Product Overview
The CS23-355 / 310009340 6-Tooth Armature Rotor is a precision-engineered direct-fit replacement for the 2,300W cut-off saws built on the CS23-355 platform. This armature is the heart of the motor – converting electrical energy into the rotational force that drives the abrasive or TCT blade through steel, stainless steel, pipe, and structural profiles with precision and consistency.
Designed for professional repair technicians and equipment maintenance specialists, this armature restores factory-spec performance to tools exhibiting sluggish operation, loss of cutting power under load, or complete motor failure. The 4,000 RPM no-load speed and 2,300W input power deliver the cutting efficiency required for clean, accurate cuts in demanding workshop and jobsite applications.
The 6-tooth pinion configuration ensures optimal power transfer from the motor to the gearbox – a critical specification for cut-off saws that must maintain blade speed under heavy cutting loads. Built with robust copper windings and a durable commutator, this armature is engineered to withstand the rigors of continuous metal cutting operations. The precision-balanced rotor ensures smooth operation with minimal vibration – reducing wear on bearings and extending the service life of the complete tool.
This armature is referenced under OEM part numbers CS23-355 and 310009340, and is the direct replacement for the original equipment armature in compatible 14″ (355mm) cut-off saws, metal-cutting chop saws, and abrasive saw platforms.
💡 Pro Tip – Pre-Installation Diagnostic: Before replacing the armature, perform a visual inspection and continuity test. Remove the armature from the motor housing and inspect the commutator surface – if it’s heavily grooved, scored, or shows signs of arcing, the armature has failed. Use a multimeter to test for shorts between commutator segments (all segments should show similar resistance, typically 0.5-2.0 ohms) and between any segment and the shaft (infinite resistance = no short to ground). Also inspect the field coil (stator) for continuity – if the field coil is damaged, armature replacement alone won’t resolve the issue. For CS23-355 models, the armature is commonly referenced as item 26 in parts diagrams (OEM part 310009340). Always disconnect the tool from mains power before beginning any disassembly.
Diagnostic & Fitment – When to Replace
Specification Comparison
| Specification | Worn / Generic Aftermarket | FixPartHub Precision Replacement ✅ |
|---|---|---|
| No-Load Speed | Inconsistent – below 4,000 RPM | 4,000 RPM – OEM-spec |
| Input Power | Reduced – poor cutting performance | 2,300W – OEM-spec |
| Pinion Configuration | Inconsistent tooth count | 6-tooth – OEM specification |
| Winding Quality | Substandard copper – high resistance | OEM-spec copper windings – optimal conductivity |
| Voltage Rating | Vague or incorrect specification | 220-240V – OEM specification |
Teardown & Replacement Workflow
Compatibility – Cross-Reference & OEM Part Numbers
Diagnostic Q&A
❓ Q: My cut-off saw runs slowly and lacks cutting power – is this definitely an armature problem?
A: Not always. First, check the carbon brushes – if they’re worn below 5mm or show signs of glazing, replace them. Check the field coil (stator) for continuity with a multimeter. If the brushes and field coil check out, the armature is the likely culprit. Worn armature windings or a damaged commutator will cause loss of power and reduced cutting efficiency – requiring replacement of the CS23-355 / 310009340 armature.
❓ Q: What models are compatible with the CS23-355 / 310009340 armature?
A: This armature is compatible with CS23-355, CS23-355 S, and related 14″ (355mm) 2,300W cut-off saw platforms. It is referenced in OEM parts diagrams as item 26, OEM part number 310009340. Always verify your tool’s model number against the compatibility list before ordering.
❓ Q: How do I test if the armature is faulty with a multimeter?
A: Use a multimeter in resistance mode. Test between adjacent commutator segments – they should all show similar resistance (typically 0.5-2.0 ohms). A short (0 ohms) between any two segments indicates a shorted winding. An open circuit (infinite resistance) indicates a broken winding. Also test between any commutator segment and the armature shaft – there should be infinite resistance (no short to ground). If the armature fails any of these tests, replacement is required.
❓ Q: What is the weight of the CS23-355 / 310009340 armature?
A: The armature weighs approximately 1,500g (1.5 kg) – a substantial, heavy-duty rotor designed for professional-grade 2,300W cut-off saw applications.
Safety Notes
- 🔴 Always disconnect the tool from mains power before beginning any disassembly or armature replacement procedure.
- ⚡ Allow the motor to cool completely before handling internal components – motors can reach high temperatures during cutting operations.
- 🔧 Use correct torque values – housing screws and bearing retainers typically require 1.5-2.0 Nm (13-18 in-lbs). Over-torquing can strip threads or damage the housing.
- 🧤 Wear ESD-safe gloves when handling the armature to prevent static discharge damage to sensitive components.
- 📐 Verify commutator alignment before final assembly – the armature should spin freely with no binding or grinding feel.
- ✅ Perform a no-load test before reinstalling the blade and guard – verify smooth operation at full speed with minimal sparking.
A: Common symptoms include loss of cutting power under load, reduced blade speed, excessive sparking through the motor vents, a burning smell during operation, or complete failure to start. A multimeter test can confirm – check for shorts between commutator segments or shorts to ground (the armature shaft). If the armature fails any of these tests, replacement with a CS23-355 / 310009340 armature is required.
A: This armature is compatible with CS23-355, CS23-355 S, and related 14″ (355mm) 2,300W cut-off saw platforms. It is referenced in OEM parts diagrams as item 26, OEM part number 310009340.
A: CS23-355 and 310009340 are cross-referenced OEM numbers for the same armature rotor. 310009340 is the specific part number used for ordering the armature, while CS23-355 is the saw model designation. This listing supplies the armature (OEM 310009340) which is the direct replacement for both references.
