Brand Name:
Toyota
Model Number:
U760E;U760F;U761E;U761F
Function: Final torque multiplication stage in planetary transmissions, typically controlling overdrive/reverse gear ratios.
Key Components:
Sun Gear: Hardened steel core with ground teeth (HRC 60+)
Planet Carrier: Precision-machined with needle bearing pockets
Ring Gear: Often integrated into transmission case
Failure Modes:
Sun Gear Spline Wear: Causes ratio slippage (P0730-P0733 codes)
Pinion Bearing Failure: Results in gear whine (check endplay <0.2mm)
Carrier Cracks: Stress fractures near thrust surfaces
Critical Measurements:
Sun-to-pinion backlash: 0.08-0.15mm
Axial play: <0.25mm (adjust via selective washers)
Pro Tip: Always replace planetary sets as complete assemblies – mixed components alter load distribution.
(Covers fundamental planetary mechanics and rebuild protocols.)
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