29551651 housing assy.-retarder Allison spare parts

29551651 housing assy.-retarder Allison spare parts

The Allison 29551651 housing assy.-retarder is a core load-bearing and sealing component of the Allison automatic transmission hydraulic retarding system. It is designed for heavy-duty transmissions such as the 3000/4000 series, HD/B500, 4000RDS, and T400. It integrates stator mounting, oil chamber sealing, heat dissipation, and pipeline interface functions to ensure stable operation of the retarder under high-load braking conditions. It is a key replacement component for auxiliary braking systems in commercial vehicles, engineering equipment, and mining vehicles.
This product is made of high-strength ductile iron precision casting, which makes it rigid, impact-resistant, and vibration-resistant. The internal oil chamber and blade groove are precision machined and honed by CNC. Combined with the original factory-grade sealing structure, it ensures that the retarder is leak-free and has stable pressure during operation, efficiently transmits hydraulic braking torque, significantly reduces wear on the main braking system, and extends brake life. Allison Transmission.

Core technical parameters:

-Part Number: 29551651
-Product Name: housing assy.-retarder
– Compatible models: Allison 3000/4000 series, HD/B500, 4000RDS, T400, MD3060, HD4060, etc.
-Main material: QT450-10 ductile iron (high strength, high toughness)
-Internal structure: Integrated stator mounting cavity + hydraulic brake oil chamber
– Sealing method: Original O-ring + end face sealing groove (leak-proof)
– Interface specification: Standard transmission oil passage interface (compatible with original equipment manufacturer (OEM) piping)
– Working pressure: 1.0–1.5 MPa (retarder working oil pressure)
-Operating temperature: -40℃～180℃ (suitable for heavy-load continuous braking)
– Installation method: Direct mounting to the original location at the rear of the gearbox (no modification required)
– Surface treatment: anti-rust primer + high-temperature topcoat, oil-resistant and corrosion-resistant.
– Precision Standard: OEM original factory tolerances, precise stator/rotor fit clearance
-Service life: ≥12000 working hours (heavy load conditions)

Product advantages:

– Original factory matching: 1:1 replica of Allison design, precise installation alignment, and complete compatibility of seals and oil lines.
– High-strength structure: Made of ductile iron, impact-resistant and fatigue-resistant, suitable for harsh working conditions such as mining and engineering.
– Reliable sealing: Precision-machined sealing grooves + original factory seals eliminate retarder oil leakage and pressure loss malfunctions.
– Heat dissipation optimization: The housing features integrated heat dissipation fins, which, combined with transmission fluid circulation, quickly remove brake heat from the Allison Transmission system.
– Easy maintenance: Original part replacement reduces maintenance time and quickly restores retarder braking performance.
– Wide range of applications: Compatible with heavy trucks, buses, concrete mixer trucks, mining dump trucks, oilfield equipment, etc.

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