Power Transfer Unit Case Cleaning and Inspection
- Clean the power transfer unit case housing.
- The case halves, internal gears and bearings are not serviceable components. If damage is present, the power transfer unit must be replaced as an assembly.
- Inspect the power transfer unit case housing threaded bolt holes (1). Repair any damaged threads.
- Inspect the power transfer unit case housing sealing surfaces (2). Repair small scratches or nicks with a soft stone.
- Inspect the power transfer unit input shaft seal surface (3) for thread damage or sealing surface damage.
- Inspect the power transfer unit idler shaft tube seal surface (4) for thread damage or sealing surface damage.
- Inspect the power transfer unit drain plug hole (5) for thread damage or sealing surface damage.
- Inspect the power transfer unit rear output shaft and splines (6) for damage or excessive wear.
- Inspect the rear output shaft for end play. If end play is present, replace the power transfer unit as an assembly.
- Rotate the shaft by hand. The shaft should rotate freely with no roughness felt within the bearings. If roughness within bearings is present, replace the power transfer unit as an assembly.
Clean the power transfer unit extension housing in cleaning solvent and air dry.
- The power transfer unit case assembly must be replaced if damage is present.
- Inspect the power transfer unit extension housing (1) for excessive wear, cracks, or damage.
- Inspect the power transfer unit case extension housing sealing surfaces (2). Repair small scratches or nicks with a soft stone.
- Inspect the idler gear shaft tube o-ring sealing surface (3).
- Inspect the power transfer unit case fill plug hole (4) for thread damage or sealing surface damage.
-
Courtesy of GENERAL MOTORS COMPANY
Clean the power transfer unit input shaft in cleaning solvent and air dry.
- The case halves, internal gears and bearings are not serviceable components. If damage is present, the power transfer unit must be replaced as an assembly.
- Inspect the power transfer unit input shaft splines (1) for excessive wear, cracks, or damage.
- Inspect the power transfer unit input shaft front seal surface (2) for pitting, excessive wear, or damage.
- Inspect the power transfer unit input shaft gear teeth (3) for excessive wear or damage.
- Inspect the power transfer unit input shaft - intermediate drive shaft seal surface (4) for excessive wear or damage.
- Inspect the power transfer unit rear input shaft bearing (5) for excessive wear or damage.
- Inspect the power transfer unit front input shaft bearing (6) for excessive wear or damage.
Clean the power transfer unit idler shaft in cleaning solvent and air dry.
- The case halves, internal gears and bearings are not serviceable components. If damage is present, the transfer case assembly must be replaced.
- Inspect the power transfer unit front idler shaft bearing (1) for excessive wear or damage.
- Inspect the power transfer unit idler shaft gear teeth (2) for excessive wear or damage.
- Inspect the power transfer unit rear idler shaft bearing (3) for excessive wear or damage.
Clean the power transfer unit idler shaft tube in cleaning solvent and air dry.
- Inspect the power transfer unit front idler gear shaft tube o-ring (1).
- Inspect the power transfer unit idler shaft tube (2) for excessive wear or damage.
- Inspect the power transfer unit rear gear shaft tube o-ring (3).
NOTE:
The power transfer unit case assembly must be replaced if damage is present.