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Type :
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starter
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Specification :
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24V 5.5KW
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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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M008T60071A
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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 24V 5.5KW starter motor is mainly adapted to heavy-duty diesel engines (e.g., commercial vehicle, construction machinery engines). Installation must strictly follow specifications to ensure performance and safety. The following are standardized installation steps and precautions:
Special tools: Torque wrench (range covering 50-300N·m), socket set (matching starter fixing bolts), terminal crimping tool, insulating tape/heat shrink tube;Auxiliary materials: Original-specification bolts (Grade 8.8 or higher), lock washers (combination of spring washers/flat washers), conductive paste (reducing terminal contact resistance), medium-strength thread locker (e.g., Loctite 243);Protective equipment: Insulating gloves, safety goggles, rags (for cleaning oil stains).
Starter motor body: Confirm model matching (5.5KW power, 24V voltage), check that the drive gear (one-way clutch) rotates smoothly without jamming, and the solenoid switch terminals are undamaged;Engine-side mounting surface: Clean oil stains and rust from the flywheel housing mounting holes, check that locating pins (if equipped) are intact, and the flywheel ring gear has no broken teeth or excessive wear;Electrical components: Battery voltage ≥24V (no-load), positive cable cross-section ≥16mm² (to meet high-current requirements), and ground wire connection is secure.
Align the starter’s drive end with the flywheel ring gear, insert 2-3 fixing bolts (with lock washers) into the flywheel housing mounting holes, and hand-tighten until fit, ensuring full contact (no gaps) between the starter mounting surface and flywheel housing.Note: Locating pins between the starter and flywheel housing must be accurately engaged (if designed with pins) to avoid uneven bolt stress from forced installation.
Tighten the fixing bolts diagonally with a torque wrench, following the engine manufacturer’s specifications for torque value (typically 80-120N·m, refer to the engine manual for details);After tightening, gently shake the starter to confirm no looseness. The meshing clearance between the drive gear and flywheel ring gear should be 0.5-1.5mm (check by prying the drive gear).
Fix the ground wire to the starter housing’s ground terminal (or directly to the engine block) with bolts, apply conductive paste to reduce contact resistance, and control torque at 30-50N·m;Ensure the ground wire cross-section ≥10mm², and the connection point is free of paint/rust (grind to bare metal).
Disconnect the battery positive terminal (to prevent short circuit), connect the battery positive cable to the solenoid switch’s main terminal (marked “+” or “B+”), add flat washers + spring washers, and torque to 40-60N·m;Secure the main cable firmly, keep it away from high-temperature engine components (e.g., exhaust pipe), and reserve appropriate length to prevent vibration-induced pulling.
Connect the control signal wire from the ignition switch/start relay to the solenoid switch’s auxiliary terminal (marked “S” or “50”), crimp the terminal securely, and wrap exposed parts with insulating tape;If the engine is equipped with a clutch switch/neutral switch, ensure the control circuit is only energized when the switch is closed (to prevent starting under load).
Mechanical inspection: Manually turn the crankshaft (by prying the flywheel ring gear) to confirm no interference or jamming between the starter drive gear and flywheel ring gear;Electrical inspection: Reconnect the battery positive terminal and measure the voltage between the starter main terminal and ground (should be close to 24V);No-load test: Turn the ignition switch to the start position – the starter should run smoothly, the drive gear should pop out without jamming, and there should be no abnormal noise (test duration ≤5 seconds to avoid overheating);Loaded test: Start the engine, observe that the starter runs with normal noise, the engine starts smoothly, and the drive gear retracts immediately when the ignition switch is released.
The following are key safety specifications, adaptability requirements, operation details and fault prevention points to focus on during the installation of a 24V 5.5KW starter motor, ensuring stable operation of the equipment after installation:
Disconnect the positive terminal of the battery throughout the installation process to prevent tools from touching the starter terminals and causing short circuits, sparks, or even damage to electrical components; if temporary power-on testing is required during installation, ensure hands are kept away from the drive gear and transmission components.
Do not operate when the engine is at high temperature (e.g., within 30 minutes of shutdown) to avoid scalding from high-temperature components such as the exhaust pipe and cylinder block.
Wear insulating gloves and safety goggles to prevent injury from slipping bolts or splashing oil; when disassembling/installing a heavy-duty starter (approximately 15-20kg), it is recommended to use supporting tools (e.g., jacks, slings) to avoid crushing injuries from manual handling.
The operation area must be kept away from flammable substances such as fuel and engine oil; clean up any leaks immediately; do not test the starter for an extended period in an enclosed space (e.g., garage) to prevent explosion of hydrogen gas generated by battery charging when exposed to sparks.
Confirm that the starter power (5.5KW) and voltage (24V) are consistent with the engine’s calibrated parameters to avoid burnout caused by a low-power starter driving a large-displacement engine, or damage to the engine flywheel ring gear due to overload from a high-power starter.
Check the parameters of the starter drive gear: the number of teeth and module of the ring gear must fully match those of the engine flywheel ring gear (common modules are 2.5-3.0, number of teeth 120-150); otherwise, meshing noise, tooth skipping or even gear breakage may occur.
Check that the bolt hole spacing and locating pin position of the starter mounting flange match the engine flywheel housing; do not forcibly ream holes or add gaskets to adjust the installation position, as this will cause the starter to skew and accelerate gear wear.
The cross-section of the main power cable must be ≥16mm², and the cross-section of the control circuit must be ≥1.5mm²; an excessively small wire diameter will cause excessive voltage drop and weak starting of the starter.
Use original-specification high-strength bolts of Grade 8.8 or higher for the fixing bolts, paired with lock washers (combination of spring washers + flat washers); do not replace them with ordinary bolts to prevent bolt loosening and falling off due to vibration.
Tighten the bolts step by step in a diagonal sequence (pre-tighten first, then tighten to the torque value), with the torque strictly following the engine manual (usually 80-120N·m); insufficient torque may cause loosening, while excessive torque may lead to thread stripping of the flywheel housing.
The meshing clearance between the drive gear and the flywheel ring gear must be controlled at 0.5-1.5mm; insufficient clearance may cause tooth jamming, and excessive clearance will result in large meshing impact; it can be checked by prying the drive gear or measuring the tooth tip clearance, and adjusting the gasket thickness if necessary.
References：
The content you previously viewed regarding the installation method and precautions for the 24V 5.5KW starter motor does not originate from a specific official manual or a single authoritative document. Instead, it is a standardized compilation based on the general installation specifications for starters adapted to heavy-duty diesel engines, integrated with common knowledge of starter installation within the automotive industry.
Its core basis derives from the universal operating guidelines in the automotive maintenance field and the starter disassembly, assembly, and maintenance knowledge released by professional automotive platforms such as Pacific Auto and Autohome. For example, key points mentioned in the content—such as disconnecting the battery power before installation, tightening bolts to the specified torque, and conducting a no-load test after installation—are consistent with the core starter installation specifications shared by these platforms. Additionally, it incorporates exclusive adaptability requirements for heavy-duty 24V starters used in commercial vehicles and construction machinery. Parameters like cable cross-sectional specifications and gear meshing clearance are supplemented as industry universal standards tailored to the characteristics of 5.5KW high-power starters, thereby forming a complete and practical installation guide.
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