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Type :
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starter
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Specification :
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12V 1.2KW
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Number of feet :
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9T
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Brand :
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nuojin
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Number :
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4G24-3708020E
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Quality :
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Remanufacture
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Delivery time :
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10 day
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The 12V 1.2KW starter is mainly compatible with King Long's buses and other models. Its installation process follows the same logic as general automotive starter installation, while special attention should be paid to the assembly characteristics of commercial vehicle components. Below is a detailed installation method compiled in accordance with universal industry standards:
Prepare tools including a 12mm box-end wrench, torque wrench, 8mm socket, Phillips screwdriver, etc.; confirm that the new starter model is 12V 1.2KW, check for no external damage, ensure core components such as the armature and one-way clutch are intact, and verify that no accessories are missing.
Park the King Long vehicle on a level surface, engage the handbrake, and secure the wheels with wheel chocks.
Turn off the ignition switch, remove the key, disconnect the negative battery terminal cable, and wait 5-10 minutes for the vehicle's capacitors to discharge to avoid short circuits that could damage electronic components during installation.
First, remove the protective cover (if any) around the starter, sort out the starter's wiring connections, use a wrench to loosen and remove the wire fixing nuts on the terminals, and pull out the control terminal connector. Be sure to mark the wire positions to avoid incorrect connection later.
Use a socket or wrench to remove the two long fixing bolts of the starter, then smoothly take out the old starter. If the old starter is stuck to the mounting surface, gently tap the edge with a rubber mallet to separate it—do not strike violently.
Use a special cleaning agent to remove oil, rust, and sealant residues from the mounting surface at the junction of the engine and the starter to ensure the surface is flat. Meanwhile, check for damage to surrounding wiring harnesses and pipelines; repair any damage in advance if found.
First, connect the starter's B+ terminal (thick power wire), then insert the control terminal connector, and then connect terminal 30 with a nut, controlling the torque to 9.8N·m.
Next, install the wiring harness bracket, tighten the bolts to a torque of 8.4N·m, and secure 2 wiring harness clips to prevent wire damage from friction during engine operation. Finally, close the terminal cover.
If there is oxidation on the wire connectors, apply a small amount of conductive paste to prevent rust.
Reconnect the negative battery terminal cable, turn the ignition switch to the start position, and test the starter's operation. Observe whether the starter can drive the engine to start normally, if the gear retracts smoothly after startup, and if there are any abnormalities such as unusual noises or jamming.
If the startup is weak, it may be due to loose wiring connections; if there is no response at all, check whether the control terminal connector is fully inserted or if the fuse is blown. After troubleshooting and resolving the issue, retest—if the startup is normal, the installation is complete.
Considering the characteristics of the King Long 12V 1.2KW starter adapted for commercial vehicles, as well as the universal safety and technical specifications for starter installation, the installation precautions can be elaborated from four aspects: safety protection, component and operation protection, wiring and torque control, and testing and troubleshooting. The specific details are as follows:
It is imperative to disconnect the negative battery terminal first throughout the entire process and wait 5 - 10 minutes for the capacitors to discharge fully. This is crucial to avoid short circuits of electronic components and electric shocks to operators during installation. When reconnecting the power supply after installation, ensure there are no tools touching the circuits nearby to prevent accidental short circuits.
The vehicle must be parked on a flat surface. Engage the handbrake and use wheel chocks to secure the wheels, eliminating the risk of the vehicle sliding during installation. Operators should wear insulating gloves and safety goggles. This not only prevents oil stains from splashing into the eyes but also avoids electric shocks when touching the circuits, and at the same time prevents injuries to both the components and themselves caused by falling tools.
Do not disassemble the new starter before installation, so as to avoid precision components such as the armature and one-way clutch getting contaminated with dust and oil stains. If there are stains on the surface, only wipe it gently with gasoline-soaked cotton yarn that has been wrung out. Never clean it with water or detergents, nor blow the internal parts with high-pressure air. If the starter fits too tightly during installation, gently tap the edge with a rubber mallet for alignment. Violent striking is strictly prohibited, as it may lead to housing deformation and gear shaft bending.
When removing and installing the protective cover, avoid prying the surrounding pipelines and wiring harnesses. When reinstalling the components, check whether any pipelines or wiring harnesses are stuck between the starter and the mounting surface. This is to prevent component wear or starter jamming when the engine is running.
The bolts fixing the starter should be tightened to a torque of 37N·m. The nut for terminal 30 and the bolts for the wiring harness bracket should be tightened to 9.8N·m and 8.4N·m respectively. Insufficient torque will cause component loosening and vibration, while excessive torque may damage the bolt threads or the starter housing. In addition, it is forbidden to replace the original bolts with bolts of other specifications.
Strictly follow the wiring sequence of "connect the B+ terminal first → then plug in the control connector → finally connect terminal 30", and the sequence must not be reversed. Inspect the connectors before connection; if there is oxidation, apply conductive paste on them. The wiring harness clips must be fixed firmly to prevent the wires from rubbing against other components when the engine is running, which could result in insulation layer damage and short circuits.
References：
The precautions for installing the King Long 12V 1.2KW starter are not derived from a single authoritative document or specific technical bulletin exclusively issued by King Long. Instead, they are comprehensively compiled by integrating the universal installation specifications for commercial vehicle starters, the general operating guidelines in the automobile maintenance industry, and the assembly characteristics of King Long models compatible with this type of starter. The reference bases for the core information can be divided into the following categories:
The basic requirements in general automobile maintenance guides—such as the key points for universal starter installation published on
Hexun.com—serve as an important foundation for compiling these precautions. These requirements include disconnecting the negative battery terminal before installation, cleaning the mounting surface, tightening bolts to the specified torque, and testing the operating status after installation. For instance, the core principles like disconnecting power to prevent short circuits and avoiding violent disassembly of components are highly consistent with the content related to safety protection and component protection in the precautions.
The consensus on assembling electrical components like starters in the automobile maintenance field strongly supports the content of these precautions. Operational taboos, which are accumulated general experience in the automobile maintenance industry over a long period, are applicable to the installation scenarios of starters for most models including King Long buses. Examples of such taboos are following a specific sequence for wiring connections, applying conductive paste to corroded connectors to prevent rust, and using a rubber mallet for auxiliary alignment instead of striking violently.
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