tensioner delivers smooth rotation, great heat resistance and strong anti‑vibration performance.

It is engineered as a direct‑fit replacement for original OEM parts, compatible with Catepillar, Komatsu, V0lV0, Hitachi, Hyundai, Sany and other well‑known excavator manufacturers. Precise dimensional calibration allows simple installation without any modification. 

We offer this quality tensioner pulley for global customers, bulk purchasing and OEM customization are both available.

Working Principle:

1. Constant Tension Output: A built‑in coil spring applies steady force to the tensioner arm, pressing the idler pulley firmly against the serpentine belt to keep tension within the optimal 800‑1200 N range.

2. Automatic Wear Compensation: As the serpentine belt stretches from long‑time operation, the tensioner arm rotates automatically to make up for belt elongation, keeping tension stable without manual adjustment.

3. Hydraulic Shock Absorption: The integrated hydraulic damper absorbs shocks from engine vibration and sudden load changes. It restricts excessive swing of the tensioner arm, preventing belt fluttering and slippage on rough working sites.

4. Reliable Power Delivery: Stable belt tension creates solid contact between the belt and accessory pulleys. It transfers engine power smoothly to run all essential engine‑mounted accessories.

Core Functions:

1. Belt Tension Stabilization: Maintains proper tension for the serpentine belt. It prevents slippage‑caused troubles such as engine overheating, poor accessory performance and accelerated belt wear.

2. Extended Service Life: Hydraulic damping effectively reduces belt oscillation and flutter. It helps extend belt service life from 2,000 hours to more than 5,000 working hours.

3. Reduced Maintenance Work: Self‑adjusting design removes the need for regular manual tension inspection and tuning, cutting down unnecessary machine downtime.

4. Guarantee for Accessory Performance: Provides stable power supply for alternators for battery charging, water pumps for engine cooling, and air compressors for brake and hydraulic circuits, effectively lowering the chance of unexpected machine breakdown.

We could supply the following excavator spare parts:

1. Electric parts: sensors, solenoid valve, Alternator, monitor, controller, wiring harness etc.

2. Engine parts: engine assembly, block assembly, belt, fan blade, turbocharger, fuel injection pump, piston, piston ring, cylinder block, cylinder head, crankshaft, starting motor and alternator etc.

3. Hydraulic parts: hydraulic pump, travel motor, swing motor, main control valve, main valve, hydraulic cylinder, final drive, swing machinery etc.

4. Undercarriage parts: track roller, carrier roller, track link, track shoe, sprocket, idler and idler cushion etc.

5. Cab parts: operator's cab, seat, door, monitor, controller etc.

6. Cooling parts: radiator, air conditioner, compressor, after cooler etc.

7. Other parts: service kit, swing circle, engine hood, swing joint, fuel tank, filter, boom, arm, bucket etc.

Packing and Shipping:

Paper carton for light-weight spare parts; wooden box for heavy-weight parts. Non-standard customized packing and original packaging are available upon request. By sea, by air, or by express (DHL, TNT, FedEx, UPS, EMS).

Advantage:

Our company is located near Zhuji International Machinery Parts City, Tianhe District, Guangzhou, one of Asia’s largest distribution hubs for construction machinery spare parts.

Benefiting from the complete local supply chain, we can quickly source abundant stock of spare parts for excavators, bulldozers and loaders.

1. We supply high‑quality excavator spare parts with favorable pricing for global buyers

2. All items come with a 6-12‑month quality guarantee

3. Every product undergoes strict inspection prior to dispatch

4. Stable production capacity ensures on‑schedule shipment

5. Complete product portfolio covers hydraulic, engine, electric, undercarriage and cooling system parts

6. Accept custom orders based on customer drawings and physical samples

7. Rich industrial background with years of manufacturing and international trade experience

8. Dedicated QC department & responsive sales team, available for 24‑hour consultation

Product Warranty:

1. Warranty Period: The warranty period ranges from 3 to 12 months, subject to the product pricing.

2. Warranty Scope: We offer replacement service for parts confirmed to have manufacturing‑originated quality defects.

3. Warranty Exclusions: Warranty shall become invalid under the following circumstances:

-Wrong order information provided by customers

- Force Majeure

- Improper installation and misuse

- Rust & damage resulted from incorrect storage and inadequate maintenance