Description
287479X – DD-3 BRAKE ACTUATOR (LH)
PART NUMBER(S):
Fleet Products: 287479X (Remanufactured) | OE: 287479, 4R-5-1CGRM, K287479
DESCRIPTION:
Model: DD-3 Safety Actuator – Left Hand
Vehicles: Motor Coach Industries (MCI)
• Chamber Type: Type 30, dual diaphragm with mechanical push rod locking system
• Configuration: Horizontal mount, left-hand, short rod
• Dimensional Specs:
• Rod End to Non-Pressure Plate (A): 2.66 in
• Push Rod Clocking (B): 180°
• Yoke Pin to Plate (C): 3.88 in
• Stud End to Plate (E): 1.25 in
• Yoke Orientation (L): 225°
• Mounting Stud Clocking (M): 270°
• Non-Pressure Plate Port Clocking (N): 90°
Applications: This remanufactured left-hand DD-3 actuator is engineered for MCI coaches and other heavy-duty transit vehicles that require secure mechanical park brake retention. Suitable for fleet maintenance and replacement of OEM-grade short rod LH chambers.
CROSS-REFERENCE(S):
287479, 4R-5-1CGRM, 287479X
A cross-reference listing means this part is a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ Confirm left-hand horizontal mounting and short rod configuration before installation
✔ Use BW 204-M barium lubricant inside shaft cavity during assembly or rebuild
✔ Connect lock port properly to enable mechanical push rod hold function
✔ Push rod must align to slack adjuster at ≥90° for optimal brake performance
✔ Clamping ring bolts must be torqued evenly to 15–25 ft-lbs to prevent diaphragm leaks
✔ Ensure yoke and mounting clocking match OEM alignment
✔ Remanufactured unit – core return required
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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Warranty Information
