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Type :
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STARTER ARMATURE
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Specification :
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24V 5.5KW
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Pulley :
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13T
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Brand :
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NUOJIN
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Number :
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IM3141 2801
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Quality :
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NEW
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Delivery time :
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10DAY
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The installation of Scania 24V 5.5KW starter armature shall be carried out in the sequence of cleaning → lubrication → positioning → press-fitting → clearance adjustment → fastening → testing to ensure compliance with insulation, lubrication and clearance requirements, and avoid rework and faults.
Disconnect the negative terminal of the battery to prevent short circuit.
Wipe the armature, windings and solenoid switch with gasoline-dampened (wrung-out) cotton yarn or blow clean with compressed air;
Other components can be cleaned with a dedicated cleaning agent.
The armature shaft shall be free of bending, the commutator shall have no ablation, the windings shall be intact, and the bearings/bushings shall not be jammed;
The one-way clutch shall slide smoothly along the shaft.
Socket wrench, snap ring pliers, torque wrench, lubricating grease, feeler gauge, sealant (if applicable).
Armature axial end clearance: 0.10–0.25 mm;
Pinion-thrust washer clearance: 1.5–2.5 mm at initial contact, 0.5–1.5 mm at full stroke.
Insulation resistance between the commutator and shaft, and between windings and housing shall be ≥1 MΩ (tested with a 500 V megohmmeter).
Use high-temperature lithium-based grease and prevent grease from entering the contact surface between the brush and commutator.
Connect the power supply; the starter shall run smoothly without abnormal noise, sparking or overheating.
After installation, the engine shall start smoothly, with normal engagement/disengagement and no gear knocking or jamming.
Confirm there is no grounding or short circuit.
Before installation, the negative cable of the battery must be disconnected, and wait for more than 5 minutes to allow the internal capacitor of the starter to fully discharge, so as to prevent short-circuit sparking or electric shock.Do not touch conductive components such as the armature winding and brushes when the power is on to avoid arc burns.
Tools with insulated handles must be used to prevent the tools from short-circuiting the armature and the housing; the operation site should be kept dry and free of flammable and explosive oil stains.It is strictly forbidden to directly strike the armature shaft or commutator with a metal hammer to prevent shaft bending and commutator segment deformation.
When carrying the armature, lift the journal or iron core; do not grasp the winding to prevent damage to the enameled wire and short circuit.The contact surface between the brush and the commutator must be kept clean. Wipe with a dust-free cloth dipped in anhydrous ethanol before installation, and no oil stains or dust shall remain.
High-temperature lithium-based grease can only be applied to the armature journal, bearing bush, and shift fork pin shaft, and the dosage should be based on covering the contact surface without overflowing.It is strictly forbidden for lubricating grease to contact the commutator, brushes, and winding surfaces, otherwise, it will cause excessive brush sparking and reduced insulation performance.
When the armature is put into the housing, it must be aligned with the concentric position of the stator magnetic pole and the armature iron core. If jamming occurs, it cannot be forced into place; check whether the bearing bush is eccentrically worn or the shaft is bent.The end cover bolts should be pre-tightened in batches in a diagonal cross sequence, and the final torque must strictly follow the technical manual (usually 12-15 N·m) to prevent housing deformation and armature jamming.
The axial end clearance of the armature must be controlled within 0.10-0.25 mm. If the clearance is too large or too small, it must be adjusted by increasing or decreasing the adjusting washer at the end cover, and installation is prohibited without calibration.The meshing clearance between the pinion and the thrust washer: the initial contact position is 1.5-2.5 mm, and the full-stroke position is 0.5-1.5 mm. Abnormal clearance will cause meshing tooth hitting or failure to disengage.
After installation, a 500V megohmmeter must be used to test the insulation resistance between the armature winding and the shaft/housing. A value ≥1 MΩ is qualified. If the insulation is poor, check for winding damage or moisture.
Connect a temporary power supply for no-load operation (single operation duration ≤ 5 seconds), which must meet the following requirements: stable operation, no strong sparks on the commutator, and no obvious swing of the armature; otherwise, disassembly and re-inspection are required.
Observe the meshing state during the first start-up after installation. If tooth hitting or weak starting occurs, stop the machine immediately to check the clearance or one-way clutch; repeated forced starting is prohibited.
References：
The "Precautions for Installing the Armature of Scania 24V 5.5KW Starter" mentioned is not an original excerpt from the official manuals of Scania or Bosch. Instead, it is an industry-general operation guide compiled based on universal starter maintenance specifications and relevant technical parameters of Scania/Bosch.
Torque and Clearance Parameters: The starter assembly bolt torque of 37 N·m, terminal nut torque of 9.8 N·m, axial end clearance of 0.10–0.25 mm, and pinion clearance of 1.5–2.5 mm (initial contact)/0.5–1.5 mm (full stroke) are all derived from the official technical documents of Scania and Bosch.
Safety Operation Specifications: Requirements such as power-off operation, use of insulated tools, and prohibition of striking comply with the universal safety standards for automobile electrical maintenance.
Assembly Process: Restrictions on lubrication parts, brush installation methods, and insulation testing requirements refer to the universal processes of the starter maintenance industry.
Scania Official Channels: Contact authorized Scania dealers or after-sales service centers to purchase maintenance manuals for corresponding vehicle models (e.g., Scania Engine Electrical and Troubleshooting).
Bosch Official Data: Visit the Bosch Automotive After-sales website to query technical specifications for specific starter models (e.g., 0001241001).
Professional Maintenance Platforms: Retrieve the starter disassembly and assembly chapter of Scania vehicle models through automobile maintenance databases (e.g., EPC, maintenance information systems).
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