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Type :
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starter
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Specification :
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24V 9KW
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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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five million six hundred and twelve thousand nine hundred and one
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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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Necessary tools: Torque wrench (matching the specification of starter fixing bolts), socket wrench, Phillips/flathead screwdriver, wire crimping tool, insulating tape, multimeter, pry bar (for auxiliary positioning).
Auxiliary materials: New starter assembly (confirm model compatibility with excavator engine, e.g., Cummins, Isuzu, etc.), copper wiring terminals, high-temperature resistant sealant (required for sealing housing gaps in some models), lock washers (spring washers or lock nuts), cleaning cloth, rust remover (for treating rust on bolt holes or contact surfaces).
Disconnect the negative cable of the excavator battery (to avoid short circuit and ablation of circuits), and wait for 5-10 minutes to release residual electricity in the circuit.
Clean the starter installation area (at the engine flywheel housing), remove dust, oil stains and rust, check the flatness of the flywheel housing mounting surface, and correct if deformed.
Verify starter parameters: Confirm voltage (24V), power (9KW), and match with the modulus and number of teeth of the engine flywheel ring gear (to avoid meshing noise or failure to drive).
Mark the wiring connection positions: Use a marker to mark the connection terminals of the power cable (thick wire) and electromagnetic switch control wire (thin wire) on the starter to avoid wrong connection during installation.
Remove the wiring: First remove the electromagnetic switch control wire (thin wire, usually fixed by blade terminal or small bolt), then remove the positive battery power cable (thick cable, generally M8/M10 bolt), and wrap the exposed wire ends with insulating tape to prevent short circuit.
Remove the fixing bolts: The starter is usually fixed on the flywheel housing by 2-3 main fixing bolts. Loosen the bolts diagonally with a torque wrench, remove the bolts and washers, then pull out the old starter smoothly from the flywheel housing (take care not to collide with the flywheel ring gear).
Clean the installation position: Clean the bolt holes and dowel pin holes on the flywheel housing with rust remover, wipe the mounting surface with a cleaning cloth, and check if the dowel pins are intact (replace if missing).
Align the drive gear end of the new starter with the mounting hole of the flywheel housing, push in slowly to ensure the starter housing fits the flywheel housing mounting surface (no gaps), and check the meshing clearance between the drive gear and flywheel ring gear (normal clearance is 2-4mm, adjustable by gaskets, some models are non-adjustable).
If equipped with dowel pins, insert the dowel pins into the positioning holes of the flywheel housing first, then fit the starter housing (to ensure installation coaxiality and avoid gear eccentric wear).
Put in the fixing bolts and lock washers, screw in the bolts by hand until they fit the housing (to avoid thread misalignment and slipping), then tighten diagonally with a torque wrench:Bolt specifications are usually M10-M12, and the torque value refers to the excavator manual (generally 35-45N·m, subject to specific models). Over-tightening is strictly prohibited to prevent housing cracking.
After tightening, shake the starter to confirm no looseness (the housing and flywheel housing are tightly fitted with no gaps).
First connect the positive battery power cable: Slide the thick cable terminal onto the main terminal (marked “+” or “B+”) of the starter electromagnetic switch, put on the flat washer and lock nut, and tighten with a torque wrench (torque 8-12N·m to avoid terminal overheating or looseness).
Then connect the electromagnetic switch control wire: Connect the thin wire terminal to the auxiliary terminal (marked “S” or “IGN”) of the electromagnetic switch, tighten the fixing bolt (torque 3-5N·m) to ensure the wiring is firm (to avoid falling off due to vibration).
Check the circuits: Confirm no exposed copper wires at all wiring terminals, wrap loose parts with insulating tape, and arrange the circuits away from high-temperature engine components (e.g., exhaust pipe) and moving parts (e.g., flywheel, pulley).
Some excavator starters are equipped with dust covers or heat shields, which should be installed in their original positions and fixed with buckles or bolts (to prevent dust from entering the gear meshing surface or the starter coil from being baked by the high temperature of the exhaust pipe).
Connect the negative battery cable, tighten the fixing nut (torque 10-15N·m), and check the whole vehicle circuit for short circuits (measure the resistance between the positive and negative poles of the battery with a multimeter, no abnormal conduction).
Turn on the excavator ignition switch (without starting the engine), press the start button (or turn the key to the start position), and observe whether the starter drive gear pops out and rotates smoothly:No jamming or abnormal noise (e.g., gear impact sound), and the operation time does not exceed 5 seconds (to avoid starter overheating).
After releasing the button, the drive gear should retract quickly without jamming.
Start the engine: Press the start button, the starter should drive the engine to run smoothly, and the starter stops working immediately after the engine starts successfully.
Do not start continuously more than 3 times, with an interval of 1 minute each time (to prevent starter overload and ablation). If starting is difficult, check:
Whether the meshing between the drive gear and flywheel ring gear is normal;
Whether the battery voltage is ≥22V (not lower than 18V during startup);
Whether the line contact is poor (terminal heating or sparking).
After starting, run at idle speed, check that there is no oil leakage from the starter housing (whether the flywheel housing oil seal is intact) and no abnormal noise (e.g., gear meshing sound, electromagnetic switch hum).
Touch the wiring terminals, no obvious heating (normal temperature ≤60℃), otherwise re-tighten the terminals or check if the line cross-sectional area matches (9KW starter needs to be equipped with ≥16mm² cable).
Avoid hitting the starter housing with tools during installation (to prevent damage to internal coils and bearings).
If the starter is equipped with a one-way clutch, confirm that the rotation direction of the clutch is consistent with that of the engine flywheel (clockwise or counterclockwise, refer to the excavator manual).
After removing the old starter, it is recommended to check the wear of the flywheel ring gear (replace if there is tooth surface peeling, missing teeth, otherwise the new starter gear is easy to be damaged).
If the starter idles (drive gear does not mesh with the flywheel) after installation, check the electromagnetic switch stroke or one-way clutch status.
Strictly follow the excavator manufacturer's maintenance manual. The installation details of starters of different brands (e.g., Caterpillar, Komatsu, Sany) may be slightly different, subject to the model-specific documentation.
References：
The installation method and precautions for the 24V 9KW starter motor of an excavator that you previously reviewed do not originate from a single specific authoritative document or official manual of a particular brand. Instead, they are compiled and summarized based on universal industry standards for excavator starter installation, mechanical maintenance knowledge from multiple platforms, and disassembly/assembly standards for similar starter motors. The specific reference basis is as follows:
Materials such as the standard courseware for starter disassembly, assembly and maintenance on Original Power Documentation, and the starter installation guide released by Pacific Auto Encyclopedia clearly define core processes—such as disconnecting the negative battery terminal before starter disassembly/assembly, fixing bolts to the specified torque, and conducting no-load and load tests after installation. These serve as the basic framework for compiling the content.
Electromechanical Home mentions that 24V 9KW starters are suitable for heavy-duty equipment such as mining trucks and excavators; installation data for modern excavator starters on Auto Master specifies model verification, cleaning of the installation area near the engine, and other model-specific key points for excavator starter installation, providing support for aligning the content with excavator scenarios.
The heavy-duty component starter installation guide from Fab Heavy Parts and the starter disassembly/assembly precautions on Autohome supplement details such as wiring connection sequence, avoiding impact on components, and one-way clutch inspection. These align with the high-power, high-voltage operating characteristics of starters for heavy equipment like excavators, making the summarized content more targeted.
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