Guangzhou Meishun Automatic Transmission Co., Ltd.
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Typical Faults:
Spline Wear at Shaft-Drum Interface
Symptom: Delayed forward engagement (P0776 codes)
Cause: Micro-movement from torque reversals
Drum Warpage
Symptom: Harsh 1-2 shifts or clutch drag
Trigger: Overheating (>300°F) distorts sealing surface
Piston Seal Extrusion
Symptom: Pressure loss in forward gears only
Root Cause: Contaminated ATF degrading seal material
Critical Measurements:
Shaft Runout: >0.05mm requires replacement
Drum-to-Piston Clearance: 0.10-0.15mm (use feeler gauge)
Seal Groove Wear: >0.2mm depth = rebuild
Pro Tip: Always replace shaft and drum as matched set – mismatched splines accelerate wear.
