Description
287479-G – DD-3 BRAKE ACTUATOR (LH)
PART NUMBER(S):
Fleet Products: 287479-G (New) | OE: 287479X, 4R-5-1, K287479
DESCRIPTION:
Model: DD-3 Safety Actuator – Left Hand
Vehicles: Motor Coach Industries (MCI)
• Chamber Type: Type 30, double 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): 0°
• Yoke Pin to Plate (C): 3.88 in
• Stud End to Plate (E): 12.69 in
• Yoke Orientation (L): 315°
• Mounting Stud Clocking (M): 270°
• Non-Pressure Plate Port Clocking (N): 90°
Applications: Designed for MCI bus applications requiring a left-hand, short rod DD-3 safety actuator. This chamber delivers consistent service, emergency, and parking brake performance, maintaining mechanical hold even during air system failure.
CROSS-REFERENCE(S):
287479X, 4R-5-1, K287479, 4R-5-1CGRMA 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 orientation and short rod configuration before install
✔ Apply BW 204-M barium-based lubricant in shaft cavity during service or rebuild
✔ Push rod must align to slack adjuster at a 90°+ angle to avoid drag
✔ Lock port must receive ~70 psi to release mechanical parking brake hold
✔ Clamping ring bolts must be tightened evenly to ensure diaphragm seal integrity
✔ Mounting studs and yoke clocking must align per OEM specs for proper fit
✔ New unit – no core return required
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Warranty Information
