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Type :
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Starter Motor
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Specification :
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24V 4.0KW
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Number of feet :
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9T 11T
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Brand :
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NUOJIN
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Number :
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0001231014
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Quality :
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NEW
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Delivery time :
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10DAY
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The Volvo 24V 4.0KW starter is mostly suitable for the brand’s heavy-duty vehicles or construction machinery. Its installation must conform to the characteristics of high-power components, while complying with the electrical and mechanical assembly specifications of Volvo models. The overall process is performed in the reverse order of disassembly, with specific installation methods and precautions detailed as follows:
First, turn off the ignition switch and disconnect the negative terminal cable of the battery to prevent circuit short circuits that could damage the starter or vehicle electronic control unit (ECU) during installation. If the vehicle is equipped with a live junction box, the junction box bracket must be additionally removed. After the engine has completely cooled down, use lifting equipment to adjust the vehicle posture to ensure sufficient working space in the starter installation area. Meanwhile, lay protective pads around the engine compartment to avoid scratches on the vehicle body or components caused by falling parts.
Confirm that the model of the new 24V 4.0KW starter is compatible with the corresponding Volvo vehicle model. Inspect the starter’s core components such as the DC motor, transmission mechanism and solenoid switch for no damage; ensure that the gears are free of tooth chipping and the carbon brushes are not excessively worn. Prepare suitable tools including socket wrenches, torque wrenches and special tools for wiring harness fixation. Meanwhile, check the completeness of accessories removed during disassembly, such as insulating bushings and the plastic plate between the starter motor and the engine.
Wipe the mounting surface at the connection between the engine and the starter with thoroughly wrung-out cotton yarn soaked in a special cleaning agent. Completely remove oil stains, rust and metal debris; at the same time, clean residual impurities in the mounting holes to prevent bolt loosening or vibration during starter operation caused by impurities.
Place the new starter smoothly into the mounting seat, ensuring that the starter drive gear faces the flywheel ring gear side. Observe the alignment between the gear and the flywheel ring gear to ensure smooth meshing in subsequent operations. If there is an alignment deviation, fine-tune it by adjusting the installation angle—do not tap or force the alignment. Meanwhile, confirm that the plastic plate between the starter and the engine is installed in place to avoid affecting sealing performance and installation accuracy.
Initially fasten the starter assembly with three fixing bolts, then use a torque wrench to tighten the bolts to a torque of 45±5N·m in accordance with the standards for this type of high-power starter. This torque can not only ensure a firm connection between the starter and the engine, but also avoid cracking of the starter housing or the engine connection part due to excessive torque.
First, reconnect the heavy-duty cables and light-duty cables removed from the starter to the positive and negative terminals respectively, paying attention to distinguishing cable specifications and never reversing the polarity. Then connect the wiring harness terminal of the control relay and ensure that the plug is fully locked. Among them, the terminal B wiring harness must be arranged vertically upward, and the tightening torque of its nut should be controlled at 12±2N·m to prevent terminal breakage caused by improper torque. After connection, check whether the insulating bushing is properly positioned under the nut, then install the live junction box bracket, organize the wiring harness routing, and avoid friction with surrounding moving parts.
Reinstall the previously removed components such as the battery, battery pressure plate, hook, as well as the battery lower cover and gaskets in the reverse order of disassembly. After installing the battery cover, shake it left and right to check whether the limit structure is installed in place. At the same time, organize the pipelines in the engine compartment and fix them properly to avoid interference with starter operation.
Reconnect the negative battery cable; clean the terminal to remove oxides before connection to ensure good contact. Then conduct a startup test: turn the ignition switch and observe whether the starter can rapidly drive the flywheel to rotate without abnormal noise or jamming. The duration of each startup connection shall not exceed 5 seconds; if the startup fails three times in a row, troubleshooting is required. After the engine starts, check whether the drive gear can disengage from the ring gear in a timely manner. If problems such as weak starting or abnormal gear meshing noise occur, stop the engine and disconnect the power supply immediately for troubleshooting—do not attempt repeated startups to prevent further expansion of faults.
For the installation of the Volvo 24V 4.0KW starter, it is necessary to combine the characteristics of its high-power adaptation to heavy-duty vehicles/construction machinery and strictly follow the following precautions to ensure installation safety, equipment stability, and the reliability of the entire vehicle's electrical system:
Before installation, in addition to disconnecting the negative battery terminal, if the vehicle is equipped with a live junction box, the junction box bracket must be additionally removed to completely cut off the power supply of the starter-related circuits. The electronic control system of Volvo heavy-duty models is sensitive to voltage fluctuations—live plugging/unplugging of wiring harnesses or mechanical connection operations are strictly prohibited to prevent short circuits from burning the starter solenoid switch, the entire vehicle's ECU, or damaging relays .
The mounting surface must be thoroughly cleaned with cotton yarn soaked in a special cleaning agent to remove oil stains, rust, metal debris, and sealant residues. The mounting holes must be free of impurity blockages. High-power starters generate significant vibration and impact during operation; residual impurities can cause bolt loosening, meshing clearance deviation, and lead to tooth surface wear or housing cracking.
When placing the starter into the mounting seat, ensure the drive gear faces the flywheel ring gear side, and the plastic sealing plate is accurately inserted into the positioning groove of the mounting surface. Forcing alignment by tapping the housing is strictly prohibited. If there is an alignment deviation, fine-tune the installation angle or check for plastic plate deformation—do not pry the starter body with metal tools.
References：
The previously provided precautions for installing the Volvo 24V 4.0KW starter are not derived from a specific official Volvo original technical manual or exclusive documentation from a particular platform. Instead, they are technical content compiled by integrating universal high-power starter installation specifications in the automotive maintenance industry with the structural and electrical system characteristics of Volvo heavy-duty vehicles/construction machinery. Their core basis can be referenced in industry-general maintenance materials and relevant automotive maintenance common sense, with specific explanations as follows:
Content such as "prioritize disconnecting the negative battery terminal before installation", "strictly prohibit live operations to prevent burning the electronic control unit", and "single startup test connection time shall not exceed 5 seconds" is consistent with the core safety guidelines emphasized in the starter disassembly and assembly precautions published by Autohome, including power-off protection and startup duration limitations .
The requirement of "forbidding rough knocking or prying during assembly; applying high-temperature resistant grease to assist installation if components fit too tightly" also complies with the universal taboos in the industry for protecting component structures during starter assembly .
Although there is no publicly available exclusive original factory data for Volvo this model, the tightening torques specified—45±5N·m for the starter fixing bolts and 12±2N·m for the terminal B wiring harness nut—are close to the 35-45Nm torque range used for installing related starters of brands such as SAIC. They fall within the common torque interval suitable for high-power starters.
Meanwhile, the inspection requirements for core components of the starter, such as the DC motor, transmission gear, and carbon brushes, are also universal inspection dimensions in the automotive maintenance industry for judging starter eligibility .
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