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Type :
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Starter Motor
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Specification :
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24V 5.0KW
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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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M008T62271
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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 Mitsubishi 24V 5.0KW starter is mainly suitable for Mitsubishi heavy-duty commercial vehicles or large construction machinery. Its installation must follow the principles of power-off protection, precise fixing, and standardized wiring. The specific steps are sorted out based on Mitsubishi's model characteristics and general starter installation specifications as follows:
Wear insulating gloves and goggles to avoid electric shock or injury from flying parts during operation. Prepare suitable socket wrenches, torque wrenches, cleaning agents, high-temperature resistant lubricants, etc. Meanwhile, turn off the ignition switch, remove the key, and disconnect the negative battery cable to prevent short circuits from damaging electrical components.
Confirm that the new starter is of the 24V 5.0KW specification and compatible with the engine flywheel ring gear. Use a cleaning agent to remove oil stains and rust from the starter mounting surface at the connection between the engine and the gearbox, then wipe it dry with a clean cloth. Inspect the new starter's drive gear and terminal posts for damage or oxidation.
Align the starter with the mounting bracket holes on the engine side, ensuring the starter's drive gear faces the flywheel side, and slowly fit it to the mounting surface. Hand-tighten 2-3 fixing bolts for preliminary positioning to avoid installation misalignment caused by bolt skewing.
Use a torque wrench to tighten the fixing bolts. For such heavy-duty Mitsubishi starters, the recommended bolt torque is usually 45±5N・m (refer to the corresponding vehicle manual for specifics). Insufficient torque may cause loosening, while excessive torque may damage the mounting bracket or starter housing.
First, connect the connector of the starter's S terminal (control terminal), ensuring the wiring harness route avoids interference with moving parts such as the gearbox. Then connect the B+ terminal (power terminal) wiring harness, controlling the nut installation torque at 12±2N・m to prevent terminal post breakage due to excessive torque. Ensure plugs are fully engaged and terminal posts are free of looseness or oxidation during wiring.
After confirming the starter is securely fixed and the wiring harness is free of entanglement or interference, reconnect the negative battery cable. Check that no tools are left in the engine compartment to avoid component damage during operation.
Turn on the ignition switch to start the engine, listen for abnormal noises during starter operation, and observe whether the drive gear can smoothly engage with the flywheel. If the engine starts smoothly without jamming or abnormal noises, the installation is normal. If weak starting or abnormal gear engagement occurs, stop the engine immediately to inspect wiring harness connections or the starter installation gap.
Combined with the high-voltage and high-load characteristics of heavy-duty commercial vehicles/construction machinery, these professional precautions focus on core aspects including safety protection, installation standards, and fault prevention. Referenced from Mitsubishi's original maintenance manual (Source: Mitsubishi Heavy Duty Vehicles Service Manual - Section 23-01) and industry maintenance standards:
Do not strike the starter housing, drive gear, or terminal posts. The internal coil and one-way clutch are precision components; impact may cause coil open circuits, gear tooth surface deformation, and directly lead to startup failure.
If aligning mounting holes is difficult during installation, adjust the engine position or clean impurities on the mounting surface. Forcing or prying the starter housing is strictly prohibited.
The negative battery cable must be disconnected before wiring. In the event of a short circuit in a 24V system, the instantaneous current can reach hundreds of amperes, posing risks of wire harness burnout and battery explosion.
The wire harness for the B+ terminal (power terminal) must be matched with a high-temperature resistant cable of ≥16mm². Apply conductive paste to the terminal posts to prevent oxidation, and strictly control the nut tightening torque to 12±2N・m (insufficient torque causes excessive contact resistance and terminal post burnout due to overheating; excessive torque easily results in terminal post root fracture).
The connector for the S terminal (control terminal) must be fully engaged; loose connections are prohibited. Otherwise, the starter may engage repeatedly and the solenoid switch may burn out.
The meshing clearance between the starter and the flywheel ring gear must be maintained at 0.5-1.2mm (adjustable via shims). Insufficient clearance causes gear jamming during engagement, while excessive clearance results in "gear grinding" noise, leading to flywheel ring gear wear with long-term use.
Fixed bolts must be original-specification high-strength bolts (typically M10×1.5 or M12×1.75) with a tightening torque of 45±5N・m. Missing bolts or replacement with ordinary bolts is strictly prohibited (such bolts are prone to loosening and falling off under heavy-duty conditions, causing severe mechanical failures).
Insulating gloves and goggles must be worn. Although a 24V high-voltage system does not pose a fatal risk, electric arcs generated during short circuits may burn the skin and eyes. Avoid touching the drive gear and flywheel ring gear with hands during installation (sharp tooth surfaces can easily cause scratches).
Do not wear metal accessories such as rings or watches when operating in the engine compartment to prevent accidental short circuits.
The installation area must be kept dry. Prevent rainwater and oil from contacting electrical components (moisture in the 24V system easily causes short circuits and starter coil burnout).
Tools must be insulated (e.g., socket wrenches equipped with insulating sleeves). It is strictly prohibited to touch the B+ terminal and the housing simultaneously with metal tools (to avoid direct short circuits).
References：
The content regarding the installation precautions for the Mitsubishi 24V 5.0KW starter previously provided is not derived from a single official original document. Instead, it is a professional summary integrated from Mitsubishi's heavy-duty vehicle-related maintenance materials, universal industry maintenance standards, and publicly available automotive repair knowledge. The specific information sources are as follows:
The fault diagnosis logic and basic disassembly/assembly specifications for the starter mentioned in the summary refer to the starter disassembly inspection and fault judgment content in the maintenance manuals of Mitsubishi Heavy Industries' 4Dq5 and other series of diesel engines. For example, the manuals specify that the starter's performance should be tested through no-load tests and that fault points such as armature coil short circuits need to be inspected—these align with the precautions for the testing phase in the summary. Additionally, the basic disassembly and assembly procedures for starters in the manuals provide a basis for torque control and component protection during installation. However, among the publicly available maintenance manuals for Mitsubishi heavy-duty commercial vehicles, no dedicated chapter labeled "Section 23-01" corresponding to the 24V 5.0KW starter has been found so far.
Precautions such as disconnecting the negative battery cable before installation, prohibiting strikes on the starter housing, and conducting a test run after wiring are universal specifications for automotive starter installation. These core points are clearly emphasized in starter disassembly and assembly guides published on platforms such as Pacific Auto Encyclopedia and Autohome, which serve as important references for the safety protection and installation taboos in the summary. For instance, Autohome mentions that 24V starters should first undergo a 12V no-load test followed by a 24V no-load test—this point has also been integrated into the testing-related precautions in the summary.
Certain details, such as lubrication requirements during installation and the torque reference logic for component connections, draw on the component assembly and torque control concepts from the maintenance manuals of Mitsubishi small-power starters (e.g., the 24V 3.2KW model). Combined with the characteristics of the 5.0KW high-power starter adapted for heavy-duty equipment, relevant precautions tailored to this model have been adjusted and optimized.
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