DG4770.C3 Open C3 Clearance Auto Transmission Deep Groove Bearing

DG4770.C3 non-standard single-row open deep groove ball bearing, dimension 47mm inner bore × 70mm outer diameter × 12mm width, fully interchangeable with original Koyo/JTEKT DG4770C3 transmission bearing. Open design without rubber seals, equipped with stamped low-carbon steel cage, marked C3 large radial clearance to compensate thermal expansion under continuous high-speed operation. It bears radial load and slight bidirectional axial load, maintains stable low-noise rotation under long-term variable-speed vibration inside transmission housing. Manufactured with fully quenched high-purity GCr15 chrome bearing steel and strict dimensional tolerance, fully compatible with OEM DG4770.C3 assembly requirements. Complete formal quotation will be provided within 24 hours upon inquiry.

• Open structure allows full circulation of gearbox transmission oil, outstanding heat dissipation, eliminates rubber seal aging, swelling and leakage risks under long-time high-temperature oil soaking
• C3 enlarged radial clearance reserves expansion space for high-speed, high-temperature working conditions, effectively avoid bearing jamming and overheating failure after temperature rise
• Superfinished deep groove raceway reduces rolling friction coefficient, stable continuous rotation under frequent gear shift and variable-speed impact
• Uniform high-hardness GCr15 raw steel delivers outstanding wear resistance and anti-fatigue performance, greatly extend automobile transmission service cycle
• OEM unified matching overall dimension, direct replacement without modifying gearbox housing, shaft and assembly accessories
• Lightweight stamped steel cage lowers rotation inertia, perfectly fits medium-high speed continuous working conditions of vehicle transmissions
• Standard P0 precision grade, stable mass production supply, cost-effective for aftermarket repair and bulk wholesale orders

Passenger car automatic gearbox differential shafts, high-speed transmission intermediate shafts, light commercial vehicle reducers, small high-speed agricultural machinery transmission components.

25+ years professional manufacturer of DG series non-standard automotive gearbox bearings. All finished bearings pass high-speed continuous rotation test, shock load test and long-cycle fatigue durability test before delivery. Support customized anti-rust surface coating and special high-temperature anti-wear gearbox lubricant filling service. One-on-one professional installation technical guidance and formal detailed quotation within 24h for all RFQs. Stable mass production capacity supports long-term bulk aftermarket and OEM orders, factory direct selling price, stable consistent quality and punctual batch delivery.

• Raw GCr15 steel hardness & chemical composition incoming inspection
• High-precision raceway superfinishing roughness detection
• C3 clearance full batch sorting inspection
• Open bearing gear oil circulation high-temperature aging durability test
• Continuous vibration load rotation fatigue life cycle test
• 100% visual appearance marking check before packaging
• Random sampling high-speed performance test before shipment
• All DG4770.C3 bearings pass multi-process strict factory inspection.

Send bulk inquiry for DG4770.C3 open C3 clearance transmission bearings and obtain the following full support:

1. Complete formal detailed quotation within 24 hours
2. Standard dimension drawings & press-fit installation operation guidance
3. Custom anti-rust surface treatment and special transmission lubricant filling service
4. Exclusive long-term bulk factory wholesale price without intermediate markup

Large-volume OEM cooperation is welcome anytime.

Q1: What does suffix C3 mean on DG4770.C3?
A1: C3 represents enlarged radial clearance, designed for high-speed and high-temperature transmission working environment, to offset thermal expansion and prevent bearing seizure.
Q2: Difference between open DG4770.C3 and rubber sealed bearings?
A1: Open structure has no rubber sealing parts, relies on internal gearbox circulating oil for lubrication and heat dissipation, installed inside transmission housing; rubber sealed bearings are used for external exposed dusty shafts with grease lubrication.
Q3: Can DG4770.C3 replace original Koyo OEM bearings directly?
A3: Yes, inner bore, outer diameter, width and C3 clearance specifications are fully consistent, no modification to gearbox components required during replacement.