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The serpentine belt system of your SANY D12C4.12.2-2 engine demands a tensioner engineered for precise, continuous adjustment. The genuine 60268440 Belt Tensioner D12C4.12.2-2 is an OEM automatic tensioner designed to maintain factory‑spec belt tension throughout its service life. As a critical component among SANY parts, the 60268440 guarantees perfect compatibility, eliminates belt slippage, and reduces wear on both the belt and driven accessories.
Manufactured with a high‑strength aluminum housing, a precision‑damped torsion spring, and a sealed heavy‑duty bearing, it withstands the extreme vibrations and temperature cycles of construction, mining, and long‑haul operations. Investing in the authentic 60268440 restores factory‑engineered damping, prevents annoying chirping noises, and safeguards your engine from sudden belt failure.
60268440 Belt Tensioner D12C4.12.2-2
Натяжитель ремня D12C4.12.2‑2
Tensor de Correa D12C4.12.2‑2
The 60268440 automatic belt tensioner is the heart of your SANY D12C4.12.2‑2 engine’s accessory drive. Unlike a static idler pulley, this tensioner continuously adjusts to maintain optimal belt tension. It consists of a rugged die‑cast aluminum arm, a precision‑wound torsion spring, a high‑capacity pivot bearing, and a maintenance‑free damping mechanism. As the serpentine belt naturally stretches over time or when electrical loads fluctuate (alternator, A/C clutch), the 60268440 arm pivots to take up slack, ensuring constant, factory‑specified pressure on the belt.
This prevents slippage, which is the primary cause of belt squeal, reduced alternator output, and accelerated belt wear. The tensioner is calibrated specifically for the D12C4.12.2‑2 engine, delivering 385 N of nominal tension – the exact value required for maximum efficiency of all driven components.
Damping is the secret to a quiet, durable tensioner. The 60268440 incorporates a linear friction damping system integrated into the pivot housing. A proprietary composite friction pad contacts the tensioner arm with a calibrated resistance of 2.8 – 3.2 Nm. This damping prevents the arm from oscillating in response to engine firing pulses and road vibrations.
Without adequate damping, the tensioner would flutter, causing the belt to vibrate, creating noise, and accelerating wear on both belt and pulleys. SANY engineers have precisely matched the damping coefficient to the inertia of the D12C4.12.2‑2 drive system, resulting in a tensioner that remains absolutely stable across the entire engine speed range. This engineering excellence is why the genuine 60268440 outperforms all aftermarket substitutes.
Every material in the 60268440 tensioner is selected for extreme durability in heavy‑duty environments. The main housing and arm are die‑cast from A380 aluminum alloy, heat‑treated to T6 condition for maximum strength‑to‑weight ratio. The pulley is precision stamped from high‑carbon steel, then induction‑hardened on the contact surface to 55‑60 HRC, resisting grooving from continuous belt friction. Its 6‑rib profile exactly matches the geometry of the SANY serpentine belt, ensuring full face contact and even load distribution.
The pivot bearing is a double‑row, angular contact ball bearing manufactured to ABEC‑3 tolerances. It is packed with high‑temperature polyurea grease and sealed with multi‑lip nitrile rubber seals that exclude dust, water, and road salt. This bearing is designed to rotate smoothly for over 100,000 miles without maintenance.
The torsion spring in the 60268440 is a masterpiece of precision engineering. Wound from 10.5 mm diameter chromium‑silicon steel wire, it is shot‑peened to relieve surface stress and then preset at elevated temperature to eliminate settling. Its load curve is tailored to the D12C4.12.2‑2 engine, providing progressive tension as the belt stretches – a characteristic that extends effective service life. A built‑in visual wear indicator is molded into the tensioner arm.
When the arm reaches the marked limit position, it signals that the belt has stretched beyond the tensioner’s compensation range and replacement is due. This feature allows proactive maintenance, eliminating guesswork and preventing unexpected roadside failures. The 60268440 also incorporates a zinc‑rich E‑coat over all ferrous components, ensuring corrosion resistance even in harsh, salt‑laden environments.
The table below provides comprehensive technical data for the genuine SANY 60268440 Belt Tensioner. These parameters are essential for confirming compatibility and understanding the performance capabilities of this precision component.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | 60268440 | Genuine SANY Identification |
| Component Name | Belt Tensioner D12C4.12.2-2 | Automatic Serpentine Belt Tensioner |
| Housing Material | A380 Die‑Cast Aluminum, T6 Heat Treated | Lightweight, High Strength |
| Pulley Outer Diameter | 76.2 mm | Deep Groove, 6‑rib Profile |
| Pulley Width | 28.6 mm | Full Belt Contact |
| Pulley Surface Hardness | 55‑60 HRC | Induction Hardened |
| Bearing Type | Double‑Row Angular Contact | Sealed, Greased for Life |
| Bearing Clearance | C3 | Handles Thermal Expansion |
| Spring Wire Material | Chromium‑Silicon Steel | Oil‑Tempered, Shot‑Peened |
| Spring Wire Diameter | 10.5 mm | High Load Capacity |
| Nominal Tension Load | 385 N ± 25 N | At Mid‑Travel Position |
| Damping System | Linear Friction Pad | Proprietary Composite |
| Damping Torque | 2.8 – 3.2 Nm | Optimized for D12C4.12.2‑2 |
| Pivot Bearing Type | PTFE‑Lined Bronze Bush | Maintenance‑Free |
| Mounting Bolt Thread | M12 x 1.75 | Grade 10.9 |
| Mounting Bolt Torque | 48 Nm | Critical for Alignment |
| Visual Wear Indicator | Yes, Molded Mark on Arm | Shows Belt Stretch Limit |
| Operating Temperature | -40°C to +150°C | Continuous Operation |
| Corrosion Protection | E‑Coating on Steel Parts | 500+ Hour Salt Spray |
| Weight (Assembly) | 1.28 kg | Includes Pulley & Arm |
| Compatible Engines | SANY D12C4.12.2‑2 | Verify with Engine Serial |
Installing the 60268440 Belt Tensioner is a straightforward procedure, but it requires careful attention to detail. Begin by ensuring the engine is cool and the vehicle is safely supported. Disconnect the negative battery cable. Using a serpentine belt tool or a 3/8‑inch drive breaker bar, insert the square drive into the tensioner’s release socket and rotate the arm clockwise to relieve belt tension. Slip the belt off the tensioner pulley and slowly release the arm. Remove the center mounting bolt (typically 16 mm hex) and extract the old tensioner. Thoroughly clean the mounting boss on the engine bracket to remove any debris or corrosion. Position the new genuine 60268440 tensioner, ensuring the alignment dowel (if present) engages the locating hole.
Hand‑tighten the bolt, then torque it to 48 Nm using a calibrated torque wrench. Do not guess – incorrect torque can distort the housing or alter belt alignment. Reinstall the belt, verifying correct routing per the under‑hood diagram. Rotate the crankshaft one full turn clockwise by hand to confirm the belt seats properly in all pulley grooves. Remove the shipping pin (if installed) from the new tensioner to allow free arm movement. Reconnect the battery, start the engine, and verify quiet operation.
The 60268440 is specifically engineered for SANY D12C4.12.2‑2 engines. It is not interchangeable with tensioners from other D12 variants without verifying part numbers. Always cross‑reference the part number 60268440 with your truck’s VIN or the original equipment part label. Using the correct tensioner ensures the proper belt wrap angle and tension curve, which are essential for maximum alternator output and water pump flow. SANY recommends replacing the serpentine belt and inspecting all idler pulleys whenever the tensioner is changed. This complete front‑end service approach eliminates the risk of a second failure shortly after repair and maximizes the return on your maintenance investment.
The 60268440 tensioner is shipped with a temporary shipping pin that holds the arm in the relaxed position. Do not remove this pin until the tensioner is fully bolted to the engine. Removing the pin before installation can cause the arm to snap to its preloaded position, posing a safety risk and making installation difficult. Always discard the pin after the tensioner is secured.
The 60268440 continuously compensates for belt stretch and varying accessory loads. This ensures that the alternator, water pump, and A/C compressor always receive the mechanical power they require, without the efficiency losses caused by a slipping belt. The result is maximum electrical output, consistent cooling, and a comfortable cabin environment, regardless of engine speed or load.
Belt squeal, chirp, and flutter are completely eliminated by the 60268440’s calibrated damping system. The linear friction pad absorbs vibrations that would otherwise cause the belt to oscillate and generate noise. This not only improves driver comfort but also reduces stress on the belt and pulley bearings. A quiet engine bay is a sign of a healthy, well‑maintained accessory drive.
By maintaining correct tension and eliminating slip, the 60268440 dramatically reduces the frictional heat that degrades belt rubber. It also prevents the harmonic oscillations that cause premature wear of alternator and water pump bearings. Fleets using genuine SANY tensioners report belt life increases of 40% or more compared to operation with a worn or aftermarket tensioner.
The integrated visual wear indicator on the 60268440 arm removes all guesswork from maintenance planning. A quick glance during routine inspection tells you whether the tensioner still has usable travel. This early warning allows you to schedule replacement at your convenience, avoiding the downtime and potential collateral damage of a roadside belt failure.
Every 60268440 tensioner has passed SANY’s rigorous validation tests: 1.5 million dynamic cycles, 500‑hour salt spray, and extreme temperature cycling. This level of testing is never performed on generic aftermarket parts. When you choose the genuine 60268440, you are selecting a component with proven durability and reliability, directly traceable to the SANY engineering team.
A worn tensioner rarely fails without warning. Listen for a chirping or squealing noise from the front of the engine, especially during cold starts or when the A/C is engaged. This often indicates insufficient damping or a worn pivot bearing. Visually inspect the 60268440 tensioner with the engine off. Locate the wear indicator mark on the arm. If the arm is at or beyond this mark, the spring has lost its ability to maintain proper tension and the unit must be replaced immediately.
Excessive belt flutter – visible as a side‑to‑side wobble of the belt span – is another clear sign of inadequate damping. You may also notice that the belt has flipped or is riding off‑center on the pulleys. Physically check the tensioner by removing the belt and moving the arm through its travel. It should move smoothly with consistent resistance; any roughness, binding, or free play indicates internal damage. If you observe any of these symptoms, replace the 60268440 tensioner promptly to avoid a catastrophic failure.
The consequences of ignoring these warning signs are severe. A completely failed tensioner can seize, causing the belt to snap or be thrown off. This stops the water pump, leading to rapid engine overheating and potential head gasket or cylinder head damage. The belt can also become entangled with the cooling fan, damaging the radiator and hoses. The cost of repairing this secondary damage is many times greater than the price of a new genuine 60268440 tensioner. Proactive replacement is the definition of preventive maintenance.
The 60268440 Belt Tensioner is designed to be maintenance‑free, but its service life can be maximized through mindful operation and periodic inspection. Adhere to SANY’s recommended serpentine belt replacement intervals – a worn, glazed belt has higher friction and places additional load on the tensioner spring. Always use the exact belt specified for your engine; a belt with incorrect length or rib profile will alter the tensioner’s operating range and may cause premature wear. During each oil change, take 30 seconds to visually inspect the tensioner arm position and listen for bearing noise. If the truck operates in extremely dusty or corrosive environments (e.g., mining, coastal areas), increase inspection frequency.
Never apply any lubricant to the tensioner pivot or spring. The damping system relies on dry friction; oil or grease will destroy its effectiveness and cause belt slip. Keep the engine compartment free of oil and coolant leaks; these fluids can attack the tensioner’s rubber seals and degrade the damping pad. If you replace the tensioner, always install a new mounting bolt. The bolt may be a torque‑to‑yield design and should not be reused. Following these simple guidelines will help your 60268440 tensioner deliver reliable service for 80,000 to 100,000 miles in on‑highway applications and 4,000 to 5,000 hours in severe off‑road use.
At first glance, an aftermarket belt tensioner may appear similar and cost significantly less than the genuine SANY 60268440. This superficial similarity hides critical differences. Aftermarket units often use generic springs with incorrect load curves – too stiff, causing belt over‑tension and accelerated bearing wear; or too weak, allowing slip and reducing accessory performance.
Their damping systems are often crude friction washers that wear quickly and produce noise. The pulley may be made from mild steel that grooves after a few thousand miles, damaging the new belt. The pivot bearing may be an unsealed, single‑row design that fails rapidly when exposed to dust. There is no validation testing, no warranty support, and no engineering data.
The genuine SANY 60268440 is the product of millions of dollars in research and development. Its spring curve is matched to the exact inertia and accessory load profile of the D12C4.12.2‑2 engine. Its damping is tuned to eliminate resonant frequencies. Its bearing is specified for 10,000+ hours of continuous operation. Its pulley profile is an exact match to the belt.
When you choose the genuine 60268440, you are not just buying a part; you are buying the engineering knowledge, quality assurance, and reliability that keep your SANY truck on the job. For fleet managers who understand total cost of ownership, and for owner‑operators who depend on their equipment, the genuine 60268440 is not an expense – it is an investment in uptime and peace of mind.
How often should I replace the 60268440 tensioner?
SANY recommends inspecting the tensioner at every belt change. While there is no fixed mileage interval, the tensioner should be replaced when the wear indicator shows the arm is at or past the limit mark, or if any noise or roughness is detected. Many fleets proactively replace the tensioner with every second belt change to maximize reliability.
Can I reuse the old mounting bolt?
No. SANY engineering specifies that the mounting bolt should be replaced whenever the tensioner is changed. The bolt is often a torque‑to‑yield design and may stretch during initial installation. Reusing it can lead to incorrect clamp load and potential bolt failure. Always use a new, genuine SANY bolt.
Will a 60268440 from a different D12 engine fit my D12C4.12.2-2?
Not necessarily. Although many D12 tensioners look similar, the spring load, damping rate, and pulley offset are calibrated specifically for each engine variant. Using the wrong tensioner can cause belt misalignment, noise, and premature failure. Always verify the part number 60268440 against your engine serial number.
What causes a tensioner to fail prematurely?
The most common causes are oil or coolant contamination from engine leaks, which degrade the rubber seals and damping material; over‑tightened belts from incorrect installation; and using a low‑quality aftermarket belt with excessive friction. Maintaining a clean engine bay and using genuine SANY belts and tensioners is the best prevention.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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