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Type :
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Starter
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Specification :
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24V，7.0KW
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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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300516-00075B
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Quality :
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renovate
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Delivery time :
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30day
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I. Preparation Work
Turn off the ignition switch, remove the key, disconnect the negative (-) battery terminal (ground connection) first, followed by the positive (+) terminal to prevent short circuits and electric shocks.
Lay down fender covers to avoid scratching the vehicle's paintwork; clear the work area and prepare tools and accessories.
Clean the mounting surface, locating spigot and bolt holes of the engine flywheel housing to remove oil stains, rust and old sealant; lightly sand the contact surface until metallic luster appears.
Inspect the flywheel ring gear: ensure there is no tooth chipping, cracking or excessive wear; replace it if damaged to avoid starter gear failure.
Inspect the new starter: confirm intact appearance, smooth rotation of the drive gear and overrunning clutch, and flexible movement of the shift fork; apply lithium-based grease to the contact area between the gear and the shift fork.
Align the starter with the flywheel housing spigot, push it in slowly and ensure full contact between the mounting surfaces with no gaps.
Insert the mounting bolts, hand-tighten them initially, then use a torque wrench to tighten them to 78–82 N·m (approx. 8.0 kg·m) in a crisscross diagonal sequence.
Do not strike the starter to prevent damage to internal components.
Connect the thick cable to the B+ terminal of the solenoid switch, tightening to a torque of 12–14 N·m; connect the thin cable to the S terminal and ensure the connector is fully engaged and locked.
Check the wiring harness routing to avoid interference with rotating components; secure the harness with cable ties and leave adequate slack.
Reconnect the battery terminals in the order of positive (+) first, then negative (-) and ensure firm connections.
Turn off all electrical accessories, turn the key to the "START" position and test the starter: it should start smoothly without abnormal noise, and the engine should start normally; limit each starting attempt to a maximum of 5 seconds; if starting fails, wait 10–15 seconds before retrying.
Post-start inspection: check for no leaks or abnormal noise, and ensure no overheating of the wiring harness.
Power-off First: Always disconnect the negative battery terminal before installation to prevent short circuits.
No Striking: The starter is a precision component; striking may damage the rotor and gears.
Ring Gear Inspection: A damaged flywheel ring gear will accelerate starter gear wear and must be replaced.
Harness Protection: Avoid contact between the wiring harness and high-temperature or rotating components to prevent abrasion and short circuits.
Standard Operation: Do not operate the starter continuously for more than 5 seconds to prevent coil burnout due to overheating.
Conduct regular inspections of the starter mounting bolt torque and circuit connections to prevent loosening.
Keep the starter clean and dry to avoid oil or water ingress into the interior.
Inspect the wear condition of the drive gear and overrunning clutch every 500 operating hours or 6 months and replace them promptly if worn.
Turn off the ignition switch and remove the key first. Disconnect the negative battery cable first, then the positive cable to prevent short circuits in the wiring harness during installation, which may cause sparks, burnout of the starter coil or vehicle electrical components. After power-off, wait 1–2 minutes to discharge residual electricity in the circuit.
Confirm that the model of the new starter is 24V 7.0kW, and that its flywheel ring gear tooth count and mounting spigot dimensions match those of Doosan models (e.g., DH220-5, DL06 engine), to avoid abnormal gear meshing caused by mismatched installation.
Inspect the appearance of the starter: no cracks on the housing, no chipping/rust on the drive gear, and flexible movement of the shift fork. Rotate the overrunning clutch; it should rotate smoothly in one direction and lock reliably in the reverse direction.
Clean the installation area in the engine compartment to ensure no oil stains, accumulated water or debris. Lay down protective pads to prevent tools and bolts from falling into the engine compartment.
Prohibit operation in flammable and explosive environments (e.g., gasoline refueling areas, oil accumulation zones) to avoid hazards caused by electric sparks.
Clean the mounting surface, spigot and bolt holes of the flywheel housing with a brush and cleaning agent to remove old sealant, rust and oil stains. Lightly sand the contact surface until metallic luster appears, ensuring full contact between the starter and the flywheel housing mounting surface with no gaps.
If the mounting surface is deformed due to collision, repair it first. Otherwise, it will lead to uneven stress on the starter, bolt breakage or gear abnormal noise.
When aligning the starter with the spigot, push it in slowly. Do not strike the housing or gear end with a hammer, to prevent damage to the internal rotor, solenoid switch and overrunning clutch.
If the starter cannot be seated smoothly, check for foreign objects or dimensional deviations on the spigot, and install it only after troubleshooting.
Perform circuit connection after the mechanical fixation of the starter is completed:
First connect the thick power cable to the B+ terminal of the solenoid switch, with the torque controlled at 12–14 N·m. Ensure the terminal gasket is in place to prevent overheating due to poor contact.
Then connect the thin control cable to the S terminal, and ensure the connector is fully locked with no looseness.
Do not reverse the positive and negative cables, otherwise it will directly burn out the starter solenoid switch and vehicle electronic control unit (ECU).
Arrange the wiring harness routing to avoid contact with rotating components such as the engine flywheel and pulley, and keep it away from high-temperature components such as the exhaust pipe (with a spacing of ≥ 5 cm).
Secure the wiring harness with high-temperature resistant cable ties, leaving appropriate movement allowance to prevent harness breakage caused by pulling during vehicle vibration.
After installation, check if the negative battery ground connection is secure. The ground contact surface must be clean and free of rust; otherwise, it will cause weak starting of the starter.
Engine Volume
Covers the service manuals for engine models such as DL06, D1146 and DB58. These manuals clearly specify the starter installation procedure, spigot positioning, crisscross diagonal bolt tightening method, and the required torque (approx. 78–82 N·m, equivalent to 8.0±1.0 kg·m).
Excavator Volume
Includes the shop manuals for excavator models such as DH220-5 and DH225LC. These manuals standardize the power-off sequence, circuit connection steps and testing requirements.
Torque Reference Basis
As specified in the Starting Motor Installation chapter of the DL06 engine service manual, the torque for the starter mounting bolts is 8.0±1.0 kg·m (approx. 78–82 N·m).
This manual emphasizes critical safety and operational specifications, including:
Mandatory power-off protocol (disconnect the negative battery terminal first, followed by the positive terminal)
Prohibition of striking the starter unit
Wiring harness protection requirements
Starter operation guidelines (maximum 5 seconds per single start attempt, with an interval of 10–15 seconds between retries)
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