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Type :
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Starter Motor
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Specification :
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12V 3.8KW
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Number of feet :
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12T
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Brand :
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NUOJIN
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Number :
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QDJ1329D
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Quality :
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Remanufacture
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Delivery time :
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30 days
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The installation of the 12V 3.8KW starter equipped with the Luotuo 490 tractor must follow the general assembly logic for agricultural machinery starters and conform to the adaptation characteristics of the diesel engine of this model. The installation steps and related precautions are as follows. During operation, attention must be paid to safety and component compatibility:
Park the tractor on a flat and hard surface, and engage the handbrake to secure the vehicle body.
Turn off the engine, remove the key, and disconnect the negative cable of the battery to avoid the risk of short circuits or accidental startup during installation.
Wear work gloves and goggles at the same time to prevent hand injuries or foreign objects from splashing into the eyes.
Confirm that the new starter is a compatible model of 12V 3.8KW. Check that its housing has no cracks, the gear rotates smoothly, the carbon brushes have no excessive wear, and the solenoid switch engages normally.
Prepare compatible tools such as a socket wrench, torque wrench, and screwdriver. Meanwhile, prepare matching gaskets, nuts, and high-temperature resistant grease.
In addition, check whether the starter mounting surface and fixed bracket have oil stains or rust. If so, clean them with a cleaning agent.
Precisely align the mounting holes of the starter with the fixing holes on the engine flywheel housing, ensuring that the starter drive gear can smoothly mesh with the flywheel ring gear.
Avoid prying or forcing the starter during the fitting process to prevent deformation of the mounting surface or damage to the gear due to collision.
Insert the fixing bolts, and initially tighten them by turning them sequentially in a diagonal pattern.
Then use a torque wrench to tighten the bolts according to the general agricultural machinery standard (usually 25–35N·m; refer to the engine body marking if available) to ensure the starter is firmly installed and prevent loosening due to vibration during operation.
Locate the B+ terminal on the starter, and firmly connect the thick power cable led from the positive terminal of the battery to this terminal.
A flat washer and spring washer can be added at the terminal, and the nut tightening torque should be controlled at 10–15N·m to prevent heat generation caused by poor contact.
Accurately insert the S-terminal control wire plug corresponding to the starter on the tractor into the control terminal of the starter, ensuring the plug is clamped in place to avoid falling off.
This circuit is responsible for controlling the engagement of the solenoid switch; poor connection will cause the starter to fail to start.
Manually toggle the starter drive gear to check whether the meshing clearance between the gear and the flywheel ring gear is reasonable. Under normal conditions, the gear should move slightly without jamming.
If the clearance is abnormal, it can be corrected by adjusting the thickness of the gasket.
Recheck the tightening status of the bolts, and confirm that the wiring connections are free of looseness and entanglement, and that there is no interference with rotating components such as the tractor’s gearbox and pulley.
Apply a small amount of high-temperature resistant grease to the meshing area of the starter gear and the flywheel ring gear to improve the smoothness of operation.
Reconnect the negative cable of the battery and ensure the connection is firm.
Turn on the ignition switch and start the starter briefly. Observe whether there is abnormal noise during its operation and whether the drive gear engages and retracts quickly. If problems such as gear jamming or abnormal noise occur, cut off the power immediately for inspection.
Start the engine, and check whether the starter drives the flywheel to operate powerfully and whether the starter gear can retract in time after the engine starts.
Conduct multiple startup tests to confirm that there are no problems such as idling or poor meshing. At the same time, observe that the wiring connectors have no heat generation. If all is normal, the installation is completed.
Throughout the installation process, the negative battery cable must be disconnected. After disconnection, release residual electricity by pressing the tractor’s horn, turning on the lights, or other means. This prevents short-circuit sparks caused by tools accidentally touching the wires, avoiding damage to the starter’s solenoid switch or the battery .
Never use a starter that does not meet the 12V 3.8KW specification. Verify that the mounting hole spacing of the starter and the number of teeth on the drive gear match the flywheel ring gear of the Luotuo 490. Typically, the number of teeth on the flywheel ring gear must correspond to that of the starter gear, with a deviation not exceeding ±1 tooth. Mismatched accessories will cause gear meshing failure or starter power mismatch, leading to component damage.
Use wrenches and sockets with intact insulated handles (to avoid direct short-circuiting of terminals by metal tools). Meanwhile, wear non-slip work gloves and goggles. The installation space of the tractor is relatively compact, so these protections prevent hand scratches from sharp edges of the engine body and avoid oil stains or metal debris splashing into the eyes.
Before installation, thoroughly clean oil stains, rust, and residual old gaskets from the mounting surface of the engine flywheel housing and the fitting surface of the starter. If the mounting surface is deformed or has protrusions, polish it smooth with fine sandpaper. An uneven surface will cause the starter to be installed at an angle, leading to meshing deviations between the drive gear and the flywheel ring gear and accelerating gear wear .
The fixing bolts must be agricultural machinery-specific high-tensile bolts (usually Grade 8.8) ; never replace them with ordinary bolts. When tightening, strictly follow the principle of "diagonal sequential tightening," and control the final torque to 25–35N·m (refer to the engine body marking for specifics). Loose bolts will cause the starter to vibrate and shift during operation, while over-tightening may lead to bolt breakage or cracking of the mounting surface.
After installation, always check the meshing clearance between the drive gear and the flywheel ring gear (normal clearance: 0.5–1.5mm). Excessively small clearance will cause hard friction and abnormal noise between gears; excessively large clearance will result in a "gear collision" phenomenon. The clearance can be adjusted by adding or removing adjustment gaskets (usually 0.3–1mm thick) between the starter and the flywheel housing until the gear can be toggled manually without jamming or obvious looseness .
References：
The content regarding the installation method and precautions for the 12V 3.8KW starter of Luotuo 490 you obtained earlier does not originate from an exclusive official repair manual of Luoyang Tractor or a single authoritative document. Instead, it is organized and compiled by integrating general specifications for agricultural machinery maintenance, industry standards for starter disassembly and assembly, and relevant agricultural machinery technical sharing content. The specific reference directions are as follows:
Materials such as starter disassembly, assembly and maintenance courseware on Original Power Documents, and starter disassembly steps published on Autohome clearly specify general safety requirements for starter installation. These include disconnecting the negative battery terminal before installation , conducting inching tests after installation, and avoiding long-term no-load operation. They also mention key points for accessory inspection, such as checking carbon brush wear and gear meshing status . These requirements are consistent with the core logic of pre-installation preparation and test commissioning in the content. In addition, details such as terminal fastening and wire anti-interference handling also comply with the standard requirements for electrical connections in such general specifications .
The assembly tutorial for agricultural 490 diesel engines published on NetEase details the assembly torque and clearance requirements for components such as the flywheel and gear chamber of 490 diesel engines. This provides agricultural machinery-compatible reference bases for parameters in the content, including the 25–35N·m tightening torque for starter fixing bolts and gear meshing clearance calibration . These references ensure that the installation parameters align with the diesel engine body characteristics corresponding to the Luotuo 490.
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