Product Overview
The N031214 Brush Box Set is a precision-engineered carbon brush holder assembly designed for 18V cordless hammer drills built on this common platform. This complete brush box set (referenced as “BRUSHBOX SA” in OEM parts diagrams, item #44)[reference:6][reference:7] contains two carbon brush holder assemblies with pre-installed brushes – eliminating the need for separate brush and holder purchases.
Designed for professional repair technicians and equipment maintenance specialists, this brush box set restores factory-spec electrical contact to tools suffering from worn brushes or damaged brush holders – common failure points that manifest as intermittent operation, loss of power under load, excessive sparking, or complete motor failure. The carbon brushes are held securely in the holders to effectively and efficiently transfer electricity into the motor, maintaining stable current delivery to the commutator.[reference:8]
Critical Note on Part Number Interchangeability: N031214 is the primary OEM part number for this brush box set. It is also referenced as N031214SV in some regions[reference:9] and cross-referenced as 41JC46 in supplier catalogs[reference:10]. This listing supplies the current-spec N031214 assembly, which is the direct replacement for all variants.
💡 Pro Tip – Pre-Installation Diagnostic: Before replacing the brush box set, perform a visual inspection. Remove the housing from your drill and locate the brush holders near the motor[reference:11]. Extract the carbon brushes – if they’re worn below 5mm, show signs of pitting, glazing, or uneven wear, replacement is required. Also inspect the commutator surface – if it’s heavily grooved or scored, consider having it turned or replaced. Always remove the battery pack before beginning any disassembly or inspection procedure.
Diagnostic & Fitment – When to Replace
Specification Comparison
| Specification | Worn / Generic Aftermarket | FixPartHub Precision Replacement ✅ |
|---|---|---|
| Brush Material | Substandard carbon – high resistance, rapid wear | OEM-spec carbon – consistent conductivity |
| Holder Material | Low-grade plastic – prone to cracking | OEM-spec holder – secure brush retention |
| Spring Tension | Inconsistent – arcing and sparking | OEM-spec spring – consistent contact pressure |
| Set Completeness | Brushes only – holder purchased separately | Complete brush box set – two holders + brushes |
| Part Number Status | Discontinued or generic cross-reference | Active OEM N031214 – direct replacement |
Teardown & Replacement Workflow
Compatibility – Cross-Reference & OEM Part Numbers
Diagnostic Q&A
❓ Q: My drill runs intermittently – is this definitely a brush holder problem?
A: Not always. First, clean the battery and tool contacts with an eraser. If the problem persists, inspect the brushes – remove the housing and extract the brush holders[reference:16]. If the brushes are worn below 5mm, pitted, or glazed, the brush box set needs replacement. The N031214 is a complete brush box set containing both brush holders and pre-installed brushes[reference:17] – replacing the entire assembly addresses both brush wear and holder damage simultaneously.
❓ Q: What’s the difference between N031214 and just buying carbon brushes separately?
A: N031214 is a complete brush box set (BRUSHBOX SA)[reference:18] containing two brush holder assemblies with pre-installed carbon brushes[reference:19]. If your brush holders are damaged, warped, or have failing spring tension, replacing only the brushes won’t solve the problem. This complete assembly ensures both the brushes and their holders are restored to OEM specification.
❓ Q: What models are compatible with the N031214 brush box set?
A: This brush box set is compatible with DCD985, DCD985B, DCD985L2, DCD985M2, DCD980, DCD940, DCD970, DCD930, DCD950, DCD910KX, DCD920KX, DCD990, and related 18V hammer drill variants[reference:20][reference:21][reference:22]. Always verify your tool’s model number against the compatibility list before ordering.
❓ Q: How do I test if the carbon brushes are worn without disassembling the tool?
A: While you can’t inspect the brushes without opening the housing, there are diagnostic signs: intermittent operation, loss of power under load, excessive sparking through the motor vents, or a burning smell during operation. These symptoms indicate worn brushes or brush holders. Disassembly is required for visual confirmation – if the brush length is less than 5mm or the contact face is pitted, replacement is necessary.
Safety Notes
- 🔴 Always remove the battery pack before beginning any disassembly or brush holder replacement procedure.
- ⚡ Allow the tool to cool completely before handling internal components – motors can reach high temperatures during operation.
- 🔧 Use correct torque values – housing screws typically require 0.8–1.2 Nm (7–10 in-lbs). Over-torquing can strip housing threads or crack the plastic housing.
- 🧤 Wear ESD-safe gloves when handling the brush holder assembly to prevent static discharge damage to sensitive electronic components.
- 📐 Note brush holder orientation before removal – the new N031214 assembly must be installed in the correct orientation for proper commutator contact.
- ✅ Perform a no-load test before full reassembly – insert battery and verify smooth operation with minimal sparking before reinstalling the outer housing.
A: The N031214 is a complete brush box set (BRUSHBOX SA) containing two carbon brush holder assemblies with pre-installed carbon brushes. It is a direct-fit OEM replacement for 18V hammer drills, restoring full electrical contact and motor performance.
A: Yes. N031214SV is an alternate reference for the same part. This listing supplies the current-spec N031214 assembly, which is the direct replacement for both part number variants.
A: This brush box set is compatible with DCD985, DCD985B, DCD985L2, DCD985M2, DCD980, DCD940, DCD970, DCD930, DCD950, DCD910KX, DCD920KX, DCD990, and related 18V hammer drill variants
A: Common symptoms include intermittent operation, loss of power under load, excessive sparking through the motor vents, or a burning smell during operation. Visual inspection of the brushes – if worn below 5mm or pitted – confirms replacement is needed.
