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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4L80-E/4L85-E - Overhaul >> Repair Instructions >> Transmission Oil Pump Body Disassemble

Transmission Oil Pump Body Disassemble

  1. Remove the transmission oil pump drive gear (205) and driven gear (204) from the oil pump body (203).
    Fig 1: Identifying Oil Pump Components
    GM181746Courtesy of GENERAL MOTORS CORP.
  2. Inspect the oil pump body assembly (203) gear pockets, crescent, pump body face and bushing for scoring nicks and wear.
  3. Inspect the oil pump drive gear (205) and driven gear (204) for wear.
  4. Remove the transmission oil pump seal (5) from the oil pump body assembly (203).
    Fig 2: View Of Oil Pump Body Assembly & Oil Pump Seal
    GM31203Courtesy of GENERAL MOTORS CORP.
  5. Inspect the oil pump body assembly (203) fluid passages for debris.
  6. Inspect the oil pump body assembly fluid passages for scored or irregular mating surfaces.
  7. Inspect the oil pump body assembly fluid passages for cross channel leaks.
  8. Inspect the oil pump body assembly bolt threads for damage.
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