ID HQ SERIES ARMATURE [9553NB] 4" ANGLE GRINDER SPARE PART [Makita Type] - 29004
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Restore Full Power — Engineered for Precision, Built for Longevity
ID HQ Series Armature is a precision-engineered 4" angle grinder spare part designed as a direct Makita-type replacement for 9553NB 4" angle grinders. Built with a high-grade magnetic core, copper winding, and commutator assembly, this armature efficiently converts electrical energy into mechanical rotation, restoring your grinder to full operational performance. Ideal for professional repair technicians and workshop maintenance teams demanding OEM-grade reliability at an accessible price point.
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- Makita 9553NB Compatible Design: This armature is engineered as a direct drop-in replacement for the Makita 9553NB 4" angle grinder, ensuring a precise mechanical and electrical fit without modification. The dimensional tolerances match OEM specifications, allowing for a straightforward swap during servicing.
- Electromagnetic Core Construction: The armature features a laminated magnetic core that minimises eddy current losses, improving energy transfer efficiency. This design reduces heat build-up during extended operation — a critical factor in professional-grade tool longevity.
- Precision Copper Winding: The copper coil winding is wound to exact specifications, ensuring consistent resistance values and optimal torque output. Properly wound armatures directly impact the RPM stability and cutting/grinding performance of the tool.
- Commutator Integrity: The commutator is machined to tight tolerances to maintain reliable brush contact, reducing arcing and extending the service life of both the armature and the carbon brushes. This is essential for maintaining consistent power delivery under load.
- CE Certified (Machine Test): This armature carries CE certification, confirming it has been tested to meet European machinery safety directives. This makes it suitable for use in professional environments where compliance and traceability are required.
- Cost-Effective Repair Solution: At a competitive price point (AED 18.00), this ID HQ Series spare part (SKU: 29004) offers a significantly more economical path to tool restoration compared to purchasing a new grinder — reducing downtime and total cost of ownership for workshops and contractors.
This armature is supplied as 1 piece (Armature, 1 Pcs) and carries CE (Machine Test) certification, confirming compliance with applicable European machinery safety standards for use in professional and industrial repair applications.
General Purchase & Comparison Queries
Is this armature compatible with my Makita 9553NB angle grinder?
Yes. This ID HQ Series Armature (SKU: 29004) is specifically engineered as a Makita-type replacement for the 9553NB 4" angle grinder. It is designed to match the original OEM dimensions and electrical specifications, making it a direct drop-in replacement without requiring any modifications to the tool housing or brush assembly.
How does the ID HQ Series armature compare to an original Makita armature?
The ID HQ Series armature is manufactured to match the core specifications of the original Makita armature — including winding resistance, commutator diameter, and shaft dimensions. It carries CE (Machine Test) certification, confirming it meets applicable safety standards. For most repair and maintenance applications, it offers a reliable and significantly more cost-effective alternative to sourcing a genuine OEM part.
What is included in the package?
The package includes one (1) armature for the Makita-type 9553NB 4" angle grinder. Carbon brushes, bearings, and other consumables are not included and should be inspected and replaced separately as part of a complete service.
Product-Specific and Usage Queries
What does an armature do in an angle grinder?
The armature is the rotating component inside the motor of an angle grinder. It consists of a laminated magnetic core, copper winding, and commutator. When electrical current passes through the windings in the presence of the stator's magnetic field, it generates rotational force (torque), which drives the grinder's spindle and disc. A damaged or burnt armature will cause the tool to lose power, run erratically, or stop functioning entirely.
Is this armature suitable for heavy-duty or continuous use after installation?
Yes. The ID HQ Series armature is built with a high-grade laminated magnetic core and precision copper winding designed to minimise heat generation and energy loss during operation. Once correctly installed with properly seated carbon brushes and clean bearing surfaces, it is suitable for regular professional use in grinding, cutting, and surface preparation tasks.
Do I need any special tools to install this armature?
Installation requires standard power tool servicing tools, including a bearing puller (to remove the front bearing from the old armature shaft), a bearing press or arbor press (to seat the bearing onto the new armature), and basic screwdrivers and spanners to disassemble and reassemble the grinder housing. It is recommended that installation be carried out by a qualified power tool technician to ensure correct assembly and safe operation.
Problem/Solution-Oriented Queries
My angle grinder has stopped working or lost power — could the armature be the cause?
A faulty armature is one of the most common causes of power loss or complete failure in angle grinders. Signs of a burnt or damaged armature include: the tool not starting, excessive sparking from the brush area, a burning smell, or the motor running but the disc not spinning at full speed. You can test the armature using a multimeter or armature tester (growler) to check for open circuits, short circuits, or grounded windings. If a fault is confirmed, replacing the armature with this ID HQ Series unit (SKU: 29004) will restore the tool to working condition.
The grinder vibrates excessively after I replaced the armature — what could be wrong?
Excessive vibration after an armature replacement is typically caused by one of the following: worn or incorrectly seated bearings on the armature shaft, an improperly balanced disc, or the armature not being fully seated in the housing. Ensure the front and rear bearings are in good condition and fully pressed onto the shaft. Also verify that the commutator end cap and brush holders are correctly aligned and secured before operating the tool.
Armature (1 Pcs)