🔩 Differential Coupling – TATA 4018, 2518 / L/L 4923, 4921 (Serated, 71 mm Oil Seal)
📌 Applications
TATA Trucks: 4018, 2518 series
Leyland L/L Trucks: 4923, 4921 series
This part is used to connect the propeller shaft to the differential input flange, allowing torque transfer while maintaining proper lubrication and alignment of the driveline.
⚙️ Key Features
Serrated / Splined Surface:
The contact face has serrations or splines, ensuring positive mechanical engagement between the coupling and the differential flange.
Reduces backlash and prevents slip under high torque loads.
Oil Seal:
Designed for a 71 mm diameter oil seal, which keeps the differential lubricant contained and prevents contamination.
Material:
Made of hardened alloy steel, providing high strength and wear resistance.
OEM Compatibility:
Bolt pattern, spline count, and diameter match the TATA 4018/2518 and L/L 4923/4921 specifications for proper fitment.
🛠️ Function
Torque Transmission: Transfers power from the propeller shaft to the differential.
Positive Engagement: Serrated teeth prevent rotation slip and maintain alignment under load.
Sealing & Lubrication: Works with the 71 mm oil seal to retain differential oil and protect bearings.
Durability: Designed for heavy-duty trucks to handle high torque and shock loads.
🔹 Driveline Placement
Gearbox Output → Propeller Shaft → Differential Coupling (Serated + 71mm Oil Seal) → Differential Input → Axles → Wheels
The differential coupling is the critical link transmitting torque from