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Type :
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Starter Motor
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Specification :
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24V 4.5KW
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Number of feet :
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11T
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Brand :
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nuojin
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Number :
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28100-78090
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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 installation of the Hino 24V 4.5KW starter motor must comply with safety regulations and follow the process of preparation, alignment & fixation, wiring connection, and testing. Meanwhile, attention should be paid to the installation details adapted to Hino vehicle models. The specific steps are as follows:
First, disconnect the negative cable of the vehicle battery to prevent short circuits or accidental startup during installation. Wear work gloves and safety goggles, and prepare suitable tools such as a socket wrench, torque wrench, screwdriver, high-temperature grease, and sandpaper. A rubber mallet can also be prepared for auxiliary installation; never use a hammer to avoid damaging components.
Confirm that the new starter motor is a model compatible with Hino. Check that its housing has no cracks or corrosion, the brushes are not excessively worn, the commutator surface is clean, and the solenoid switch responds normally. Then, clean the starter motor installation position at the connection between the engine and the transmission to remove oil stains, dust, and impurities. If the gasket at the old installation position is aged, replace it with a new one.
Fit the starter motor tightly to the mounting surface and align it with the mounting holes on the engine block. Ensure that the drive gear of the starter motor can mesh normally with the engine flywheel ring gear without component interference.
First, manually screw the fixing bolts into the mounting holes for positioning. Then, use a torque wrench to tighten them to the specified torque (referring to the torque standard for starter motors of similar commercial vehicles, usually approximately 37N・m). When tightening, adopt a symmetrical and step-by-step operation to prevent the starter motor from being installed crookedly.
Locate the main power terminal and the solenoid switch control terminal on the starter motor. First, connect the thick cable corresponding to the positive pole of the battery to the main power terminal, put on the protective cover, and tighten the fixing nut with a recommended torque of approximately 9.8N・m.
Then, connect the plug or terminal of the vehicle's start control circuit to the corresponding interface of the solenoid switch. Ensure that the plug is clamped tightly or the terminal is not loose to prevent startup failures caused by poor contact. When connecting the wires, distinguish between the terminals to avoid short circuits and damage to the starter motor due to wrong connection.
Reconnect the negative cable of the battery and fix it firmly. Then, insert the car key to start the engine, observe whether the starter motor operates smoothly, whether the drive gear can engage and disengage normally, and pay attention to any abnormal noise or vibration.
If the startup is normal, recheck whether all fixing bolts and wiring terminals are loose. If problems such as gear jamming or weak startup occur, immediately cut off the power supply to check the alignment of the installation position, the state of wiring connections, and the meshing of gears. Only after confirming that there are no problems can the test be conducted again.
To ensure installation safety, normal operation of the starter motor, and extended component service life, focus on the following 6 core categories of precautions, covering key aspects such as safe operation, component compatibility, installation accuracy, and wiring protection:
Before installation, the negative cable of the vehicle battery must be completely disconnected (for some vehicle models, the positive cable also needs to be disconnected simultaneously), and wait for 5-10 minutes to discharge residual charges in the circuit. This prevents short circuits, sparks caused by tools touching terminals during installation, and even damage to the starter motor’s solenoid switch or the vehicle’s ECU.
The starter motor’s drive gear and commutator are precision structures. During installation, never strike the main body or gear end directly with a hammer; if alignment is difficult, only use a rubber mallet to gently tap the edge of the starter motor housing for auxiliary alignment. This prevents deformation of the gear tooth surface and loosening of the brush holder.
Wear oil-resistant work gloves (to prevent hand oil from contaminating the starter motor’s wiring terminals, which may cause poor contact) and safety goggles (to prevent dust and metal debris from splashing into the eyes when cleaning the installation position). If it is necessary to handle residual oil on the old starter motor, non-slip gloves can be used together.
Before installation, recheck the starter motor model for the second time (it must match the engine model of the corresponding Hino vehicle, such as J08E, P11C, etc.). Ensure that the power (4.5KW), voltage (24V), installation hole spacing, and number of teeth on the drive gear are consistent with those of the original vehicle. This avoids gear meshing failure or installation position deformation due to incorrect installation.
New Starter Motor: Check that the housing has no cracks and the wiring terminals have no oxidation. Manually rotate the drive gear; it should rotate flexibly without jamming, and the solenoid switch terminals should not be loose. If it is a remanufactured part, additionally check the brush wear (the remaining length should not be less than 5mm) and ensure there are no ablation marks on the commutator surface.
Installation Position: Clean oil stains, rust, and residual old gaskets from the connection surface of the engine and transmission. If there is thread damage in the installation holes, repair it with a tap first (to prevent thread slipping when tightening bolts, which may cause the starter motor to loosen due to vibration during operation).
When fitting the starter motor to the mounting surface, visually check whether the axis of the drive gear is parallel to the axis of the flywheel ring gear. If there is deviation, adjust the angle of the starter motor until the gear can be naturally aligned with the ring gear. Forcibly screwing in bolts to "pull and align" is prohibited; otherwise, abnormal gear meshing clearance (normal clearance: 0.5-1.5mm) will occur, leading to gear jamming, abnormal noise during startup, and even wear of the flywheel ring gear.
Torque Standard: Fixing bolts must be tightened to the torque required by the Hino original maintenance manual (usually 35-40N・m; for specific values, refer to the engine maintenance manual of the corresponding vehicle model, e.g., the torque for the starter motor of Hino J08E series is 37±2N・m). Over-tightening by hand feel is prohibited to prevent bolt stretching deformation or installation surface cracking.
Tightening Sequence: If the starter motor is equipped with 2 fixing bolts, the "diagonal step-by-step tightening method" must be adopted (first screw the bolts until they fit, then tighten them step-by-step to the standard torque in 2-3 times in the order of "left to right/top to bottom"). This avoids deformation of the starter motor housing due to uneven force.
References：
The precautions for installing the Hino 24V 4.5KW starter motor you previously viewed do not come from a single specific official Hino original maintenance manual or a sole authoritative document. Instead, they are compiled and organized based on the general installation specifications for commercial vehicle starter motors, Hino engine-related maintenance materials, and universal standards in the automotive maintenance field. The specific reference bases are as follows:
The Hino engine maintenance manuals included in Yuanchuangli Documents (a Chinese document-sharing platform) mention the relevant installation specifications for starter motor mounting bolts and nuts. This provides a vehicle model adaptation-level reference basis for the content such as torque control and bolt fixation in the installation precautions.
Materials such as the starter motor operation manual from Doc88 (a Chinese document-sharing platform) and the starter motor disassembly, assembly and maintenance courseware from Yuanchuangli Documents clearly specify general requirements for starter motor installation, including cleaning the mounting surface before installation, ensuring firm wiring connections, and testing performance after installation. These serve as important references for the content related to component inspection and wiring protection in the installation precautions.
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