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Home >> GMC >> 2007 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 892 (Automatic Transmission - 4L80-E/4L85-E - Introduction (2 Of 2)) >> Repair Instructions >> Repair Instructions - Off Vehicle >> Transmission Oil Pump Body Disassemble

Transmission Oil Pump Body Disassemble

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Locating Oil Pump Body Assembly Gear Pockets, Crescent, Pump Body Face & Bushing Inspection Areas
    GM181746Courtesy of GENERAL MOTORS CORP.
  1. Remove the transmission oil pump drive gear (205) and driven gear (204) from the oil pump body (203).
  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. Fig 2: Inspection Areas Of Oil Pump Body Assembly
    GM31203Courtesy of GENERAL MOTORS CORP.
  4. Remove the transmission oil pump seal (5) from the oil pump body assembly (203).
  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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