Guangzhou Meishun Automatic Transmission Co., Ltd.
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Function: Generates hydraulic pressure (85-120 psi) for clutch engagement, lubrication, and valve body operation via torque converter drive.
Key Features:
Gerotor Design: High-precision inner/outer rotor set (OEM 68163845AA) with hardened steel construction.
Critical Specs: Rotor-to-housing clearance <0.08mm; relief valve opens at 130±5 psi.
Failure Modes:
Rotor Scoring: Contaminated ATF+4 fluid (metal debris → P0841/P0868 codes).
Seal Degradation: Causes pressure loss (delayed shifts, especially 2-3 upshift).
Cavitation Damage: Aerated fluid from clogged filter (whining noise at idle).
Pro Tip: Prime pump with ATF+4 before installation – dry starts cause instant rotor galling.
