Automatic Transmission Servicing - Except Allison: Overhaul GMC Yukon Denali

ACCUMULATOR ASSEMBLY (4L80-E)

Note. Tools required: Guide Pin (J-25025-5).

Disassembly

1. Remove the following parts: 4th apply piston. Servo return spring. Retainer ring. Washer. Spring. 2nd apply piston pin. (Схема №98)and (Схема №99).
2. Install the piston remover to compress the 2nd apply piston. Remove the 2nd apply piston retaining ring. Remove the servo cushion spring retainer and the servo cushion spring. Remove the seals from the cover, the housing and the pistons. (Схема №100)and (Схема №101).
3. Check the case servo bore for damage and sharp edges. Clean all the parts using solvent. Air dry all the parts.
4. Inspect the pistons for porosity and damage. Inspect the seal grooves for damage. Inspect the cover for porosity and damage. Inspect for nicks, cuts and binding in the seal grooves.
5. If damage is found, check for the cause of the damage. Inspect the springs for kinks and bending. Inspect the pin for wear and burrs.