BELL 47-620-680-1 Lower Helicopter Sun Gear Ball Bearing 47J2 1124899 G2U

( Brand: Bell ), ( Manufacturer Part Number: 47-620-680-1 ), ( Part Type: Bearing Sun Gear ), ( Warranty: 30 Day )

Review BELL Helicopter Lower Sun Gear Ball Bearing Pn 476206801 G2u

The 47-620-680-1 47J2 helicopter lower sun gear ball bearing, also referred to as part number 476206801 and cross reference number 1124899 G2U, is an essential component in the rotorhead assembly of various helicopter models. This high-precision bearing is designed to support the lower sun gear, which is an integral part of the main rotor transmission system.

This bearing boasts a size of 35.2 mm in diameter and 11.4 mm in width, with an inner diameter of 27.5 mm and an outer diameter of 35.2 mm. The roller diameter measures 5 mm, and each roller has a width of 1.6 mm, ensuring optimal contact with the gear teeth for efficient power transmission.

The 47J2 helicopter lower sun gear ball bearing is manufactured using top-grade steel alloys and heat-treated for enhanced durability and resistance to wear and tear. The roller bearings are precision-machined and arranged in pairs, with each pair being separated by a cage made of fiber material for proper spacing and alignment. The cages are designed to allow lubrication to flow freely between the bearings and the gears, ensuring smooth rotational motion and minimizing friction.

This particular bearing is a G2U type, which signifies that it has a tolerance class of IT7 and a surface finish of Ra 0.8 m. These stringent specifications are critical for maintaining precise gear alignment and minimizing runout, ensuring optimal helicopter performance and reliability.

Installing the 47J2 helicopter lower sun gear ball bearing involves careful alignment and proper assembly techniques. It is recommended to follow the manufacturer's instructions and guidelines for the specific helicopter model to ensure a successful installation and proper functioning of the bearing.

In summary, the 47-620-680-1 47J2 helicopter lower sun gear ball bearing is a crucial component in the helicopter's rotorhead assembly. Its precision manufacturing, high-quality materials, and stringent specifications make it an essential part in maintaining optimal helicopter performance and reliability.

Pros and Cons of Buying a Helicopter Lower Sun Gear Ball Bearing (47-620-680-1 47J2)

The helicopter lower sun gear ball bearing (47-620-680-1 47J2, 1124899 G2U) is an essential component of a helicopter's transmission system. It facilitates the smooth rotation of the sun gear, which in turn powers the main rotor. In this analysis, we will discuss the pros and cons of purchasing this part.

1. Enhanced Performance: A new lower sun gear ball bearing can significantly improve the helicopter's performance. This component is responsible for transmitting power from the engine to the rotor, so its deterioration can lead to reduced efficiency and increased vibration. A replacement bearing ensures a snug fit, reducing power loss and improving overall performance.

2. Increased Safety: A worn-out lower sun gear ball bearing can pose a safety risk. The bearing may fail, causing the rotor to stop suddenly or malfunction, potentially leading to accidents. By replacing the bearing, you can ensure the helicopter remains safe and reliable.

3. Extended Lifespan: Regular replacement of critical components like the lower sun gear ball bearing can help extend the helicopter's overall lifespan. Preventive maintenance is essential for keeping the helicopter in top condition and reducing the likelihood of unexpected failures.

1. Cost: Replacing a helicopter lower sun gear ball bearing can be a costly endeavor. The cost of the part itself can be quite high, and labor expenses can add to the total cost.

2. Downtime: Installing a new lower sun gear ball bearing requires the helicopter to be taken out of service for a significant amount of time. This downtime can be costly, especially for helicopter operators who rely on their aircraft for revenue generation.

3. Complexity: Installing the new bearing can be a complex process. It requires specialized tools and knowledge to ensure the bearing is installed correctly and securely.

In conclusion, while purchasing a helicopter lower sun gear ball bearing (47-620-680-1 47J2, 1124899 G2U) comes with some drawbacks, the benefits far outweigh the costs. Improved performance, increased safety, and extended lifespan make this a worthwhile investment for helicopter owners. However, it is essential to consider the costs involved, including the part's price, labor expenses, and downtime, before making a decision.

If you own a helicopter, it is recommended to regularly inspect your lower sun gear ball bearing and replace it when necessary. This preventive maintenance can save you from costly repairs or accidents caused by a worn-out bearing. When purchasing a new bearing, consider sourcing it from reputable suppliers to ensure its quality and compatibility with your helicopter model.

Details:

Bell 47J2 Helicopter Lower Sun Gear Ball Bearing PN 476206801 1124899.

part #: 476206801 prices

• $99.95-$434.25

specifications aviationpar:

• brand: Bell
• mpn: 47-620-680-1
• part type: Bearing Sun Gear
• warranty: 30 Day

seller aviationpar:

• rating: 97.5%
• # reviews: 55814
• city: Morristown, Tennessee

returns aviationpar:

• policy: No Returns

shipping aviationpar:

• carrier: USPS
• cost: $0.00
• type: Fixed
• service: USPS Ground Advantage
• transit: 10-13 Days
• class: Standard

offer aviationpar:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: May 29, 2026

payments aviationpar:

• other
• wallet: Apple-pay
• credit card: Diners-club

general aviationpar:

• Parts Accessories > Aviation Parts Accessories > Parts
• condition: Used

Bell 47-620-680-1 Is Similar To:

• 1-150-108-01 Bell Helicopter Oil Strainer (33.1% similar) Bell helicopter oil strainer adapter mfr part: 01NSN: this is a new surplus...(April 5th, 2017)
• 100-079-8 Bell Helicopter Textron Li (34.4% similar) Tube reducer is in excellent condition as shown pictures. Specification:thread class 3a all ends reducer type concentric connection flared tube ends connection threaded external 1ST end bulkhead connection 2ND end nominal thread size. 562 inches 2ND end nominal thread size. Set of 2 Bell reducer ...(September 22nd, 2017)
• 204-001-042-1 Bell Helicopter Huey Cylinder Assembly Count New (31.1% similar) Lock: U2431C15OZ. Bell 204 UH-1 Huey cylinder assembly 1 count new...(January 15th, 2019)
• 204-001-102-1 Bell Helicopter Huey Support Count New (33.3% similar) Bell 204 UH-1 Huey support 1 count new. Lock: U2429D5OZ...(January 16th, 2019)
• 204-001-334-3 Bell Helicopter Huey Control Stick New (33.3% similar) Lock: L18D2LB 2OZ. Bell 204 UH-1 Huey bracket 1 count new. This unit is new in great condition, the thumb knob at top broken see pics...(February 14th, 2019)
• 204-001-702-1 Bell Helicopter Huey Rudder Pedal Control Count Used (32.9% similar) Good condition see pics, unit sold as is. Lock: L18D1 lb 7OZ. Bell 204 UH-1 Huey control 1 count used...(February 20th, 2019)
• 204-001-724-5 Bell Helicopter Huey Link Assembly Count New (33.3% similar) Lock: U2430B7OZ. Bell 204 UH-1 Huey link assembly 1 count new...(January 15th, 2019)
• 204-001-771-1 Bell Helicopter Huey Gear Count New (35.6% similar) Lock: U2431B3OZ. Bell 204 UH-1 Huey gear 1 count new...(January 18th, 2019)
• 204-001-778-3 Bell Helicopter Huey Bracket Count New (33.3% similar) Lock: U2431A4OZ. Bell 204 UH-1 Huey bracket 1 count new...(January 15th, 2019)
• 204-001-945-1 Bell Helicopter Huey Aluminum Support Count New (31.3% similar) Lock: B18-04017OZ. Bell 204 UH-1 Huey aluminum support 1 count new...(February 19th, 2019)
• 204-010-133-9 Bell Helicopter Huey Bolt Count New (34.1% similar) Bell 204 UH-1 Huey bolt 1 count new. Lock: U2432B4LB 5OZ...(January 17th, 2019)