6778691 Cage Allison spare parts

6778691 Cage Allison spare parts

The Allison 6778691 cage, as a core guiding and support component of Allison transmission bearings, is hailed as the “precision navigator” of bearing operation. Its core function is to precisely guide the smooth operation of the bearing rolling elements (balls/needle rollers), isolate the rolling elements and prevent mutual friction and collision, while transmitting loads, absorbing operating vibrations, reducing bearing operating noise, and preventing bearing wear and seizure caused by rolling element misalignment and jamming. This ensures the efficient and stable operation of the transmission bearing, thereby protecting the smooth power transmission of the transmission, extending the service life of the bearings and the entire transmission, and reducing maintenance costs and downtime losses.

Core technical parameters:

-Part Number: Allison 6778691
– Material specifications: High-quality carburized steel (welded type) or PA66+25% glass fiber reinforced composite material (injection molding type) are selected. The carburized steel material is carburized and quenched, with a tensile strength ≥1500MPa and Rockwell hardness controlled at HRC58-62.
– Structure type: The carburized steel material adopts a welded structure, while the PA66+25% glass fiber material adopts a precision injection molding process; it adopts an integrated pocket structure with a reserved precise rolling element slot, which is precision machined and chamfered; the cage adopts a lightweight design, optimizing the structure while ensuring strength and reducing bearing running resistance; the edges are rounded, and some models are equipped with a positioning structure to further improve installation accuracy.
– Dimensional parameters: inner diameter φ25-50mm, outer diameter φ45-80mm, width 12-28mm, number of rolling element slots 4-12, slot size error ≤0.01mm, dimensional tolerance controlled within GB/T 1804-2000 m level accuracy.
– Performance indicators: Temperature resistance range -40℃ to 180℃ (carburized steel material), -40℃ to 150℃ (PA66+25% glass fiber material); oil resistance grade meets GB/T 1226-2010 standard; PA66+25% glass fiber material shows no expansion or deformation after immersion for 72 hours, and no decrease in mechanical properties; fatigue life ≥1000 hours, meeting GB/T 24607-2009 life test standard; noise ≤52dB.
– Applicable Scenarios: Dedicated to Allison series transmission bearings, widely used in commercial vehicles, heavy trucks, construction machinery, mining equipment (such as the Allison transmissions in the Terex TR50/TR60 series), and other equipment equipped with Allison transmissions. Used for guiding and supporting transmission rolling bearings and needle roller bearings, undertaking the core tasks of guidance, isolation, wear reduction, and noise reduction. Can be used for original equipment manufacturer (OEM) parts replacement, transmission repair and maintenance. Adapted to complex working conditions such as heavy loads, high-frequency high-speed rotation, heavy oil contamination, high temperature and high pressure, etc., providing precise guiding support for stable operation of transmission bearings and contributing to efficient equipment operation.

Core product advantages:

1. Original factory precise fit: Strictly matches the original Allison 6778691 part number, directly installs in the original position, seamlessly connects the inner and outer rings of the bearing with the rolling elements, greatly improving maintenance efficiency.
2. High rigidity and fatigue resistance: Made of carburized steel welded or PA66+25% glass fiber reinforced material, combined with carburizing and quenching or precision injection molding process, it has high rigidity, good toughness, excellent fatigue resistance and wear resistance. The carburized steel material can withstand heavy impact, the PA66 material has dimensional stability, and the high-speed rotation performance of the carburized steel material is 10% better than traditional products. It can withstand high-frequency high-speed rotation and heavy load of bearings and is not easy to deform, break or wear.
3. Precise guidance and noise reduction: The optimized raceway arc convexity design stabilizes the rotational motion of the rolling elements, suppresses contact stress, and reduces operating noise by more than 8%, achieving quiet and stable operation; the precise pocket-type groove design firmly fixes the rolling elements, ensuring precise bearing transmission.
4. Oil-resistant, high-temperature resistant and durable: Both materials have excellent oil and high-temperature resistance, and can adapt to the complex working environment of gearboxes with a lot of oil and high temperature and pressure.
5. Lightweight and easy to install: It adopts a lightweight structural design; the one-piece molded structure and the slot is chamfered and burr-free, requiring no complicated tools. A single person can quickly complete the installation and disassembly; no additional debugging is required after installation, and subsequent maintenance is simple, greatly reducing maintenance time and costs.

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