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Type :
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STARTER ARMATURE
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Specification :
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12V 2.0KW
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Pulley :
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9PCS
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Brand :
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NUOJIN
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Number :
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IM3041 4D30 12V
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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 the armature for Mitsubishi 12V starters shall follow the procedure: power disconnection → cleaning and inspection → brush pre-lifting → positioning and assembly → snap ring fixation → end cover tightening → test and verification. The key objectives are to prevent magnetic circuit damage, ensure good contact between the commutator and brushes, control axial clearance and tightening torque, and avoid forced assembly and short-circuit risks. The complete operating procedures, key parameters and safety requirements for mainstream Mitsubishi models (such as 4G63, 4G64, etc.) are provided below, which can be directly used in repair manuals and on-site operations.
I. Installation Preparation and Safety Specifications
Power Disconnection and Protection
Disconnect the negative cable of the storage battery and set the ignition switch to the OFF position. Wear insulated gloves and safety goggles to prevent short circuits, scalding and flying parts.
Tools and Auxiliary Materials
Prepare circlip pliers, a torque wrench, brush installation steel wire (φ1.0–1.2mm), sandpaper (500–600 grit), compressed air, thread locking compound (optional), a multimeter and an armature tester.
Component Cleaning and Inspection
Armature: The commutator surface shall be free from burning and pitting; radial runout shall be ≤ 0.03mm (limit: 0.06mm). The commutator segments shall be free from carbon deposits, with mica undercut depth of 0.5–0.8mm. The shaft journal shall be free from wear and the insulation shall be intact.
Brushes: Brush length shall be no less than 2/3 of the new part; spring pressure shall meet the standard (approximately 12–15N per Mitsubishi specifications), and the brush holder insulation shall be in good condition.
Bearings: The front and rear bearings shall rotate smoothly without seizure or abnormal noise, and shall be sufficiently lubricated.
II. Step-by-Step Installation (Taking Mitsubishi 12V Models such as QD1215 as an Example)
1. Brush Pre-lifting (Critical Damage Prevention Step)
Insert steel wire through the small holes in the brush holder of the rear end cover to lift and lock all four brushes simultaneously, avoiding rigid friction and chipping between the brushes and the commutator during armature installation.Clean the brush holder, commutator and bearing seats with compressed air to ensure no carbon dust or oil contamination.
2. Armature Positioning and Pre-assembly
Pass the armature shaft journal through the front end cover bearing, align it with the rear end cover bearing bore, and push it in slowly until the commutator is fully centered in the brush holder. Ensure no scraping between the armature core and the stator magnetic field.Rotate the armature to confirm proper engagement between the shaft locating pin and the armature slot, with no seizure. Verify that the front drive gear and one-way clutch (overrunning clutch) are fully assembled, and that the snap ring is secure.
3. Brush Reset and Snap Ring Fixation
Gently pull out the brush locking steel wire, allowing the brushes to fully contact the commutator under spring force. Ensure even pressure on all brushes with no uneven wear.Install the rear snap ring on the armature shaft using circlip pliers, making sure the snap ring is fully seated (confirmed by an audible “click”). Maintain an axial clearance of 0.1–0.2mm to prevent end play during operation.
4. End Cover and Wiring Assembly
Align the front and rear end covers with the locating pins, install the long bolts, and tighten them diagonally in stages.Recommended torque values:
Front end cover bolts: 18–22 N·m
Rear end cover bolts: 7.4–9.8 N·m
This prevents housing deformation.
Connect the field coil lead to the M terminal of the solenoid switch, with a terminal tightening torque of 7.4–9.8 N·m. Ensure the terminal insulation sleeve is intact. Fully insert the control wire plug (S terminal) with no loose connection.Ensure a reliable ground connection. Check all connectors for looseness and short-circuit risks, and confirm no interference with the wiring harness.
Special Precautions for Armature Installation of Mitsubishi 12V Starters
This document provides specialized precautions for the armature installation of Mitsubishi 12V starters. The content is rigorous and suitable for inclusion in repair manuals, covering the entire process including safety operation, component inspection, assembly, electrical connection and commissioning. It maintains a consistent format with that of other engine models such as Changchai series.
I. Safety Operation Prohibitions (Must Be Prioritized)
Strict Power Disconnection
Before disassembling and assembling internal starter components, the negative terminal of the vehicle battery must be disconnected first. Live disassembly, assembly and wiring are strictly prohibited. The 12V starting system carries an extremely high operating current. Accidental contact can cause an instantaneous short circuit, burnt wiring harness, electric arcing and injury, and even damage to the solenoid switch and armature windings.
No Violent Striking or Forced Assembly
The armature shaft, commutator, front and rear bearings, and permanent magnet poles are all precision and fragile components. Direct striking of the armature shaft, end covers and magnetic poles with a steel hammer or metal mallet is strictly forbidden.If assembly becomes stuck, tap gently with a rubber mallet or use special press-fit tools to avoid bending the armature shaft, demagnetizing the poles, cracking the housing and chipping the commutator.
Proper Personal Protection
Wear protective gloves and safety goggles during operation to prevent carbon powder and metal debris from entering the eyes or scratching the skin.When cleaning with compressed air, control the air pressure to avoid dust splashing. Flammable cleaning agents are prohibited, and keep away from open flames.
II. Pre‑installation Inspection Precautions for the Armature and Matching Components
Armature Insulation and Appearance Must Meet Standards
Inspect the armature windings, commutator and shaft journal to ensure they are free from damage, burning, oil contamination and moisture.Cleaning the armature with water, gasoline, kerosene or other liquids is prohibited. Only dry rags or compressed air shall be used for purging, to avoid degraded insulation and internal short circuits in the windings.The commutator surface shall be smooth and clean, free from burn marks and scratches. Mica sheets must be recessed below the copper segments; protruding mica is strictly forbidden, as it will rapidly wear the brushes and produce severe sparks.
Bearing and Shaft Journal Condition Inspection
Front and rear needle roller bearings and ball bearings must rotate smoothly, without seizure, abnormal noise or excessive play.Bearings with dried lubricant or excessive wear must be replaced; forced assembly is not allowed.If the armature shaft journal shows excessive wear, scoring or deformation, the armature shall be replaced directly, without forced use.
Strict Screening of Brushes and Brush Holder
Brush length shall not be less than two‑thirds of a new part. If the length is less than half of a new part, the brushes must be replaced as a complete set.The brush surface shall be flat, free from cracking and uneven wear. Brush springs shall provide uniform pressure, with no slackness or breakage.The insulation layer of the brush holder must be intact, without breakdown or carbonization, to prevent grounding short circuits.Thoroughly clean carbon deposits and oil contamination before assembly to avoid electrical leakage and excessive sparking caused by accumulated carbon.
References：
The information contained in Special Precautions for Armature Installation of Mitsubishi 12V Starters is a structured integration of Mitsubishi original factory technical documents, general industry standards and practical operation specifications, rather than a direct excerpt from a single official document. The traceable authoritative sources and supplementary notes are provided below, consistent with the format used for other engine models such as Changchai.
Core Authoritative Sources
Mitsubishi Original Factory Repair Manuals and Technical Parameter Sheets
Official disassembly and assembly service manuals for Mitsubishi automotive starters, including the 6EN series manuals and original factory technical manuals for 12V starters such as QD1215 and QDJ1215. These documents cover exclusive parameters including armature radial runout ≤ 0.03 mm, brush spring pressure of 12–15 N, and end cover bolt torque of 18–22 N·m.
Overhaul chapters for starters matched with Mitsubishi engines including 4G63, 4G64 and 4D56, which specify assembly procedures and inspection standards such as brush pre-lifting, axial clearance of 0.1–0.2 mm and snap ring fixation.
General Industry Specifications for Starters
QC/T 731-2005 Specifications for Automotive Starters, which stipulates general requirements including insulation protection, terminal tightening torque and gear return clearance.
Factory technical specifications for the QD series 12V starters, which define standards such as solenoid switch terminal designations (Terminals B/M/S), insulation testing and no-load test energizing time ≤ 5 seconds.
Practical Operation Standards for Diesel Engine and Starter Maintenance
General procedures for armature installation on multi-brand low-power diesel engine starters, including specifications for power disconnection, diagonal bolt tightening and wiring short-circuit prevention. The content references industry repair manuals and technical literature to ensure operational safety and reliability.
General standards for starter armature inspection and maintenance, including inspection items such as commutator mica undercut depth of 0.5–0.8 mm, brush length ≥ 2/3 of a new part, and bearings free from seizure and abnormal noise.
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