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Carbon Brushes

EMD 8209085 Carbon Brush

Part No. EMD 8209085 9334438 8307806

OEM-style replacement carbon brush for EMD D12 / D15 / D22 main generators on EMD diesel-electric locomotives. Electrographitic (DE8) wafer, 15.8 × 33.3 × 66.6 mm, with an insulated flexible shunt lead; cross-references EMD 8209085, EMD 9334438 and EMD 8307806.

Material	Electrographitic (EG)
Dimensions	- Thickness: 15.8 mm (0.62") - Width: 33.3 mm (1.31") - Length: 66.6 mm (2.62") - Wafer size: 15.8 ×
Application	Replacement carbon brush for EMD D12 / D15 / D22 main generators fitted to EMD diesel-electric locomotives. These are DC main-generator brushes carrying high continuous current in locomotive electrical systems; the 8209085 is listed as an EMD main-generat
Current Density	10–12 A/cm²
Speed	Maximum peripheral speed ≤ 50 m/s
Grade	Electrographite (EG)

Compatible Models

EMD 8209085 (OEM part number) EMD 9334438 (cross-reference) EMD 8307806 (cross-reference) DE8 grade (supplier designation BroadCarbon) EMD D12 / D15 / D22 main generator applications

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Technical Specifications

Specification	Value
OEM Part Number	EMD 8209085
Cross References	EMD 9334438 · EMD 8307806
Product Type	Main-generator carbon brush (locomotive)
Material	Electrographitic (EG)
Grade	DE8 (supplier designation)
Thickness	15.8 mm / 0.62"
Width	33.3 mm / 1.31"
Length	66.6 mm / 2.62"
Wafer Size	15.8 × 33.3 × 66.6 mm
Lead Type	Flexible tinned copper braid, insulated, with terminal
Voltage	Not rated (N/A)
Current Density	10–12 A/cm² (typical, electrographite group)
Max Surface Speed	≤50 m/s (typical, electrographite group)
Hardness	Not published (typical electrographite Shore 30–50)
Spring	Not included (brush-holder supplied)
Application	EMD D12 / D15 / D22 main generators
Compatible Brand	EMD (Electro-Motive Division) locomotives

Compatible Models

This EMD 8209085 Carbon Brush is designed as a direct replacement for the following machine models and series:

EMD 8209085 (OEM part number) EMD 9334438 (cross-reference) EMD 8307806 (cross-reference) DE8 grade (supplier designation BroadCarbon) EMD D12 / D15 / D22 main generator applications

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Description

This EMD 8209085 carbon brush is a direct replacement for the DC main-generator brush positions on EMD D12, D15 and D22 main generators. The electrographite wafer (supplier grade DE8) provides stable current collection, medium contact drop and even wear under the high-current, high-vibration conditions of locomotive main-generator service. The brush is supplied with an insulated flexible copper-braid shunt lead for a clean, safe connection to the generator terminal.

Features & benefits:

OEM-matched dimensions — 15.8 × 33.3 × 66.6 mm wafer, drop-in fit for EMD D12/D15/D22 main-generator brush holders.
Electrographite material, grade DE8 — low electrical loss, medium contact drop, low-to-medium friction; suited to continuous high-current generator duty.
Insulated shunt lead — flexible copper-braid lead with insulation for safe, stable bolted connection.
Cross-referenced part numbers — EMD 8209085, EMD 9334438, EMD 8307806.
Typical applications — EMD D12 / D15 / D22 main generators, locomotive electrical systems.
Quality-inspected before dispatch: wafer dimensional check, lead crimp integrity, and surface condition per batch.