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Type :
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Engine starter
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Specification :
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24V 6.0KW
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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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65.26201-7088 300516-00057A
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Quality :
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Remanufacture
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Delivery time :
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10DAY
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Installation of Daewoo 24V 6.0KW Starter Motor (commonly adapted to Daewoo/Doosan construction machinery, such as DH220-3 excavators, some forklifts, etc.) must strictly follow the principles of power-off safety, precise positioning, standardized torque and circuit connection. Below is the complete installation process and key points.
Necessary tools: Socket wrench (14-19mm common), torque wrench, Phillips/flathead screwdriver, brush, sandpaper, copper or plastic scraper, insulating tape.
Safety measures: Disconnect the negative cable of the vehicle's 24V battery to prevent short circuit; turn off the ignition switch and remove the key.
Verify the starter motor model (e.g., QDJ2503, part numbers 1197763, 300516-00015, etc.), number of teeth (11T/13T), power 6.0KW, voltage 24V to ensure matching with the engine flywheel ring gear.
Check that the starter motor has no cracks on the appearance, the solenoid switch operates smoothly, the overrunning clutch has no jamming, and the brushes are in good contact with the commutator.
Mark the positions of the power cable and control cable of the old starter motor; remove the fixing bolts (usually 2-3 pieces) and take off the old starter motor.
Clean oil stains, rust and residual old gaskets on the engine mounting surface (flywheel housing) to ensure flat fitting.
Align the new starter motor with the mounting holes of the flywheel housing to ensure the drive gear is parallel to the meshing surface of the flywheel ring gear without offset.
Install a new lock washer, insert the fixing bolts, pre-tighten diagonally and crosswise (to avoid housing deformation), then tighten to the specified torque with a torque wrench (common torque for Daewoo construction machinery: M12 bolts about 45-55N·m, M14 bolts about 65-75N·m, subject to the model manual).
First connect the control cable (small terminal): Insert the plug and fasten it, or tighten the terminal nut (torque about 5-8N·m) to ensure no looseness.
Then connect the main power cable (large terminal): Put on the copper lug, tighten the nut with a torque wrench (about 18-22N·m), apply conductive paste if necessary, and finally wrap the exposed part with insulating tape.
No-load test: Turn on the power, press the start switch briefly, observe that the starter motor runs smoothly without abnormal noise, and the drive gear pops out and retracts quickly.
Load test: Start the engine, confirm that the starter motor can drive the flywheel to run normally without slipping or abnormal noise; start continuously for 2-3 times and check that the starter motor and circuits have no overheating.
Clearance inspection: If the starter motor is equipped with adjusting gaskets, ensure the end clearance between the drive gear and the flywheel ring gear is 1-4mm; replace the gaskets to adjust if the clearance is improper.
Below are the core precautions for the installation of Daewoo 24V 6.0KW Starter Motor, sorted by operation links to ensure installation safety and equipment reliability:
The negative cable of the battery must be disconnected first, the ignition switch turned off and the key removed to prevent short circuits in the wiring during installation that could cause sparks, burn out the solenoid switch or damage the battery.
Check the starter motor model (e.g., QDJ2503), number of teeth (11T/13T), power 6.0KW, voltage 24V to confirm consistency with the modulus and number of teeth of the engine flywheel ring gear; verify that the part number (e.g., 1197763, 300516-00015) is suitable for the target model (e.g., DH220-3 excavator) to avoid abnormal meshing caused by incorrect installation.
Clean oil stains, rust and residual old gaskets on the mounting surface of the engine flywheel housing; otherwise, the starter motor may be installed askew, resulting in uneven gear meshing clearance.Inspect the new starter motor: the solenoid switch operates smoothly, the overrunning clutch has no jamming, the contact area between the brushes and the commutator is ≥75%, and the housing has no cracks; damaged components must be replaced in advance.
Install the fixing bolts by diagonal cross pre-tightening to avoid housing deformation due to stress; it is strictly forbidden to tighten with an air gun, and a torque wrench must be used to operate according to the specified values (M12 bolts: 45-55N·m, M14 bolts: 65-75N·m) to prevent thread slipping or housing cracking.Install lock washers (spring washers/flat washers); missing washers will cause bolt loosening, leading to abnormal noise or falling off of the starter motor during operation.
Wiring sequence: first connect the control wire (small terminal, torque 5-8N·m), then connect the main power wire (large terminal, torque 18-22N·m); reverse the operation during disassembly to avoid short circuit between the main power supply and the engine body.The main power wire must use copper core wire with a specification ≥50mm², the terminals must be crimped firmly, conductive paste can be applied if necessary to reduce contact resistance, and the exposed parts must be wrapped with insulating tape.
It is forbidden to strike the starter motor housing, solenoid switch or drive gear with hard objects such as hammers to prevent damage to internal armature and pole windings.High-temperature grease (e.g., lithium-based grease) should be applied to the shift fork pin shaft and the helical spline of the overrunning clutch; a small amount of lubrication should be applied to the solenoid switch plunger, not excessive (to avoid oil contamination of the clutch).
The end clearance between the drive gear and the flywheel ring gear must be controlled within 1-4mm; too small clearance is prone to gear jamming, and too large clearance causes large meshing impact; replace the adjusting gaskets with appropriate thickness if the clearance is not up to standard.After refitting the guard plates and dust covers, confirm that there is no interference between the starter motor and surrounding components (e.g., exhaust pipe, oil pipe) to avoid friction damage during operation.
No-load test: single start time ≤5 seconds, interval between two starts ≥15 seconds to prevent overheating and burnout of the starter motor; observe whether the operation is stable and whether the drive gear pops out/retracts quickly.Load test: after starting the engine, check for no slipping or abnormal noise; touch the wiring and starter motor housing after 2-3 consecutive starts to ensure no abnormal high temperature (≤60℃).
Recheck the torque of the fixing bolts and the state of wiring connections after the first 50 hours of operation after installation to prevent loosening caused by vibration.Avoid frequent and long-time starting (e.g., repeated ignition when the engine fails), otherwise it will accelerate the wear of brushes and aging of armature windings.
References：
The sources of the content regarding "Precautions for Installation of Daewoo 24V 6.0KW Starter Motor" you inquired about are divided into the following two categories, with the core authoritative sources being original factory technical documents and industry universal specifications, detailed as follows:
Applicable models: Maintenance manuals for construction machinery such as DH220-3 excavators and some forklifts (corresponding models for part numbers like 1197763, 300516-00015, etc.), including core parameters such as starter motor installation torque, gear meshing clearance, and wiring specifications.
Obtaining channels: After-sales section on the official website of Doosan Construction Machinery, technical support from authorized dealers, and original factory paper maintenance manuals.
Based on: QC/T 29064-2019 Technical Conditions for Automobile Starter Motors, which specifies general requirements for starter motor installation matching, electrical connection, test methods, etc.
Reference: Chapters on safety operation and torque specifications for 24V starter motor installation in Maintenance of Construction Machinery Electrical Equipment published by China Machine Press.
Integrated the manufacturer's installation instructions for common models of Daewoo starter motors (e.g., QDJ2503), as well as general precautions for starter motor disassembly and assembly released by the automotive maintenance industry (such as Autohome, PCauto) (e.g., power-off operation, wiring sequence, clearance adjustment, etc.).
Torque parameters refer to the universal standards for bolt tightening in construction machinery (torque range for M12/M14 bolts), revised in combination with maintenance experience of Daewoo models.
Some details (such as diagonal pre-tightening to prevent deformation, lubrication of overrunning clutch, precautions for low-temperature installation) are derived from frontline maintenance practical experience and comply with industry maintenance specifications.
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