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Type :
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AIternator
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Specification :
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28V 70A
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Pulley :
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B85 1PK
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Brand :
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nuojin
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Number :
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JFZ276C8 JFZ2711
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Quality :
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Remanufacture
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Delivery time :
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10DAY
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The 28V generators used in JAC vehicles are mostly applied to its commercial vehicles or some special-purpose models. The installation idea is consistent with that of JAC's common 12V generators, with the core following the reverse process of removing the old unit. Meanwhile, it needs to adapt to the special requirements of the 28V high-voltage electrical system. The specific installation methods are as follows:
Tools and Accessories: Prepare a 28V original generator suitable for the corresponding JAC model, as well as sockets, wrenches, and special belt tensioner tools of corresponding specifications. If the terminals are rusted, sandpaper should be prepared. Also, check parameters such as the generator's power and mounting hole positions to ensure they match the vehicle.
Vehicle Protection: Park the vehicle on a flat surface and pull the handbrake tightly, then open the engine compartment. Be sure to disconnect the negative battery cable with a wrench. The 28V system has a higher risk of short circuits, and this step can prevent electrical components from being damaged by short circuits. If the generator is in a hidden position, it is necessary to remove accessories such as the bottom guard plate. After removal, securely support the vehicle with a bracket and clean up oil stains and debris in the installation area.
Carefully place the new 28V generator in the original installation position, and accurately align it with the fixing bolt holes on the generator body. Hand-tighten the fixing bolts for initial fixation, and do not tighten them completely for the time being to reserve adjustment space for the subsequent installation of the drive belt. Handle with care during transportation and placement to avoid bumping the generator housing and damaging internal precision components.
If there is rust or oxide layer on the terminals, first polish them clean with sandpaper to ensure good circuit conduction. Find the B+ terminal and other signal interfaces of the generator, and connect the power cables and signal wires according to the wiring marks of the old generator. The positive and negative poles of the 28V system must not be reversed, otherwise, it is easy to burn out the regulator and vehicle electrical modules. Control the tightening torque of the terminal nuts within an appropriate range, ensure that the plugs are fully inserted and locked in place, and arrange the wiring harness to avoid entanglement or contact with high-temperature components.
Use a special tool to pry the belt tensioner to compress its spring, keep this state, and accurately put the drive belt on the generator pulley, ensuring that the belt is completely aligned with the pulley grooves on the engine side. Slowly release the tensioner to allow the belt to naturally fit into the grooves, then check the belt tension. It is appropriate that the belt sinks 1-2 centimeters when pressed. Excessively loose tension will cause slipping and ineffective transmission, while excessively tight tension will accelerate the wear of the generator bearings and affect service life.
Use a socket to thoroughly tighten the fixing bolts of the generator one by one. Refer to JAC vehicle maintenance specifications, and the bolt tightening torque is recommended to comply with the vehicle's calibrated standards to prevent vibration during generator operation. After tightening, reinstall the previously removed accessories such as the bottom guard plate in sequence, and tighten all fixing screws to prevent accessories from falling off during driving.
Reconnect and tighten the negative battery cable. After starting the vehicle, observe whether the charging fault light on the instrument panel goes off. Use a multimeter to detect the output voltage of the generator. Under normal working conditions, the output voltage of the 28V generator should meet the corresponding standard range. At the same time, pay attention to any abnormal noise around the generator when the engine is running. If there are abnormal sounds such as belt slipping or metal friction, stop the vehicle immediately to check issues such as belt tension or generator installation position. The installation work is only completed after confirming that there are no abnormalities.
The 28V generators of JAC (Jianghuai) are mostly adapted for its commercial vehicles or some special-purpose models. Their installation precautions must take into account the characteristics of high-voltage electrical systems, mechanical assembly specifications, and vehicle adaptation requirements. The following is sorted out from four core dimensions: safe operation, installation specifications, adaptation details, and fault troubleshooting to avoid equipment damage and electrical abnormalities. Specifics are as follows:
Complete Power Off to Prevent Short Circuits: Before installation, be sure to turn off the engine and disconnect the negative battery terminal. Since the 28V system voltage is higher than the conventional 12V, live operation will result in a higher risk of short circuits and equipment burnout. Power is strictly prohibited during the entire installation process until the wiring is verified to be correct.
Avoid High-Temperature and Mechanical Risks: Keep away from high-temperature components such as the engine exhaust manifold during operation to prevent burns. Stay clear of rotating parts like pulleys and cooling fans to avoid bodily entanglement. If the bottom guard plate needs to be removed, use professional brackets to securely support the vehicle—never operate with only a jack for support.
Handle with Care to Prevent Component Damage: Avoid collision or dropping when transporting the generator. Do not forcefully pry the housing or strike the bearings. Its internal precision components such as coils and rectifiers are sensitive to impact, and violent operations may easily cause internal open circuits or bearing jamming.
- References：
The previously provided precautions for installing the JAC 28V generator are not derived from a single official JAC maintenance manual or a dedicated document. Instead, they are compiled by integrating specialized maintenance experience of JAC vehicle models and general installation specifications for automotive generators. The specific reference bases are as follows:
Multiple generator maintenance documents related to JAC models (such as JAC trucks, JAC Ruiling pickup trucks, JAC Refine commercial vehicles, etc.) released on the Motormaster platform serve as important references. These documents repeatedly emphasize core key points, including disconnecting the power supply before installation to prevent electric shock, ensuring the generator matches the vehicle model, handling with care during disassembly and assembly to avoid colliding with surrounding parts, and inspecting wires for damage and short circuits. These points provide a basis for the model compatibility and basic safety operations in the installation of the JAC 28V generator. Among them, the installation instructions for Weichai generators installed on JAC trucks also mention basic installation specifications such as bolt tightening and secure wire connection, further supplementing practical operation details.
The general installation procedures and precautions for automotive generators published on Autohome and PCauto offer crucial support. For instance, both Autohome and PCauto note the need to clean dust and oil from the installation area before installation, adjust the drive belt tension to an appropriate level, and initially fasten bolts before final tightening after fine adjustments. Autohome also adds details such as checking the operating condition of bearings after generator installation and avoiding bearing damage caused by an overly tight belt. These general specifications refine the specific operational requirements for belt adjustment and component fastening during the installation of the JAC 28V generator.
Based on the characteristic that the 28V voltage is higher than that of conventional 12V automotive generators, exclusive precautions related to high voltage have been developed. For example, the requirement of "completely cutting off power to prevent short circuits" is emphasized. This is because live operations in a high-voltage environment carry a higher risk of short circuits and equipment burnout. Derived from the general safety principles for high-voltage electrical equipment installation, this targeted supplement is tailored for the installation of high-voltage generators like the JAC 28V type, ensuring the safety of both equipment and personnel during the installation process.
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