Komatsu / Joy Global Main-House Blower Damper Assembly
Available is one Komatsu / Joy Global main-house blower damper assembly, P/N R64921D1. A Joy Global quote dated August 27, 2024 identifies the item as a Damper Assy, Main House Blower. A related maintenance record uses the functional description left analog damper control for the same Komatsu part number in an electrical-system work order. Together, these records support offering the equipment as a complete motorized damper assembly for a main-house blower/ventilation application.
Description
Available is one Komatsu / Joy Global main-house blower damper assembly, P/N R64921D1. A Joy Global quote dated August 27, 2024 identifies the item as a Damper Assy, Main House Blower. A related maintenance record uses the functional description left analog damper control for the same Komatsu part number in an electrical-system work order. Together, these records support offering the equipment as a complete motorized damper assembly for a main-house blower/ventilation application—not as a standalone electric motor or generic loose actuator.
Important: The assembly is offered as a complete Komatsu P/N R64921D1 package. The Belimo and Honeywell nameplates identify visible components of the package; they do not supersede the Komatsu part number or establish the complete bill of materials.
Visible Actuator Components
| Component | Verified identification | Visible / documented specifications |
| Belimo actuator | Product 386557 / EFX120-SR N4 | 270 in-lb / 30 Nm; spring return; AC 100–240 V; 2–10 V modulating control; NEMA 4 / IP66 enclosure indicated. |
| Honeywell actuator | MS4120F1204 | Two-position, spring-return direct-coupled actuator; 175 lb-in / 20 Nm; 120 VAC, 60 Hz; 0.35 A / 35 W; two auxiliary switches; IP54 / NEMA 2 marking. |
The Belimo actuator label is dated 2025-02-20. The visible Honeywell and Belimo hardware should be treated as installed components of the packaged assembly; buyers should inspect all equipment to confirm model, condition, wiring, and suitability for their intended service.
Application Reference
| Reference | Supporting information |
| Komatsu / Joy Global quote | R64921D1 documented as Damper Assy, Main House Blower |
| Related maintenance record | R64921D1 referenced for replacement of a left analog damper-control component within an electrical system |
| Typical use | Controlled ventilation / airflow service associated with a main-house blower system |
The documentation supports a mining-equipment main-house blower application, but it does not establish an exact machine model or cross-platform interchangeability. The buyer is responsible for confirming fitment.