6777908 Piston, Rotating Clutch Allison spare parts

6777908 Piston, Rotating Clutch Allison spare parts

The Allison 6777908 rotary clutch piston is precisely matched to the Allison 1000/2000/3000/4000 series heavy-duty automatic transmissions, compatible with heavy-duty commercial vehicles, mining wide-body trucks, engineering dump trucks, and long-haul tractors from brands such as Mercedes-Benz, DAF, Peterbilt, and Volvo equipped with Allison transmissions. As the core hydraulic actuator of the rotary clutch, it rotates synchronously with the rotary clutch, directly interacting with the rotary clutch friction plates, pressure plate, hydraulic circuit, and TCM control unit. During clutch engagement, it quickly responds to hydraulic commands, pushing the friction plates to engage and transmit power; during disengagement, it smoothly returns to its original position, avoiding jerking and uneven wear. It is especially suitable for demanding operating conditions involving heavy loads, high-frequency rotation, and frequent clutch actuation. With original factory design dimensions and zero deviation from the sealing groove, it is the preferred original factory replacement part for rotary clutch repair and fault replacement in transmissions.

Core technical parameters

–Model: 6777908
– Product Name: Piston Rotating Clutch
– Operating temperature: -40°C to +150°C (short-term peak 160°C)
– Product weight: 0.65 kg
– Product Type: Original factory-grade precision-machined rotary clutch piston, single-piece assembly
– Compatible Systems: Allison 1000/2000/3000/4000 series heavy-duty automatic transmissions; compatible with rotary clutch systems for heavy-duty commercial vehicles, mining trucks, engineering vehicles, and municipal vehicles. It can precisely link with Allison original rotary clutch friction plates, steel plates, seals, hydraulic valve groups, and TCM control units to achieve smooth engagement and disengagement of the clutch in a rotating state.
– Suitable operating conditions: long-distance heavy-load high-speed cruising, frequent clutch operation in mountainous areas, high-load operation in mining areas, and high-frequency gear shifting on urban expressways; can work stably in harsh environments such as high temperature (transmission oil temperature 120°C), low temperature (-40°C), high speed, high hydraulic pressure, and high-frequency reciprocating motion.

Product Advantages

1. Precise original factory fit, saving repair time: 100% matching Allison 6777908 original factory specifications, with zero error in size, sealing groove and positioning hole; can be replaced individually without disassembling the gearbox assembly, greatly reducing repair time and costs.
2. High-strength material, reliable sealing: 6061-T6 aluminum alloy forging + anodizing treatment, high compressive strength, light weight, suitable for rotating conditions; precision-machined sealing groove and high-quality sealing ring, hydraulic leakage rate is close to zero, can withstand high pressure hydraulic impact and rotational friction for a long time, and the service life is more than 1.8 times that of ordinary pistons.
3. Rotational adaptation and precise action: The guide surface is precision machined to ensure seamless rotational operation, the piston reciprocating motion is free from deviation and jamming, the response to hydraulic commands is rapid, and the engagement and disengagement of the rotary clutch is smooth and without jerking; effectively avoiding uneven wear of friction plates and clutch slippage, improving power transmission efficiency, and reducing gearbox oil consumption and component wear.

Get a personalized quote now