Rancilio EGRO 55 Series Technical Manual page 102

6.7 BREW GROUP REBUILD GUIDE
4. DISASSEMBLE AND CLEAN THE UPPER PISTON ASSEMBLY (UPA)
4.1
4.1 Place the BGA your work area and remove the Upper Piston Assembly (UPA) by loosening the two cotter pins, and
gently pulling the sides of the BGA housing apart and pulling upward on the UPA.
TOOL: 3mm Allen wrench
4.2 Remove the grounds puck sweeper arm from the UPA by gently pulling on both sides, releasing it from the UPA.
4.3 Remove upper piston from UPA by turning it up the auger shaft using a 3mm Allen wrench inserted into the gear
box (bottom mounting plate) of the UPA
TOOL: 3mm Allen wrench
4.4
4.4 Remove the shower screen and the stainless steel upper piston plate by unscrewing the screw on the end of the piston.
Clean parts using a clean towel and water solution and dry throughly when clean
TOOL: Screwdriver
4.5 Remove piston guide arms
TOOL: 3mm Allen wrench
TIP: Watch for brass pins that are located inside the piston shaft. They will become loose when you re
move the piston guide arms.
4.6 Remove piston shaft from piston head
TOOL: 3mm Allen wrench
4.2
4.5
- Section 6: Page 29 -
EGRO 55 SERIES TECHNICAL MANUAL
4.3
4.6